item.cc 260 KB
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/*
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   Copyright (c) 2000, 2012, Oracle and/or its affiliates.
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   Copyright (c) 2010, 2013, Monty Program Ab
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
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#ifdef USE_PRAGMA_IMPLEMENTATION
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#pragma implementation				// gcc: Class implementation
#endif
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#include "my_global.h"                          /* NO_EMBEDDED_ACCESS_CHECKS */
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#include "sql_priv.h"
#include "unireg.h"                    // REQUIRED: for other includes
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#include <mysql.h>
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#include <m_ctype.h>
#include "my_dir.h"
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#include "sp_rcontext.h"
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#include "sp_head.h"
#include "sql_trigger.h"
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#include "sql_select.h"
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#include "sql_show.h"                           // append_identifier
#include "sql_view.h"                           // VIEW_ANY_SQL
#include "sql_time.h"                  // str_to_datetime_with_warn,
                                       // make_truncated_value_warning
#include "sql_acl.h"                   // get_column_grant,
                                       // SELECT_ACL, UPDATE_ACL,
                                       // INSERT_ACL,
                                       // check_grant_column
#include "sql_base.h"                  // enum_resolution_type,
                                       // REPORT_EXCEPT_NOT_FOUND,
                                       // find_item_in_list,
                                       // RESOLVED_AGAINST_ALIAS, ...
#include "log_event.h"                 // append_query_string
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#include "sql_expression_cache.h"
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const String my_null_string("NULL", 4, default_charset_info);

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static int save_field_in_field(Field *from, bool *null_value,
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                               Field *to, bool no_conversions);

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/**
  Compare two Items for List<Item>::add_unique()
*/

bool cmp_items(Item *a, Item *b)
{
  return a->eq(b, FALSE);
}

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/****************************************************************************/

/* Hybrid_type_traits {_real} */

void Hybrid_type_traits::fix_length_and_dec(Item *item, Item *arg) const
{
  item->decimals= NOT_FIXED_DEC;
  item->max_length= item->float_length(arg->decimals);
}

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static const Hybrid_type_traits real_traits_instance;
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const Hybrid_type_traits *Hybrid_type_traits::instance()
{
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  return &real_traits_instance;
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}


my_decimal *
Hybrid_type_traits::val_decimal(Hybrid_type *val, my_decimal *to) const
{
  double2my_decimal(E_DEC_FATAL_ERROR, val->real, val->dec_buf);
  return val->dec_buf;
}


String *
Hybrid_type_traits::val_str(Hybrid_type *val, String *to, uint8 decimals) const
{
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  to->set_real(val->real, decimals, &my_charset_bin);
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  return to;
}

/* Hybrid_type_traits_decimal */
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static const Hybrid_type_traits_decimal decimal_traits_instance;
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const Hybrid_type_traits_decimal *Hybrid_type_traits_decimal::instance()
{
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  return &decimal_traits_instance;
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}


void
Hybrid_type_traits_decimal::fix_length_and_dec(Item *item, Item *arg) const
{
  item->decimals= arg->decimals;
  item->max_length= min(arg->max_length + DECIMAL_LONGLONG_DIGITS,
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                        DECIMAL_MAX_STR_LENGTH);
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}


void Hybrid_type_traits_decimal::set_zero(Hybrid_type *val) const
{
  my_decimal_set_zero(&val->dec_buf[0]);
  val->used_dec_buf_no= 0;
}


void Hybrid_type_traits_decimal::add(Hybrid_type *val, Field *f) const
{
  my_decimal_add(E_DEC_FATAL_ERROR,
                 &val->dec_buf[val->used_dec_buf_no ^ 1],
                 &val->dec_buf[val->used_dec_buf_no],
                 f->val_decimal(&val->dec_buf[2]));
  val->used_dec_buf_no^= 1;
}


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/**
  @todo
  what is '4' for scale?
*/
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void Hybrid_type_traits_decimal::div(Hybrid_type *val, ulonglong u) const
{
  int2my_decimal(E_DEC_FATAL_ERROR, u, TRUE, &val->dec_buf[2]);
  /* XXX: what is '4' for scale? */
  my_decimal_div(E_DEC_FATAL_ERROR,
                 &val->dec_buf[val->used_dec_buf_no ^ 1],
                 &val->dec_buf[val->used_dec_buf_no],
                 &val->dec_buf[2], 4);
  val->used_dec_buf_no^= 1;
}


longlong
Hybrid_type_traits_decimal::val_int(Hybrid_type *val, bool unsigned_flag) const
{
  longlong result;
  my_decimal2int(E_DEC_FATAL_ERROR, &val->dec_buf[val->used_dec_buf_no],
                 unsigned_flag, &result);
  return result;
}


double
Hybrid_type_traits_decimal::val_real(Hybrid_type *val) const
{
  my_decimal2double(E_DEC_FATAL_ERROR, &val->dec_buf[val->used_dec_buf_no],
                    &val->real);
  return val->real;
}


String *
Hybrid_type_traits_decimal::val_str(Hybrid_type *val, String *to,
                                    uint8 decimals) const
{
  my_decimal_round(E_DEC_FATAL_ERROR, &val->dec_buf[val->used_dec_buf_no],
                   decimals, FALSE, &val->dec_buf[2]);
  my_decimal2string(E_DEC_FATAL_ERROR, &val->dec_buf[2], 0, 0, 0, to);
  return to;
}

/* Hybrid_type_traits_integer */
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static const Hybrid_type_traits_integer integer_traits_instance;
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const Hybrid_type_traits_integer *Hybrid_type_traits_integer::instance()
{
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  return &integer_traits_instance;
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}

void
Hybrid_type_traits_integer::fix_length_and_dec(Item *item, Item *arg) const
{
  item->decimals= 0;
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  item->max_length= MY_INT64_NUM_DECIMAL_DIGITS;
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  item->unsigned_flag= 0;
}

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/*****************************************************************************
** Item functions
*****************************************************************************/

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/**
  Init all special items.
*/
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void item_init(void)
{
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  item_func_sleep_init();
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  uuid_short_init();
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}

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/**
  @todo
    Make this functions class dependent
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*/
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bool Item::val_bool()
{
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  switch(result_type()) {
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  case INT_RESULT:
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    return val_int() != 0;
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  case DECIMAL_RESULT:
  {
    my_decimal decimal_value;
    my_decimal *val= val_decimal(&decimal_value);
    if (val)
      return !my_decimal_is_zero(val);
    return 0;
  }
  case REAL_RESULT:
  case STRING_RESULT:
    return val_real() != 0.0;
  case ROW_RESULT:
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  case TIME_RESULT:
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  case IMPOSSIBLE_RESULT:
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    DBUG_ASSERT(0);
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    return 0;                                   // Wrong (but safe)
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  }
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  return 0;                                   // Wrong (but safe)
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}


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/*
  For the items which don't have its own fast val_str_ascii()
  implementation we provide a generic slower version,
  which converts from the Item character set to ASCII.
  For better performance conversion happens only in 
  case of a "tricky" Item character set (e.g. UCS2).
  Normally conversion does not happen.
*/
String *Item::val_str_ascii(String *str)
{
  if (!(collation.collation->state & MY_CS_NONASCII))
    return val_str(str);
  
  DBUG_ASSERT(str != &str_value);
  
  uint errors;
  String *res= val_str(&str_value);
  if (!res)
    return 0;
  
  if ((null_value= str->copy(res->ptr(), res->length(),
                             collation.collation, &my_charset_latin1,
                             &errors)))
    return 0;
  
  return str;
}


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String *Item::val_string_from_real(String *str)
{
  double nr= val_real();
  if (null_value)
    return 0;					/* purecov: inspected */
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  str->set_real(nr,decimals, &my_charset_numeric);
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  return str;
}


String *Item::val_string_from_int(String *str)
{
  longlong nr= val_int();
  if (null_value)
    return 0;
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  str->set_int(nr, unsigned_flag, &my_charset_numeric);
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  return str;
}


String *Item::val_string_from_decimal(String *str)
{
  my_decimal dec_buf, *dec= val_decimal(&dec_buf);
  if (null_value)
    return 0;
  my_decimal_round(E_DEC_FATAL_ERROR, dec, decimals, FALSE, &dec_buf);
  my_decimal2string(E_DEC_FATAL_ERROR, &dec_buf, 0, 0, 0, str);
  return str;
}


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String *Item::val_string_from_date(String *str)
{
  MYSQL_TIME ltime;
  if (get_date(&ltime, TIME_FUZZY_DATE) ||
      str->alloc(MAX_DATE_STRING_REP_LENGTH))
  {
    null_value= 1;
    return (String *) 0;
  }
  str->length(my_TIME_to_str(&ltime, const_cast<char*>(str->ptr()), decimals));
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  str->set_charset(&my_charset_numeric);
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  return str;
}


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my_decimal *Item::val_decimal_from_real(my_decimal *decimal_value)
{
  double nr= val_real();
  if (null_value)
    return 0;
  double2my_decimal(E_DEC_FATAL_ERROR, nr, decimal_value);
  return (decimal_value);
}


my_decimal *Item::val_decimal_from_int(my_decimal *decimal_value)
{
  longlong nr= val_int();
  if (null_value)
    return 0;
  int2my_decimal(E_DEC_FATAL_ERROR, nr, unsigned_flag, decimal_value);
  return decimal_value;
}


my_decimal *Item::val_decimal_from_string(my_decimal *decimal_value)
{
  String *res;
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  if (!(res= val_str(&str_value)))
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    return 0;
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  if (str2my_decimal(E_DEC_FATAL_ERROR & ~E_DEC_BAD_NUM,
                     res->ptr(), res->length(), res->charset(),
                     decimal_value) & E_DEC_BAD_NUM)
  {
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    ErrConvString err(res);
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    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_TRUNCATED_WRONG_VALUE,
                        ER(ER_TRUNCATED_WRONG_VALUE), "DECIMAL",
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                        err.ptr());
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  }
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  return decimal_value;
}


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my_decimal *Item::val_decimal_from_date(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed == 1);
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  MYSQL_TIME ltime;
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  if (get_date(&ltime, TIME_FUZZY_DATE))
  {
    my_decimal_set_zero(decimal_value);
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    null_value= 1;                               // set NULL, stop processing
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    return 0;
  }
  return date2my_decimal(&ltime, decimal_value);
}


my_decimal *Item::val_decimal_from_time(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed == 1);
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  MYSQL_TIME ltime;
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  if (get_time(&ltime))
  {
    my_decimal_set_zero(decimal_value);
    return 0;
  }
  return date2my_decimal(&ltime, decimal_value);
}


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double Item::val_real_from_decimal()
{
  /* Note that fix_fields may not be called for Item_avg_field items */
  double result;
  my_decimal value_buff, *dec_val= val_decimal(&value_buff);
  if (null_value)
    return 0.0;
  my_decimal2double(E_DEC_FATAL_ERROR, dec_val, &result);
  return result;
}


longlong Item::val_int_from_decimal()
{
  /* Note that fix_fields may not be called for Item_avg_field items */
  longlong result;
  my_decimal value, *dec_val= val_decimal(&value);
  if (null_value)
    return 0;
  my_decimal2int(E_DEC_FATAL_ERROR, dec_val, unsigned_flag, &result);
  return result;
}

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int Item::save_time_in_field(Field *field)
{
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  MYSQL_TIME ltime;
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  if (get_time(&ltime))
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    return set_field_to_null_with_conversions(field, 0);
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  field->set_notnull();
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  return field->store_time_dec(&ltime, decimals);
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}


int Item::save_date_in_field(Field *field)
{
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  MYSQL_TIME ltime;
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  if (get_date(&ltime, TIME_FUZZY_DATE |
                       (current_thd->variables.sql_mode &
                          (MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE |
                             MODE_INVALID_DATES))))
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    return set_field_to_null_with_conversions(field, 0);
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  field->set_notnull();
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  return field->store_time_dec(&ltime, decimals);
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}

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/*
  Store the string value in field directly

  SYNOPSIS
    Item::save_str_value_in_field()
    field   a pointer to field where to store
    result  the pointer to the string value to be stored

  DESCRIPTION
    The method is used by Item_*::save_in_field implementations
    when we don't need to calculate the value to store
    See Item_string::save_in_field() implementation for example

  IMPLEMENTATION
    Check if the Item is null and stores the NULL or the
    result value in the field accordingly.

  RETURN
    Nonzero value if error
*/

int Item::save_str_value_in_field(Field *field, String *result)
{
  if (null_value)
    return set_field_to_null(field);
  field->set_notnull();
  return field->store(result->ptr(), result->length(),
		      collation.collation);
}


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Item::Item():
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  is_expensive_cache(-1), rsize(0), name(0), orig_name(0), name_length(0),
  fixed(0), is_autogenerated_name(TRUE),
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  collation(&my_charset_bin, DERIVATION_COERCIBLE)
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{
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  marker= 0;
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  maybe_null=null_value=with_sum_func=with_field=unsigned_flag=0;
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  in_rollup= 0;
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  decimals= 0; max_length= 0;
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  with_subselect= 0;
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  cmp_context= IMPOSSIBLE_RESULT;
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   /* Initially this item is not attached to any JOIN_TAB. */
  join_tab_idx= MAX_TABLES;
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  /* Put item in free list so that we can free all items at end */
  THD *thd= current_thd;
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  next= thd->free_list;
  thd->free_list= this;
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  /*
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    Item constructor can be called during execution other then SQL_COM
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    command => we should check thd->lex->current_select on zero (thd->lex
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    can be uninitialised)
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  */
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  if (thd->lex->current_select)
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  {
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    enum_parsing_place place= 
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      thd->lex->current_select->parsing_place;
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    if (place == SELECT_LIST ||
	place == IN_HAVING)
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      thd->lex->current_select->select_n_having_items++;
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  }
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}

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/**
  Constructor used by Item_field, Item_ref & aggregate (sum)
  functions.

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  Used for duplicating lists in processing queries with temporary
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  tables.
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*/
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Item::Item(THD *thd, Item *item):
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  join_tab_idx(item->join_tab_idx),
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  is_expensive_cache(-1),
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  rsize(0),
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  str_value(item->str_value),
  name(item->name),
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  orig_name(item->orig_name),
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  max_length(item->max_length),
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  name_length(item->name_length),
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  decimals(item->decimals),
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  marker(item->marker),
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  maybe_null(item->maybe_null),
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  in_rollup(item->in_rollup),
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  null_value(item->null_value),
  unsigned_flag(item->unsigned_flag),
  with_sum_func(item->with_sum_func),
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  with_field(item->with_field),
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  fixed(item->fixed),
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  is_autogenerated_name(item->is_autogenerated_name),
  with_subselect(item->with_subselect),
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  collation(item->collation),
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  cmp_context(item->cmp_context)
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{
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  next= thd->free_list;				// Put in free list
  thd->free_list= this;
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}

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uint Item::decimal_precision() const
{
  Item_result restype= result_type();

  if ((restype == DECIMAL_RESULT) || (restype == INT_RESULT))
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  {
    uint prec= 
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      my_decimal_length_to_precision(max_char_length(), decimals,
                                     unsigned_flag);
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    return min(prec, DECIMAL_MAX_PRECISION);
  }
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  return min(max_char_length(), DECIMAL_MAX_PRECISION);
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}


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void Item::print_item_w_name(String *str, enum_query_type query_type)
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{
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  print(str, query_type);

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  if (name)
  {
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    THD *thd= current_thd;
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    str->append(STRING_WITH_LEN(" AS "));
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    append_identifier(thd, str, name, (uint) strlen(name));
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  }
}


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void Item::print_value(String *str)
{
  char buff[MAX_FIELD_WIDTH];
  String *ptr, tmp(buff,sizeof(buff),str->charset());
  ptr= val_str(&tmp);
  if (!ptr)
    str->append("NULL");
  else
  {
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    switch (result_type()) {
    case STRING_RESULT:
      append_unescaped(str, ptr->ptr(), ptr->length());
      break;
    case DECIMAL_RESULT:
    case REAL_RESULT:
    case INT_RESULT:
      str->append(*ptr);
      break;
    case ROW_RESULT:
    case TIME_RESULT:
    case IMPOSSIBLE_RESULT:
      DBUG_ASSERT(0);
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    }
  }
}


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void Item::cleanup()
{
  DBUG_ENTER("Item::cleanup");
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  DBUG_PRINT("enter", ("this: %p", this));
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  fixed=0;
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  marker= 0;
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  join_tab_idx= MAX_TABLES;
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  if (orig_name)
    name= orig_name;
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  DBUG_VOID_RETURN;
}

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/**
  cleanup() item if it is 'fixed'.
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  @param arg   a dummy parameter, is not used here
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*/

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bool Item::cleanup_processor(uchar *arg)
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{
  if (fixed)
    cleanup();
  return FALSE;
}


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/**
  rename item (used for views, cleanup() return original name).
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  @param new_name	new name of item;
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*/

void Item::rename(char *new_name)
{
  /*
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    we can compare pointers to names here, because if name was not changed,
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    pointer will be same
  */
  if (!orig_name && new_name != name)
    orig_name= name;
  name= new_name;
}

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Item_result Item::cmp_type() const
{
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  switch (field_type()) {
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  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_NEWDECIMAL:
                           return DECIMAL_RESULT;
  case MYSQL_TYPE_TINY:
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_LONG:
  case MYSQL_TYPE_LONGLONG:
  case MYSQL_TYPE_INT24:
  case MYSQL_TYPE_YEAR:
  case MYSQL_TYPE_BIT:
                           return INT_RESULT;
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
                           return REAL_RESULT;
  case MYSQL_TYPE_NULL:
  case MYSQL_TYPE_VARCHAR:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
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  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
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  case MYSQL_TYPE_GEOMETRY:
                           return STRING_RESULT;
  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_NEWDATE:
                           return TIME_RESULT;
  };
  DBUG_ASSERT(0);
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  return IMPOSSIBLE_RESULT;
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}
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/**
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  Traverse item tree possibly transforming it (replacing items).
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  This function is designed to ease transformation of Item trees.
  Re-execution note: every such transformation is registered for
  rollback by THD::change_item_tree() and is rolled back at the end
  of execution by THD::rollback_item_tree_changes().
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  Therefore:
  - this function can not be used at prepared statement prepare
  (in particular, in fix_fields!), as only permanent
  transformation of Item trees are allowed at prepare.
  - the transformer function shall allocate new Items in execution
  memory root (thd->mem_root) and not anywhere else: allocated
  items will be gone in the end of execution.
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  If you don't need to transform an item tree, but only traverse
  it, please use Item::walk() instead.
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  @param transformer    functor that performs transformation of a subtree
  @param arg            opaque argument passed to the functor
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  @return
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    Returns pointer to the new subtree root.  THD::change_item_tree()
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    should be called for it if transformation took place, i.e. if a
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    pointer to newly allocated item is returned.
*/

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Item* Item::transform(Item_transformer transformer, uchar *arg)
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{
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  DBUG_ASSERT(!current_thd->stmt_arena->is_stmt_prepare());
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  return (this->*transformer)(arg);
}


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/**
  Create and set up an expression cache for this item

  @param thd             Thread handle
  @param depends_on      List of the expression parameters

  @details
  The function creates an expression cache for an item and its parameters
  specified by the 'depends_on' list. Then the expression cache is placed
  into a cache wrapper that is returned as the result of the function.

  @returns
  A pointer to created wrapper item if successful, NULL - otherwise
*/

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Item* Item::set_expr_cache(THD *thd)
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{
  DBUG_ENTER("Item::set_expr_cache");
  Item_cache_wrapper *wrapper;
  if ((wrapper= new Item_cache_wrapper(this)) &&
      !wrapper->fix_fields(thd, (Item**)&wrapper))
  {
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    if (wrapper->set_cache(thd))
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      DBUG_RETURN(NULL);
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    DBUG_RETURN(wrapper);
  }
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  DBUG_RETURN(NULL);
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}


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Item_ident::Item_ident(Name_resolution_context *context_arg,
                       const char *db_name_arg,const char *table_name_arg,
		       const char *field_name_arg)
  :orig_db_name(db_name_arg), orig_table_name(table_name_arg),
   orig_field_name(field_name_arg), context(context_arg),
   db_name(db_name_arg), table_name(table_name_arg),
   field_name(field_name_arg),
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   alias_name_used(FALSE), cached_field_index(NO_CACHED_FIELD_INDEX),
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   cached_table(0), depended_from(0), can_be_depended(TRUE)
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{
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  name = (char*) field_name_arg;
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}

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Item_ident::Item_ident(TABLE_LIST *view_arg, const char *field_name_arg)
  :orig_db_name(NullS), orig_table_name(view_arg->table_name),
   orig_field_name(field_name_arg), context(&view_arg->view->select_lex.context),
   db_name(NullS), table_name(view_arg->alias),
   field_name(field_name_arg),
   alias_name_used(FALSE), cached_field_index(NO_CACHED_FIELD_INDEX),
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   cached_table(NULL), depended_from(NULL), can_be_depended(TRUE)
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{
  name = (char*) field_name_arg;
}


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/**
  Constructor used by Item_field & Item_*_ref (see Item comment)
*/
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Item_ident::Item_ident(THD *thd, Item_ident *item)
  :Item(thd, item),
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   orig_db_name(item->orig_db_name),
   orig_table_name(item->orig_table_name), 
   orig_field_name(item->orig_field_name),
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   context(item->context),
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   db_name(item->db_name),
   table_name(item->table_name),
   field_name(item->field_name),
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   alias_name_used(item->alias_name_used),
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   cached_field_index(item->cached_field_index),
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   cached_table(item->cached_table),
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   depended_from(item->depended_from),
   can_be_depended(item->can_be_depended)
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{}
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void Item_ident::cleanup()
{
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  DBUG_ENTER("Item_ident::cleanup");
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#ifdef CANT_BE_USED_AS_MEMORY_IS_FREED
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		       db_name ? db_name : "(null)",
                       orig_db_name ? orig_db_name : "(null)",
		       table_name ? table_name : "(null)",
                       orig_table_name ? orig_table_name : "(null)",
		       field_name ? field_name : "(null)",
                       orig_field_name ? orig_field_name : "(null)"));
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#endif
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  Item::cleanup();
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  db_name= orig_db_name; 
  table_name= orig_table_name;
  field_name= orig_field_name;
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  /* Store if this Item was depended */
  can_be_depended= test(depended_from);
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  DBUG_VOID_RETURN;
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}

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bool Item_ident::remove_dependence_processor(uchar * arg)
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{
  DBUG_ENTER("Item_ident::remove_dependence_processor");
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  if (get_depended_from() == (st_select_lex *) arg)
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    depended_from= 0;
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  context= &((st_select_lex *) arg)->context;
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  DBUG_RETURN(0);
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}


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bool Item_ident::collect_outer_ref_processor(uchar *param)
{
  Collect_deps_prm *prm= (Collect_deps_prm *)param;
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  if (depended_from &&
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      depended_from->nest_level_base == prm->nest_level_base &&
      depended_from->nest_level < prm->nest_level)
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  {
    if (prm->collect)
      prm->parameters->add_unique(this, &cmp_items);
    else
      prm->count++;
  }
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  return FALSE;
}


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/**
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  Store the pointer to this item field into a list if not already there.

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  The method is used by Item::walk to collect all unique Item_field objects
  from a tree of Items into a set of items represented as a list.
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  Item_cond::walk() and Item_func::walk() stop the evaluation of the
  processor function for its arguments once the processor returns
  true.Therefore in order to force this method being called for all item
  arguments in a condition the method must return false.
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  @param arg  pointer to a List<Item_field>
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  @return
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    FALSE to force the evaluation of collect_item_field_processor
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    for the subsequent items.
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*/

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bool Item_field::collect_item_field_processor(uchar *arg)
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{
  DBUG_ENTER("Item_field::collect_item_field_processor");
  DBUG_PRINT("info", ("%s", field->field_name ? field->field_name : "noname"));
  List<Item_field> *item_list= (List<Item_field>*) arg;
  List_iterator<Item_field> item_list_it(*item_list);
  Item_field *curr_item;
  while ((curr_item= item_list_it++))
  {
    if (curr_item->eq(this, 1))
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      DBUG_RETURN(FALSE); /* Already in the set. */
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  }
  item_list->push_back(this);
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  DBUG_RETURN(FALSE);
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}


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bool Item_field::add_field_to_set_processor(uchar *arg)
{
  DBUG_ENTER("Item_field::add_field_to_set_processor");
  DBUG_PRINT("info", ("%s", field->field_name ? field->field_name : "noname"));
  TABLE *table= (TABLE *) arg;
  if (field->table == table)
    bitmap_set_bit(&table->tmp_set, field->field_index);
  DBUG_RETURN(FALSE);
}

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/**
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  Check if an Item_field references some field from a list of fields.

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  Check whether the Item_field represented by 'this' references any
  of the fields in the keyparts passed via 'arg'. Used with the
  method Item::walk() to test whether any keypart in a sequence of
  keyparts is referenced in an expression.
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  @param arg   Field being compared, arg must be of type Field
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  @retval
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    TRUE  if 'this' references the field 'arg'
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  @retval
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    FALSE otherwise
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*/
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bool Item_field::find_item_in_field_list_processor(uchar *arg)
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{
  KEY_PART_INFO *first_non_group_part= *((KEY_PART_INFO **) arg);
  KEY_PART_INFO *last_part= *(((KEY_PART_INFO **) arg) + 1);
  KEY_PART_INFO *cur_part;

  for (cur_part= first_non_group_part; cur_part != last_part; cur_part++)
  {
    if (field->eq(cur_part->field))
      return TRUE;
  }
  return FALSE;
}


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/*
  Mark field in read_map

  NOTES
    This is used by filesort to register used fields in a a temporary
    column read set or to register used fields in a view
*/

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bool Item_field::register_field_in_read_map(uchar *arg)
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{
  TABLE *table= (TABLE *) arg;
  if (field->table == table || !table)
    bitmap_set_bit(field->table->read_set, field->field_index);
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  if (field->vcol_info && field->vcol_info->expr_item)
    return field->vcol_info->expr_item->walk(&Item::register_field_in_read_map, 
                                             1, arg);
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  return 0;
}

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/*
  @brief
  Mark field in bitmap supplied as *arg
*/

bool Item_field::register_field_in_bitmap(uchar *arg)
{
  MY_BITMAP *bitmap= (MY_BITMAP *) arg;
  DBUG_ASSERT(bitmap);
  bitmap_set_bit(bitmap, field->field_index);
  return 0;
}
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/*
  Mark field in write_map

  NOTES
    This is used by UPDATE to register underlying fields of used view fields.
*/

bool Item_field::register_field_in_write_map(uchar *arg)
{
  TABLE *table= (TABLE *) arg;
  if (field->table == table || !table)
    bitmap_set_bit(field->table->write_set, field->field_index);
  return 0;
}


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bool Item::check_cols(uint c)
{
  if (c != 1)
  {
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    my_error(ER_OPERAND_COLUMNS, MYF(0), c);
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    return 1;
  }
  return 0;
}

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void Item::set_name(const char *str, uint length, CHARSET_INFO *cs)
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{
  if (!length)
  {
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    /* Empty string, used by AS or internal function like last_insert_id() */
    name= (char*) str;
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    name_length= 0;
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    return;
  }
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  if (cs->ctype)
  {
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    const char *str_start= str;

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    /*
      This will probably need a better implementation in the future:
      a function in CHARSET_INFO structure.
    */
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    while (length && !my_isgraph(cs,*str))
    {						// Fix problem with yacc
      length--;
      str++;
    }
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    if (str != str_start && !is_autogenerated_name)
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    {
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      char buff[SAFE_NAME_LEN];
      strmake(buff, str_start,
              min(sizeof(buff)-1, length + (int) (str-str_start)));

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      if (length == 0)
        push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_NAME_BECOMES_EMPTY, ER(ER_NAME_BECOMES_EMPTY),
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                            buff);
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      else
        push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_REMOVED_SPACES, ER(ER_REMOVED_SPACES),
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                            buff);
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    }
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  }
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  if (!my_charset_same(cs, system_charset_info))
  {
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    size_t res_length;
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    name= sql_strmake_with_convert(str, length, cs,
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				   MAX_ALIAS_NAME, system_charset_info,
				   &res_length);
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    name_length= res_length;
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  }
  else
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    name= sql_strmake(str, (name_length= min(length,MAX_ALIAS_NAME)));
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}

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void Item::set_name_no_truncate(const char *str, uint length, CHARSET_INFO *cs)
{
  if (!my_charset_same(cs, system_charset_info))
  {
    size_t res_length;
    name= sql_strmake_with_convert(str, length, cs,
				   UINT_MAX, system_charset_info,
				   &res_length);
    name_length= res_length;
  }
  else
    name= sql_strmake(str, (name_length= length));
}


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void Item::set_name_for_rollback(THD *thd, const char *str, uint length,
                                 CHARSET_INFO *cs)
{
  char *old_name, *new_name; 
  old_name= name;
  set_name(str, length, cs);
  new_name= name;
  if (old_name != new_name)
  {
    name= old_name;
    thd->change_item_tree((Item **) &name, (Item *) new_name);
  }
}


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/**
  @details
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  This function is called when:
  - Comparing items in the WHERE clause (when doing where optimization)
  - When trying to find an ORDER BY/GROUP BY item in the SELECT part
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*/

bool Item::eq(const Item *item, bool binary_cmp) const
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{
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  /*
    Note, that this is never TRUE if item is a Item_param:
    for all basic constants we have special checks, and Item_param's
    type() can be only among basic constant types.
  */
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  return type() == item->type() && name && item->name &&
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    !my_strcasecmp(system_charset_info,name,item->name);
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}

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Item *Item::safe_charset_converter(CHARSET_INFO *tocs)
{
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  Item_func_conv_charset *conv= new Item_func_conv_charset(this, tocs, 1);
  return conv->safe ? conv : NULL;
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}


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/**
  @details
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  Created mostly for mysql_prepare_table(). Important
  when a string ENUM/SET column is described with a numeric default value:

  CREATE TABLE t1(a SET('a') DEFAULT 1);

  We cannot use generic Item::safe_charset_converter(), because
  the latter returns a non-fixed Item, so val_str() crashes afterwards.
  Override Item_num method, to return a fixed item.
*/
Item *Item_num::safe_charset_converter(CHARSET_INFO *tocs)
{
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  /*
    Item_num returns pure ASCII result,
    so conversion is needed only in case of "tricky" character
    sets like UCS2. If tocs is not "tricky", return the item itself.
  */
  if (!(tocs->state & MY_CS_NONASCII))
    return this;
  
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  Item_string *conv;
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  uint conv_errors;
  char buf[64], buf2[64];
  String tmp(buf, sizeof(buf), &my_charset_bin);
  String cstr(buf2, sizeof(buf2), &my_charset_bin);
  String *ostr= val_str(&tmp);
  char *ptr;
  cstr.copy(ostr->ptr(), ostr->length(), ostr->charset(), tocs, &conv_errors);
  if (conv_errors || !(conv= new Item_string(cstr.ptr(), cstr.length(),
                                             cstr.charset(),
                                             collation.derivation)))
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  {
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    /*
      Safe conversion is not possible (or EOM).
      We could not convert a string into the requested character set
      without data loss. The target charset does not cover all the
      characters from the string. Operation cannot be done correctly.
    */
    return NULL;
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  }
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  if (!(ptr= current_thd->strmake(cstr.ptr(), cstr.length())))
    return NULL;
  conv->str_value.set(ptr, cstr.length(), cstr.charset());
  /* Ensure that no one is going to change the result string */
  conv->str_value.mark_as_const();
  conv->fix_char_length(max_char_length());
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  return conv;
}


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Item *Item_static_float_func::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_string *conv;
  char buf[64];
  String *s, tmp(buf, sizeof(buf), &my_charset_bin);
  s= val_str(&tmp);
  if ((conv= new Item_static_string_func(func_name, s->ptr(), s->length(),
                                         s->charset())))
  {
    conv->str_value.copy();
    conv->str_value.mark_as_const();
  }
  return conv;
}


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Item *Item_string::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_string *conv;
  uint conv_errors;
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  char *ptr;
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  String tmp, cstr, *ostr= val_str(&tmp);
  cstr.copy(ostr->ptr(), ostr->length(), ostr->charset(), tocs, &conv_errors);
  if (conv_errors || !(conv= new Item_string(cstr.ptr(), cstr.length(),
                                             cstr.charset(),
                                             collation.derivation)))
  {
    /*
      Safe conversion is not possible (or EOM).
      We could not convert a string into the requested character set
      without data loss. The target charset does not cover all the
      characters from the string. Operation cannot be done correctly.
    */
    return NULL;
  }
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  if (!(ptr= current_thd->strmake(cstr.ptr(), cstr.length())))
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    return NULL;
  conv->str_value.set(ptr, cstr.length(), cstr.charset());
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  /* Ensure that no one is going to change the result string */
  conv->str_value.mark_as_const();
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  return conv;
}


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Item *Item_param::safe_charset_converter(CHARSET_INFO *tocs)
{
  if (const_item())
  {
    uint cnv_errors;
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    String *ostr= val_str(&cnvstr);
    cnvitem->str_value.copy(ostr->ptr(), ostr->length(),
                            ostr->charset(), tocs, &cnv_errors);
    if (cnv_errors)
       return NULL;
    cnvitem->str_value.mark_as_const();
    cnvitem->max_length= cnvitem->str_value.numchars() * tocs->mbmaxlen;
    return cnvitem;
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  }
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  return Item::safe_charset_converter(tocs);
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}


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Item *Item_static_string_func::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_string *conv;
  uint conv_errors;
  String tmp, cstr, *ostr= val_str(&tmp);
  cstr.copy(ostr->ptr(), ostr->length(), ostr->charset(), tocs, &conv_errors);
  if (conv_errors ||
      !(conv= new Item_static_string_func(func_name,
                                          cstr.ptr(), cstr.length(),
                                          cstr.charset(),
                                          collation.derivation)))
  {
    /*
      Safe conversion is not possible (or EOM).
      We could not convert a string into the requested character set
      without data loss. The target charset does not cover all the
      characters from the string. Operation cannot be done correctly.
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    */
    return NULL;
  }
  conv->str_value.copy();
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  /* Ensure that no one is going to change the result string */
  conv->str_value.mark_as_const();
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  return conv;
}


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bool Item_string::eq(const Item *item, bool binary_cmp) const
{
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  if (type() == item->type() && item->basic_const_item())
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  {
    if (binary_cmp)
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      return !stringcmp(&str_value, &item->str_value);
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    return (collation.collation == item->collation.collation &&
	    !sortcmp(&str_value, &item->str_value, collation.collation));
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  }
  return 0;
}


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/**
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  Get the value of the function as a MYSQL_TIME structure.
1221
  As a extra convenience the time structure is reset on error or NULL values!
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*/
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bool Item::get_date(MYSQL_TIME *ltime,ulonglong fuzzydate)
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{
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  if (field_type() == MYSQL_TYPE_TIME)
    fuzzydate|= TIME_TIME_ONLY;
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  switch (result_type()) {
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  case INT_RESULT:
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  {
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    longlong value= val_int();
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    if (field_type() == MYSQL_TYPE_YEAR)
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    {
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      if (max_length == 2)
      {
        if (value < 70)
          value+= 2000;
        else if (value <= 1900)
          value+= 1900;
      }
      value*= 10000; /* make it YYYYMMHH */
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    }
1244
    if (null_value || int_to_datetime_with_warn(value, ltime, fuzzydate,
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                                                field_name_or_null()))
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      goto err;
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    break;
  }
  case REAL_RESULT:
  {
    double value= val_real();
1252
    if (null_value || double_to_datetime_with_warn(value, ltime, fuzzydate,
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                                                   field_name_or_null()))
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      goto err;
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    break;
  }
  case DECIMAL_RESULT:
  {
    my_decimal value, *res;
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    if (!(res= val_decimal(&value)) ||
        decimal_to_datetime_with_warn(res, ltime, fuzzydate,
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                                      field_name_or_null()))
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      goto err;
    break;
  }
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  case STRING_RESULT:
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  {
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    char buff[40];
    String tmp(buff,sizeof(buff), &my_charset_bin),*res;
    if (!(res=val_str(&tmp)) ||
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        str_to_datetime_with_warn(res->charset(), res->ptr(), res->length(),
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                                  ltime, fuzzydate) <= MYSQL_TIMESTAMP_ERROR)
      goto err;
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    break;
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  }
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  default:
    DBUG_ASSERT(0);
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  }
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  return null_value= 0;
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err:
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  /*
    if the item was not null and convertion failed, we return a zero date
    if allowed, otherwise - null.
  */
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  bzero((char*) ltime,sizeof(*ltime));
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  return null_value|= (fuzzydate & (TIME_NO_ZERO_DATE|TIME_NO_ZERO_IN_DATE));
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}

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bool Item::get_seconds(ulonglong *sec, ulong *sec_part)
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{
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  if (decimals == 0)
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  { // optimize for an important special case
    longlong val= val_int();
    bool neg= val < 0 && !unsigned_flag;
    *sec= neg ? -val : val;
    *sec_part= 0;
    return neg;
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  }
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  my_decimal tmp, *dec= val_decimal(&tmp);
  if (!dec)
    return 0;
  return my_decimal2seconds(dec, sec, sec_part);
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}

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CHARSET_INFO *Item::default_charset()
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{
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  return current_thd->variables.collation_connection;
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}

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/*
  Save value in field, but don't give any warnings

  NOTES
   This is used to temporary store and retrieve a value in a column,
   for example in opt_range to adjust the key value to fit the column.
*/

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int Item::save_in_field_no_warnings(Field *field, bool no_conversions)
{
  int res;
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  TABLE *table= field->table;
  THD *thd= table->in_use;
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  enum_check_fields tmp= thd->count_cuted_fields;
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  my_bitmap_map *old_map= dbug_tmp_use_all_columns(table, table->write_set);
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  ulonglong sql_mode= thd->variables.sql_mode;
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  thd->variables.sql_mode&= ~(MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE);
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  thd->variables.sql_mode|= MODE_INVALID_DATES;
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  thd->count_cuted_fields= CHECK_FIELD_IGNORE;
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  res= save_in_field(field, no_conversions);
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  thd->count_cuted_fields= tmp;
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  dbug_tmp_restore_column_map(table->write_set, old_map);
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  thd->variables.sql_mode= sql_mode;
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  return res;
}


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/*****************************************************************************
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  Item_sp_variable methods
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*****************************************************************************/
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Item_sp_variable::Item_sp_variable(char *sp_var_name_str,
                                   uint sp_var_name_length)
  :m_thd(0)
#ifndef DBUG_OFF
   , m_sp(0)
#endif
{
  m_name.str= sp_var_name_str;
  m_name.length= sp_var_name_length;
}


bool Item_sp_variable::fix_fields(THD *thd, Item **)
{
  Item *it;

  m_thd= thd; /* NOTE: this must be set before any this_xxx() */
  it= this_item();

  DBUG_ASSERT(it->fixed);

  max_length= it->max_length;
  decimals= it->decimals;
  unsigned_flag= it->unsigned_flag;
  fixed= 1;
  collation.set(it->collation.collation, it->collation.derivation);

  return FALSE;
}


double Item_sp_variable::val_real()
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{
  DBUG_ASSERT(fixed);
  Item *it= this_item();
  double ret= it->val_real();
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  null_value= it->null_value;
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  return ret;
}


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longlong Item_sp_variable::val_int()
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{
  DBUG_ASSERT(fixed);
  Item *it= this_item();
  longlong ret= it->val_int();
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  null_value= it->null_value;
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  return ret;
}


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String *Item_sp_variable::val_str(String *sp)
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{
  DBUG_ASSERT(fixed);
  Item *it= this_item();
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  String *res= it->val_str(sp);
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  null_value= it->null_value;
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  if (!res)
    return NULL;

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  /*
    This way we mark returned value of val_str as const,
    so that various functions (e.g. CONCAT) won't try to
    modify the value of the Item. Analogous mechanism is
    implemented for Item_param.
    Without this trick Item_splocal could be changed as a
    side-effect of expression computation. Here is an example
    of what happens without it: suppose x is varchar local
    variable in a SP with initial value 'ab' Then
      select concat(x,'c');
    would change x's value to 'abc', as Item_func_concat::val_str()
    would use x's internal buffer to compute the result.
    This is intended behaviour of Item_func_concat. Comments to
    Item_param class contain some more details on the topic.
  */
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  if (res != &str_value)
    str_value.set(res->ptr(), res->length(), res->charset());
  else
    res->mark_as_const();
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  return &str_value;
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}


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my_decimal *Item_sp_variable::val_decimal(my_decimal *decimal_value)
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{
  DBUG_ASSERT(fixed);
  Item *it= this_item();
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  my_decimal *val= it->val_decimal(decimal_value);
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  null_value= it->null_value;
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  return val;
}


1443
bool Item_sp_variable::is_null()
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{
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  return this_item()->is_null();
}


/*****************************************************************************
  Item_splocal methods
*****************************************************************************/

Item_splocal::Item_splocal(const LEX_STRING &sp_var_name,
                           uint sp_var_idx,
                           enum_field_types sp_var_type,
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                           uint pos_in_q, uint len_in_q)
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  :Item_sp_variable(sp_var_name.str, sp_var_name.length),
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   m_var_idx(sp_var_idx),
   limit_clause_param(FALSE),
   pos_in_query(pos_in_q), len_in_query(len_in_q)
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{
  maybe_null= TRUE;

  m_type= sp_map_item_type(sp_var_type);
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  m_field_type= sp_var_type;
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  m_result_type= sp_map_result_type(sp_var_type);
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}


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Item *
Item_splocal::this_item()
{
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  DBUG_ASSERT(m_sp == m_thd->spcont->sp);

  return m_thd->spcont->get_item(m_var_idx);
}

const Item *
Item_splocal::this_item() const
{
  DBUG_ASSERT(m_sp == m_thd->spcont->sp);

  return m_thd->spcont->get_item(m_var_idx);
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}

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Item **
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Item_splocal::this_item_addr(THD *thd, Item **)
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{
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  DBUG_ASSERT(m_sp == thd->spcont->sp);

  return thd->spcont->get_item_addr(m_var_idx);
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}

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void Item_splocal::print(String *str, enum_query_type)
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{
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  str->reserve(m_name.length+8);
  str->append(m_name.str, m_name.length);
  str->append('@');
  str->qs_append(m_var_idx);
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}

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bool Item_splocal::set_value(THD *thd, sp_rcontext *ctx, Item **it)
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{
  return ctx->set_variable(thd, get_var_idx(), it);
}


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/*****************************************************************************
  Item_case_expr methods
*****************************************************************************/

1515
Item_case_expr::Item_case_expr(uint case_expr_id)
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  :Item_sp_variable( C_STRING_WITH_LEN("case_expr")),
1517
   m_case_expr_id(case_expr_id)
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{
}


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Item *
Item_case_expr::this_item()
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{
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  DBUG_ASSERT(m_sp == m_thd->spcont->sp);

  return m_thd->spcont->get_case_expr(m_case_expr_id);
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}


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const Item *
Item_case_expr::this_item() const
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{
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  DBUG_ASSERT(m_sp == m_thd->spcont->sp);

  return m_thd->spcont->get_case_expr(m_case_expr_id);
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}


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Item **
Item_case_expr::this_item_addr(THD *thd, Item **)
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{
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  DBUG_ASSERT(m_sp == thd->spcont->sp);

  return thd->spcont->get_case_expr_addr(m_case_expr_id);
}


1550
void Item_case_expr::print(String *str, enum_query_type)
1551
{
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  if (str->reserve(MAX_INT_WIDTH + sizeof("case_expr@")))
    return;                                    /* purecov: inspected */
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  (void) str->append(STRING_WITH_LEN("case_expr@"));
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  str->qs_append(m_case_expr_id);
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}


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/*****************************************************************************
  Item_name_const methods
*****************************************************************************/
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double Item_name_const::val_real()
{
  DBUG_ASSERT(fixed);
  double ret= value_item->val_real();
  null_value= value_item->null_value;
  return ret;
}


longlong Item_name_const::val_int()
{
  DBUG_ASSERT(fixed);
  longlong ret= value_item->val_int();
  null_value= value_item->null_value;
  return ret;
}


String *Item_name_const::val_str(String *sp)
{
  DBUG_ASSERT(fixed);
  String *ret= value_item->val_str(sp);
  null_value= value_item->null_value;
  return ret;
}


my_decimal *Item_name_const::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed);
  my_decimal *val= value_item->val_decimal(decimal_value);
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  null_value= value_item->null_value;
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  return val;
}


bool Item_name_const::is_null()
{
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  return value_item->is_null();
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}

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Item_name_const::Item_name_const(Item *name_arg, Item *val):
    value_item(val), name_item(name_arg)
{
  if (!(valid_args= name_item->basic_const_item() &&
                    (value_item->basic_const_item() ||
                     ((value_item->type() == FUNC_ITEM) &&
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                      ((((Item_func *) value_item)->functype() ==
                         Item_func::COLLATE_FUNC) ||
                      ((((Item_func *) value_item)->functype() ==
                         Item_func::NEG_FUNC) &&
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                      (((Item_func *) value_item)->key_item()->type() !=
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                         FUNC_ITEM)))))))
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    my_error(ER_WRONG_ARGUMENTS, MYF(0), "NAME_CONST");
  Item::maybe_null= TRUE;
}


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Item::Type Item_name_const::type() const
{
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  /*
    As 
    1. one can try to create the Item_name_const passing non-constant 
    arguments, although it's incorrect and 
    2. the type() method can be called before the fix_fields() to get
    type information for a further type cast, e.g. 
    if (item->type() == FIELD_ITEM) 
      ((Item_field *) item)->... 
    we return NULL_ITEM in the case to avoid wrong casting.
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    valid_args guarantees value_item->basic_const_item(); if type is
    FUNC_ITEM, then we have a fudged item_func_neg() on our hands
    and return the underlying type.
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    For Item_func_set_collation()
    e.g. NAME_CONST('name', 'value' COLLATE collation) we return its
    'value' argument type. 
1640
  */
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  if (!valid_args)
    return NULL_ITEM;
  Item::Type value_type= value_item->type();
  if (value_type == FUNC_ITEM)
  {
    /* 
      The second argument of NAME_CONST('name', 'value') must be 
      a simple constant item or a NEG_FUNC/COLLATE_FUNC.
    */
    DBUG_ASSERT(((Item_func *) value_item)->functype() == 
                Item_func::NEG_FUNC ||
                ((Item_func *) value_item)->functype() == 
                Item_func::COLLATE_FUNC);
    return ((Item_func *) value_item)->key_item()->type();            
  }
  return value_type;
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}


1660
bool Item_name_const::fix_fields(THD *thd, Item **ref)
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{
  char buf[128];
  String *item_name;
  String s(buf, sizeof(buf), &my_charset_bin);
  s.length(0);

  if (value_item->fix_fields(thd, &value_item) ||
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      name_item->fix_fields(thd, &name_item) ||
      !value_item->const_item() ||
      !name_item->const_item() ||
      !(item_name= name_item->val_str(&s))) // Can't have a NULL name 
  {
    my_error(ER_RESERVED_SYNTAX, MYF(0), "NAME_CONST");
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    return TRUE;
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  }
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  if (is_autogenerated_name)
  {
    set_name(item_name->ptr(), (uint) item_name->length(), system_charset_info);
  }
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  collation.set(value_item->collation.collation, DERIVATION_IMPLICIT);
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  max_length= value_item->max_length;
  decimals= value_item->decimals;
  fixed= 1;
  return FALSE;
}


1688
void Item_name_const::print(String *str, enum_query_type query_type)
1689
{
1690
  str->append(STRING_WITH_LEN("NAME_CONST("));
1691
  name_item->print(str, query_type);
1692
  str->append(',');
1693
  value_item->print(str, query_type);
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  str->append(')');
}

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/*
 need a special class to adjust printing : references to aggregate functions 
 must not be printed as refs because the aggregate functions that are added to
 the front of select list are not printed as well.
*/
class Item_aggregate_ref : public Item_ref
{
public:
  Item_aggregate_ref(Name_resolution_context *context_arg, Item **item,
                  const char *table_name_arg, const char *field_name_arg)
    :Item_ref(context_arg, item, table_name_arg, field_name_arg) {}

1710
  virtual inline void print (String *str, enum_query_type query_type)
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  {
    if (ref)
1713
      (*ref)->print(str, query_type);
1714
    else
1715
      Item_ident::print(str, query_type);
1716
  }
1717
  virtual Ref_Type ref_type() { return AGGREGATE_REF; }
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};


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/**
  Move SUM items out from item tree and replace with reference.
1723

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  @param thd			Thread handler
  @param ref_pointer_array	Pointer to array of reference fields
  @param fields		All fields in select
  @param ref			Pointer to item
  @param skip_registered       <=> function be must skipped for registered
                               SUM items
1730

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  @note
    This is from split_sum_func2() for items that should be split
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    All found SUM items are added FIRST in the fields list and
    we replace the item with a reference.
1736

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    thd->fatal_error() may be called if we are out of memory
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*/

void Item::split_sum_func2(THD *thd, Item **ref_pointer_array,
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                           List<Item> &fields, Item **ref, 
                           bool skip_registered)
1743
{
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  /* An item of type Item_sum  is registered <=> ref_by != 0 */ 
  if (type() == SUM_FUNC_ITEM && skip_registered && 
      ((Item_sum *) this)->ref_by)
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    return;
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  if ((type() != SUM_FUNC_ITEM && with_sum_func) ||
      (type() == FUNC_ITEM &&
       (((Item_func *) this)->functype() == Item_func::ISNOTNULLTEST_FUNC ||
        ((Item_func *) this)->functype() == Item_func::TRIG_COND_FUNC)))
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  {
    /* Will split complicated items and ignore simple ones */
    split_sum_func(thd, ref_pointer_array, fields);
  }
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  else if ((type() == SUM_FUNC_ITEM || (used_tables() & ~PARAM_TABLE_BIT)) &&
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           type() != SUBSELECT_ITEM &&
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           (type() != REF_ITEM ||
           ((Item_ref*)this)->ref_type() == Item_ref::VIEW_REF))
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  {
    /*
      Replace item with a reference so that we can easily calculate
      it (in case of sum functions) or copy it (in case of fields)

      The test above is to ensure we don't do a reference for things
      that are constants (PARAM_TABLE_BIT is in effect a constant)
      or already referenced (for example an item in HAVING)
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      Exception is Item_direct_view_ref which we need to convert to
      Item_ref to allow fields from view being stored in tmp table.
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    */
1771
    Item_aggregate_ref *item_ref;
1772
    uint el= fields.elements;
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    /*
      If this is an item_ref, get the original item
      This is a safety measure if this is called for things that is
      already a reference.
    */
1778
    Item *real_itm= real_item();
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    ref_pointer_array[el]= real_itm;
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    if (!(item_ref= new Item_aggregate_ref(&thd->lex->current_select->context,
1782
                                           ref_pointer_array + el, 0, name)))
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      return;                                   // fatal_error is set
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    if (type() == SUM_FUNC_ITEM)
      item_ref->depended_from= ((Item_sum *) this)->depended_from(); 
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    fields.push_front(real_itm);
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    thd->change_item_tree(ref, item_ref);
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  }
}


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static bool
left_is_superset(DTCollation *left, DTCollation *right)
{
  /* Allow convert to Unicode */
  if (left->collation->state & MY_CS_UNICODE &&
      (left->derivation < right->derivation ||
       (left->derivation == right->derivation &&
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        (!(right->collation->state & MY_CS_UNICODE) ||
         /* The code below makes 4-byte utf8 a superset over 3-byte utf8 */
         (left->collation->state & MY_CS_UNICODE_SUPPLEMENT &&
          !(right->collation->state & MY_CS_UNICODE_SUPPLEMENT) &&
          left->collation->mbmaxlen > right->collation->mbmaxlen &&
          left->collation->mbminlen == right->collation->mbminlen)))))
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    return TRUE;
  /* Allow convert from ASCII */
  if (right->repertoire == MY_REPERTOIRE_ASCII &&
      (left->derivation < right->derivation ||
       (left->derivation == right->derivation &&
        !(left->repertoire == MY_REPERTOIRE_ASCII))))
    return TRUE;
  /* Disallow conversion otherwise */
  return FALSE;
}

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/**
  Aggregate two collations together taking
  into account their coercibility (aka derivation):.

  0 == DERIVATION_EXPLICIT  - an explicitly written COLLATE clause @n
  1 == DERIVATION_NONE      - a mix of two different collations @n
  2 == DERIVATION_IMPLICIT  - a column @n
  3 == DERIVATION_COERCIBLE - a string constant.

  The most important rules are:
  -# If collations are the same:
  chose this collation, and the strongest derivation.
  -# If collations are different:
  - Character sets may differ, but only if conversion without
  data loss is possible. The caller provides flags whether
  character set conversion attempts should be done. If no
  flags are substituted, then the character sets must be the same.
  Currently processed flags are:
  MY_COLL_ALLOW_SUPERSET_CONV  - allow conversion to a superset
  MY_COLL_ALLOW_COERCIBLE_CONV - allow conversion of a coercible value
  - two EXPLICIT collations produce an error, e.g. this is wrong:
  CONCAT(expr1 collate latin1_swedish_ci, expr2 collate latin1_german_ci)
  - the side with smaller derivation value wins,
  i.e. a column is stronger than a string constant,
  an explicit COLLATE clause is stronger than a column.
  - if derivations are the same, we have DERIVATION_NONE,
  we'll wait for an explicit COLLATE clause which possibly can
  come from another argument later: for example, this is valid,
  but we don't know yet when collecting the first two arguments:
     @code
       CONCAT(latin1_swedish_ci_column,
              latin1_german1_ci_column,
              expr COLLATE latin1_german2_ci)
  @endcode
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*/
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1852
bool DTCollation::aggregate(DTCollation &dt, uint flags)
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{
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  if (!my_charset_same(collation, dt.collation))
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  {
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    /* 
       We do allow to use binary strings (like BLOBS)
       together with character strings.
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       Binaries have more precedence than a character
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       string of the same derivation.
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    */
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    if (collation == &my_charset_bin)
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    {
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      if (derivation <= dt.derivation)
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      {
	/* Do nothing */
      }
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      else
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      {
	set(dt); 
      }
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    }
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    else if (dt.collation == &my_charset_bin)
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    {
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      if (dt.derivation <= derivation)
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      {
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        set(dt);
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      }
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    }
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    else if ((flags & MY_COLL_ALLOW_SUPERSET_CONV) &&
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             left_is_superset(this, &dt))
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    {
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      /* Do nothing */
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    }
    else if ((flags & MY_COLL_ALLOW_SUPERSET_CONV) &&
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             left_is_superset(&dt, this))
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    {
      set(dt);
    }
    else if ((flags & MY_COLL_ALLOW_COERCIBLE_CONV) &&
             derivation < dt.derivation &&
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             dt.derivation >= DERIVATION_SYSCONST)
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    {
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      /* Do nothing */
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    }
    else if ((flags & MY_COLL_ALLOW_COERCIBLE_CONV) &&
             dt.derivation < derivation &&
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             derivation >= DERIVATION_SYSCONST)
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    {
      set(dt);
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    }
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    else
    {
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      // Cannot apply conversion
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      set(&my_charset_bin, DERIVATION_NONE,
          (dt.repertoire|repertoire));
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      return 1;
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    }
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  }
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  else if (derivation < dt.derivation)
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  {
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    /* Do nothing */
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  }
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  else if (dt.derivation < derivation)
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  {
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    set(dt);
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  }
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  else
  { 
    if (collation == dt.collation)
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    {
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      /* Do nothing */
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    }
    else 
    {
      if (derivation == DERIVATION_EXPLICIT)
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      {
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        set(0, DERIVATION_NONE, 0);
        return 1;
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      }
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      if (collation->state & MY_CS_BINSORT)
        return 0;
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      if (dt.collation->state & MY_CS_BINSORT)
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      {
        set(dt);
        return 0;
      }
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      CHARSET_INFO *bin= get_charset_by_csname(collation->csname, 
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                                               MY_CS_BINSORT,MYF(0));
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      set(bin, DERIVATION_NONE);
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    }
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  }
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  repertoire|= dt.repertoire;
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  return 0;
}

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/******************************/
static
void my_coll_agg_error(DTCollation &c1, DTCollation &c2, const char *fname)
{
  my_error(ER_CANT_AGGREGATE_2COLLATIONS,MYF(0),
           c1.collation->name,c1.derivation_name(),
           c2.collation->name,c2.derivation_name(),
           fname);
}


static
void my_coll_agg_error(DTCollation &c1, DTCollation &c2, DTCollation &c3,
                       const char *fname)
{
  my_error(ER_CANT_AGGREGATE_3COLLATIONS,MYF(0),
  	   c1.collation->name,c1.derivation_name(),
	   c2.collation->name,c2.derivation_name(),
	   c3.collation->name,c3.derivation_name(),
	   fname);
}


static
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void my_coll_agg_error(Item** args, uint count, const char *fname,
                       int item_sep)
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{
  if (count == 2)
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    my_coll_agg_error(args[0]->collation, args[item_sep]->collation, fname);
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  else if (count == 3)
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    my_coll_agg_error(args[0]->collation, args[item_sep]->collation,
                      args[2*item_sep]->collation, fname);
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  else
    my_error(ER_CANT_AGGREGATE_NCOLLATIONS,MYF(0),fname);
}


bool agg_item_collations(DTCollation &c, const char *fname,
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                         Item **av, uint count, uint flags, int item_sep)
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{
  uint i;
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  Item **arg;
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  bool unknown_cs= 0;

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  c.set(av[0]->collation);
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  for (i= 1, arg= &av[item_sep]; i < count; i++, arg++)
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  {
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    if (c.aggregate((*arg)->collation, flags))
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    {
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      if (c.derivation == DERIVATION_NONE &&
          c.collation == &my_charset_bin)
      {
        unknown_cs= 1;
        continue;
      }
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      my_coll_agg_error(av, count, fname, item_sep);
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      return TRUE;
    }
  }
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  if (unknown_cs &&
      c.derivation != DERIVATION_EXPLICIT)
  {
    my_coll_agg_error(av, count, fname, item_sep);
    return TRUE;
  }

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  if ((flags & MY_COLL_DISALLOW_NONE) &&
      c.derivation == DERIVATION_NONE)
  {
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    my_coll_agg_error(av, count, fname, item_sep);
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    return TRUE;
  }
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  /* If all arguments where numbers, reset to @@collation_connection */
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  if (flags & MY_COLL_ALLOW_NUMERIC_CONV &&
      c.derivation == DERIVATION_NUMERIC)
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    c.set(Item::default_charset(), DERIVATION_COERCIBLE, MY_REPERTOIRE_NUMERIC);

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  return FALSE;
}


bool agg_item_collations_for_comparison(DTCollation &c, const char *fname,
                                        Item **av, uint count, uint flags)
{
  return (agg_item_collations(c, fname, av, count,
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                              flags | MY_COLL_DISALLOW_NONE, 1));
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}


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bool agg_item_set_converter(DTCollation &coll, const char *fname,
                            Item **args, uint nargs, uint flags, int item_sep)
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{
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  Item **arg, *safe_args[2]= {NULL, NULL};
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  /*
    For better error reporting: save the first and the second argument.
    We need this only if the the number of args is 3 or 2:
    - for a longer argument list, "Illegal mix of collations"
      doesn't display each argument's characteristics.
    - if nargs is 1, then this error cannot happen.
  */
  if (nargs >=2 && nargs <= 3)
  {
    safe_args[0]= args[0];
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    safe_args[1]= args[item_sep];
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  }

  THD *thd= current_thd;
  bool res= FALSE;
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  uint i;
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  /*
    In case we're in statement prepare, create conversion item
    in its memory: it will be reused on each execute.
  */
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  Query_arena backup;
  Query_arena *arena= thd->stmt_arena->is_stmt_prepare() ?
                      thd->activate_stmt_arena_if_needed(&backup) :
                      NULL;
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  for (i= 0, arg= args; i < nargs; i++, arg+= item_sep)
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  {
    Item* conv;
    uint32 dummy_offset;
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    if (!String::needs_conversion(1, (*arg)->collation.collation,
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                                  coll.collation,
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                                  &dummy_offset))
      continue;

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    /*
      No needs to add converter if an "arg" is NUMERIC or DATETIME
      value (which is pure ASCII) and at the same time target DTCollation
      is ASCII-compatible. For example, no needs to rewrite:
        SELECT * FROM t1 WHERE datetime_field = '2010-01-01';
      to
        SELECT * FROM t1 WHERE CONVERT(datetime_field USING cs) = '2010-01-01';
      
      TODO: avoid conversion of any values with
      repertoire ASCII and 7bit-ASCII-compatible,
      not only numeric/datetime origin.
    */
    if ((*arg)->collation.derivation == DERIVATION_NUMERIC &&
        (*arg)->collation.repertoire == MY_REPERTOIRE_ASCII &&
        !((*arg)->collation.collation->state & MY_CS_NONASCII) &&
        !(coll.collation->state & MY_CS_NONASCII))
      continue;

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    if (!(conv= (*arg)->safe_charset_converter(coll.collation)) &&
        ((*arg)->collation.repertoire == MY_REPERTOIRE_ASCII))
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      conv= new Item_func_conv_charset(*arg, coll.collation, 1);
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    if (!conv)
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    {
      if (nargs >=2 && nargs <= 3)
      {
        /* restore the original arguments for better error message */
        args[0]= safe_args[0];
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        args[item_sep]= safe_args[1];
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      }
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      my_coll_agg_error(args, nargs, fname, item_sep);
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      res= TRUE;
      break; // we cannot return here, we need to restore "arena".
    }
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    if ((*arg)->type() == Item::FIELD_ITEM)
      ((Item_field *)(*arg))->no_const_subst= 1;
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    /*
      If in statement prepare, then we create a converter for two
      constant items, do it once and then reuse it.
      If we're in execution of a prepared statement, arena is NULL,
      and the conv was created in runtime memory. This can be
      the case only if the argument is a parameter marker ('?'),
      because for all true constants the charset converter has already
      been created in prepare. In this case register the change for
      rollback.
    */
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    if (thd->stmt_arena->is_stmt_prepare())
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      *arg= conv;
    else
      thd->change_item_tree(arg, conv);
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    if (conv->fix_fields(thd, arg))
    {
      res= TRUE;
      break; // we cannot return here, we need to restore "arena".
    }
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  }
  if (arena)
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    thd->restore_active_arena(arena, &backup);
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  return res;
}


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/* 
  Collect arguments' character sets together.
  We allow to apply automatic character set conversion in some cases.
  The conditions when conversion is possible are:
  - arguments A and B have different charsets
  - A wins according to coercibility rules
    (i.e. a column is stronger than a string constant,
     an explicit COLLATE clause is stronger than a column)
  - character set of A is either superset for character set of B,
    or B is a string constant which can be converted into the
    character set of A without data loss.
    
  If all of the above is true, then it's possible to convert
  B into the character set of A, and then compare according
  to the collation of A.
  
  For functions with more than two arguments:

    collect(A,B,C) ::= collect(collect(A,B),C)

  Since this function calls THD::change_item_tree() on the passed Item **
  pointers, it is necessary to pass the original Item **'s, not copies.
  Otherwise their values will not be properly restored (see BUG#20769).
  If the items are not consecutive (eg. args[2] and args[5]), use the
  item_sep argument, ie.

    agg_item_charsets(coll, fname, &args[2], 2, flags, 3)

*/

bool agg_item_charsets(DTCollation &coll, const char *fname,
                       Item **args, uint nargs, uint flags, int item_sep)
{
  if (agg_item_collations(coll, fname, args, nargs, flags, item_sep))
    return TRUE;

  return agg_item_set_converter(coll, fname, args, nargs, flags, item_sep);
}


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void Item_ident_for_show::make_field(Send_field *tmp_field)
{
  tmp_field->table_name= tmp_field->org_table_name= table_name;
  tmp_field->db_name= db_name;
  tmp_field->col_name= tmp_field->org_col_name= field->field_name;
  tmp_field->charsetnr= field->charset()->number;
  tmp_field->length=field->field_length;
  tmp_field->type=field->type();
  tmp_field->flags= field->table->maybe_null ? 
    (field->flags & ~NOT_NULL_FLAG) : field->flags;
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  tmp_field->decimals= field->decimals();
2192
}
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/**********************************************/

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Item_field::Item_field(Field *f)
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  :Item_ident(0, NullS, *f->table_name, f->field_name),
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   item_equal(0), no_const_subst(0),
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   have_privileges(0), any_privileges(0)
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{
  set_field(f);
2202
  /*
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    field_name and table_name should not point to garbage
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    if this item is to be reused
  */
  orig_table_name= orig_field_name= "";
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  with_field= 1;
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}

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/**
  Constructor used inside setup_wild().

  Ensures that field, table, and database names will live as long as
  Item_field (this is important in prepared statements).
*/

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Item_field::Item_field(THD *thd, Name_resolution_context *context_arg,
                       Field *f)
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  :Item_ident(context_arg, f->table->s->db.str, *f->table_name, f->field_name),
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   item_equal(0), no_const_subst(0),
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   have_privileges(0), any_privileges(0)
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{
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  /*
    We always need to provide Item_field with a fully qualified field
    name to avoid ambiguity when executing prepared statements like
    SELECT * from d1.t1, d2.t1; (assuming d1.t1 and d2.t1 have columns
    with same names).
    This is because prepared statements never deal with wildcards in
    select list ('*') and always fix fields using fully specified path
    (i.e. db.table.column).
    No check for OOM: if db_name is NULL, we'll just get
    "Field not found" error.
    We need to copy db_name, table_name and field_name because they must
    be allocated in the statement memory, not in table memory (the table
    structure can go away and pop up again between subsequent executions
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    of a prepared statement or after the close_tables_for_reopen() call
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    in mysql_multi_update_prepare() or due to wildcard expansion in stored
    procedures).
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  */
  {
    if (db_name)
      orig_db_name= thd->strdup(db_name);
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    if (table_name)
      orig_table_name= thd->strdup(table_name);
    if (field_name)
      orig_field_name= thd->strdup(field_name);
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    /*
      We don't restore 'name' in cleanup because it's not changed
      during execution. Still we need it to point to persistent
      memory if this item is to be reused.
    */
    name= (char*) orig_field_name;
  }
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  set_field(f);
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  with_field= 1;
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}

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Item_field::Item_field(Name_resolution_context *context_arg,
                       const char *db_arg,const char *table_name_arg,
                       const char *field_name_arg)
  :Item_ident(context_arg, db_arg,table_name_arg,field_name_arg),
   field(0), result_field(0), item_equal(0), no_const_subst(0),
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   have_privileges(0), any_privileges(0)
2266
{
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  SELECT_LEX *select= current_thd->lex->current_select;
2268
  collation.set(DERIVATION_IMPLICIT);
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  if (select && select->parsing_place != IN_HAVING)
      select->select_n_where_fields++;
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  with_field= 1;
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}

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/**
  Constructor need to process subselect with temporary tables (see Item)
*/

2278
Item_field::Item_field(THD *thd, Item_field *item)
2279
  :Item_ident(thd, item),
2280
   field(item->field),
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   result_field(item->result_field),
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   item_equal(item->item_equal),
   no_const_subst(item->no_const_subst),
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   have_privileges(item->have_privileges),
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   any_privileges(item->any_privileges)
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{
  collation.set(DERIVATION_IMPLICIT);
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  with_field= 1;
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}
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/**
  Calculate the max column length not taking into account the
  limitations over integer types.

  When storing data into fields the server currently just ignores the
  limits specified on integer types, e.g. 1234 can safely be stored in
  an int(2) and will not cause an error.
  Thus when creating temporary tables and doing transformations
  we must adjust the maximum field length to reflect this fact.
  We take the un-restricted maximum length and adjust it similarly to
  how the declared length is adjusted wrt unsignedness etc.
  TODO: this all needs to go when we disable storing 1234 in int(2).

  @param field_par   Original field the use to calculate the lengths
  @param max_length  Item's calculated explicit max length
  @return            The adjusted max length
*/

inline static uint32
adjust_max_effective_column_length(Field *field_par, uint32 max_length)
{
  uint32 new_max_length= field_par->max_display_length();
  uint32 sign_length= (field_par->flags & UNSIGNED_FLAG) ? 0 : 1;

  switch (field_par->type())
  {
  case MYSQL_TYPE_INT24:
    /*
      Compensate for MAX_MEDIUMINT_WIDTH being 1 too long (8)
      compared to the actual number of digits that can fit into
      the column.
    */
    new_max_length+= 1;
    /* fall through */
  case MYSQL_TYPE_LONG:
  case MYSQL_TYPE_TINY:
  case MYSQL_TYPE_SHORT:

    /* Take out the sign and add a conditional sign */
    new_max_length= new_max_length - 1 + sign_length;
    break;

  /* BINGINT is always 20 no matter the sign */
  case MYSQL_TYPE_LONGLONG:
  /* make gcc happy */
  default:
    break;
  }

  /* Adjust only if the actual precision based one is bigger than specified */
  return new_max_length > max_length ? new_max_length : max_length;
}


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void Item_field::set_field(Field *field_par)
{
  field=result_field=field_par;			// for easy coding with fields
  maybe_null=field->maybe_null();
  decimals= field->decimals();
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  table_name= *field_par->table_name;
  field_name= field_par->field_name;
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  db_name= field_par->table->s->db.str;
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  alias_name_used= field_par->table->alias_name_used;
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  unsigned_flag=test(field_par->flags & UNSIGNED_FLAG);
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  collation.set(field_par->charset(), field_par->derivation(),
                field_par->repertoire());
  fix_char_length(field_par->char_length());
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  max_length= adjust_max_effective_column_length(field_par, max_length);

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  fixed= 1;
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  if (field->table->s->tmp_table == SYSTEM_TMP_TABLE)
    any_privileges= 0;
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}


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/**
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  Reset this item to point to a field from the new temporary table.
  This is used when we create a new temporary table for each execution
  of prepared statement.
*/

void Item_field::reset_field(Field *f)
{
  set_field(f);
  /* 'name' is pointing at field->field_name of old field */
  name= (char*) f->field_name;
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}

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bool Item_field::enumerate_field_refs_processor(uchar *arg)
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{
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  Field_enumerator *fe= (Field_enumerator*)arg;
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  fe->visit_field(this);
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  return FALSE;
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}

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bool Item_field::update_table_bitmaps_processor(uchar *arg)
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{
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  update_table_bitmaps();
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  return FALSE;
}
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const char *Item_ident::full_name() const
{
  char *tmp;
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  if (!table_name || !field_name)
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    return field_name ? field_name : name ? name : "tmp_field";
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  if (db_name && db_name[0])
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  {
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    tmp=(char*) sql_alloc((uint) strlen(db_name)+(uint) strlen(table_name)+
			  (uint) strlen(field_name)+3);
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    strxmov(tmp,db_name,".",table_name,".",field_name,NullS);
  }
  else
  {
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    if (table_name[0])
    {
      tmp= (char*) sql_alloc((uint) strlen(table_name) +
			     (uint) strlen(field_name) + 2);
      strxmov(tmp, table_name, ".", field_name, NullS);
    }
    else
      tmp= (char*) field_name;
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  }
  return tmp;
}

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void Item_ident::print(String *str, enum_query_type query_type)
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{
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  THD *thd= current_thd;
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  char d_name_buff[MAX_ALIAS_NAME], t_name_buff[MAX_ALIAS_NAME];
  const char *d_name= db_name, *t_name= table_name;
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  if (lower_case_table_names== 1 ||
      (lower_case_table_names == 2 && !alias_name_used))
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  {
    if (table_name && table_name[0])
    {
      strmov(t_name_buff, table_name);
      my_casedn_str(files_charset_info, t_name_buff);
      t_name= t_name_buff;
    }
    if (db_name && db_name[0])
    {
      strmov(d_name_buff, db_name);
      my_casedn_str(files_charset_info, d_name_buff);
      d_name= d_name_buff;
    }
  }

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  if (!table_name || !field_name || !field_name[0])
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  {
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    const char *nm= (field_name && field_name[0]) ?
                      field_name : name ? name : "tmp_field";
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    append_identifier(thd, str, nm, (uint) strlen(nm));
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    return;
  }
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  if (db_name && db_name[0] && !alias_name_used)
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  {
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    if (!(cached_table && cached_table->belong_to_view &&
          cached_table->belong_to_view->compact_view_format))
    {
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      append_identifier(thd, str, d_name, (uint)strlen(d_name));
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      str->append('.');
    }
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    append_identifier(thd, str, t_name, (uint)strlen(t_name));
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    str->append('.');
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    append_identifier(thd, str, field_name, (uint)strlen(field_name));
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  }
  else
  {
    if (table_name[0])
    {
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      append_identifier(thd, str, t_name, (uint) strlen(t_name));
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      str->append('.');
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      append_identifier(thd, str, field_name, (uint) strlen(field_name));
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    }
    else
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      append_identifier(thd, str, field_name, (uint) strlen(field_name));
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  }
}

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/* ARGSUSED */
String *Item_field::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  if ((null_value=field->is_null()))
    return 0;
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  str->set_charset(str_value.charset());
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  return field->val_str(str,&str_value);
}

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double Item_field::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  if ((null_value=field->is_null()))
    return 0.0;
  return field->val_real();
}

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longlong Item_field::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  if ((null_value=field->is_null()))
    return 0;
  return field->val_int();
}


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my_decimal *Item_field::val_decimal(my_decimal *decimal_value)
{
  if ((null_value= field->is_null()))
    return 0;
  return field->val_decimal(decimal_value);
}


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String *Item_field::str_result(String *str)
{
  if ((null_value=result_field->is_null()))
    return 0;
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  str->set_charset(str_value.charset());
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  return result_field->val_str(str,&str_value);
}

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bool Item_field::get_date(MYSQL_TIME *ltime,ulonglong fuzzydate)
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{
  if ((null_value=field->is_null()) || field->get_date(ltime,fuzzydate))
  {
    bzero((char*) ltime,sizeof(*ltime));
    return 1;
  }
  return 0;
}

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bool Item_field::get_date_result(MYSQL_TIME *ltime, ulonglong fuzzydate)
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{
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  if (result_field->is_null() || result_field->get_date(ltime,fuzzydate))
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  {
    bzero((char*) ltime,sizeof(*ltime));
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    return (null_value= 1);
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  }
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  return (null_value= 0);
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}

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void Item_field::save_result(Field *to)
{
  save_field_in_field(result_field, &null_value, to, TRUE);
}


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double Item_field::val_result()
{
  if ((null_value=result_field->is_null()))
    return 0.0;
  return result_field->val_real();
}

longlong Item_field::val_int_result()
{
  if ((null_value=result_field->is_null()))
    return 0;
  return result_field->val_int();
}

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my_decimal *Item_field::val_decimal_result(my_decimal *decimal_value)
{
  if ((null_value= result_field->is_null()))
    return 0;
  return result_field->val_decimal(decimal_value);
}


bool Item_field::val_bool_result()
{
  if ((null_value= result_field->is_null()))
    return FALSE;
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  switch (result_field->result_type()) {
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  case INT_RESULT:
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    return result_field->val_int() != 0;
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  case DECIMAL_RESULT:
  {
    my_decimal decimal_value;
    my_decimal *val= result_field->val_decimal(&decimal_value);
    if (val)
      return !my_decimal_is_zero(val);
    return 0;
  }
  case REAL_RESULT:
  case STRING_RESULT:
    return result_field->val_real() != 0.0;
  case ROW_RESULT:
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  case TIME_RESULT:
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  case IMPOSSIBLE_RESULT:
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    DBUG_ASSERT(0);
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    return 0;                                   // Shut up compiler
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  }
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  return 0;
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}


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bool Item_field::is_null_result()
{
  return (null_value=result_field->is_null());
}


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bool Item_field::eq(const Item *item, bool binary_cmp) const
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{
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  Item *real_item= ((Item *) item)->real_item();
  if (real_item->type() != FIELD_ITEM)
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    return 0;
  
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  Item_field *item_field= (Item_field*) real_item;
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  if (item_field->field && field)
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    return item_field->field == field;
  /*
    We may come here when we are trying to find a function in a GROUP BY
    clause from the select list.
    In this case the '100 % correct' way to do this would be to first
    run fix_fields() on the GROUP BY item and then retry this function, but
    I think it's better to relax the checking a bit as we will in
    most cases do the correct thing by just checking the field name.
    (In cases where we would choose wrong we would have to generate a
    ER_NON_UNIQ_ERROR).
  */
  return (!my_strcasecmp(system_charset_info, item_field->name,
			 field_name) &&
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	  (!item_field->table_name || !table_name ||
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	   (!my_strcasecmp(table_alias_charset, item_field->table_name,
			   table_name) &&
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	    (!item_field->db_name || !db_name ||
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	     (item_field->db_name && !strcmp(item_field->db_name,
					     db_name))))));
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}

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table_map Item_field::used_tables() const
{
  if (field->table->const_table)
    return 0;					// const item
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  return (get_depended_from() ? OUTER_REF_TABLE_BIT : field->table->map);
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}

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table_map Item_field::all_used_tables() const
{
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  return (get_depended_from() ? OUTER_REF_TABLE_BIT : field->table->map);
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}
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void Item_field::fix_after_pullout(st_select_lex *new_parent, Item **ref)
{
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  if (new_parent == get_depended_from())
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    depended_from= NULL;
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  if (context)
  {
    Name_resolution_context *ctx= new Name_resolution_context();
    ctx->outer_context= NULL; // We don't build a complete name resolver
    ctx->table_list= NULL;    // We rely on first_name_resolution_table instead
    ctx->select_lex= new_parent;
    ctx->first_name_resolution_table= context->first_name_resolution_table;
    ctx->last_name_resolution_table=  context->last_name_resolution_table;
    ctx->error_processor=             context->error_processor;
    ctx->error_processor_data=        context->error_processor_data;
    ctx->resolve_in_select_list=      context->resolve_in_select_list;
    ctx->security_ctx=                context->security_ctx;
    this->context=ctx;
  }
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}


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Item *Item_field::get_tmp_table_item(THD *thd)
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{
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  Item_field *new_item= new Item_field(thd, this);
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  if (new_item)
    new_item->field= new_item->result_field;
  return new_item;
}
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longlong Item_field::val_int_endpoint(bool left_endp, bool *incl_endp)
{
  longlong res= val_int();
  return null_value? LONGLONG_MIN : res;
}
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/**
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  Create an item from a string we KNOW points to a valid longlong
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  end \\0 terminated number string.
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  This is always 'signed'. Unsigned values are created with Item_uint()
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*/

Item_int::Item_int(const char *str_arg, uint length)
{
  char *end_ptr= (char*) str_arg + length;
  int error;
  value= my_strtoll10(str_arg, &end_ptr, &error);
  max_length= (uint) (end_ptr - str_arg);
  name= (char*) str_arg;
  fixed= 1;
}


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my_decimal *Item_int::val_decimal(my_decimal *decimal_value)
{
  int2my_decimal(E_DEC_FATAL_ERROR, value, unsigned_flag, decimal_value);
  return decimal_value;
}

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String *Item_int::val_str(String *str)
{
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  // following assert is redundant, because fixed=1 assigned in constructor
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  DBUG_ASSERT(fixed == 1);
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  str->set_int(value, unsigned_flag, collation.collation);
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  return str;
}

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void Item_int::print(String *str, enum_query_type query_type)
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{
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  // my_charset_bin is good enough for numbers
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  str_value.set_int(value, unsigned_flag, &my_charset_bin);
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  str->append(str_value);
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}

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Item_uint::Item_uint(const char *str_arg, uint length):
  Item_int(str_arg, length)
{
  unsigned_flag= 1;
}


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Item_uint::Item_uint(const char *str_arg, longlong i, uint length):
  Item_int(str_arg, i, length)
{
  unsigned_flag= 1;
}


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String *Item_uint::val_str(String *str)
{
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  // following assert is redundant, because fixed=1 assigned in constructor
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  DBUG_ASSERT(fixed == 1);
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  str->set((ulonglong) value, collation.collation);
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  return str;
}

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void Item_uint::print(String *str, enum_query_type query_type)
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{
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  // latin1 is good enough for numbers
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  str_value.set((ulonglong) value, default_charset());
  str->append(str_value);
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}

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Item_decimal::Item_decimal(const char *str_arg, uint length,
                           CHARSET_INFO *charset)
{
  str2my_decimal(E_DEC_FATAL_ERROR, str_arg, length, charset, &decimal_value);
  name= (char*) str_arg;
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
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  max_length= my_decimal_precision_to_length_no_truncation(decimal_value.intg +
                                                           decimals,
                                                           decimals,
                                                           unsigned_flag);
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}

Item_decimal::Item_decimal(longlong val, bool unsig)
{
  int2my_decimal(E_DEC_FATAL_ERROR, val, unsig, &decimal_value);
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
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  max_length= my_decimal_precision_to_length_no_truncation(decimal_value.intg +
                                                           decimals,
                                                           decimals,
                                                           unsigned_flag);
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}


Item_decimal::Item_decimal(double val, int precision, int scale)
{
  double2my_decimal(E_DEC_FATAL_ERROR, val, &decimal_value);
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
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  max_length= my_decimal_precision_to_length_no_truncation(decimal_value.intg +
                                                           decimals,
                                                           decimals,
                                                           unsigned_flag);
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}


Item_decimal::Item_decimal(const char *str, const my_decimal *val_arg,
                           uint decimal_par, uint length)
{
  my_decimal2decimal(val_arg, &decimal_value);
  name= (char*) str;
  decimals= (uint8) decimal_par;
  max_length= length;
  fixed= 1;
}


Item_decimal::Item_decimal(my_decimal *value_par)
{
  my_decimal2decimal(value_par, &decimal_value);
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
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  max_length= my_decimal_precision_to_length_no_truncation(decimal_value.intg +
                                                           decimals,
                                                           decimals,
                                                           unsigned_flag);
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}


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Item_decimal::Item_decimal(const uchar *bin, int precision, int scale)
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{
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  binary2my_decimal(E_DEC_FATAL_ERROR, bin,
                    &decimal_value, precision, scale);
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  decimals= (uint8) decimal_value.frac;
  fixed= 1;
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  max_length= my_decimal_precision_to_length_no_truncation(precision, decimals,
                                                           unsigned_flag);
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}


longlong Item_decimal::val_int()
{
  longlong result;
  my_decimal2int(E_DEC_FATAL_ERROR, &decimal_value, unsigned_flag, &result);
  return result;
}

double Item_decimal::val_real()
{
  double result;
  my_decimal2double(E_DEC_FATAL_ERROR, &decimal_value, &result);
  return result;
}

String *Item_decimal::val_str(String *result)
{
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  result->set_charset(&my_charset_numeric);
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  my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value, 0, 0, 0, result);
  return result;
}

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void Item_decimal::print(String *str, enum_query_type query_type)
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{
  my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value, 0, 0, 0, &str_value);
  str->append(str_value);
}


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bool Item_decimal::eq(const Item *item, bool binary_cmp) const
{
  if (type() == item->type() && item->basic_const_item())
  {
    /*
      We need to cast off const to call val_decimal(). This should
      be OK for a basic constant. Additionally, we can pass 0 as
      a true decimal constant will return its internal decimal
      storage and ignore the argument.
    */
    Item *arg= (Item*) item;
    my_decimal *value= arg->val_decimal(0);
    return !my_decimal_cmp(&decimal_value, value);
  }
  return 0;
}


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void Item_decimal::set_decimal_value(my_decimal *value_par)
{
  my_decimal2decimal(value_par, &decimal_value);
  decimals= (uint8) decimal_value.frac;
  unsigned_flag= !decimal_value.sign();
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  max_length= my_decimal_precision_to_length_no_truncation(decimal_value.intg +
                                                           decimals,
                                                           decimals,
                                                           unsigned_flag);
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}


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String *Item_float::val_str(String *str)
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{
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  // following assert is redundant, because fixed=1 assigned in constructor
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  DBUG_ASSERT(fixed == 1);
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  str->set_real(value,decimals,&my_charset_bin);
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  return str;
}

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my_decimal *Item_float::val_decimal(my_decimal *decimal_value)
{
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
  double2my_decimal(E_DEC_FATAL_ERROR, value, decimal_value);
  return (decimal_value);
}


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void Item_string::print(String *str, enum_query_type query_type)
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{
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  const bool print_introducer=
    !(query_type & QT_WITHOUT_INTRODUCERS) && is_cs_specified();
  if (print_introducer)
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  {
    str->append('_');
    str->append(collation.collation->csname);
  }

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  str->append('\'');
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  if (query_type & QT_TO_SYSTEM_CHARSET)
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  {
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    if (print_introducer)
    {
      /*
        Because we wrote an introducer, we must print str_value in its
        charset, and the resulting bytes must not be changed until they
        reach the end client.
        But the caller is asking for system_charset_info, and may later
        convert into character_set_results. That means two conversions: we
        must ensure that they don't change our printed bytes.
        So we print str_value in the least common denominator of the three
        charsets involved: ASCII. Non-ASCII characters are printed as \xFF
        sequences (which is ASCII too). This way, our bytes will not be
        changed.
      */
      ErrConvString tmp(str_value.ptr(), str_value.length(), &my_charset_bin);
      str->append(tmp.ptr());
    }
    else
    {
      if (my_charset_same(str_value.charset(), system_charset_info))
        str_value.print(str); // already in system_charset_info
      else // need to convert
      {
        THD *thd= current_thd;
        LEX_STRING utf8_lex_str;
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        thd->convert_string(&utf8_lex_str,
                            system_charset_info,
                            str_value.c_ptr_safe(),
                            str_value.length(),
                            str_value.charset());
2942

2943 2944 2945
        String utf8_str(utf8_lex_str.str,
                        utf8_lex_str.length,
                        system_charset_info);
2946

2947 2948 2949 2950 2951 2952 2953 2954
        utf8_str.print(str);
      }
    }
  }
  else
  {
    // Caller wants a result in the charset of str_value.
    str_value.print(str);
2955 2956
  }

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2957 2958 2959
  str->append('\'');
}

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2960

2961
double 
2962 2963
double_from_string_with_check(CHARSET_INFO *cs, const char *cptr,
                              const char *end)
2964 2965
{
  int error;
2966
  char *end_of_num= (char*) end;
2967 2968
  double tmp;

2969 2970 2971
  tmp= my_strntod(cs, (char*) cptr, end - cptr, &end_of_num, &error);
  if (error || (end != end_of_num &&
                !check_if_only_end_space(cs, end_of_num, end)))
2972
  {
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2973
    ErrConvString err(cptr, end - cptr, cs);
2974
    /*
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2975
      We can use err.ptr() here as ErrConvString is guranteed to put an
2976 2977
      end \0 here.
    */
2978 2979 2980
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_TRUNCATED_WRONG_VALUE,
                        ER(ER_TRUNCATED_WRONG_VALUE), "DOUBLE",
2981
                        err.ptr());
2982 2983 2984 2985 2986
  }
  return tmp;
}


2987
double Item_string::val_real()
2988 2989
{
  DBUG_ASSERT(fixed == 1);
2990 2991
  return double_from_string_with_check(str_value.charset(),
                                       str_value.ptr(), 
2992
                                       str_value.ptr() +
2993
                                       str_value.length());
2994 2995 2996 2997
}


longlong 
2998 2999
longlong_from_string_with_check(CHARSET_INFO *cs, const char *cptr,
                                const char *end)
3000
{
3001 3002
  int err;
  longlong tmp;
3003
  char *end_of_num= (char*) end;
3004

3005
  tmp= (*(cs->cset->strtoll10))(cs, cptr, &end_of_num, &err);
3006 3007 3008 3009
  /*
    TODO: Give error if we wanted a signed integer and we got an unsigned
    one
  */
3010 3011
  if (!current_thd->no_errors &&
      (err > 0 ||
3012
       (end != end_of_num && !check_if_only_end_space(cs, end_of_num, end))))
3013
  {
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3014
    ErrConvString err(cptr, end - cptr, cs);
3015 3016 3017
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_TRUNCATED_WRONG_VALUE,
                        ER(ER_TRUNCATED_WRONG_VALUE), "INTEGER",
3018
                        err.ptr());
3019 3020 3021 3022 3023
  }
  return tmp;
}


3024 3025 3026 3027 3028 3029 3030 3031
/**
  @todo
  Give error if we wanted a signed integer and we got an unsigned one
*/
longlong Item_string::val_int()
{
  DBUG_ASSERT(fixed == 1);
  return longlong_from_string_with_check(str_value.charset(), str_value.ptr(),
3032
                                         str_value.ptr()+ str_value.length());
3033 3034 3035
}


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3036 3037
my_decimal *Item_string::val_decimal(my_decimal *decimal_value)
{
3038
  return val_decimal_from_string(decimal_value);
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3039 3040 3041
}


3042 3043
bool Item_null::eq(const Item *item, bool binary_cmp) const
{ return item->type() == type(); }
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3044 3045


3046
double Item_null::val_real()
3047
{
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3048 3049
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
3050 3051 3052 3053 3054
  null_value=1;
  return 0.0;
}
longlong Item_null::val_int()
{
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3055 3056
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
3057 3058 3059
  null_value=1;
  return 0;
}
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3060 3061
/* ARGSUSED */
String *Item_null::val_str(String *str)
3062
{
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3063 3064
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
3065 3066 3067
  null_value=1;
  return 0;
}
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3068

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3069 3070 3071 3072 3073
my_decimal *Item_null::val_decimal(my_decimal *decimal_value)
{
  return 0;
}

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3074

3075 3076 3077 3078 3079 3080
Item *Item_null::safe_charset_converter(CHARSET_INFO *tocs)
{
  collation.set(tocs);
  return this;
}

3081 3082
/*********************** Item_param related ******************************/

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3083
/** 
3084
  Default function of Item_param::set_param_func, so in case
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  of malformed packet the server won't SIGSEGV.
3086 3087 3088 3089 3090 3091 3092 3093 3094 3095
*/

static void
default_set_param_func(Item_param *param,
                       uchar **pos __attribute__((unused)),
                       ulong len __attribute__((unused)))
{
  param->set_null();
}

3096

3097
Item_param::Item_param(uint pos_in_query_arg) :
3098
  state(NO_VALUE),
3099
  item_result_type(STRING_RESULT),
3100 3101
  /* Don't pretend to be a literal unless value for this item is set. */
  item_type(PARAM_ITEM),
3102
  param_type(MYSQL_TYPE_VARCHAR),
3103
  pos_in_query(pos_in_query_arg),
3104
  set_param_func(default_set_param_func),
3105 3106
  limit_clause_param(FALSE),
  m_out_param_info(NULL)
3107 3108
{
  name= (char*) "?";
3109 3110 3111 3112 3113 3114
  /* 
    Since we can't say whenever this item can be NULL or cannot be NULL
    before mysql_stmt_execute(), so we assuming that it can be NULL until
    value is set.
  */
  maybe_null= 1;
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3115 3116
  cnvitem= new Item_string("", 0, &my_charset_bin, DERIVATION_COERCIBLE);
  cnvstr.set(cnvbuf, sizeof(cnvbuf), &my_charset_bin);
3117
}
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3118

3119

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3120
void Item_param::set_null()
3121 3122
{
  DBUG_ENTER("Item_param::set_null");
3123
  /* These are cleared after each execution by reset() method */
3124 3125 3126 3127 3128 3129 3130 3131 3132
  null_value= 1;
  /* 
    Because of NULL and string values we need to set max_length for each new
    placeholder value: user can submit NULL for any placeholder type, and 
    string length can be different in each execution.
  */
  max_length= 0;
  decimals= 0;
  state= NULL_VALUE;
3133
  item_type= Item::NULL_ITEM;
3134
  DBUG_VOID_RETURN;
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3135 3136
}

3137
void Item_param::set_int(longlong i, uint32 max_length_arg)
3138 3139
{
  DBUG_ENTER("Item_param::set_int");
3140 3141 3142 3143
  value.integer= (longlong) i;
  state= INT_VALUE;
  max_length= max_length_arg;
  decimals= 0;
3144
  maybe_null= 0;
3145
  DBUG_VOID_RETURN;
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3146 3147
}

3148
void Item_param::set_double(double d)
3149 3150
{
  DBUG_ENTER("Item_param::set_double");
3151 3152 3153
  value.real= d;
  state= REAL_VALUE;
  max_length= DBL_DIG + 8;
3154
  decimals= NOT_FIXED_DEC;
3155
  maybe_null= 0;
3156
  DBUG_VOID_RETURN;
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3157 3158 3159
}


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3160
/**
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3161 3162
  Set decimal parameter value from string.

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3163 3164
  @param str      character string
  @param length   string length
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3165

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3166 3167
  @note
    As we use character strings to send decimal values in
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3168 3169 3170
    binary protocol, we use str2my_decimal to convert it to
    internal decimal value.
*/
3171

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3172 3173
void Item_param::set_decimal(const char *str, ulong length)
{
3174
  char *end;
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3175 3176
  DBUG_ENTER("Item_param::set_decimal");

3177 3178
  end= (char*) str+length;
  str2my_decimal(E_DEC_FATAL_ERROR, str, &decimal_value, &end);
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3179 3180
  state= DECIMAL_VALUE;
  decimals= decimal_value.frac;
3181 3182 3183
  max_length=
    my_decimal_precision_to_length_no_truncation(decimal_value.precision(),
                                                 decimals, unsigned_flag);
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3184 3185 3186 3187
  maybe_null= 0;
  DBUG_VOID_RETURN;
}

3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198
void Item_param::set_decimal(const my_decimal *dv)
{
  state= DECIMAL_VALUE;

  my_decimal2decimal(dv, &decimal_value);

  decimals= (uint8) decimal_value.frac;
  unsigned_flag= !decimal_value.sign();
  max_length= my_decimal_precision_to_length(decimal_value.intg + decimals,
                                             decimals, unsigned_flag);
}
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3199

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3200
/**
3201
  Set parameter value from MYSQL_TIME value.
3202

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3203 3204 3205
  @param tm              datetime value to set (time_type is ignored)
  @param type            type of datetime value
  @param max_length_arg  max length of datetime value as string
3206

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  @note
3208 3209 3210 3211 3212
    If we value to be stored is not normalized, zero value will be stored
    instead and proper warning will be produced. This function relies on
    the fact that even wrong value sent over binary protocol fits into
    MAX_DATE_STRING_REP_LENGTH buffer.
*/
3213
void Item_param::set_time(MYSQL_TIME *tm, timestamp_type time_type,
3214
                          uint32 max_length_arg)
3215
{ 
3216
  DBUG_ENTER("Item_param::set_time");
3217

3218
  value.time= *tm;
3219
  value.time.time_type= time_type;
3220

3221 3222
  if (value.time.year > 9999 || value.time.month > 12 ||
      value.time.day > 31 ||
3223
      (time_type != MYSQL_TIMESTAMP_TIME && value.time.hour > 23) ||
3224
      value.time.minute > 59 || value.time.second > 59 ||
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3225
      value.time.second_part > TIME_MAX_SECOND_PART)
3226
  {
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3227
    ErrConvTime str(&value.time);
3228
    make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
3229
                                 &str, time_type, 0);
3230 3231 3232
    set_zero_time(&value.time, MYSQL_TIMESTAMP_ERROR);
  }

3233
  state= TIME_VALUE;
3234
  maybe_null= 0;
3235
  max_length= max_length_arg;
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3236
  decimals= tm->second_part > 0 ? TIME_SECOND_PART_DIGITS : 0;
3237
  DBUG_VOID_RETURN;
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3238 3239
}

3240

3241 3242 3243 3244 3245 3246 3247
bool Item_param::set_str(const char *str, ulong length)
{
  DBUG_ENTER("Item_param::set_str");
  /*
    Assign string with no conversion: data is converted only after it's
    been written to the binary log.
  */
3248 3249 3250
  uint dummy_errors;
  if (str_value.copy(str, length, &my_charset_bin, &my_charset_bin,
                     &dummy_errors))
3251 3252
    DBUG_RETURN(TRUE);
  state= STRING_VALUE;
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3253
  max_length= length;
3254
  maybe_null= 0;
3255 3256 3257
  /* max_length and decimals are set after charset conversion */
  /* sic: str may be not null-terminated, don't add DBUG_PRINT here */
  DBUG_RETURN(FALSE);
3258 3259 3260
}


3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273
bool Item_param::set_longdata(const char *str, ulong length)
{
  DBUG_ENTER("Item_param::set_longdata");

  /*
    If client character set is multibyte, end of long data packet
    may hit at the middle of a multibyte character.  Additionally,
    if binary log is open we must write long data value to the
    binary log in character set of client. This is why we can't
    convert long data to connection character set as it comes
    (here), and first have to concatenate all pieces together,
    write query to the binary log and only then perform conversion.
  */
3274 3275 3276 3277 3278 3279 3280 3281 3282 3283
  if (str_value.length() + length > max_long_data_size)
  {
    my_message(ER_UNKNOWN_ERROR,
               "Parameter of prepared statement which is set through "
               "mysql_send_long_data() is longer than "
               "'max_long_data_size' bytes",
               MYF(0));
    DBUG_RETURN(true);
  }

3284 3285 3286
  if (str_value.append(str, length, &my_charset_bin))
    DBUG_RETURN(TRUE);
  state= LONG_DATA_VALUE;
3287
  maybe_null= 0;
3288 3289

  DBUG_RETURN(FALSE);
3290 3291 3292
}


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3293
/**
3294 3295
  Set parameter value from user variable value.

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3296 3297
  @param thd   Current thread
  @param entry User variable structure (NULL means use NULL value)
3298

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3299
  @retval
3300
    0 OK
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3301
  @retval
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3302
    1 Out of memory
3303 3304 3305 3306 3307 3308 3309 3310
*/

bool Item_param::set_from_user_var(THD *thd, const user_var_entry *entry)
{
  DBUG_ENTER("Item_param::set_from_user_var");
  if (entry && entry->value)
  {
    item_result_type= entry->type;
3311
    unsigned_flag= entry->unsigned_flag;
3312 3313
    if (limit_clause_param)
    {
3314
      bool unused;
3315 3316 3317 3318
      set_int(entry->val_int(&unused), MY_INT64_NUM_DECIMAL_DIGITS);
      item_type= Item::INT_ITEM;
      DBUG_RETURN(!unsigned_flag && value.integer < 0 ? 1 : 0);
    }
3319
    switch (item_result_type) {
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3320 3321
    case REAL_RESULT:
      set_double(*(double*)entry->value);
3322
      item_type= Item::REAL_ITEM;
3323
      param_type= MYSQL_TYPE_DOUBLE;
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3324 3325
      break;
    case INT_RESULT:
3326
      set_int(*(longlong*)entry->value, MY_INT64_NUM_DECIMAL_DIGITS);
3327
      item_type= Item::INT_ITEM;
3328
      param_type= MYSQL_TYPE_LONGLONG;
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3329 3330
      break;
    case STRING_RESULT:
3331
    {
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3332 3333 3334 3335
      CHARSET_INFO *fromcs= entry->collation.collation;
      CHARSET_INFO *tocs= thd->variables.collation_connection;
      uint32 dummy_offset;

3336 3337
      value.cs_info.character_set_of_placeholder= fromcs;
      value.cs_info.character_set_client= thd->variables.character_set_client;
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3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350
      /*
        Setup source and destination character sets so that they
        are different only if conversion is necessary: this will
        make later checks easier.
      */
      value.cs_info.final_character_set_of_str_value=
        String::needs_conversion(0, fromcs, tocs, &dummy_offset) ?
        tocs : fromcs;
      /*
        Exact value of max_length is not known unless data is converted to
        charset of connection, so we have to set it later.
      */
      item_type= Item::STRING_ITEM;
3351
      param_type= MYSQL_TYPE_VARCHAR;
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3352 3353 3354 3355 3356

      if (set_str((const char *)entry->value, entry->length))
        DBUG_RETURN(1);
      break;
    }
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3357 3358 3359 3360 3361 3362
    case DECIMAL_RESULT:
    {
      const my_decimal *ent_value= (const my_decimal *)entry->value;
      my_decimal2decimal(ent_value, &decimal_value);
      state= DECIMAL_VALUE;
      decimals= ent_value->frac;
3363 3364 3365
      max_length=
        my_decimal_precision_to_length_no_truncation(ent_value->precision(),
                                                     decimals, unsigned_flag);
3366
      item_type= Item::DECIMAL_ITEM;
3367
      param_type= MYSQL_TYPE_NEWDECIMAL;
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3368 3369
      break;
    }
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3370 3371
    case ROW_RESULT:
    case TIME_RESULT:
3372
    case IMPOSSIBLE_RESULT:
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3373 3374
      DBUG_ASSERT(0);
      set_null();
3375 3376 3377 3378 3379 3380 3381 3382
    }
  }
  else
    set_null();

  DBUG_RETURN(0);
}

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3383 3384 3385 3386 3387
/**
  Resets parameter after execution.

  @note
    We clear null_value here instead of setting it in set_* methods,
3388 3389 3390 3391
    because we want more easily handle case for long data.
*/

void Item_param::reset()
3392
{
3393
  DBUG_ENTER("Item_param::reset");
3394 3395 3396 3397 3398
  /* Shrink string buffer if it's bigger than max possible CHAR column */
  if (str_value.alloced_length() > MAX_CHAR_WIDTH)
    str_value.free();
  else
    str_value.length(0);
3399
  str_value_ptr.length(0);
3400
  /*
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3401
    We must prevent all charset conversions until data has been written
3402
    to the binary log.
3403 3404
  */
  str_value.set_charset(&my_charset_bin);
3405
  collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
3406
  state= NO_VALUE;
3407 3408
  maybe_null= 1;
  null_value= 0;
3409 3410 3411 3412 3413 3414 3415 3416 3417
  /*
    Don't reset item_type to PARAM_ITEM: it's only needed to guard
    us from item optimizations at prepare stage, when item doesn't yet
    contain a literal of some kind.
    In all other cases when this object is accessed its value is
    set (this assumption is guarded by 'state' and
    DBUG_ASSERTS(state != NO_VALUE) in all Item_param::get_*
    methods).
  */
3418
  DBUG_VOID_RETURN;
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3419 3420 3421
}


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3422
int Item_param::save_in_field(Field *field, bool no_conversions)
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3423 3424
{
  field->set_notnull();
3425 3426 3427

  switch (state) {
  case INT_VALUE:
3428
    return field->store(value.integer, unsigned_flag);
3429 3430
  case REAL_VALUE:
    return field->store(value.real);
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3431 3432
  case DECIMAL_VALUE:
    return field->store_decimal(&decimal_value);
3433
  case TIME_VALUE:
3434
    field->store_time_dec(&value.time, decimals);
3435
    return 0;
3436 3437 3438 3439 3440
  case STRING_VALUE:
  case LONG_DATA_VALUE:
    return field->store(str_value.ptr(), str_value.length(),
                        str_value.charset());
  case NULL_VALUE:
3441
    return set_field_to_null_with_conversions(field, no_conversions);
3442 3443 3444
  case NO_VALUE:
  default:
    DBUG_ASSERT(0);
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3445
  }
3446
  return 1;
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3447 3448
}

3449

3450
bool Item_param::get_date(MYSQL_TIME *res, ulonglong fuzzydate)
3451 3452 3453 3454 3455 3456 3457 3458 3459 3460
{
  if (state == TIME_VALUE)
  {
    *res= value.time;
    return 0;
  }
  return Item::get_date(res, fuzzydate);
}


3461
double Item_param::val_real()
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3462
{
3463 3464 3465 3466 3467
  switch (state) {
  case REAL_VALUE:
    return value.real;
  case INT_VALUE:
    return (double) value.integer;
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3468 3469 3470 3471 3472 3473
  case DECIMAL_VALUE:
  {
    double result;
    my_decimal2double(E_DEC_FATAL_ERROR, &decimal_value, &result);
    return result;
  }
3474 3475
  case STRING_VALUE:
  case LONG_DATA_VALUE:
3476 3477 3478 3479 3480 3481
  {
    int dummy_err;
    char *end_not_used;
    return my_strntod(str_value.charset(), (char*) str_value.ptr(),
                      str_value.length(), &end_not_used, &dummy_err);
  }
3482 3483 3484 3485 3486
  case TIME_VALUE:
    /*
      This works for example when user says SELECT ?+0.0 and supplies
      time value for the placeholder.
    */
3487
    return ulonglong2double(TIME_to_ulonglong(&value.time));
3488
  case NULL_VALUE:
3489
    return 0.0;
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3490
  default:
3491
    DBUG_ASSERT(0);
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3492
  }
3493
  return 0.0;
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3494 3495
} 

3496

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3497 3498
longlong Item_param::val_int() 
{ 
3499 3500
  switch (state) {
  case REAL_VALUE:
3501
    return (longlong) rint(value.real);
3502 3503
  case INT_VALUE:
    return value.integer;
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3504 3505 3506 3507 3508 3509
  case DECIMAL_VALUE:
  {
    longlong i;
    my_decimal2int(E_DEC_FATAL_ERROR, &decimal_value, unsigned_flag, &i);
    return i;
  }
3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520
  case STRING_VALUE:
  case LONG_DATA_VALUE:
    {
      int dummy_err;
      return my_strntoll(str_value.charset(), str_value.ptr(),
                         str_value.length(), 10, (char**) 0, &dummy_err);
    }
  case TIME_VALUE:
    return (longlong) TIME_to_ulonglong(&value.time);
  case NULL_VALUE:
    return 0; 
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3521
  default:
3522
    DBUG_ASSERT(0);
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3523
  }
3524
  return 0;
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3525 3526
}

3527

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my_decimal *Item_param::val_decimal(my_decimal *dec)
{
  switch (state) {
  case DECIMAL_VALUE:
    return &decimal_value;
  case REAL_VALUE:
    double2my_decimal(E_DEC_FATAL_ERROR, value.real, dec);
    return dec;
  case INT_VALUE:
    int2my_decimal(E_DEC_FATAL_ERROR, value.integer, unsigned_flag, dec);
    return dec;
  case STRING_VALUE:
  case LONG_DATA_VALUE:
    string2my_decimal(E_DEC_FATAL_ERROR, &str_value, dec);
    return dec;
  case TIME_VALUE:
  {
    longlong i= (longlong) TIME_to_ulonglong(&value.time);
    int2my_decimal(E_DEC_FATAL_ERROR, i, 0, dec);
    return dec;
  }
  case NULL_VALUE:
    return 0; 
  default:
    DBUG_ASSERT(0);
  }
  return 0;
}


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String *Item_param::val_str(String* str) 
{ 
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  switch (state) {
  case STRING_VALUE:
  case LONG_DATA_VALUE:
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    return &str_value_ptr;
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  case REAL_VALUE:
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    str->set_real(value.real, NOT_FIXED_DEC, &my_charset_bin);
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    return str;
  case INT_VALUE:
    str->set(value.integer, &my_charset_bin);
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    return str;
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  case DECIMAL_VALUE:
    if (my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value,
                          0, 0, 0, str) <= 1)
      return str;
    return NULL;
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  case TIME_VALUE:
  {
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    if (str->reserve(MAX_DATE_STRING_REP_LENGTH))
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      break;
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    str->length((uint) my_TIME_to_str(&value.time, (char*) str->ptr(),
                decimals));
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    str->set_charset(&my_charset_bin);
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    return str;
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  }
  case NULL_VALUE:
    return NULL; 
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  default:
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    DBUG_ASSERT(0);
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  }
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  return str;
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}
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/**
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  Return Param item values in string format, for generating the dynamic 
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  query used in update/binary logs.

  @todo
    - Change interface and implementation to fill log data in place
    and avoid one more memcpy/alloc between str and log string.
    - In case of error we need to notify replication
    that binary log contains wrong statement 
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*/

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const String *Item_param::query_val_str(THD *thd, String* str) const
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{
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  switch (state) {
  case INT_VALUE:
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    str->set_int(value.integer, unsigned_flag, &my_charset_bin);
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    break;
  case REAL_VALUE:
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    str->set_real(value.real, NOT_FIXED_DEC, &my_charset_bin);
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    break;
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  case DECIMAL_VALUE:
    if (my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value,
                          0, 0, 0, str) > 1)
      return &my_null_string;
    break;
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  case TIME_VALUE:
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    {
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      char *buf, *ptr;
      str->length(0);
      /*
        TODO: in case of error we need to notify replication
        that binary log contains wrong statement 
      */
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      if (str->reserve(MAX_DATE_STRING_REP_LENGTH+3))
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        break; 

      /* Create date string inplace */
      buf= str->c_ptr_quick();
      ptr= buf;
      *ptr++= '\'';
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      ptr+= (uint) my_TIME_to_str(&value.time, ptr, decimals);
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      *ptr++= '\'';
      str->length((uint32) (ptr - buf));
      break;
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    }
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  case STRING_VALUE:
  case LONG_DATA_VALUE:
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    {
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      str->length(0);
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      append_query_string(thd, value.cs_info.character_set_client, &str_value,
                          str);
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      break;
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    }
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  case NULL_VALUE:
    return &my_null_string;
  default:
    DBUG_ASSERT(0);
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  }
  return str;
}
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/**
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  Convert string from client character set to the character set of
  connection.
*/

bool Item_param::convert_str_value(THD *thd)
{
  bool rc= FALSE;
  if (state == STRING_VALUE || state == LONG_DATA_VALUE)
  {
    /*
      Check is so simple because all charsets were set up properly
      in setup_one_conversion_function, where typecode of
      placeholder was also taken into account: the variables are different
      here only if conversion is really necessary.
    */
    if (value.cs_info.final_character_set_of_str_value !=
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        value.cs_info.character_set_of_placeholder)
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    {
      rc= thd->convert_string(&str_value,
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                              value.cs_info.character_set_of_placeholder,
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                              value.cs_info.final_character_set_of_str_value);
    }
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    else
      str_value.set_charset(value.cs_info.final_character_set_of_str_value);
    /* Here str_value is guaranteed to be in final_character_set_of_str_value */

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    max_length= str_value.numchars() * str_value.charset()->mbmaxlen;
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    decimals= 0;
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    /*
      str_value_ptr is returned from val_str(). It must be not alloced
      to prevent it's modification by val_str() invoker.
    */
    str_value_ptr.set(str_value.ptr(), str_value.length(),
                      str_value.charset());
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    /* Synchronize item charset with value charset */
    collation.set(str_value.charset(), DERIVATION_COERCIBLE);
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  }
  return rc;
}

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bool Item_param::basic_const_item() const
{
  if (state == NO_VALUE || state == TIME_VALUE)
    return FALSE;
  return TRUE;
}

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Item *
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Item_param::clone_item()
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{
  /* see comments in the header file */
  switch (state) {
  case NULL_VALUE:
    return new Item_null(name);
  case INT_VALUE:
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    return (unsigned_flag ?
            new Item_uint(name, value.integer, max_length) :
            new Item_int(name, value.integer, max_length));
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  case REAL_VALUE:
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    return new Item_float(name, value.real, decimals, max_length);
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  case STRING_VALUE:
  case LONG_DATA_VALUE:
    return new Item_string(name, str_value.c_ptr_quick(), str_value.length(),
                           str_value.charset());
  case TIME_VALUE:
    break;
  case NO_VALUE:
  default:
    DBUG_ASSERT(0);
  };
  return 0;
}


bool
Item_param::eq(const Item *arg, bool binary_cmp) const
{
  Item *item;
  if (!basic_const_item() || !arg->basic_const_item() || arg->type() != type())
    return FALSE;
  /*
    We need to cast off const to call val_int(). This should be OK for
    a basic constant.
  */
  item= (Item*) arg;

  switch (state) {
  case NULL_VALUE:
    return TRUE;
  case INT_VALUE:
    return value.integer == item->val_int() &&
           unsigned_flag == item->unsigned_flag;
  case REAL_VALUE:
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    return value.real == item->val_real();
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  case STRING_VALUE:
  case LONG_DATA_VALUE:
    if (binary_cmp)
      return !stringcmp(&str_value, &item->str_value);
    return !sortcmp(&str_value, &item->str_value, collation.collation);
  default:
    break;
  }
  return FALSE;
}

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/* End of Item_param related */

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void Item_param::print(String *str, enum_query_type query_type)
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{
  if (state == NO_VALUE)
  {
    str->append('?');
  }
  else
  {
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    char buffer[STRING_BUFFER_USUAL_SIZE];
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    String tmp(buffer, sizeof(buffer), &my_charset_bin);
    const String *res;
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    res= query_val_str(current_thd, &tmp);
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    str->append(*res);
  }
}


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/**
  Preserve the original parameter types and values
  when re-preparing a prepared statement.

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  @details Copy parameter type information and conversion
  function pointers from a parameter of the old statement
  to the corresponding parameter of the new one.
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  Move parameter values from the old parameters to the new
  one. We simply "exchange" the values, which allows
  to save on allocation and character set conversion in
  case a parameter is a string or a blob/clob.

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  The old parameter gets the value of this one, which
  ensures that all memory of this parameter is freed
  correctly.

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  @param[in]  src   parameter item of the original
                    prepared statement
*/

void
Item_param::set_param_type_and_swap_value(Item_param *src)
{
  unsigned_flag= src->unsigned_flag;
  param_type= src->param_type;
  set_param_func= src->set_param_func;
  item_type= src->item_type;
  item_result_type= src->item_result_type;

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  collation.set(src->collation);
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  maybe_null= src->maybe_null;
  null_value= src->null_value;
  max_length= src->max_length;
  decimals= src->decimals;
  state= src->state;
  value= src->value;

  decimal_value.swap(src->decimal_value);
  str_value.swap(src->str_value);
  str_value_ptr.swap(src->str_value_ptr);
}

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/**
  This operation is intended to store some item value in Item_param to be
  used later.

  @param thd    thread context
  @param ctx    stored procedure runtime context
  @param it     a pointer to an item in the tree

  @return Error status
    @retval TRUE on error
    @retval FALSE on success
*/

bool
Item_param::set_value(THD *thd, sp_rcontext *ctx, Item **it)
{
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  Item *arg= *it;
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  if (arg->is_null())
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  {
    set_null();
    return FALSE;
  }

  null_value= FALSE;

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  switch (arg->result_type()) {
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  case STRING_RESULT:
  {
    char str_buffer[STRING_BUFFER_USUAL_SIZE];
    String sv_buffer(str_buffer, sizeof(str_buffer), &my_charset_bin);
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    String *sv= arg->val_str(&sv_buffer);
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    if (!sv)
      return TRUE;

    set_str(sv->c_ptr_safe(), sv->length());
    str_value_ptr.set(str_value.ptr(),
                      str_value.length(),
                      str_value.charset());
    collation.set(str_value.charset(), DERIVATION_COERCIBLE);
    decimals= 0;

    break;
  }

  case REAL_RESULT:
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    set_double(arg->val_real());
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    break;

  case INT_RESULT:
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    set_int(arg->val_int(), arg->max_length);
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    break;

  case DECIMAL_RESULT:
  {
    my_decimal dv_buf;
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    my_decimal *dv= arg->val_decimal(&dv_buf);
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    if (!dv)
      return TRUE;

    set_decimal(dv);
    break;
  }

  default:
    /* That can not happen. */

    DBUG_ASSERT(TRUE);  // Abort in debug mode.

    set_null();         // Set to NULL in release mode.
    return FALSE;
  }

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  item_result_type= arg->result_type();
  item_type= arg->type();
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  return FALSE;
}


/**
  Setter of Item_param::m_out_param_info.

  m_out_param_info is used to store information about store routine
  OUT-parameters, such as stored routine name, database, stored routine
  variable name. It is supposed to be set in sp_head::execute() after
  Item_param::set_value() is called.
*/

void
Item_param::set_out_param_info(Send_field *info)
{
  m_out_param_info= info;
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  param_type= m_out_param_info->type;
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}


/**
  Getter of Item_param::m_out_param_info.

  m_out_param_info is used to store information about store routine
  OUT-parameters, such as stored routine name, database, stored routine
  variable name. It is supposed to be retrieved in
  Protocol_binary::send_out_parameters() during creation of OUT-parameter
  result set.
*/

const Send_field *
Item_param::get_out_param_info() const
{
  return m_out_param_info;
}


/**
  Fill meta-data information for the corresponding column in a result set.
  If this is an OUT-parameter of a stored procedure, preserve meta-data of
  stored-routine variable.

  @param field container for meta-data to be filled
*/

void Item_param::make_field(Send_field *field)
{
  Item::make_field(field);

  if (!m_out_param_info)
    return;

  /*
    This is an OUT-parameter of stored procedure. We should use
    OUT-parameter info to fill out the names.
  */

  field->db_name= m_out_param_info->db_name;
  field->table_name= m_out_param_info->table_name;
  field->org_table_name= m_out_param_info->org_table_name;
  field->col_name= m_out_param_info->col_name;
  field->org_col_name= m_out_param_info->org_col_name;
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  field->length= m_out_param_info->length;
  field->charsetnr= m_out_param_info->charsetnr;
  field->flags= m_out_param_info->flags;
  field->decimals= m_out_param_info->decimals;
  field->type= m_out_param_info->type;
}

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/****************************************************************************
  Item_copy
****************************************************************************/
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Item_copy *Item_copy::create (Item *item)
{
  switch (item->result_type())
  {
    case STRING_RESULT:
      return new Item_copy_string (item);
    case REAL_RESULT: 
      return new Item_copy_float (item);
    case INT_RESULT:
      return item->unsigned_flag ? 
        new Item_copy_uint (item) : new Item_copy_int (item);
    case DECIMAL_RESULT:
      return new Item_copy_decimal (item);
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    case TIME_RESULT:
    case ROW_RESULT:
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  case IMPOSSIBLE_RESULT:
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      DBUG_ASSERT (0);
  }
  /* should not happen */
  return NULL;
}

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/****************************************************************************
  Item_copy_string
****************************************************************************/
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double Item_copy_string::val_real()
{
  int err_not_used;
  char *end_not_used;
  return (null_value ? 0.0 :
          my_strntod(str_value.charset(), (char*) str_value.ptr(),
                     str_value.length(), &end_not_used, &err_not_used));
}

longlong Item_copy_string::val_int()
{
  int err;
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  return null_value ? 0 : my_strntoll(str_value.charset(),str_value.ptr(),
                                          str_value.length(), 10, (char**) 0,
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                                          &err); 
}


int Item_copy_string::save_in_field(Field *field, bool no_conversions)
{
  return save_str_value_in_field(field, &str_value);
}


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void Item_copy_string::copy()
{
  String *res=item->val_str(&str_value);
  if (res && res != &str_value)
    str_value.copy(*res);
  null_value=item->null_value;
}

/* ARGSUSED */
String *Item_copy_string::val_str(String *str)
{
4038
  // Item_copy_string is used without fix_fields call
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  if (null_value)
    return (String*) 0;
  return &str_value;
}

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my_decimal *Item_copy_string::val_decimal(my_decimal *decimal_value)
{
  // Item_copy_string is used without fix_fields call
  if (null_value)
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    return (my_decimal *) 0;
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  string2my_decimal(E_DEC_FATAL_ERROR, &str_value, decimal_value);
  return (decimal_value);
}


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/****************************************************************************
  Item_copy_int
****************************************************************************/

void Item_copy_int::copy()
{
  cached_value= item->val_int();
  null_value=item->null_value;
}

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static int save_int_value_in_field (Field *, longlong, bool, bool);
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int Item_copy_int::save_in_field(Field *field, bool no_conversions)
{
  return save_int_value_in_field(field, cached_value, 
                                 null_value, unsigned_flag);
}


String *Item_copy_int::val_str(String *str)
{
  if (null_value)
    return (String *) 0;

  str->set(cached_value, &my_charset_bin);
  return str;
}


my_decimal *Item_copy_int::val_decimal(my_decimal *decimal_value)
{
  if (null_value)
    return (my_decimal *) 0;

  int2my_decimal(E_DEC_FATAL_ERROR, cached_value, unsigned_flag, decimal_value);
  return decimal_value;
}


/****************************************************************************
  Item_copy_uint
****************************************************************************/

String *Item_copy_uint::val_str(String *str)
{
  if (null_value)
    return (String *) 0;

  str->set((ulonglong) cached_value, &my_charset_bin);
  return str;
}


/****************************************************************************
  Item_copy_float
****************************************************************************/

String *Item_copy_float::val_str(String *str)
{
  if (null_value)
    return (String *) 0;
  else
  {
    double nr= val_real();
    str->set_real(nr,decimals, &my_charset_bin);
    return str;
  }
}


my_decimal *Item_copy_float::val_decimal(my_decimal *decimal_value)
{
  if (null_value)
    return (my_decimal *) 0;
  else
  {
    double nr= val_real();
    double2my_decimal(E_DEC_FATAL_ERROR, nr, decimal_value);
    return decimal_value;
  }
}


int Item_copy_float::save_in_field(Field *field, bool no_conversions)
{
  if (null_value)
    return set_field_to_null(field);
  field->set_notnull();
  return field->store(cached_value);
}


/****************************************************************************
  Item_copy_decimal
****************************************************************************/

int Item_copy_decimal::save_in_field(Field *field, bool no_conversions)
{
  if (null_value)
    return set_field_to_null(field);
  field->set_notnull();
  return field->store_decimal(&cached_value);
}


String *Item_copy_decimal::val_str(String *result)
{
  if (null_value)
    return (String *) 0;
  result->set_charset(&my_charset_bin);
  my_decimal2string(E_DEC_FATAL_ERROR, &cached_value, 0, 0, 0, result);
  return result;
}


double Item_copy_decimal::val_real()
{
  if (null_value)
    return 0.0;
  else
  {
    double result;
    my_decimal2double(E_DEC_FATAL_ERROR, &cached_value, &result);
    return result;
  }
}


longlong Item_copy_decimal::val_int()
{
  if (null_value)
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    return 0;
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  else
  {
    longlong result;
    my_decimal2int(E_DEC_FATAL_ERROR, &cached_value, unsigned_flag, &result);
    return result;
  }
}


void Item_copy_decimal::copy()
{
  my_decimal *nr= item->val_decimal(&cached_value);
  if (nr && nr != &cached_value)
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    my_decimal2decimal (nr, &cached_value);
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  null_value= item->null_value;
}


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/*
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  Functions to convert item to field (for send_result_set_metadata)
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*/

/* ARGSUSED */
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bool Item::fix_fields(THD *thd, Item **ref)
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{
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  // We do not check fields which are fixed during construction
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  DBUG_ASSERT(fixed == 0 || basic_const_item());
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  fixed= 1;
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  return FALSE;
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}

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void Item_ref_null_helper::save_val(Field *to)
{
  DBUG_ASSERT(fixed == 1);
  (*ref)->save_val(to);
  owner->was_null|= null_value= (*ref)->null_value;
}


4228
double Item_ref_null_helper::val_real()
4229
{
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  DBUG_ASSERT(fixed == 1);
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  double tmp= (*ref)->val_result();
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  owner->was_null|= null_value= (*ref)->null_value;
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  return tmp;
}
4235 4236


4237 4238
longlong Item_ref_null_helper::val_int()
{
4239
  DBUG_ASSERT(fixed == 1);
4240
  longlong tmp= (*ref)->val_int_result();
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  owner->was_null|= null_value= (*ref)->null_value;
4242 4243
  return tmp;
}
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my_decimal *Item_ref_null_helper::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed == 1);
  my_decimal *val= (*ref)->val_decimal_result(decimal_value);
  owner->was_null|= null_value= (*ref)->null_value;
  return val;
}


bool Item_ref_null_helper::val_bool()
{
  DBUG_ASSERT(fixed == 1);
  bool val= (*ref)->val_bool_result();
  owner->was_null|= null_value= (*ref)->null_value;
  return val;
}


4264 4265
String* Item_ref_null_helper::val_str(String* s)
{
4266
  DBUG_ASSERT(fixed == 1);
4267
  String* tmp= (*ref)->str_result(s);
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  owner->was_null|= null_value= (*ref)->null_value;
4269 4270
  return tmp;
}
4271 4272


4273
bool Item_ref_null_helper::get_date(MYSQL_TIME *ltime, ulonglong fuzzydate)
4274
{  
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  return (owner->was_null|= null_value= (*ref)->get_date_result(ltime, fuzzydate));
4276
}
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4278

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/**
  Mark item and SELECT_LEXs as dependent if item was resolved in
  outer SELECT.
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4282

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  @param thd             thread handler
  @param last            select from which current item depend
  @param current         current select
  @param resolved_item   item which was resolved in outer SELECT(for warning)
  @param mark_item       item which should be marked (can be differ in case of
                         substitution)
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*/

4291
static bool mark_as_dependent(THD *thd, SELECT_LEX *last, SELECT_LEX *current,
4292
                              Item_ident *resolved_item,
4293
                              Item_ident *mark_item)
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{
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  const char *db_name= (resolved_item->db_name ?
                        resolved_item->db_name : "");
  const char *table_name= (resolved_item->table_name ?
                           resolved_item->table_name : "");
4299
  /* store pointer on SELECT_LEX from which item is dependent */
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  if (mark_item && mark_item->can_be_depended)
4301
    mark_item->depended_from= last;
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  if (current->mark_as_dependent(thd, last, /** resolved_item psergey-thu
    **/mark_item))
    return TRUE;
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  if (thd->lex->describe & DESCRIBE_EXTENDED)
4306
  {
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    push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		 ER_WARN_FIELD_RESOLVED, ER(ER_WARN_FIELD_RESOLVED),
                 db_name, (db_name[0] ? "." : ""),
                 table_name, (table_name [0] ? "." : ""),
                 resolved_item->field_name,
                 current->select_number, last->select_number);
4313
  }
4314
  return FALSE;
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}


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/**
  Mark range of selects and resolved identifier (field/reference)
  item as dependent.
4321

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  @param thd             thread handler
  @param last_select     select where resolved_item was resolved
  @param current_sel     current select (select where resolved_item was placed)
  @param found_field     field which was found during resolving
  @param found_item      Item which was found during resolving (if resolved
                         identifier belongs to VIEW)
  @param resolved_item   Identifier which was resolved

  @note
4331 4332 4333 4334 4335 4336 4337 4338 4339
    We have to mark all items between current_sel (including) and
    last_select (excluding) as dependend (select before last_select should
    be marked with actual table mask used by resolved item, all other with
    OUTER_REF_TABLE_BIT) and also write dependence information to Item of
    resolved identifier.
*/

void mark_select_range_as_dependent(THD *thd,
                                    SELECT_LEX *last_select,
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                                    SELECT_LEX *current_sel,
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                                    Field *found_field, Item *found_item,
                                    Item_ident *resolved_item)
{
  /*
    Go from current SELECT to SELECT where field was resolved (it
    have to be reachable from current SELECT, because it was already
    done once when we resolved this field and cached result of
    resolving)
  */
  SELECT_LEX *previous_select= current_sel;
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4351 4352
  for (; previous_select->outer_select() != last_select;
       previous_select= previous_select->outer_select())
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  {
    Item_subselect *prev_subselect_item=
      previous_select->master_unit()->item;
    prev_subselect_item->used_tables_cache|= OUTER_REF_TABLE_BIT;
    prev_subselect_item->const_item_cache= 0;
  }
  {
    Item_subselect *prev_subselect_item=
      previous_select->master_unit()->item;
    Item_ident *dependent= resolved_item;
    if (found_field == view_ref_found)
    {
      Item::Type type= found_item->type();
      prev_subselect_item->used_tables_cache|=
        found_item->used_tables();
      dependent= ((type == Item::REF_ITEM || type == Item::FIELD_ITEM) ?
                  (Item_ident*) found_item :
                  0);
    }
    else
      prev_subselect_item->used_tables_cache|=
        found_field->table->map;
    prev_subselect_item->const_item_cache= 0;
    mark_as_dependent(thd, last_select, current_sel, resolved_item,
                      dependent);
  }
}
4380 4381


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/**
4383 4384
  Search a GROUP BY clause for a field with a certain name.

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  Search the GROUP BY list for a column named as find_item. When searching
  preference is given to columns that are qualified with the same table (and
  database) name as the one being searched for.
4388

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  @param find_item     the item being searched for
  @param group_list    GROUP BY clause
4391

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  @return
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    - the found item on success
    - NULL if find_item is not in group_list
*/

static Item** find_field_in_group_list(Item *find_item, ORDER *group_list)
{
  const char *db_name;
  const char *table_name;
  const char *field_name;
  ORDER      *found_group= NULL;
  int         found_match_degree= 0;
4404
  Item_ident *cur_field;
4405
  int         cur_match_degree= 0;
4406
  char        name_buff[SAFE_NAME_LEN+1];
4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417

  if (find_item->type() == Item::FIELD_ITEM ||
      find_item->type() == Item::REF_ITEM)
  {
    db_name=    ((Item_ident*) find_item)->db_name;
    table_name= ((Item_ident*) find_item)->table_name;
    field_name= ((Item_ident*) find_item)->field_name;
  }
  else
    return NULL;

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  if (db_name && lower_case_table_names)
  {
    /* Convert database to lower case for comparison */
    strmake(name_buff, db_name, sizeof(name_buff)-1);
    my_casedn_str(files_charset_info, name_buff);
    db_name= name_buff;
  }

4426
  DBUG_ASSERT(field_name != 0);
4427 4428 4429

  for (ORDER *cur_group= group_list ; cur_group ; cur_group= cur_group->next)
  {
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    if ((*(cur_group->item))->real_item()->type() == Item::FIELD_ITEM)
4431
    {
4432
      cur_field= (Item_ident*) *cur_group->item;
4433 4434
      cur_match_degree= 0;
      
4435
      DBUG_ASSERT(cur_field->field_name != 0);
4436 4437 4438 4439 4440 4441 4442 4443 4444 4445

      if (!my_strcasecmp(system_charset_info,
                         cur_field->field_name, field_name))
        ++cur_match_degree;
      else
        continue;

      if (cur_field->table_name && table_name)
      {
        /* If field_name is qualified by a table name. */
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        if (my_strcasecmp(table_alias_charset, cur_field->table_name, table_name))
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          /* Same field names, different tables. */
          return NULL;

        ++cur_match_degree;
        if (cur_field->db_name && db_name)
        {
          /* If field_name is also qualified by a database name. */
          if (strcmp(cur_field->db_name, db_name))
            /* Same field names, different databases. */
            return NULL;
          ++cur_match_degree;
        }
      }

      if (cur_match_degree > found_match_degree)
      {
        found_match_degree= cur_match_degree;
        found_group= cur_group;
      }
      else if (found_group && (cur_match_degree == found_match_degree) &&
               ! (*(found_group->item))->eq(cur_field, 0))
      {
        /*
          If the current resolve candidate matches equally well as the current
          best match, they must reference the same column, otherwise the field
          is ambiguous.
        */
4474 4475
        my_error(ER_NON_UNIQ_ERROR, MYF(0),
                 find_item->full_name(), current_thd->where);
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        return NULL;
      }
    }
  }

  if (found_group)
    return found_group->item;
  else
    return NULL;
}


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/**
4489 4490
  Resolve a column reference in a sub-select.

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  Resolve a column reference (usually inside a HAVING clause) against the
  SELECT and GROUP BY clauses of the query described by 'select'. The name
  resolution algorithm searches both the SELECT and GROUP BY clauses, and in
  case of a name conflict prefers GROUP BY column names over SELECT names. If
  both clauses contain different fields with the same names, a warning is
  issued that name of 'ref' is ambiguous. We extend ANSI SQL in that when no
  GROUP BY column is found, then a HAVING name is resolved as a possibly
  derived SELECT column. This extension is allowed only if the
  MODE_ONLY_FULL_GROUP_BY sql mode isn't enabled.

  @param thd     current thread
  @param ref     column reference being resolved
4503
  @param select  the select that ref is resolved against
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4504 4505

  @note
4506 4507
    The resolution procedure is:
    - Search for a column or derived column named col_ref_i [in table T_j]
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    in the SELECT clause of Q.
4509
    - Search for a column named col_ref_i [in table T_j]
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    in the GROUP BY clause of Q.
4511
    - If found different columns with the same name in GROUP BY and SELECT
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    - issue a warning and return the GROUP BY column,
    - otherwise
    - if the MODE_ONLY_FULL_GROUP_BY mode is enabled return error
    - else return the found SELECT column.
4516 4517


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  @return
    - NULL - there was an error, and the error was already reported
    - not_found_item - the item was not resolved, no error was reported
    - resolved item - if the item was resolved
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*/

static Item**
resolve_ref_in_select_and_group(THD *thd, Item_ident *ref, SELECT_LEX *select)
{
  Item **group_by_ref= NULL;
  Item **select_ref= NULL;
4529
  ORDER *group_list= select->group_list.first;
4530 4531
  bool ambiguous_fields= FALSE;
  uint counter;
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  enum_resolution_type resolution;
4533 4534 4535 4536 4537

  /*
    Search for a column or derived column named as 'ref' in the SELECT
    clause of the current select.
  */
4538 4539
  if (!(select_ref= find_item_in_list(ref, *(select->get_item_list()),
                                      &counter, REPORT_EXCEPT_NOT_FOUND,
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                                      &resolution)))
4541
    return NULL; /* Some error occurred. */
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4542 4543
  if (resolution == RESOLVED_AGAINST_ALIAS)
    ref->alias_name_used= TRUE;
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  /* If this is a non-aggregated field inside HAVING, search in GROUP BY. */
  if (select->having_fix_field && !ref->with_sum_func && group_list)
  {
    group_by_ref= find_field_in_group_list(ref, group_list);
    
    /* Check if the fields found in SELECT and GROUP BY are the same field. */
    if (group_by_ref && (select_ref != not_found_item) &&
        !((*group_by_ref)->eq(*select_ref, 0)))
    {
      ambiguous_fields= TRUE;
      push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_NON_UNIQ_ERROR,
                          ER(ER_NON_UNIQ_ERROR), ref->full_name(),
                          current_thd->where);

    }
  }

4562
  if (thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY &&
4563
      select->having_fix_field  &&
4564 4565 4566 4567 4568 4569 4570 4571 4572 4573
      select_ref != not_found_item && !group_by_ref)
  {
    /*
      Report the error if fields was found only in the SELECT item list and
      the strict mode is enabled.
    */
    my_error(ER_NON_GROUPING_FIELD_USED, MYF(0),
             ref->name, "HAVING");
    return NULL;
  }
4574 4575 4576 4577
  if (select_ref != not_found_item || group_by_ref)
  {
    if (select_ref != not_found_item && !ambiguous_fields)
    {
4578
      DBUG_ASSERT(*select_ref != 0);
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4579
      if (!select->ref_pointer_array[counter])
4580
      {
4581 4582
        my_error(ER_ILLEGAL_REFERENCE, MYF(0),
                 ref->name, "forward reference in item list");
4583 4584
        return NULL;
      }
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      DBUG_ASSERT((*select_ref)->fixed);
4586 4587
      return (select->ref_pointer_array + counter);
    }
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    if (group_by_ref)
4589
      return group_by_ref;
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    DBUG_ASSERT(FALSE);
    return NULL; /* So there is no compiler warning. */
4592
  }
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  return (Item**) not_found_item;
4595 4596 4597
}


4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625
/*
  @brief
  Whether a table belongs to an outer select.

  @param table table to check
  @param select current select

  @details
  Try to find select the table belongs to by ascending the derived tables chain.
*/

static
bool is_outer_table(TABLE_LIST *table, SELECT_LEX *select)
{
  DBUG_ASSERT(table->select_lex != select);
  TABLE_LIST *tl;

  for (tl= select->master_unit()->derived;
       tl && tl->is_merged_derived();
       select= tl->select_lex, tl= select->master_unit()->derived)
  {
    if (tl->select_lex == table->select_lex)
      return FALSE;
  }
  return TRUE;
}


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4626
/**
4627 4628
  Resolve the name of an outer select column reference.

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4629 4630
  The method resolves the column reference represented by 'this' as a column
  present in outer selects that contain current select.
4631

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4632 4633 4634 4635 4636
  In prepared statements, because of cache, find_field_in_tables()
  can resolve fields even if they don't belong to current context.
  In this case this method only finds appropriate context and marks
  current select as dependent. The found reference of field should be
  provided in 'from_field'.
4637

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4638 4639 4640 4641
  @param[in] thd             current thread
  @param[in,out] from_field  found field reference or (Field*)not_found_field
  @param[in,out] reference   view column if this item was resolved to a
    view column
4642

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4643 4644 4645 4646 4647 4648 4649
  @note
    This is the inner loop of Item_field::fix_fields:
  @code
        for each outer query Q_k beginning from the inner-most one
        {
          search for a column or derived column named col_ref_i
          [in table T_j] in the FROM clause of Q_k;
4650

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          if such a column is not found
            Search for a column or derived column named col_ref_i
            [in table T_j] in the SELECT and GROUP clauses of Q_k.
        }
  @endcode

  @retval
    1   column succefully resolved and fix_fields() should continue.
  @retval
    0   column fully fixed and fix_fields() should return FALSE
  @retval
    -1  error occured
4663
*/
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4664

4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682
int
Item_field::fix_outer_field(THD *thd, Field **from_field, Item **reference)
{
  enum_parsing_place place= NO_MATTER;
  bool field_found= (*from_field != not_found_field);
  bool upward_lookup= FALSE;

  /*
    If there are outer contexts (outer selects, but current select is
    not derived table or view) try to resolve this reference in the
    outer contexts.

    We treat each subselect as a separate namespace, so that different
    subselects may contain columns with the same names. The subselects
    are searched starting from the innermost.
  */
  Name_resolution_context *last_checked_context= context;
  Item **ref= (Item **) not_found_item;
4683 4684
  SELECT_LEX *current_sel= (SELECT_LEX *) thd->lex->current_select;
  Name_resolution_context *outer_context= 0;
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  SELECT_LEX *select= 0;
4686 4687 4688 4689
  /* Currently derived tables cannot be correlated */
  if (current_sel->master_unit()->first_select()->linkage !=
      DERIVED_TABLE_TYPE)
    outer_context= context->outer_context;
4690 4691 4692 4693
  for (;
       outer_context;
       outer_context= outer_context->outer_context)
  {
4694
    select= outer_context->select_lex;
4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724
    Item_subselect *prev_subselect_item=
      last_checked_context->select_lex->master_unit()->item;
    last_checked_context= outer_context;
    upward_lookup= TRUE;

    place= prev_subselect_item->parsing_place;
    /*
      If outer_field is set, field was already found by first call
      to find_field_in_tables(). Only need to find appropriate context.
    */
    if (field_found && outer_context->select_lex !=
        cached_table->select_lex)
      continue;
    /*
      In case of a view, find_field_in_tables() writes the pointer to
      the found view field into '*reference', in other words, it
      substitutes this Item_field with the found expression.
    */
    if (field_found || (*from_field= find_field_in_tables(thd, this,
                                          outer_context->
                                            first_name_resolution_table,
                                          outer_context->
                                            last_name_resolution_table,
                                          reference,
                                          IGNORE_EXCEPT_NON_UNIQUE,
                                          TRUE, TRUE)) !=
        not_found_field)
    {
      if (*from_field)
      {
4725 4726 4727 4728 4729 4730 4731 4732 4733 4734
        if (thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY &&
            select->cur_pos_in_select_list != UNDEF_POS)
        {
          /*
            As this is an outer field it should be added to the list of
            non aggregated fields of the outer select.
          */
          marker= select->cur_pos_in_select_list;
          select->non_agg_fields.push_back(this);
        }
4735 4736 4737 4738
        if (*from_field != view_ref_found)
        {
          prev_subselect_item->used_tables_cache|= (*from_field)->table->map;
          prev_subselect_item->const_item_cache= 0;
4739
          set_field(*from_field);
4740
          if (!last_checked_context->select_lex->having_fix_field &&
4741 4742
              select->group_list.elements &&
              (place == SELECT_LIST || place == IN_HAVING))
4743 4744 4745
          {
            Item_outer_ref *rf;
            /*
4746 4747 4748 4749 4750 4751 4752
              If an outer field is resolved in a grouping select then it
              is replaced for an Item_outer_ref object. Otherwise an
              Item_field object is used.
              The new Item_outer_ref object is saved in the inner_refs_list of
              the outer select. Here it is only created. It can be fixed only
              after the original field has been fixed and this is done in the
              fix_inner_refs() function.
4753
            */
4754 4755
            ;
            if (!(rf= new Item_outer_ref(context, this)))
4756
              return -1;
4757
            thd->change_item_tree(reference, rf);
4758
            select->inner_refs_list.push_back(rf);
4759
            rf->in_sum_func= thd->lex->in_sum_func;
4760
          }
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4761 4762 4763 4764 4765
          /*
            A reference is resolved to a nest level that's outer or the same as
            the nest level of the enclosing set function : adjust the value of
            max_arg_level for the function if it's needed.
          */
4766
          if (thd->lex->in_sum_func &&
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4767
              thd->lex->in_sum_func->nest_level >= select->nest_level)
4768
          {
4769
            Item::Type ref_type= (*reference)->type();
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            set_if_bigger(thd->lex->in_sum_func->max_arg_level,
                          select->nest_level);
            set_field(*from_field);
            fixed= 1;
            mark_as_dependent(thd, last_checked_context->select_lex,
                              context->select_lex, this,
4776 4777
                              ((ref_type == REF_ITEM ||
                                ref_type == FIELD_ITEM) ?
4778 4779 4780 4781 4782 4783
                               (Item_ident*) (*reference) : 0));
            return 0;
          }
        }
        else
        {
4784
          Item::Type ref_type= (*reference)->type();
4785 4786 4787 4788 4789 4790
          prev_subselect_item->used_tables_cache|=
            (*reference)->used_tables();
          prev_subselect_item->const_item_cache&=
            (*reference)->const_item();
          mark_as_dependent(thd, last_checked_context->select_lex,
                            context->select_lex, this,
4791
                            ((ref_type == REF_ITEM || ref_type == FIELD_ITEM) ?
4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806
                             (Item_ident*) (*reference) :
                             0));
          /*
            A reference to a view field had been found and we
            substituted it instead of this Item (find_field_in_tables
            does it by assigning the new value to *reference), so now
            we can return from this function.
          */
          return 0;
        }
      }
      break;
    }

    /* Search in SELECT and GROUP lists of the outer select. */
4807
    if (place != IN_WHERE && place != IN_ON)
4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845
    {
      if (!(ref= resolve_ref_in_select_and_group(thd, this, select)))
        return -1; /* Some error occurred (e.g. ambiguous names). */
      if (ref != not_found_item)
      {
        DBUG_ASSERT(*ref && (*ref)->fixed);
        prev_subselect_item->used_tables_cache|= (*ref)->used_tables();
        prev_subselect_item->const_item_cache&= (*ref)->const_item();
        break;
      }
    }

    /*
      Reference is not found in this select => this subquery depend on
      outer select (or we just trying to find wrong identifier, in this
      case it does not matter which used tables bits we set)
    */
    prev_subselect_item->used_tables_cache|= OUTER_REF_TABLE_BIT;
    prev_subselect_item->const_item_cache= 0;
  }

  DBUG_ASSERT(ref != 0);
  if (!*from_field)
    return -1;
  if (ref == not_found_item && *from_field == not_found_field)
  {
    if (upward_lookup)
    {
      // We can't say exactly what absent table or field
      my_error(ER_BAD_FIELD_ERROR, MYF(0), full_name(), thd->where);
    }
    else
    {
      /* Call find_field_in_tables only to report the error */
      find_field_in_tables(thd, this,
                           context->first_name_resolution_table,
                           context->last_name_resolution_table,
                           reference, REPORT_ALL_ERRORS,
4846
                           !any_privileges, TRUE);
4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866
    }
    return -1;
  }
  else if (ref != not_found_item)
  {
    Item *save;
    Item_ref *rf;

    /* Should have been checked in resolve_ref_in_select_and_group(). */
    DBUG_ASSERT(*ref && (*ref)->fixed);
    /*
      Here, a subset of actions performed by Item_ref::set_properties
      is not enough. So we pass ptr to NULL into Item_[direct]_ref
      constructor, so no initialization is performed, and call 
      fix_fields() below.
    */
    save= *ref;
    *ref= NULL;                             // Don't call set_properties()
    rf= (place == IN_HAVING ?
         new Item_ref(context, ref, (char*) table_name,
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4867
                      (char*) field_name, alias_name_used) :
4868
         (!select->group_list.elements ?
4869
         new Item_direct_ref(context, ref, (char*) table_name,
4870 4871 4872
                             (char*) field_name, alias_name_used) :
         new Item_outer_ref(context, ref, (char*) table_name,
                            (char*) field_name, alias_name_used)));
4873 4874 4875
    *ref= save;
    if (!rf)
      return -1;
4876 4877 4878 4879 4880 4881

    if (place != IN_HAVING && select->group_list.elements)
    {
      outer_context->select_lex->inner_refs_list.push_back((Item_outer_ref*)rf);
      ((Item_outer_ref*)rf)->in_sum_func= thd->lex->in_sum_func;
    }
4882 4883 4884 4885 4886 4887 4888 4889 4890 4891
    thd->change_item_tree(reference, rf);
    /*
      rf is Item_ref => never substitute other items (in this case)
      during fix_fields() => we can use rf after fix_fields()
    */
    DBUG_ASSERT(!rf->fixed);                // Assured by Item_ref()
    if (rf->fix_fields(thd, reference) || rf->check_cols(1))
      return -1;

    mark_as_dependent(thd, last_checked_context->select_lex,
4892
                      context->select_lex, rf,
4893
                      rf);
unknown's avatar
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4894

4895 4896 4897 4898 4899 4900
    return 0;
  }
  else
  {
    mark_as_dependent(thd, last_checked_context->select_lex,
                      context->select_lex,
4901
                      this, (Item_ident*)*reference);
4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924
    if (last_checked_context->select_lex->having_fix_field)
    {
      Item_ref *rf;
      rf= new Item_ref(context,
                       (cached_table->db[0] ? cached_table->db : 0),
                       (char*) cached_table->alias, (char*) field_name);
      if (!rf)
        return -1;
      thd->change_item_tree(reference, rf);
      /*
        rf is Item_ref => never substitute other items (in this case)
        during fix_fields() => we can use rf after fix_fields()
      */
      DBUG_ASSERT(!rf->fixed);                // Assured by Item_ref()
      if (rf->fix_fields(thd, reference) || rf->check_cols(1))
        return -1;
      return 0;
    }
  }
  return 1;
}


unknown's avatar
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4925
/**
4926 4927
  Resolve the name of a column reference.

unknown's avatar
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4928 4929 4930
  The method resolves the column reference represented by 'this' as a column
  present in one of: FROM clause, SELECT clause, GROUP BY clause of a query
  Q, or in outer queries that contain Q.
4931

unknown's avatar
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4932 4933
  The name resolution algorithm used is (where [T_j] is an optional table
  name that qualifies the column name):
4934

unknown's avatar
unknown committed
4935 4936 4937 4938 4939
  @code
    resolve_column_reference([T_j].col_ref_i)
    {
      search for a column or derived column named col_ref_i
      [in table T_j] in the FROM clause of Q;
4940

unknown's avatar
unknown committed
4941 4942
      if such a column is NOT found AND    // Lookup in outer queries.
         there are outer queries
4943
      {
unknown's avatar
unknown committed
4944
        for each outer query Q_k beginning from the inner-most one
4945
        {
unknown's avatar
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4946 4947
          search for a column or derived column named col_ref_i
          [in table T_j] in the FROM clause of Q_k;
4948

unknown's avatar
unknown committed
4949 4950 4951
          if such a column is not found
            Search for a column or derived column named col_ref_i
            [in table T_j] in the SELECT and GROUP clauses of Q_k.
4952 4953
        }
      }
unknown's avatar
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4954 4955
    }
  @endcode
4956 4957 4958 4959

    Notice that compared to Item_ref::fix_fields, here we first search the FROM
    clause, and then we search the SELECT and GROUP BY clauses.

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4960 4961 4962 4963 4964
  @param[in]     thd        current thread
  @param[in,out] reference  view column if this item was resolved to a
    view column

  @retval
4965
    TRUE  if error
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4966
  @retval
4967 4968 4969
    FALSE on success
*/

4970
bool Item_field::fix_fields(THD *thd, Item **reference)
unknown's avatar
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4971
{
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4972
  DBUG_ASSERT(fixed == 0);
4973 4974 4975
  Field *from_field= (Field *)not_found_field;
  bool outer_fixed= false;

4976
  if (!field)					// If field is not checked
unknown's avatar
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4977
  {
4978 4979 4980 4981 4982
    /*
      In case of view, find_field_in_tables() write pointer to view field
      expression to 'reference', i.e. it substitute that expression instead
      of this Item_field
    */
unknown's avatar
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4983 4984 4985
    if ((from_field= find_field_in_tables(thd, this,
                                          context->first_name_resolution_table,
                                          context->last_name_resolution_table,
4986
                                          reference,
4987 4988 4989
                                          thd->lex->use_only_table_context ?
                                            REPORT_ALL_ERRORS : 
                                            IGNORE_EXCEPT_NON_UNIQUE,
4990
                                          !any_privileges,
4991
                                          TRUE)) ==
4992
	not_found_field)
4993
    {
4994
      int ret;
unknown's avatar
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4995 4996 4997 4998
      /* Look up in current select's item_list to find aliased fields */
      if (thd->lex->current_select->is_item_list_lookup)
      {
        uint counter;
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4999
        enum_resolution_type resolution;
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5000 5001
        Item** res= find_item_in_list(this, thd->lex->current_select->item_list,
                                      &counter, REPORT_EXCEPT_NOT_FOUND,
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5002
                                      &resolution);
5003 5004
        if (!res)
          return 1;
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5005 5006
        if (resolution == RESOLVED_AGAINST_ALIAS)
          alias_name_used= TRUE;
5007
        if (res != (Item **)not_found_item)
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5008
        {
5009 5010 5011
          if ((*res)->type() == Item::FIELD_ITEM)
          {
            /*
5012 5013 5014 5015
              It's an Item_field referencing another Item_field in the select
              list.
              Use the field from the Item_field in the select list and leave
              the Item_field instance in place.
5016
            */
5017

5018
            Field *new_field= (*((Item_field**)res))->field;
5019

5020
            if (new_field == NULL)
5021 5022 5023 5024 5025 5026 5027
            {
              /* The column to which we link isn't valid. */
              my_error(ER_BAD_FIELD_ERROR, MYF(0), (*res)->name, 
                       current_thd->where);
              return(1);
            }

5028
            set_field(new_field);
5029 5030 5031 5032 5033 5034 5035 5036 5037
            return 0;
          }
          else
          {
            /*
              It's not an Item_field in the select list so we must make a new
              Item_ref to point to the Item in the select list and replace the
              Item_field created by the parser with the new Item_ref.
            */
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5038
            Item_ref *rf= new Item_ref(context, db_name,table_name,field_name);
5039 5040
            if (!rf)
              return 1;
5041 5042 5043
            bool ret= rf->fix_fields(thd, (Item **) &rf) || rf->check_cols(1);
            if (ret)
              return TRUE;
5044 5045 5046 5047 5048
           
            SELECT_LEX *select= thd->lex->current_select;
            thd->change_item_tree(reference,
                                  select->parsing_place == IN_GROUP_BY && 
				  alias_name_used  ?  *rf->ref : rf);
5049 5050

            return FALSE;
5051
          }
5052 5053
        }
      }
5054 5055 5056
      if ((ret= fix_outer_field(thd, &from_field, reference)) < 0)
        goto error;
      outer_fixed= TRUE;
5057 5058
      if (!ret)
        goto mark_non_agg_field;
5059
    }
5060
    else if (!from_field)
5061
      goto error;
5062

5063
    if (!outer_fixed && cached_table && cached_table->select_lex &&
5064
        context->select_lex &&
5065
        cached_table->select_lex != context->select_lex &&
5066
        !context->select_lex->is_merged_child_of(cached_table->select_lex) &&
5067
        is_outer_table(cached_table, context->select_lex))
5068 5069 5070 5071 5072
    {
      int ret;
      if ((ret= fix_outer_field(thd, &from_field, reference)) < 0)
        goto error;
      outer_fixed= 1;
5073 5074
      if (!ret)
        goto mark_non_agg_field;
5075 5076
    }

unknown's avatar
VIEW  
unknown committed
5077 5078 5079 5080
    /*
      if it is not expression from merged VIEW we will set this field.

      We can leave expression substituted from view for next PS/SP rexecution
5081
      (i.e. do not register this substitution for reverting on cleanup()
unknown's avatar
VIEW  
unknown committed
5082
      (register_item_tree_changing())), because this subtree will be
5083
      fix_field'ed during setup_tables()->setup_underlying() (i.e. before
unknown's avatar
VIEW  
unknown committed
5084 5085 5086 5087 5088
      all other expressions of query, and references on tables which do
      not present in query will not make problems.

      Also we suppose that view can't be changed during PS/SP life.
    */
5089 5090 5091 5092
    if (from_field == view_ref_found)
      return FALSE;

    set_field(from_field);
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5093 5094 5095 5096 5097
    if (thd->lex->in_sum_func &&
        thd->lex->in_sum_func->nest_level == 
        thd->lex->current_select->nest_level)
      set_if_bigger(thd->lex->in_sum_func->max_arg_level,
                    thd->lex->current_select->nest_level);
unknown's avatar
unknown committed
5098
  }
5099
  else if (thd->mark_used_columns != MARK_COLUMNS_NONE)
5100
  {
5101
    TABLE *table= field->table;
5102 5103
    MY_BITMAP *current_bitmap, *other_bitmap;
    if (thd->mark_used_columns == MARK_COLUMNS_READ)
5104
    {
5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118
      current_bitmap= table->read_set;
      other_bitmap=   table->write_set;
    }
    else
    {
      current_bitmap= table->write_set;
      other_bitmap=   table->read_set;
    }
    if (!bitmap_fast_test_and_set(current_bitmap, field->field_index))
    {
      if (!bitmap_is_set(other_bitmap, field->field_index))
      {
        /* First usage of column */
        table->used_fields++;                     // Used to optimize loops
5119
        /* purecov: begin inspected */
5120
        table->covering_keys.intersect(field->part_of_key);
5121
        /* purecov: end */
5122
      }
5123
    }
5124
  }
unknown's avatar
VIEW  
unknown committed
5125 5126 5127 5128
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (any_privileges)
  {
    char *db, *tab;
5129 5130
    db= cached_table->get_db_name();
    tab= cached_table->get_table_name();
unknown's avatar
VIEW  
unknown committed
5131 5132 5133 5134
    if (!(have_privileges= (get_column_grant(thd, &field->table->grant,
                                             db, tab, field_name) &
                            VIEW_ANY_ACL)))
    {
5135
      my_error(ER_COLUMNACCESS_DENIED_ERROR, MYF(0),
5136 5137
               "ANY", thd->security_ctx->priv_user,
               thd->security_ctx->host_or_ip, field_name, tab);
5138
      goto error;
unknown's avatar
VIEW  
unknown committed
5139 5140 5141
    }
  }
#endif
5142
  fixed= 1;
5143 5144 5145 5146 5147 5148 5149
  if (thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY &&
      !outer_fixed && !thd->lex->in_sum_func &&
      thd->lex->current_select->cur_pos_in_select_list != UNDEF_POS)
  {
    thd->lex->current_select->non_agg_fields.push_back(this);
    marker= thd->lex->current_select->cur_pos_in_select_list;
  }
5150 5151 5152 5153 5154 5155 5156 5157
mark_non_agg_field:
  if (fixed && thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY)
  {
    /*
      Mark selects according to presence of non aggregated fields.
      Fields from outer selects added to the aggregate function
      outer_fields list as its unknown at the moment whether it's
      aggregated or not.
5158 5159 5160 5161
      We're using either the select lex of the cached table (if present)
      or the field's resolution context. context->select_lex is 
      safe for use because it's either the SELECT we want to use 
      (the current level) or a stub added by non-SELECT queries.
5162
    */
5163 5164
    SELECT_LEX *select_lex= cached_table ? 
      cached_table->select_lex : context->select_lex;
5165
    if (!thd->lex->in_sum_func)
5166
      select_lex->set_non_agg_field_used(true);
5167 5168 5169 5170 5171 5172
    else
    {
      if (outer_fixed)
        thd->lex->in_sum_func->outer_fields.push_back(this);
      else if (thd->lex->in_sum_func->nest_level !=
          thd->lex->current_select->nest_level)
5173
        select_lex->set_non_agg_field_used(true);
5174 5175
    }
  }
5176
  return FALSE;
5177 5178 5179 5180

error:
  context->process_error(thd);
  return TRUE;
unknown's avatar
unknown committed
5181 5182
}

5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197
/*
  @brief
  Mark virtual columns as used in a partitioning expression 
*/

bool Item_field::vcol_in_partition_func_processor(uchar *int_arg)
{
  DBUG_ASSERT(fixed);
  if (field->vcol_info)
  {
    field->vcol_info->mark_as_in_partitioning_expr();
  }
  return FALSE;
}

5198 5199 5200 5201 5202 5203 5204 5205

Item *Item_field::safe_charset_converter(CHARSET_INFO *tocs)
{
  no_const_subst= 1;
  return Item::safe_charset_converter(tocs);
}


unknown's avatar
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5206 5207
void Item_field::cleanup()
{
unknown's avatar
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5208
  DBUG_ENTER("Item_field::cleanup");
unknown's avatar
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5209
  Item_ident::cleanup();
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5210
  depended_from= NULL;
5211 5212
  /*
    Even if this object was created by direct link to field in setup_wild()
unknown's avatar
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5213
    it will be linked correctly next time by name of field and table alias.
5214 5215
    I.e. we can drop 'field'.
   */
5216
  field= result_field= 0;
5217
  item_equal= NULL;
5218
  null_value= FALSE;
5219
  DBUG_VOID_RETURN;
5220
}
unknown's avatar
unknown committed
5221

unknown's avatar
unknown committed
5222 5223
/**
  Find a field among specified multiple equalities.
unknown's avatar
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5224

unknown's avatar
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5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237
  The function first searches the field among multiple equalities
  of the current level (in the cond_equal->current_level list).
  If it fails, it continues searching in upper levels accessed
  through a pointer cond_equal->upper_levels.
  The search terminates as soon as a multiple equality containing 
  the field is found. 

  @param cond_equal   reference to list of multiple equalities where
                      the field (this object) is to be looked for

  @return
    - First Item_equal containing the field, if success
    - 0, otherwise
unknown's avatar
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5238
*/
unknown's avatar
unknown committed
5239

unknown's avatar
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5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260
Item_equal *Item_field::find_item_equal(COND_EQUAL *cond_equal)
{
  Item_equal *item= 0;
  while (cond_equal)
  {
    List_iterator_fast<Item_equal> li(cond_equal->current_level);
    while ((item= li++))
    {
      if (item->contains(field))
        return item;
    }
    /* 
      The field is not found in any of the multiple equalities
      of the current level. Look for it in upper levels
    */
    cond_equal= cond_equal->upper_levels;
  }
  return 0;
}


unknown's avatar
unknown committed
5261
/**
5262
  Check whether a field item can be substituted for an equal item
5263

5264 5265 5266
  @details
  The function checks whether a substitution of a field item for
  an equal item is valid.
5267

Igor Babaev's avatar
Igor Babaev committed
5268
  @param arg   *arg != NULL <-> the field is in the context
5269
               where substitution for an equal item is valid
unknown's avatar
unknown committed
5270 5271

  @note
5272
    The following statement is not always true:
unknown's avatar
unknown committed
5273
  @n
5274
    x=y => F(x)=F(x/y).
unknown's avatar
unknown committed
5275
  @n
5276
    This means substitution of an item for an equal item not always
unknown's avatar
unknown committed
5277 5278 5279 5280 5281
    yields an equavalent condition. Here's an example:
    @code
    'a'='a '
    (LENGTH('a')=1) != (LENGTH('a ')=2)
  @endcode
5282 5283
    Such a substitution is surely valid if either the substituted
    field is not of a STRING type or if it is an argument of
unknown's avatar
unknown committed
5284
    a comparison predicate.
5285

unknown's avatar
unknown committed
5286
  @retval
5287
    TRUE   substitution is valid
unknown's avatar
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5288
  @retval
5289 5290 5291
    FALSE  otherwise
*/

5292
bool Item_field::subst_argument_checker(uchar **arg)
5293
{
Igor Babaev's avatar
Igor Babaev committed
5294 5295 5296 5297
  return *arg &&
         (*arg == (uchar *) Item::ANY_SUBST ||
          result_type() != STRING_RESULT || 
          (field->flags & BINARY_FLAG));
5298 5299 5300
}


5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318
/**
  Convert a numeric value to a zero-filled string

  @param[in,out]  item   the item to operate on
  @param          field  The field that this value is equated to

  This function converts a numeric value to a string. In this conversion
  the zero-fill flag of the field is taken into account.
  This is required so the resulting string value can be used instead of
  the field reference when propagating equalities.
*/

static void convert_zerofill_number_to_string(Item **item, Field_num *field)
{
  char buff[MAX_FIELD_WIDTH],*pos;
  String tmp(buff,sizeof(buff), field->charset()), *res;

  res= (*item)->val_str(&tmp);
5319 5320 5321 5322 5323 5324 5325 5326
  if ((*item)->is_null())
    *item= new Item_null();
  else
  {
    field->prepend_zeros(res);
    pos= (char *) sql_strmake (res->ptr(), res->length());
    *item= new Item_string(pos, res->length(), field->charset());
  }
5327 5328 5329
}


unknown's avatar
unknown committed
5330
/**
5331
  Set a pointer to the multiple equality the field reference belongs to
unknown's avatar
unknown committed
5332
  (if any).
unknown's avatar
unknown committed
5333

unknown's avatar
unknown committed
5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345
  The function looks for a multiple equality containing the field item
  among those referenced by arg.
  In the case such equality exists the function does the following.
  If the found multiple equality contains a constant, then the field
  reference is substituted for this constant, otherwise it sets a pointer
  to the multiple equality in the field item.


  @param arg    reference to list of multiple equalities where
                the field (this object) is to be looked for

  @note
unknown's avatar
unknown committed
5346
    This function is supposed to be called as a callback parameter in calls
unknown's avatar
unknown committed
5347
    of the compile method.
unknown's avatar
unknown committed
5348

unknown's avatar
unknown committed
5349 5350 5351
  @return
    - pointer to the replacing constant item, if the field item was substituted
    - pointer to the field item, otherwise.
unknown's avatar
unknown committed
5352
*/
unknown's avatar
unknown committed
5353

5354
Item *Item_field::equal_fields_propagator(uchar *arg)
unknown's avatar
unknown committed
5355 5356 5357 5358 5359 5360 5361
{
  if (no_const_subst)
    return this;
  item_equal= find_item_equal((COND_EQUAL *) arg);
  Item *item= 0;
  if (item_equal)
    item= item_equal->get_const();
5362 5363 5364 5365 5366 5367 5368 5369 5370
  /*
    Disable const propagation for items used in different comparison contexts.
    This must be done because, for example, Item_hex_string->val_int() is not
    the same as (Item_hex_string->val_str() in BINARY column)->val_int().
    We cannot simply disable the replacement in a particular context (
    e.g. <bin_col> = <int_col> AND <bin_col> = <hex_string>) since
    Items don't know the context they are in and there are functions like 
    IF (<hex_string>, 'yes', 'no').
  */
5371
  if (!item || !has_compatible_context(item))
unknown's avatar
unknown committed
5372
    item= this;
5373 5374
  else if (field && (field->flags & ZEROFILL_FLAG) && IS_NUM(field->type()))
  {
Sergei Golubchik's avatar
Sergei Golubchik committed
5375
    if (item && (cmp_context == STRING_RESULT || cmp_context == IMPOSSIBLE_RESULT))
5376 5377 5378 5379
      convert_zerofill_number_to_string(&item, (Field_num *)field);
    else
      item= this;
  }
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unknown committed
5380 5381 5382 5383
  return item;
}


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5384 5385 5386 5387
/**
  Mark the item to not be part of substitution if it's not a binary item.

  See comments in Arg_comparator::set_compare_func() for details.
5388 5389
*/

5390
bool Item_field::set_no_const_sub(uchar *arg)
5391 5392 5393
{
  if (field->charset() != &my_charset_bin)
    no_const_subst=1;
5394
  return FALSE;
5395 5396 5397
}


unknown's avatar
unknown committed
5398
/**
unknown's avatar
unknown committed
5399
  Replace an Item_field for an equal Item_field that evaluated earlier
unknown's avatar
unknown committed
5400
  (if any).
unknown's avatar
unknown committed
5401

Igor Babaev's avatar
Igor Babaev committed
5402 5403
  If this->item_equal points to some item and coincides with arg then
  the function returns a pointer to an item that is taken from
unknown's avatar
unknown committed
5404 5405 5406 5407 5408 5409 5410
  the very beginning of the item_equal list which the Item_field
  object refers to (belongs to) unless item_equal contains  a constant
  item. In this case the function returns this constant item, 
  (if the substitution does not require conversion).   
  If the Item_field object does not refer any Item_equal object
  'this' is returned .

Igor Babaev's avatar
Igor Babaev committed
5411
  @param arg   NULL or points to so some item of the Item_equal type  
unknown's avatar
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5412 5413 5414


  @note
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5415
    This function is supposed to be called as a callback parameter in calls
5416
    of the transformer method.
unknown's avatar
unknown committed
5417

unknown's avatar
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5418 5419 5420 5421
  @return
    - pointer to a replacement Item_field if there is a better equal item or
      a pointer to a constant equal item;
    - this - otherwise.
unknown's avatar
unknown committed
5422 5423
*/

5424
Item *Item_field::replace_equal_field(uchar *arg)
unknown's avatar
unknown committed
5425
{
5426 5427
  REPLACE_EQUAL_FIELD_ARG* param= (REPLACE_EQUAL_FIELD_ARG*)arg;
  if (item_equal && item_equal == param->item_equal)
unknown's avatar
unknown committed
5428
  {
5429 5430 5431
    Item *const_item= item_equal->get_const();
    if (const_item)
    {
5432
      if (!has_compatible_context(const_item))
5433 5434 5435
        return this;
      return const_item;
    }
5436 5437
    Item_field *subst= 
      (Item_field *)(item_equal->get_first(param->context_tab, this));
5438 5439
    if (subst)
      subst= (Item_field *) (subst->real_item());
Igor Babaev's avatar
Igor Babaev committed
5440
    if (subst && !field->eq(subst->field))
unknown's avatar
unknown committed
5441
      return subst;
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unknown committed
5442
  }
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5443
  return this;
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5444
}
unknown's avatar
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5445

5446

unknown's avatar
unknown committed
5447
void Item::init_make_field(Send_field *tmp_field,
5448
			   enum enum_field_types field_type_arg)
5449
{
5450
  char *empty_name= (char*) "";
5451
  tmp_field->db_name=		empty_name;
5452 5453 5454 5455
  tmp_field->org_table_name=	empty_name;
  tmp_field->org_col_name=	empty_name;
  tmp_field->table_name=	empty_name;
  tmp_field->col_name=		name;
5456
  tmp_field->charsetnr=         collation.collation->number;
5457
  tmp_field->flags=             (maybe_null ? 0 : NOT_NULL_FLAG) | 
5458
                                (my_binary_compare(charset_for_protocol()) ?
5459
                                 BINARY_FLAG : 0);
5460
  tmp_field->type=              field_type_arg;
unknown's avatar
unknown committed
5461 5462
  tmp_field->length=max_length;
  tmp_field->decimals=decimals;
5463 5464
  if (unsigned_flag)
    tmp_field->flags |= UNSIGNED_FLAG;
unknown's avatar
unknown committed
5465 5466
}

5467
void Item::make_field(Send_field *tmp_field)
unknown's avatar
unknown committed
5468
{
5469
  init_make_field(tmp_field, field_type());
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5470 5471 5472
}


5473
enum_field_types Item::string_field_type() const
5474
{
unknown's avatar
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5475
  enum_field_types f_type= MYSQL_TYPE_VAR_STRING;
5476
  if (max_length >= 16777216)
unknown's avatar
unknown committed
5477
    f_type= MYSQL_TYPE_LONG_BLOB;
5478
  else if (max_length >= 65536)
unknown's avatar
unknown committed
5479
    f_type= MYSQL_TYPE_MEDIUM_BLOB;
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5480
  return f_type;
5481 5482 5483 5484 5485 5486
}


void Item_empty_string::make_field(Send_field *tmp_field)
{
  init_make_field(tmp_field, string_field_type());
5487 5488
}

unknown's avatar
unknown committed
5489

5490
enum_field_types Item::field_type() const
unknown's avatar
unknown committed
5491
{
5492
  switch (result_type()) {
5493
  case STRING_RESULT:  return string_field_type();
5494 5495 5496
  case INT_RESULT:     return MYSQL_TYPE_LONGLONG;
  case DECIMAL_RESULT: return MYSQL_TYPE_NEWDECIMAL;
  case REAL_RESULT:    return MYSQL_TYPE_DOUBLE;
unknown's avatar
unknown committed
5497
  case ROW_RESULT:
Sergei Golubchik's avatar
Sergei Golubchik committed
5498
  case TIME_RESULT:
5499
  case IMPOSSIBLE_RESULT:
unknown's avatar
unknown committed
5500
    DBUG_ASSERT(0);
5501 5502
    return MYSQL_TYPE_VARCHAR;
  }
Sergei Golubchik's avatar
Sergei Golubchik committed
5503
  return MYSQL_TYPE_VARCHAR;
unknown's avatar
unknown committed
5504 5505
}

5506

5507
String *Item::check_well_formed_result(String *str, bool send_error)
5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521
{
  /* Check whether we got a well-formed string */
  CHARSET_INFO *cs= str->charset();
  int well_formed_error;
  uint wlen= cs->cset->well_formed_len(cs,
                                       str->ptr(), str->ptr() + str->length(),
                                       str->length(), &well_formed_error);
  if (wlen < str->length())
  {
    THD *thd= current_thd;
    char hexbuf[7];
    uint diff= str->length() - wlen;
    set_if_smaller(diff, 3);
    octet2hex(hexbuf, str->ptr() + wlen, diff);
5522 5523 5524 5525 5526 5527 5528 5529
    if (send_error)
    {
      my_error(ER_INVALID_CHARACTER_STRING, MYF(0),
               cs->csname,  hexbuf);
      return 0;
    }
    if ((thd->variables.sql_mode &
         (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES)))
5530 5531 5532 5533 5534 5535 5536 5537
    {
      null_value= 1;
      str= 0;
    }
    else
    {
      str->length(wlen);
    }
Marc Alff's avatar
Marc Alff committed
5538
    push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_INVALID_CHARACTER_STRING,
5539 5540 5541 5542 5543
                        ER(ER_INVALID_CHARACTER_STRING), cs->csname, hexbuf);
  }
  return str;
}

unknown's avatar
unknown committed
5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586
/*
  Compare two items using a given collation
  
  SYNOPSIS
    eq_by_collation()
    item               item to compare with
    binary_cmp         TRUE <-> compare as binaries
    cs                 collation to use when comparing strings

  DESCRIPTION
    This method works exactly as Item::eq if the collation cs coincides with
    the collation of the compared objects. Otherwise, first the collations that
    differ from cs are replaced for cs and then the items are compared by
    Item::eq. After the comparison the original collations of items are
    restored.

  RETURN
    1    compared items has been detected as equal   
    0    otherwise
*/

bool Item::eq_by_collation(Item *item, bool binary_cmp, CHARSET_INFO *cs)
{
  CHARSET_INFO *save_cs= 0;
  CHARSET_INFO *save_item_cs= 0;
  if (collation.collation != cs)
  {
    save_cs= collation.collation;
    collation.collation= cs;
  }
  if (item->collation.collation != cs)
  {
    save_item_cs= item->collation.collation;
    item->collation.collation= cs;
  }
  bool res= eq(item, binary_cmp);
  if (save_cs)
    collation.collation= save_cs;
  if (save_item_cs)
    item->collation.collation= save_item_cs;
  return res;
}  

5587

unknown's avatar
unknown committed
5588 5589
/**
  Create a field to hold a string value from an item.
5590

5591
  If too_big_for_varchar() create a blob @n
unknown's avatar
unknown committed
5592 5593
  If max_length > 0 create a varchar @n
  If max_length == 0 create a CHAR(0) 
5594

unknown's avatar
unknown committed
5595
  @param table		Table for which the field is created
5596 5597 5598 5599
*/

Field *Item::make_string_field(TABLE *table)
{
unknown's avatar
unknown committed
5600
  Field *field;
5601
  DBUG_ASSERT(collation.collation);
5602 5603 5604 5605
  /* 
    Note: the following check is repeated in 
    subquery_types_allow_materialization():
  */
5606
  if (too_big_for_varchar())
unknown's avatar
unknown committed
5607
    field= new Field_blob(max_length, maybe_null, name,
5608
                          collation.collation, TRUE);
5609
  /* Item_type_holder holds the exact type, do not change it */
5610
  else if (max_length > 0 &&
5611
      (type() != Item::TYPE_HOLDER || field_type() != MYSQL_TYPE_STRING))
unknown's avatar
unknown committed
5612
    field= new Field_varstring(max_length, maybe_null, name, table->s,
5613
                               collation.collation);
unknown's avatar
unknown committed
5614 5615 5616 5617 5618 5619
  else
    field= new Field_string(max_length, maybe_null, name,
                            collation.collation);
  if (field)
    field->init(table);
  return field;
5620 5621 5622
}


unknown's avatar
unknown committed
5623 5624
/**
  Create a field based on field_type of argument.
5625 5626

  For now, this is only used to create a field for
unknown's avatar
unknown committed
5627
  IFNULL(x,something) and time functions
5628

unknown's avatar
unknown committed
5629 5630 5631 5632
  @retval
    NULL  error
  @retval
    \#    Created field
5633 5634
*/

unknown's avatar
unknown committed
5635
Field *Item::tmp_table_field_from_field_type(TABLE *table, bool fixed_length)
5636
{
5637 5638 5639 5640
  /*
    The field functions defines a field to be not null if null_ptr is not 0
  */
  uchar *null_ptr= maybe_null ? (uchar*) "" : 0;
unknown's avatar
unknown committed
5641
  Field *field;
5642 5643

  switch (field_type()) {
5644
  case MYSQL_TYPE_DECIMAL:
unknown's avatar
unknown committed
5645
  case MYSQL_TYPE_NEWDECIMAL:
5646
    field= Field_new_decimal::create_from_item(this);
unknown's avatar
unknown committed
5647
    break;
5648
  case MYSQL_TYPE_TINY:
5649
    field= new Field_tiny((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
5650 5651
			  name, 0, unsigned_flag);
    break;
5652
  case MYSQL_TYPE_SHORT:
5653
    field= new Field_short((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
5654 5655
			   name, 0, unsigned_flag);
    break;
5656
  case MYSQL_TYPE_LONG:
5657
    field= new Field_long((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
5658 5659
			  name, 0, unsigned_flag);
    break;
5660 5661
#ifdef HAVE_LONG_LONG
  case MYSQL_TYPE_LONGLONG:
5662
    field= new Field_longlong((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
5663 5664
			      name, 0, unsigned_flag);
    break;
5665
#endif
5666
  case MYSQL_TYPE_FLOAT:
5667
    field= new Field_float((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
5668 5669
			   name, decimals, 0, unsigned_flag);
    break;
5670
  case MYSQL_TYPE_DOUBLE:
5671
    field= new Field_double((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
5672 5673
			    name, decimals, 0, unsigned_flag);
    break;
5674
  case MYSQL_TYPE_NULL:
5675
    field= new Field_null((uchar*) 0, max_length, Field::NONE,
unknown's avatar
unknown committed
5676 5677
			  name, &my_charset_bin);
    break;
5678
  case MYSQL_TYPE_INT24:
5679
    field= new Field_medium((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
5680 5681
			    name, 0, unsigned_flag);
    break;
5682
  case MYSQL_TYPE_NEWDATE:
5683
  case MYSQL_TYPE_DATE:
5684
    field= new Field_newdate(0, null_ptr, 0, Field::NONE, name, &my_charset_bin);
unknown's avatar
unknown committed
5685
    break;
5686
  case MYSQL_TYPE_TIME:
5687 5688
    field= new_Field_time(0, null_ptr, 0, Field::NONE, name,
                              decimals, &my_charset_bin);
unknown's avatar
unknown committed
5689
    break;
5690
  case MYSQL_TYPE_TIMESTAMP:
5691 5692
    field= new_Field_timestamp(0, null_ptr, 0,
                               Field::NONE, name, 0, decimals, &my_charset_bin);
unknown's avatar
unknown committed
5693
    break;
5694
  case MYSQL_TYPE_DATETIME:
5695 5696
    field= new_Field_datetime(0, null_ptr, 0, Field::NONE, name,
                              decimals, &my_charset_bin);
unknown's avatar
unknown committed
5697
    break;
5698
  case MYSQL_TYPE_YEAR:
5699
    field= new Field_year((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
5700 5701
			  name);
    break;
unknown's avatar
unknown committed
5702
  case MYSQL_TYPE_BIT:
5703
    field= new Field_bit_as_char(NULL, max_length, null_ptr, 0,
unknown's avatar
unknown committed
5704 5705
                                 Field::NONE, name);
    break;
5706
  default:
5707
    /* This case should never be chosen */
5708 5709
    DBUG_ASSERT(0);
    /* If something goes awfully wrong, it's better to get a string than die */
unknown's avatar
unknown committed
5710
  case MYSQL_TYPE_STRING:
5711
    if (fixed_length && !too_big_for_varchar())
unknown's avatar
unknown committed
5712 5713 5714 5715 5716 5717
    {
      field= new Field_string(max_length, maybe_null, name,
                              collation.collation);
      break;
    }
    /* Fall through to make_string_field() */
5718 5719
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
5720
  case MYSQL_TYPE_VAR_STRING:
5721
  case MYSQL_TYPE_VARCHAR:
5722
    return make_string_field(table);
5723 5724 5725 5726
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
5727
    if (this->type() == Item::TYPE_HOLDER)
unknown's avatar
unknown committed
5728 5729
      field= new Field_blob(max_length, maybe_null, name, collation.collation,
                            1);
5730
    else
unknown's avatar
unknown committed
5731
      field= new Field_blob(max_length, maybe_null, name, collation.collation);
5732
    break;					// Blob handled outside of case
5733
#ifdef HAVE_SPATIAL
unknown's avatar
unknown committed
5734
  case MYSQL_TYPE_GEOMETRY:
5735 5736
    field= new Field_geom(max_length, maybe_null,
                          name, table->s, get_geometry_type());
5737
#endif /* HAVE_SPATIAL */
5738
  }
unknown's avatar
unknown committed
5739 5740 5741
  if (field)
    field->init(table);
  return field;
5742 5743
}

5744

5745 5746
/* ARGSUSED */
void Item_field::make_field(Send_field *tmp_field)
unknown's avatar
unknown committed
5747
{
5748
  field->make_field(tmp_field);
5749
  DBUG_ASSERT(tmp_field->table_name != 0);
5750 5751
  if (name)
    tmp_field->col_name=name;			// Use user supplied name
5752 5753 5754 5755
  if (table_name)
    tmp_field->table_name= table_name;
  if (db_name)
    tmp_field->db_name= db_name;
unknown's avatar
unknown committed
5756 5757
}

5758

unknown's avatar
unknown committed
5759
/**
unknown's avatar
unknown committed
5760
  Save a field value in another field
unknown's avatar
unknown committed
5761

unknown's avatar
unknown committed
5762 5763 5764 5765
  @param from             Field to take the value from
  @param [out] null_value Pointer to the null_value flag to set
  @param to               Field to save the value in
  @param no_conversions   How to deal with NULL value
unknown's avatar
unknown committed
5766

unknown's avatar
unknown committed
5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781
  @details
  The function takes the value of the field 'from' and, if this value
  is not null, it saves in the field 'to' setting off the flag referenced
  by 'null_value'. Otherwise this flag is set on and field 'to' is
  also set to null possibly with conversion.

  @note
  This function is used by the functions Item_field::save_in_field,
  Item_field::save_org_in_field and Item_ref::save_in_field

  @retval FALSE OK
  @retval TRUE  Error

*/

Sergey Petrunya's avatar
Sergey Petrunya committed
5782
static int save_field_in_field(Field *from, bool *null_value,
unknown's avatar
unknown committed
5783
                               Field *to, bool no_conversions)
unknown's avatar
unknown committed
5784
{
5785
  int res;
unknown's avatar
unknown committed
5786 5787
  DBUG_ENTER("save_field_in_field");
  if (from->is_null())
unknown's avatar
unknown committed
5788
  {
unknown's avatar
unknown committed
5789 5790
    (*null_value)= 1;
    DBUG_RETURN(set_field_to_null_with_conversions(to, no_conversions));
unknown's avatar
unknown committed
5791
  }
5792 5793 5794 5795 5796
  to->set_notnull();

  /*
    If we're setting the same field as the one we're reading from there's 
    nothing to do. This can happen in 'SET x = x' type of scenarios.
unknown's avatar
unknown committed
5797 5798
  */
  if (to == from)
unknown's avatar
unknown committed
5799
  {
unknown's avatar
unknown committed
5800 5801
    (*null_value)= 0;
    DBUG_RETURN(0);
unknown's avatar
unknown committed
5802
  }
5803

unknown's avatar
unknown committed
5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822
  res= field_conv(to, from);
  (*null_value)= 0;
  DBUG_RETURN(res);
}


/**
  Set a field's value from a item.
*/

void Item_field::save_org_in_field(Field *to)
{
  save_field_in_field(field, &null_value, to, TRUE);
}


int Item_field::save_in_field(Field *to, bool no_conversions)
{
  return save_field_in_field(result_field, &null_value, to, no_conversions);
unknown's avatar
unknown committed
5823 5824
}

5825

unknown's avatar
unknown committed
5826 5827
/**
  Store null in field.
unknown's avatar
unknown committed
5828

unknown's avatar
unknown committed
5829 5830
  This is used on INSERT.
  Allow NULL to be inserted in timestamp and auto_increment values.
unknown's avatar
unknown committed
5831

unknown's avatar
unknown committed
5832
  @param field		Field where we want to store NULL
unknown's avatar
unknown committed
5833

unknown's avatar
unknown committed
5834 5835 5836 5837 5838
  @retval
    0   ok
  @retval
    1   Field doesn't support NULL values and can't handle 'field = NULL'
*/
unknown's avatar
unknown committed
5839

unknown's avatar
unknown committed
5840
int Item_null::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
5841
{
5842
  return set_field_to_null_with_conversions(field, no_conversions);
unknown's avatar
unknown committed
5843 5844 5845
}


unknown's avatar
unknown committed
5846 5847
/**
  Store null in field.
5848

unknown's avatar
unknown committed
5849
  @param field		Field where we want to store NULL
5850

unknown's avatar
unknown committed
5851
  @retval
unknown's avatar
unknown committed
5852
    0	 OK
unknown's avatar
unknown committed
5853
  @retval
5854
    1	 Field doesn't support NULL values
unknown's avatar
unknown committed
5855
*/
5856

unknown's avatar
unknown committed
5857
int Item_null::save_safe_in_field(Field *field)
unknown's avatar
unknown committed
5858 5859 5860 5861 5862
{
  return set_field_to_null(field);
}


5863 5864 5865
/*
  This implementation can lose str_value content, so if the
  Item uses str_value to store something, it should
5866 5867
  reimplement it's ::save_in_field() as Item_string, for example, does.

Sergei Golubchik's avatar
Sergei Golubchik committed
5868
  Note: all Item_XXX::val_str(str) methods must NOT assume that
5869
  str != str_value. For example, see fix for bug #44743.
5870 5871
*/

unknown's avatar
unknown committed
5872
int Item::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
5873
{
5874
  int error;
5875
  if (result_type() == STRING_RESULT)
unknown's avatar
unknown committed
5876 5877
  {
    String *result;
5878
    CHARSET_INFO *cs= collation.collation;
unknown's avatar
unknown committed
5879
    char buff[MAX_FIELD_WIDTH];		// Alloc buffer for small columns
unknown's avatar
unknown committed
5880
    str_value.set_quick(buff, sizeof(buff), cs);
unknown's avatar
unknown committed
5881 5882
    result=val_str(&str_value);
    if (null_value)
5883
    {
unknown's avatar
unknown committed
5884
      str_value.set_quick(0, 0, cs);
5885
      return set_field_to_null_with_conversions(field, no_conversions);
5886
    }
5887 5888 5889

    /* NOTE: If null_value == FALSE, "result" must be not NULL.  */

unknown's avatar
unknown committed
5890
    field->set_notnull();
5891
    error=field->store(result->ptr(),result->length(),cs);
5892
    str_value.set_quick(0, 0, cs);
unknown's avatar
unknown committed
5893 5894 5895
  }
  else if (result_type() == REAL_RESULT)
  {
5896
    double nr= val_real();
unknown's avatar
unknown committed
5897
    if (null_value)
5898
      return set_field_to_null_with_conversions(field, no_conversions);
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unknown committed
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    field->set_notnull();
5900
    error=field->store(nr);
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5901
  }
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5902 5903 5904 5905 5906
  else if (result_type() == DECIMAL_RESULT)
  {
    my_decimal decimal_value;
    my_decimal *value= val_decimal(&decimal_value);
    if (null_value)
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5907
      return set_field_to_null_with_conversions(field, no_conversions);
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    field->set_notnull();
    error=field->store_decimal(value);
  }
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  else
  {
    longlong nr=val_int();
    if (null_value)
5915
      return set_field_to_null_with_conversions(field, no_conversions);
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5916
    field->set_notnull();
5917
    error=field->store(nr, unsigned_flag);
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5918
  }
5919
  return error ? error : (field->table->in_use->is_error() ? 1 : 0);
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}

5922

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int Item_string::save_in_field(Field *field, bool no_conversions)
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{
  String *result;
  result=val_str(&str_value);
5927
  return save_str_value_in_field(field, result);
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}

5930

5931 5932
static int save_int_value_in_field (Field *field, longlong nr, 
                                    bool null_value, bool unsigned_flag)
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{
  if (null_value)
    return set_field_to_null(field);
  field->set_notnull();
5937
  return field->store(nr, unsigned_flag);
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}

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5940

5941 5942 5943 5944 5945 5946
int Item_int::save_in_field(Field *field, bool no_conversions)
{
  return save_int_value_in_field (field, val_int(), null_value, unsigned_flag);
}


5947 5948 5949 5950 5951 5952 5953 5954
void Item_datetime::set(longlong packed)
{
  unpack_time(packed, &ltime);
}

int Item_datetime::save_in_field(Field *field, bool no_conversions)
{
  field->set_notnull();
5955
  return field->store_time_dec(&ltime, decimals);
5956 5957 5958 5959 5960 5961 5962
}

longlong Item_datetime::val_int()
{
  return TIME_to_ulonglong(&ltime);
}

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int Item_decimal::save_in_field(Field *field, bool no_conversions)
{
  field->set_notnull();
  return field->store_decimal(&decimal_value);
}


5970 5971 5972 5973 5974 5975 5976 5977 5978 5979
bool Item_int::eq(const Item *arg, bool binary_cmp) const
{
  /* No need to check for null value as basic constant can't be NULL */
  if (arg->basic_const_item() && arg->type() == type())
  {
    /*
      We need to cast off const to call val_int(). This should be OK for
      a basic constant.
    */
    Item *item= (Item*) arg;
5980 5981 5982
    return (item->val_int() == value &&
            ((longlong) value >= 0 ||
             (item->unsigned_flag == unsigned_flag)));
5983 5984 5985 5986 5987
  }
  return FALSE;
}


5988
Item *Item_int_with_ref::clone_item()
5989
{
5990
  DBUG_ASSERT(ref->const_item());
5991 5992 5993 5994 5995 5996 5997 5998 5999 6000
  /*
    We need to evaluate the constant to make sure it works with
    parameter markers.
  */
  return (ref->unsigned_flag ?
          new Item_uint(ref->name, ref->val_int(), ref->max_length) :
          new Item_int(ref->name, ref->val_int(), ref->max_length));
}


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Item_num *Item_uint::neg()
{
6003
  Item_decimal *item= new Item_decimal(value, 1);
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  return item->neg();
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}
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6007

6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022
static uint nr_of_decimals(const char *str, const char *end)
{
  const char *decimal_point;

  /* Find position for '.' */
  for (;;)
  {
    if (str == end)
      return 0;
    if (*str == 'e' || *str == 'E')
      return NOT_FIXED_DEC;    
    if (*str++ == '.')
      break;
  }
  decimal_point= str;
6023
  for ( ; str < end && my_isdigit(system_charset_info, *str) ; str++)
6024
    ;
6025
  if (str < end && (*str == 'e' || *str == 'E'))
6026
    return NOT_FIXED_DEC;
6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043
  /*
    QQ:
    The number of decimal digist in fact should be (str - decimal_point - 1).
    But it seems the result of nr_of_decimals() is never used!

    In case of 'e' and 'E' nr_of_decimals returns NOT_FIXED_DEC.
    In case if there is no 'e' or 'E' parser code in sql_yacc.yy
    never calls Item_float::Item_float() - it creates Item_decimal instead.

    The only piece of code where we call Item_float::Item_float(str, len)
    without having 'e' or 'E' is item_xmlfunc.cc, but this Item_float
    never appears in metadata itself. Changing the code to return
    (str - decimal_point - 1) does not make any changes in the test results.

    This should be addressed somehow.
    Looks like a reminder from before real DECIMAL times.
  */
6044 6045 6046 6047
  return (uint) (str - decimal_point);
}


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6048
/**
6049 6050 6051 6052 6053 6054 6055 6056 6057 6058 6059
  This function is only called during parsing:
  - when parsing SQL query from sql_yacc.yy
  - when parsing XPath query from item_xmlfunc.cc
  We will signal an error if value is not a true double value (overflow):
  eng: Illegal %s '%-.192s' value found during parsing
  
  Note: the string is NOT null terminated when called from item_xmlfunc.cc,
  so this->name will contain some SQL query tail behind the "length" bytes.
  This is Ok for now, as this Item is never seen in SHOW,
  or EXPLAIN, or anywhere else in metadata.
  Item->name should be fixed to use LEX_STRING eventually.
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6060 6061
*/

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6062
Item_float::Item_float(const char *str_arg, uint length)
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6063 6064
{
  int error;
6065 6066 6067
  char *end_not_used;
  value= my_strntod(&my_charset_bin, (char*) str_arg, length, &end_not_used,
                    &error);
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6068 6069
  if (error)
  {
6070 6071 6072
    char tmp[NAME_LEN + 1];
    my_snprintf(tmp, sizeof(tmp), "%.*s", length, str_arg);
    my_error(ER_ILLEGAL_VALUE_FOR_TYPE, MYF(0), "double", tmp);
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6073 6074
  }
  presentation= name=(char*) str_arg;
6075
  decimals=(uint8) nr_of_decimals(str_arg, str_arg+length);
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  max_length=length;
  fixed= 1;
}


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6081
int Item_float::save_in_field(Field *field, bool no_conversions)
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6082
{
6083
  double nr= val_real();
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6084 6085 6086
  if (null_value)
    return set_field_to_null(field);
  field->set_notnull();
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  return field->store(nr);
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}

6090

6091
void Item_float::print(String *str, enum_query_type query_type)
6092 6093 6094 6095 6096 6097 6098 6099
{
  if (presentation)
  {
    str->append(presentation);
    return;
  }
  char buffer[20];
  String num(buffer, sizeof(buffer), &my_charset_bin);
6100
  num.set_real(value, decimals, &my_charset_bin);
6101 6102 6103 6104
  str->append(num);
}


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/*
  hex item
  In string context this is a binary string.
  In number context this is a longlong value.
*/
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6110

6111
bool Item_float::eq(const Item *arg, bool binary_cmp) const
6112 6113 6114 6115 6116 6117 6118 6119
{
  if (arg->basic_const_item() && arg->type() == type())
  {
    /*
      We need to cast off const to call val_int(). This should be OK for
      a basic constant.
    */
    Item *item= (Item*) arg;
6120
    return item->val_real() == value;
6121 6122 6123 6124
  }
  return FALSE;
}

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6125

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inline uint char_val(char X)
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{
  return (uint) (X >= '0' && X <= '9' ? X-'0' :
		 X >= 'A' && X <= 'Z' ? X-'A'+10 :
		 X-'a'+10);
}

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6133 6134 6135 6136
Item_hex_string::Item_hex_string()
{
  hex_string_init("", 0);
}
6137

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6138
Item_hex_string::Item_hex_string(const char *str, uint str_length)
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{
  hex_string_init(str, str_length);
}

void Item_hex_string::hex_string_init(const char *str, uint str_length)
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{
  max_length=(str_length+1)/2;
  char *ptr=(char*) sql_alloc(max_length+1);
  if (!ptr)
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6148 6149
  {
    str_value.set("", 0, &my_charset_bin);
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    return;
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6151
  }
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  str_value.set(ptr,max_length,&my_charset_bin);
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  char *end=ptr+max_length;
  if (max_length*2 != str_length)
    *ptr++=char_val(*str++);			// Not even, assume 0 prefix
  while (ptr != end)
  {
    *ptr++= (char) (char_val(str[0])*16+char_val(str[1]));
    str+=2;
  }
  *ptr=0;					// Keep purify happy
6162
  collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
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  fixed= 1;
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6164
  unsigned_flag= 1;
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}

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longlong Item_hex_string::val_int()
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{
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  // following assert is redundant, because fixed=1 assigned in constructor
6170
  DBUG_ASSERT(fixed == 1);
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  char *end=(char*) str_value.ptr()+str_value.length(),
       *ptr=end-min(str_value.length(),sizeof(longlong));

  ulonglong value=0;
  for (; ptr != end ; ptr++)
    value=(value << 8)+ (ulonglong) (uchar) *ptr;
  return (longlong) value;
}


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my_decimal *Item_hex_string::val_decimal(my_decimal *decimal_value)
{
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
  ulonglong value= (ulonglong)val_int();
  int2my_decimal(E_DEC_FATAL_ERROR, value, TRUE, decimal_value);
  return (decimal_value);
}


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6191
int Item_hex_string::save_in_field(Field *field, bool no_conversions)
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6192 6193 6194
{
  field->set_notnull();
  if (field->result_type() == STRING_RESULT)
6195 6196 6197 6198 6199
    return field->store(str_value.ptr(), str_value.length(), 
                        collation.collation);

  ulonglong nr;
  uint32 length= str_value.length();
6200 6201 6202
  if (!length)
    return 1;

6203
  if (length > 8)
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6204
  {
6205 6206
    nr= field->flags & UNSIGNED_FLAG ? ULONGLONG_MAX : LONGLONG_MAX;
    goto warn;
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6207
  }
6208 6209
  nr= (ulonglong) val_int();
  if ((length == 8) && !(field->flags & UNSIGNED_FLAG) && (nr > LONGLONG_MAX))
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  {
6211 6212
    nr= LONGLONG_MAX;
    goto warn;
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  }
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  return field->store((longlong) nr, TRUE);  // Assume hex numbers are unsigned
6215 6216

warn:
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  if (!field->store((longlong) nr, TRUE))
6218 6219 6220
    field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE,
                       1);
  return 1;
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}


6224
void Item_hex_string::print(String *str, enum_query_type query_type)
6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236
{
  char *end= (char*) str_value.ptr() + str_value.length(),
       *ptr= end - min(str_value.length(), sizeof(longlong));
  str->append("0x");
  for (; ptr != end ; ptr++)
  {
    str->append(_dig_vec_lower[((uchar) *ptr) >> 4]);
    str->append(_dig_vec_lower[((uchar) *ptr) & 0x0F]);
  }
}


6237
bool Item_hex_string::eq(const Item *arg, bool binary_cmp) const
6238 6239 6240 6241 6242 6243 6244 6245 6246 6247
{
  if (arg->basic_const_item() && arg->type() == type())
  {
    if (binary_cmp)
      return !stringcmp(&str_value, &arg->str_value);
    return !sortcmp(&str_value, &arg->str_value, collation.collation);
  }
  return FALSE;
}

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Item *Item_hex_string::safe_charset_converter(CHARSET_INFO *tocs)
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6250 6251 6252 6253 6254 6255 6256
{
  Item_string *conv;
  String tmp, *str= val_str(&tmp);

  if (!(conv= new Item_string(str->ptr(), str->length(), tocs)))
    return NULL;
  conv->str_value.copy();
6257
  conv->str_value.mark_as_const();
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  return conv;
}


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6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277 6278
/*
  bin item.
  In string context this is a binary string.
  In number context this is a longlong value.
*/
  
Item_bin_string::Item_bin_string(const char *str, uint str_length)
{
  const char *end= str + str_length - 1;
  uchar bits= 0;
  uint power= 1;

  max_length= (str_length + 7) >> 3;
  char *ptr= (char*) sql_alloc(max_length + 1);
  if (!ptr)
    return;
  str_value.set(ptr, max_length, &my_charset_bin);
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6279 6280

  if (max_length > 0)
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6281
  {
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6282 6283 6284
    ptr+= max_length - 1;
    ptr[1]= 0;                     // Set end null for string
    for (; end >= str; end--)
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6285
    {
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6286 6287 6288 6289 6290 6291 6292 6293 6294
      if (power == 256)
      {
        power= 1;
        *ptr--= bits;
        bits= 0;
      }
      if (*end == '1')
        bits|= power;
      power<<= 1;
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6295
    }
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6296
    *ptr= (char) bits;
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6297
  }
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  else
    ptr[0]= 0;

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  collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
  fixed= 1;
}


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6306 6307
/**
  Pack data in buffer for sending.
6308 6309 6310
*/

bool Item_null::send(Protocol *protocol, String *packet)
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6311
{
6312
  return protocol->store_null();
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}

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/**
  This is only called from items that is not of type item_field.
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*/

6319
bool Item::send(Protocol *protocol, String *buffer)
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{
6321
  bool UNINIT_VAR(result);                       // Will be set if null_value == 0
6322
  enum_field_types f_type;
6323

6324
  switch ((f_type=field_type())) {
6325
  default:
6326 6327 6328 6329 6330 6331 6332 6333 6334
  case MYSQL_TYPE_NULL:
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_GEOMETRY:
6335 6336
  case MYSQL_TYPE_STRING:
  case MYSQL_TYPE_VAR_STRING:
6337
  case MYSQL_TYPE_VARCHAR:
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6338
  case MYSQL_TYPE_BIT:
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6339
  case MYSQL_TYPE_NEWDECIMAL:
6340 6341 6342
  {
    String *res;
    if ((res=val_str(buffer)))
6343 6344
    {
      DBUG_ASSERT(!null_value);
6345
      result= protocol->store(res->ptr(),res->length(),res->charset());
6346
    }
6347 6348 6349 6350
    else
    {
      DBUG_ASSERT(null_value);
    }
6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361
    break;
  }
  case MYSQL_TYPE_TINY:
  {
    longlong nr;
    nr= val_int();
    if (!null_value)
      result= protocol->store_tiny(nr);
    break;
  }
  case MYSQL_TYPE_SHORT:
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6362
  case MYSQL_TYPE_YEAR:
6363 6364 6365 6366 6367 6368 6369
  {
    longlong nr;
    nr= val_int();
    if (!null_value)
      result= protocol->store_short(nr);
    break;
  }
6370
  case MYSQL_TYPE_INT24:
6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386
  case MYSQL_TYPE_LONG:
  {
    longlong nr;
    nr= val_int();
    if (!null_value)
      result= protocol->store_long(nr);
    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
    longlong nr;
    nr= val_int();
    if (!null_value)
      result= protocol->store_longlong(nr, unsigned_flag);
    break;
  }
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  case MYSQL_TYPE_FLOAT:
  {
    float nr;
6390
    nr= (float) val_real();
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    if (!null_value)
      result= protocol->store(nr, decimals, buffer);
    break;
  }
6395 6396
  case MYSQL_TYPE_DOUBLE:
  {
6397
    double nr= val_real();
6398 6399 6400 6401 6402 6403
    if (!null_value)
      result= protocol->store(nr, decimals, buffer);
    break;
  }
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_DATE:
6404
  case MYSQL_TYPE_TIMESTAMP:
6405
  {
6406
    MYSQL_TIME tm;
6407
    get_date(&tm, TIME_FUZZY_DATE | sql_mode_for_dates());
6408 6409
    if (!null_value)
    {
6410
      if (f_type == MYSQL_TYPE_DATE)
6411 6412
	return protocol->store_date(&tm);
      else
6413
	result= protocol->store(&tm, decimals);
6414 6415 6416 6417 6418
    }
    break;
  }
  case MYSQL_TYPE_TIME:
  {
6419
    MYSQL_TIME tm;
6420 6421
    get_time(&tm);
    if (!null_value)
6422
      result= protocol->store_time(&tm, decimals);
6423 6424 6425 6426 6427 6428
    break;
  }
  }
  if (null_value)
    result= protocol->store_null();
  return result;
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6429 6430
}

6431

6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451
/**
  Check if an item is a constant one and can be cached.

  @param arg [out] TRUE <=> Cache this item.

  @return TRUE  Go deeper in item tree.
  @return FALSE Don't go deeper in item tree.
*/

bool Item::cache_const_expr_analyzer(uchar **arg)
{
  bool *cache_flag= (bool*)*arg;
  if (!*cache_flag)
  {
    Item *item= real_item();
    /*
      Cache constant items unless it's a basic constant, constant field or
      a subselect (they use their own cache).
    */
    if (const_item() &&
6452 6453
        !(basic_const_item() || item->basic_const_item() ||
          item->type() == Item::FIELD_ITEM ||
6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492
          item->type() == SUBSELECT_ITEM ||
           /*
             Do not cache GET_USER_VAR() function as its const_item() may
             return TRUE for the current thread but it still may change
             during the execution.
           */
          (item->type() == Item::FUNC_ITEM &&
           ((Item_func*)item)->functype() == Item_func::GUSERVAR_FUNC)))
      *cache_flag= TRUE;
    return TRUE;
  }
  return FALSE;
}


/**
  Cache item if needed.

  @param arg   TRUE <=> Cache this item.

  @return cache if cache needed.
  @return this otherwise.
*/

Item* Item::cache_const_expr_transformer(uchar *arg)
{
  if (*(bool*)arg)
  {
    *((bool*)arg)= FALSE;
    Item_cache *cache= Item_cache::get_cache(this);
    if (!cache)
      return NULL;
    cache->setup(this);
    cache->store(this);
    return cache;
  }
  return this;
}

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/**
  Find Item by reference in the expression
*/
bool Item::find_item_processor(uchar *arg)
{
  return (this == ((Item *) arg));
}
6500

6501
bool Item_field::send(Protocol *protocol, String *buffer)
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{
6503
  return protocol->store(result_field);
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}

6506

6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522
void Item_field::update_null_value() 
{ 
  /* 
    need to set no_errors to prevent warnings about type conversion 
    popping up.
  */
  THD *thd= field->table->in_use;
  int no_errors;

  no_errors= thd->no_errors;
  thd->no_errors= 1;
  Item::update_null_value();
  thd->no_errors= no_errors;
}


6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544
/*
  Add the field to the select list and substitute it for the reference to
  the field.

  SYNOPSIS
    Item_field::update_value_transformer()
    select_arg      current select

  DESCRIPTION
    If the field doesn't belong to the table being inserted into then it is
    added to the select list, pointer to it is stored in the ref_pointer_array
    of the select and the field itself is substituted for the Item_ref object.
    This is done in order to get correct values from update fields that
    belongs to the SELECT part in the INSERT .. SELECT .. ON DUPLICATE KEY
    UPDATE statement.

  RETURN
    0             if error occured
    ref           if all conditions are met
    this field    otherwise
*/

6545
Item *Item_field::update_value_transformer(uchar *select_arg)
6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567
{
  SELECT_LEX *select= (SELECT_LEX*)select_arg;
  DBUG_ASSERT(fixed);

  if (field->table != select->context.table_list->table &&
      type() != Item::TRIGGER_FIELD_ITEM)
  {
    List<Item> *all_fields= &select->join->all_fields;
    Item **ref_pointer_array= select->ref_pointer_array;
    int el= all_fields->elements;
    Item_ref *ref;

    ref_pointer_array[el]= (Item*)this;
    all_fields->push_front((Item*)this);
    ref= new Item_ref(&select->context, ref_pointer_array + el,
                      table_name, field_name);
    return ref;
  }
  return this;
}


6568
void Item_field::print(String *str, enum_query_type query_type)
6569 6570 6571
{
  if (field && field->table->const_table)
  {
6572
    print_value(str);
6573 6574
    return;
  }
6575
  Item_ident::print(str, query_type);
6576 6577 6578
}


6579 6580
Item_ref::Item_ref(Name_resolution_context *context_arg,
                   Item **item, const char *table_name_arg,
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6581 6582
                   const char *field_name_arg,
                   bool alias_name_used_arg)
6583
  :Item_ident(context_arg, NullS, table_name_arg, field_name_arg),
6584
   result_field(0), ref(item), reference_trough_name(0)
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6585
{
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6586
  alias_name_used= alias_name_used_arg;
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6587 6588 6589
  /*
    This constructor used to create some internals references over fixed items
  */
6590
  if (ref && *ref && (*ref)->fixed)
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6591 6592 6593
    set_properties();
}

6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609
/*
  A Field_enumerator-compatible class that invokes mark_as_dependent() for
  each field that is a reference to some ancestor of current_select.
*/
class Dependency_marker: public Field_enumerator
{
public:
  THD *thd;
  st_select_lex *current_select;
  virtual void visit_field(Item_field *item)
  {
    // Find which select the field is in. This is achieved by walking up 
    // the select tree and looking for the table of interest.
    st_select_lex *sel;
    for (sel= current_select; sel; sel= sel->outer_select())
    {
6610
      List_iterator<TABLE_LIST> li(sel->leaf_tables);
6611
      TABLE_LIST *tbl;
6612
      while ((tbl= li++))
6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623
      {
        if (tbl->table == item->field->table)
        {
          if (sel != current_select)
            mark_as_dependent(thd, sel, current_select, item, item);
          return;
        }
      }
    }
  }
};
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6624

6625 6626 6627
Item_ref::Item_ref(TABLE_LIST *view_arg, Item **item,
                   const char *field_name_arg, bool alias_name_used_arg)
  :Item_ident(view_arg, field_name_arg),
6628
   result_field(NULL), ref(item), reference_trough_name(0)
6629 6630 6631 6632 6633 6634 6635 6636 6637 6638
{
  alias_name_used= alias_name_used_arg;
  /*
    This constructor is used to create some internal references over fixed items
  */
  if (ref && *ref && (*ref)->fixed)
    set_properties();
}


unknown's avatar
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6639
/**
6640
  Resolve the name of a reference to a column reference.
6641

unknown's avatar
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6642 6643 6644 6645
  The method resolves the column reference represented by 'this' as a column
  present in one of: GROUP BY clause, SELECT clause, outer queries. It is
  used typically for columns in the HAVING clause which are not under
  aggregate functions.
6646

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6647 6648
  POSTCONDITION @n
  Item_ref::ref is 0 or points to a valid item.
6649

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6650
  @note
6651 6652
    The name resolution algorithm used is (where [T_j] is an optional table
    name that qualifies the column name):
6653

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6654 6655
  @code
        resolve_extended([T_j].col_ref_i)
6656
        {
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6657 6658
          Search for a column or derived column named col_ref_i [in table T_j]
          in the SELECT and GROUP clauses of Q.
6659

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6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676
          if such a column is NOT found AND    // Lookup in outer queries.
             there are outer queries
          {
            for each outer query Q_k beginning from the inner-most one
           {
              Search for a column or derived column named col_ref_i
              [in table T_j] in the SELECT and GROUP clauses of Q_k.

              if such a column is not found AND
                 - Q_k is not a group query AND
                 - Q_k is not inside an aggregate function
                 OR
                 - Q_(k-1) is not in a HAVING or SELECT clause of Q_k
              {
                search for a column or derived column named col_ref_i
                [in table T_j] in the FROM clause of Q_k;
              }
6677 6678 6679
            }
          }
        }
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6680 6681
  @endcode
  @n
6682
    This procedure treats GROUP BY and SELECT clauses as one namespace for
6683 6684 6685
    column references in HAVING. Notice that compared to
    Item_field::fix_fields, here we first search the SELECT and GROUP BY
    clauses, and then we search the FROM clause.
6686

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6687 6688 6689
  @param[in]     thd        current thread
  @param[in,out] reference  view column if this item was resolved to a
    view column
6690

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6691 6692 6693 6694 6695 6696 6697
  @todo
    Here we could first find the field anyway, and then test this
    condition, so that we can give a better error message -
    ER_WRONG_FIELD_WITH_GROUP, instead of the less informative
    ER_BAD_FIELD_ERROR which we produce now.

  @retval
6698
    TRUE  if error
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6699
  @retval
6700 6701
    FALSE on success
*/
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6702

6703
bool Item_ref::fix_fields(THD *thd, Item **reference)
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6704
{
6705
  enum_parsing_place place= NO_MATTER;
6706
  DBUG_ASSERT(fixed == 0);
6707 6708
  SELECT_LEX *current_sel= thd->lex->current_select;

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6709
  if (!ref || ref == not_found_item)
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6710
  {
6711
    DBUG_ASSERT(reference_trough_name != 0);
6712 6713 6714
    if (!(ref= resolve_ref_in_select_and_group(thd, this,
                                               context->select_lex)))
      goto error;             /* Some error occurred (e.g. ambiguous names). */
6715

6716
    if (ref == not_found_item) /* This reference was not resolved. */
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6717
    {
6718 6719
      Name_resolution_context *last_checked_context= context;
      Name_resolution_context *outer_context= context->outer_context;
6720 6721 6722
      Field *from_field;
      ref= 0;

6723
      if (!outer_context)
6724 6725 6726 6727
      {
        /* The current reference cannot be resolved in this query. */
        my_error(ER_BAD_FIELD_ERROR,MYF(0),
                 this->full_name(), current_thd->where);
6728
        goto error;
6729
      }
6730

unknown's avatar
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6731
      /*
6732 6733 6734
        If there is an outer context (select), and it is not a derived table
        (which do not support the use of outer fields for now), try to
        resolve this reference in the outer select(s).
6735

6736 6737 6738
        We treat each subselect as a separate namespace, so that different
        subselects may contain columns with the same names. The subselects are
        searched starting from the innermost.
unknown's avatar
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6739
      */
6740 6741
      from_field= (Field*) not_found_field;

6742
      do
6743
      {
6744 6745 6746 6747
        SELECT_LEX *select= outer_context->select_lex;
        Item_subselect *prev_subselect_item=
          last_checked_context->select_lex->master_unit()->item;
        last_checked_context= outer_context;
6748

6749
        /* Search in the SELECT and GROUP lists of the outer select. */
6750
        if (outer_context->resolve_in_select_list)
6751
        {
6752 6753
          if (!(ref= resolve_ref_in_select_and_group(thd, this, select)))
            goto error; /* Some error occurred (e.g. ambiguous names). */
6754
          if (ref != not_found_item)
6755
          {
6756 6757 6758 6759
            DBUG_ASSERT(*ref && (*ref)->fixed);
            prev_subselect_item->used_tables_cache|= (*ref)->used_tables();
            prev_subselect_item->const_item_cache&= (*ref)->const_item();
            break;
6760 6761
          }
          /*
6762 6763 6764
            Set ref to 0 to ensure that we get an error in case we replaced
            this item with another item and still use this item in some
            other place of the parse tree.
6765
          */
6766
          ref= 0;
6767
        }
6768

6769 6770 6771 6772 6773
        place= prev_subselect_item->parsing_place;
        /*
          Check table fields only if the subquery is used somewhere out of
          HAVING or the outer SELECT does not use grouping (i.e. tables are
          accessible).
6774
          TODO:
6775 6776 6777 6778 6779 6780
          Here we could first find the field anyway, and then test this
          condition, so that we can give a better error message -
          ER_WRONG_FIELD_WITH_GROUP, instead of the less informative
          ER_BAD_FIELD_ERROR which we produce now.
        */
        if ((place != IN_HAVING ||
6781 6782
             (!select->with_sum_func &&
              select->group_list.elements == 0)))
6783
        {
6784
          /*
6785 6786 6787
            In case of view, find_field_in_tables() write pointer to view
            field expression to 'reference', i.e. it substitute that
            expression instead of this Item_ref
6788
          */
6789
          from_field= find_field_in_tables(thd, this,
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6790 6791 6792 6793
                                           outer_context->
                                             first_name_resolution_table,
                                           outer_context->
                                             last_name_resolution_table,
6794 6795
                                           reference,
                                           IGNORE_EXCEPT_NON_UNIQUE,
6796
                                           TRUE, TRUE);
6797
          if (! from_field)
6798
            goto error;
6799
          if (from_field == view_ref_found)
6800
          {
6801
            Item::Type refer_type= (*reference)->type();
6802 6803 6804 6805 6806
            prev_subselect_item->used_tables_cache|=
              (*reference)->used_tables();
            prev_subselect_item->const_item_cache&=
              (*reference)->const_item();
            DBUG_ASSERT((*reference)->type() == REF_ITEM);
6807 6808
            mark_as_dependent(thd, last_checked_context->select_lex,
                              context->select_lex, this,
6809 6810
                              ((refer_type == REF_ITEM ||
                                refer_type == FIELD_ITEM) ?
6811 6812 6813 6814 6815 6816
                               (Item_ident*) (*reference) :
                               0));
            /*
              view reference found, we substituted it instead of this
              Item, so can quit
            */
6817 6818
            return FALSE;
          }
6819 6820
          if (from_field != not_found_field)
          {
6821 6822 6823 6824 6825 6826 6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839
            if (cached_table && cached_table->select_lex &&
                outer_context->select_lex &&
                cached_table->select_lex != outer_context->select_lex)
            {
              /*
                Due to cache, find_field_in_tables() can return field which
                doesn't belong to provided outer_context. In this case we have
                to find proper field context in order to fix field correcly.
              */
              do
              {
                outer_context= outer_context->outer_context;
                select= outer_context->select_lex;
                prev_subselect_item=
                  last_checked_context->select_lex->master_unit()->item;
                last_checked_context= outer_context;
              } while (outer_context && outer_context->select_lex &&
                       cached_table->select_lex != outer_context->select_lex);
            }
6840 6841 6842 6843
            prev_subselect_item->used_tables_cache|= from_field->table->map;
            prev_subselect_item->const_item_cache= 0;
            break;
          }
6844
        }
6845 6846 6847 6848 6849 6850
        DBUG_ASSERT(from_field == not_found_field);

        /* Reference is not found => depend on outer (or just error). */
        prev_subselect_item->used_tables_cache|= OUTER_REF_TABLE_BIT;
        prev_subselect_item->const_item_cache= 0;

6851 6852
        outer_context= outer_context->outer_context;
      } while (outer_context);
6853 6854 6855

      DBUG_ASSERT(from_field != 0 && from_field != view_ref_found);
      if (from_field != not_found_field)
6856
      {
6857
        Item_field* fld;
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unknown committed
6858
        if (!(fld= new Item_field(from_field)))
6859
          goto error;
6860
        thd->change_item_tree(reference, fld);
6861
        mark_as_dependent(thd, last_checked_context->select_lex,
6862
                          thd->lex->current_select, fld, fld);
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6863 6864 6865 6866 6867 6868 6869 6870 6871 6872
        /*
          A reference is resolved to a nest level that's outer or the same as
          the nest level of the enclosing set function : adjust the value of
          max_arg_level for the function if it's needed.
        */
        if (thd->lex->in_sum_func &&
            thd->lex->in_sum_func->nest_level >= 
            last_checked_context->select_lex->nest_level)
          set_if_bigger(thd->lex->in_sum_func->max_arg_level,
                        last_checked_context->select_lex->nest_level);
6873 6874 6875 6876 6877 6878
        return FALSE;
      }
      if (ref == 0)
      {
        /* The item was not a table field and not a reference */
        my_error(ER_BAD_FIELD_ERROR, MYF(0),
6879
                 this->full_name(), current_thd->where);
6880
        goto error;
6881
      }
6882 6883
      /* Should be checked in resolve_ref_in_select_and_group(). */
      DBUG_ASSERT(*ref && (*ref)->fixed);
6884 6885
      mark_as_dependent(thd, last_checked_context->select_lex,
                        context->select_lex, this, this);
unknown's avatar
unknown committed
6886 6887 6888 6889 6890 6891 6892 6893 6894 6895
      /*
        A reference is resolved to a nest level that's outer or the same as
        the nest level of the enclosing set function : adjust the value of
        max_arg_level for the function if it's needed.
      */
      if (thd->lex->in_sum_func &&
          thd->lex->in_sum_func->nest_level >= 
          last_checked_context->select_lex->nest_level)
        set_if_bigger(thd->lex->in_sum_func->max_arg_level,
                      last_checked_context->select_lex->nest_level);
6896
    }
unknown's avatar
unknown committed
6897
  }
6898
  else if (ref_type() != VIEW_REF)
6899 6900 6901 6902 6903 6904 6905 6906 6907 6908 6909 6910
  {
    /*
      It could be that we're referring to something that's in ancestor selects.
      We must make an appropriate mark_as_dependent() call for each such
      outside reference.
    */
    Dependency_marker dep_marker;
    dep_marker.current_select= current_sel;
    dep_marker.thd= thd;
    (*ref)->walk(&Item::enumerate_field_refs_processor, FALSE,
                 (uchar*)&dep_marker);
  }
6911

6912
  DBUG_ASSERT(*ref);
6913
  /*
6914
    Check if this is an incorrect reference in a group function or forward
unknown's avatar
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6915 6916 6917
    reference. Do not issue an error if this is:
      1. outer reference (will be fixed later by the fix_inner_refs function);
      2. an unnamed reference inside an aggregate function.
6918
  */
unknown's avatar
unknown committed
6919 6920 6921 6922 6923 6924
  if (!((*ref)->type() == REF_ITEM &&
       ((Item_ref *)(*ref))->ref_type() == OUTER_REF) &&
      (((*ref)->with_sum_func && name &&
        !(current_sel->linkage != GLOBAL_OPTIONS_TYPE &&
          current_sel->having_fix_field)) ||
       !(*ref)->fixed))
6925
  {
6926 6927 6928 6929
    my_error(ER_ILLEGAL_REFERENCE, MYF(0),
             name, ((*ref)->with_sum_func?
                    "reference to group function":
                    "forward reference in item list"));
6930
    goto error;
6931
  }
6932 6933 6934

  set_properties();

6935
  if ((*ref)->check_cols(1))
6936
    goto error;
6937
  return FALSE;
6938 6939 6940 6941

error:
  context->process_error(thd);
  return TRUE;
6942 6943
}

6944

6945 6946
void Item_ref::set_properties()
{
6947 6948 6949
  max_length= (*ref)->max_length;
  maybe_null= (*ref)->maybe_null;
  decimals=   (*ref)->decimals;
6950
  collation.set((*ref)->collation);
unknown's avatar
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6951 6952 6953 6954
  /*
    We have to remember if we refer to a sum function, to ensure that
    split_sum_func() doesn't try to change the reference.
  */
unknown's avatar
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6955
  with_sum_func= (*ref)->with_sum_func;
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6956
  with_field= (*ref)->with_field;
unknown's avatar
Merge  
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6957
  unsigned_flag= (*ref)->unsigned_flag;
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6958 6959 6960
  fixed= 1;
  if (alias_name_used)
    return;
unknown's avatar
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6961 6962 6963 6964
  if ((*ref)->type() == FIELD_ITEM)
    alias_name_used= ((Item_ident *) (*ref))->alias_name_used;
  else
    alias_name_used= TRUE; // it is not field, so it is was resolved by alias
unknown's avatar
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6965 6966
}

6967

unknown's avatar
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6968 6969
void Item_ref::cleanup()
{
unknown's avatar
unknown committed
6970
  DBUG_ENTER("Item_ref::cleanup");
unknown's avatar
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6971
  Item_ident::cleanup();
6972
  result_field= 0;
6973 6974 6975 6976 6977
  if (reference_trough_name)
  {
    /* We have to reset the reference as it may been freed */
    ref= 0;
  }
unknown's avatar
unknown committed
6978
  DBUG_VOID_RETURN;
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6979 6980 6981
}


6982 6983 6984 6985 6986 6987 6988 6989 6990 6991 6992 6993 6994 6995 6996 6997 6998 6999 7000
/**
  Transform an Item_ref object with a transformer callback function.

  The function first applies the transform method to the item
  referenced by this Item_reg object. If this returns a new item the
  old item is substituted for a new one. After this the transformer
  is applied to the Item_ref object.

  @param transformer   the transformer callback function to be applied to
                       the nodes of the tree of the object
  @param argument      parameter to be passed to the transformer

  @return Item returned as the result of transformation of the Item_ref object
    @retval !NULL The transformation was successful
    @retval NULL  Out of memory error
*/

Item* Item_ref::transform(Item_transformer transformer, uchar *arg)
{
Sergei Golubchik's avatar
Sergei Golubchik committed
7001
  DBUG_ASSERT(!current_thd->stmt_arena->is_stmt_prepare());
7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7024 7025 7026 7027 7028
  DBUG_ASSERT((*ref) != NULL);

  /* Transform the object we are referencing. */
  Item *new_item= (*ref)->transform(transformer, arg);
  if (!new_item)
    return NULL;

  /*
    THD::change_item_tree() should be called only if the tree was
    really transformed, i.e. when a new item has been created.
    Otherwise we'll be allocating a lot of unnecessary memory for
    change records at each execution.
  */
  if (*ref != new_item)
    current_thd->change_item_tree(ref, new_item);

  /* Transform the item ref object. */
  return (this->*transformer)(arg);
}


/**
  Compile an Item_ref object with a processor and a transformer
  callback functions.

  First the function applies the analyzer to the Item_ref object. Then
  if the analizer succeeeds we first applies the compile method to the
Igor Babaev's avatar
Igor Babaev committed
7029
  object the Item_ref object is referencing. If this returns a new
7030 7031
  item the old item is substituted for a new one.  After this the
  transformer is applied to the Item_ref object itself.
Igor Babaev's avatar
Igor Babaev committed
7032 7033
  The compile function is not called if the analyzer returns NULL
  in the parameter arg_p. 
7034 7035 7036 7037 7038 7039 7040 7041 7042 7043 7044 7045 7046 7047 7048 7049 7050 7051 7052 7053

  @param analyzer      the analyzer callback function to be applied to the
                       nodes of the tree of the object
  @param[in,out] arg_p parameter to be passed to the processor
  @param transformer   the transformer callback function to be applied to the
                       nodes of the tree of the object
  @param arg_t         parameter to be passed to the transformer

  @return Item returned as the result of transformation of the Item_ref object
*/

Item* Item_ref::compile(Item_analyzer analyzer, uchar **arg_p,
                        Item_transformer transformer, uchar *arg_t)
{
  /* Analyze this Item object. */
  if (!(this->*analyzer)(arg_p))
    return NULL;

  /* Compile the Item we are referencing. */
  DBUG_ASSERT((*ref) != NULL);
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Igor Babaev committed
7054 7055 7056 7057 7058 7059 7060
  if (*arg_p)
  {
    uchar *arg_v= *arg_p;
    Item *new_item= (*ref)->compile(analyzer, &arg_v, transformer, arg_t);
    if (new_item && *ref != new_item)
      current_thd->change_item_tree(ref, new_item);
  }
7061

7062 7063 7064 7065 7066
  /* Transform this Item object. */
  return (this->*transformer)(arg_t);
}


7067
void Item_ref::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
7068
{
7069
  if (ref)
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7070 7071
  {
    if ((*ref)->type() != Item::CACHE_ITEM && ref_type() != VIEW_REF &&
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7072
        !table_name && name && alias_name_used)
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7073 7074
    {
      THD *thd= current_thd;
7075
      append_identifier(thd, str, (*ref)->real_item()->name,
7076
                        strlen((*ref)->real_item()->name));
unknown's avatar
unknown committed
7077 7078
    }
    else
7079
      (*ref)->print(str, query_type);
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7080
  }
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7081
  else
7082
    Item_ident::print(str, query_type);
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7083 7084 7085
}


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bool Item_ref::send(Protocol *prot, String *tmp)
{
  if (result_field)
    return prot->store(result_field);
  return (*ref)->send(prot, tmp);
}


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double Item_ref::val_result()
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
      return 0.0;
    return result_field->val_real();
  }
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  return val_real();
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}


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bool Item_ref::is_null_result()
{
  if (result_field)
    return (null_value=result_field->is_null());

  return is_null();
}


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longlong Item_ref::val_int_result()
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
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      return 0;
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    return result_field->val_int();
  }
  return val_int();
}


String *Item_ref::str_result(String* str)
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
      return 0;
    str->set_charset(str_value.charset());
    return result_field->val_str(str, &str_value);
  }
  return val_str(str);
}


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my_decimal *Item_ref::val_decimal_result(my_decimal *decimal_value)
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
      return 0;
    return result_field->val_decimal(decimal_value);
  }
  return val_decimal(decimal_value);
}


bool Item_ref::val_bool_result()
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
      return 0;
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    switch (result_field->result_type()) {
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    case INT_RESULT:
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      return result_field->val_int() != 0;
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    case DECIMAL_RESULT:
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    {
      my_decimal decimal_value;
      my_decimal *val= result_field->val_decimal(&decimal_value);
      if (val)
        return !my_decimal_is_zero(val);
      return 0;
    }
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    case REAL_RESULT:
    case STRING_RESULT:
      return result_field->val_real() != 0.0;
    case ROW_RESULT:
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    case TIME_RESULT:
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    case IMPOSSIBLE_RESULT:
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      DBUG_ASSERT(0);
    }
  }
  return val_bool();
}


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void Item_ref::save_result(Field *to)
{
  if (result_field)
  {
    save_field_in_field(result_field, &null_value, to, TRUE);
    return;
  }
  (*ref)->save_result(to);
  null_value= (*ref)->null_value;
}


void Item_ref::save_val(Field *to)
{
  (*ref)->save_result(to);
  null_value= (*ref)->null_value;
}


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double Item_ref::val_real()
{
  DBUG_ASSERT(fixed);
  double tmp=(*ref)->val_result();
  null_value=(*ref)->null_value;
  return tmp;
}


longlong Item_ref::val_int()
{
  DBUG_ASSERT(fixed);
  longlong tmp=(*ref)->val_int_result();
  null_value=(*ref)->null_value;
  return tmp;
}


bool Item_ref::val_bool()
{
  DBUG_ASSERT(fixed);
  bool tmp= (*ref)->val_bool_result();
  null_value= (*ref)->null_value;
  return tmp;
}


String *Item_ref::val_str(String* tmp)
{
  DBUG_ASSERT(fixed);
  tmp=(*ref)->str_result(tmp);
  null_value=(*ref)->null_value;
  return tmp;
}


bool Item_ref::is_null()
{
  DBUG_ASSERT(fixed);
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  bool tmp=(*ref)->is_null_result();
  null_value=(*ref)->null_value;
  return tmp;
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}


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bool Item_ref::get_date(MYSQL_TIME *ltime,ulonglong fuzzydate)
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{
  return (null_value=(*ref)->get_date_result(ltime,fuzzydate));
}


my_decimal *Item_ref::val_decimal(my_decimal *decimal_value)
{
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  my_decimal *val= (*ref)->val_decimal_result(decimal_value);
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  null_value= (*ref)->null_value;
  return val;
}

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int Item_ref::save_in_field(Field *to, bool no_conversions)
{
  int res;
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  if (result_field)
  {
    if (result_field->is_null())
    {
      null_value= 1;
      res= set_field_to_null_with_conversions(to, no_conversions);
      return res;
    }
    to->set_notnull();
    res= field_conv(to, result_field);
    null_value= 0;
    return res;
  }
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  res= (*ref)->save_in_field(to, no_conversions);
  null_value= (*ref)->null_value;
  return res;
}

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void Item_ref::save_org_in_field(Field *field)
{
  (*ref)->save_org_in_field(field);
}


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void Item_ref::make_field(Send_field *field)
{
  (*ref)->make_field(field);
  /* Non-zero in case of a view */
  if (name)
    field->col_name= name;
  if (table_name)
    field->table_name= table_name;
  if (db_name)
    field->db_name= db_name;
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  if (orig_field_name)
    field->org_col_name= orig_field_name;
  if (orig_table_name)
    field->org_table_name= orig_table_name;
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}
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Item *Item_ref::get_tmp_table_item(THD *thd)
{
  if (!result_field)
    return (*ref)->get_tmp_table_item(thd);

  Item_field *item= new Item_field(result_field);
  if (item)
  {
    item->table_name= table_name;
    item->db_name= db_name;
  }
  return item;
}


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void Item_ref_null_helper::print(String *str, enum_query_type query_type)
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{
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  str->append(STRING_WITH_LEN("<ref_null_helper>("));
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  if (ref)
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    (*ref)->print(str, query_type);
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  else
    str->append('?');
  str->append(')');
}


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void Item_direct_ref::save_val(Field *to)
{
  (*ref)->save_val(to);
  null_value=(*ref)->null_value;
}


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double Item_direct_ref::val_real()
{
  double tmp=(*ref)->val_real();
  null_value=(*ref)->null_value;
  return tmp;
}


longlong Item_direct_ref::val_int()
{
  longlong tmp=(*ref)->val_int();
  null_value=(*ref)->null_value;
  return tmp;
}


String *Item_direct_ref::val_str(String* tmp)
{
  tmp=(*ref)->val_str(tmp);
  null_value=(*ref)->null_value;
  return tmp;
}


my_decimal *Item_direct_ref::val_decimal(my_decimal *decimal_value)
{
  my_decimal *tmp= (*ref)->val_decimal(decimal_value);
  null_value=(*ref)->null_value;
  return tmp;
}


bool Item_direct_ref::val_bool()
{
  bool tmp= (*ref)->val_bool();
  null_value=(*ref)->null_value;
  return tmp;
}


bool Item_direct_ref::is_null()
{
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  return (*ref)->is_null();
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}


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bool Item_direct_ref::get_date(MYSQL_TIME *ltime,ulonglong fuzzydate)
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{
  return (null_value=(*ref)->get_date(ltime,fuzzydate));
}


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Item_cache_wrapper::~Item_cache_wrapper()
{
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  DBUG_ASSERT(expr_cache == 0);
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}

Item_cache_wrapper::Item_cache_wrapper(Item *item_arg)
:orig_item(item_arg), expr_cache(NULL), expr_value(NULL)
{
  DBUG_ASSERT(orig_item->fixed);
  max_length= orig_item->max_length;
  maybe_null= orig_item->maybe_null;
  decimals=   orig_item->decimals;
  collation.set(orig_item->collation);
  with_sum_func= orig_item->with_sum_func;
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  with_field= orig_item->with_field;
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  unsigned_flag= orig_item->unsigned_flag;
  name= item_arg->name;
  name_length= item_arg->name_length;
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  with_subselect=  orig_item->with_subselect;
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  if ((expr_value= Item_cache::get_cache(orig_item)))
    expr_value->setup(orig_item);

  fixed= 1;
}


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/**
  Initialize the cache if it is needed
*/

void Item_cache_wrapper::init_on_demand()
{
    if (!expr_cache->is_inited())
    {
      orig_item->get_cache_parameters(parameters);
      expr_cache->init();
    }
}


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void Item_cache_wrapper::print(String *str, enum_query_type query_type)
{
  str->append(func_name());
  if (expr_cache)
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  {
    init_on_demand();
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    expr_cache->print(str, query_type);
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  }
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  else
    str->append(STRING_WITH_LEN("<<DISABLED>>"));
  str->append('(');
  orig_item->print(str, query_type);
  str->append(')');
}


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/**
  Prepare the expression cache wrapper (do nothing)

  @retval FALSE OK
*/

bool Item_cache_wrapper::fix_fields(THD *thd  __attribute__((unused)),
                                    Item **it __attribute__((unused)))
{
  DBUG_ASSERT(orig_item->fixed);
  DBUG_ASSERT(fixed);
  return FALSE;
}

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bool Item_cache_wrapper::send(Protocol *protocol, String *buffer)
{
  if (result_field)
    return protocol->store(result_field);
  return Item::send(protocol, buffer);
}
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/**
  Clean the expression cache wrapper up before reusing it.
*/

void Item_cache_wrapper::cleanup()
{
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  DBUG_ENTER("Item_cache_wrapper::cleanup");
  Item_result_field::cleanup();
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  delete expr_cache;
  expr_cache= 0;
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  /* expr_value is Item so it will be destroyed from list of Items */
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  expr_value= 0;
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  parameters.empty();
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  DBUG_VOID_RETURN;
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}


/**
  Create an expression cache that uses a temporary table

  @param thd           Thread handle
  @param depends_on    Parameters of the expression to create cache for

  @details
  The function takes 'depends_on' as the list of all parameters for
  the expression wrapped into this object and creates an expression
  cache in a temporary table containing the field for the parameters
  and the result of the expression.

  @retval FALSE OK
  @retval TRUE  Error
*/

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bool Item_cache_wrapper::set_cache(THD *thd)
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{
  DBUG_ENTER("Item_cache_wrapper::set_cache");
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  DBUG_ASSERT(expr_cache == 0);
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  expr_cache= new Expression_cache_tmptable(thd, parameters, expr_value);
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  DBUG_RETURN(expr_cache == NULL);
}


/**
  Check if the current values of the parameters are in the expression cache

  @details
  The function checks whether the current set of the parameters of the
  referenced item can be found in the expression cache. If so the function
  returns the item by which the result of the expression can be easily
  extracted from the cache with the corresponding val_* method.

  @retval NULL    - parameters are not in the cache
  @retval <item*> - item providing the result of the expression found in cache
*/

Item *Item_cache_wrapper::check_cache()
{
  DBUG_ENTER("Item_cache_wrapper::check_cache");
  if (expr_cache)
  {
    Expression_cache_tmptable::result res;
    Item *cached_value;
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    init_on_demand();
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    res= expr_cache->check_value(&cached_value);
    if (res == Expression_cache_tmptable::HIT)
      DBUG_RETURN(cached_value);
  }
  DBUG_RETURN(NULL);
}


/**
  Get the value of the cached expression and put it in the cache
*/

inline void Item_cache_wrapper::cache()
{
  expr_value->store(orig_item);
  expr_value->cache_value();
  expr_cache->put_value(expr_value); // put in expr_cache
}


/**
  Get the value of the possibly cached item into the field.
*/

void Item_cache_wrapper::save_val(Field *to)
{
  Item *cached_value;
  DBUG_ENTER("Item_cache_wrapper::val_int");
  if (!expr_cache)
  {
    orig_item->save_val(to);
    null_value= orig_item->null_value;
    DBUG_VOID_RETURN;
  }

  if ((cached_value= check_cache()))
  {
    cached_value->save_val(to);
    null_value= cached_value->null_value;
    DBUG_VOID_RETURN;
  }
  cache();
  null_value= expr_value->null_value;
  expr_value->save_val(to);
  DBUG_VOID_RETURN;
}


/**
  Get the integer value of the possibly cached item.
*/

longlong Item_cache_wrapper::val_int()
{
  Item *cached_value;
  DBUG_ENTER("Item_cache_wrapper::val_int");
  if (!expr_cache)
  {
    longlong tmp= orig_item->val_int();
    null_value= orig_item->null_value;
    DBUG_RETURN(tmp);
  }

  if ((cached_value= check_cache()))
  {
    longlong tmp= cached_value->val_int();
    null_value= cached_value->null_value;
    DBUG_RETURN(tmp);
  }
  cache();
  null_value= expr_value->null_value;
  DBUG_RETURN(expr_value->val_int());
}


/**
  Get the real value of the possibly cached item
*/

double Item_cache_wrapper::val_real()
{
  Item *cached_value;
  DBUG_ENTER("Item_cache_wrapper::val_real");
  if (!expr_cache)
  {
    double tmp= orig_item->val_real();
    null_value= orig_item->null_value;
    DBUG_RETURN(tmp);
  }

  if ((cached_value= check_cache()))
  {
    double tmp= cached_value->val_real();
    null_value= cached_value->null_value;
    DBUG_RETURN(tmp);
  }
  cache();
  null_value= expr_value->null_value;
  DBUG_RETURN(expr_value->val_real());
}


/**
  Get the string value of the possibly cached item
*/

String *Item_cache_wrapper::val_str(String* str)
{
  Item *cached_value;
  DBUG_ENTER("Item_cache_wrapper::val_str");
  if (!expr_cache)
  {
    String *tmp= orig_item->val_str(str);
    null_value= orig_item->null_value;
    DBUG_RETURN(tmp);
  }

  if ((cached_value= check_cache()))
  {
    String *tmp= cached_value->val_str(str);
    null_value= cached_value->null_value;
    DBUG_RETURN(tmp);
  }
  cache();
  if ((null_value= expr_value->null_value))
    DBUG_RETURN(NULL);
  DBUG_RETURN(expr_value->val_str(str));
}


/**
  Get the decimal value of the possibly cached item
*/

my_decimal *Item_cache_wrapper::val_decimal(my_decimal* decimal_value)
{
  Item *cached_value;
  DBUG_ENTER("Item_cache_wrapper::val_decimal");
  if (!expr_cache)
  {
    my_decimal *tmp= orig_item->val_decimal(decimal_value);
    null_value= orig_item->null_value;
    DBUG_RETURN(tmp);
  }

  if ((cached_value= check_cache()))
  {
    my_decimal *tmp= cached_value->val_decimal(decimal_value);
    null_value= cached_value->null_value;
    DBUG_RETURN(tmp);
  }
  cache();
  if ((null_value= expr_value->null_value))
    DBUG_RETURN(NULL);
  DBUG_RETURN(expr_value->val_decimal(decimal_value));
}


/**
  Get the boolean value of the possibly cached item
*/

bool Item_cache_wrapper::val_bool()
{
  Item *cached_value;
  DBUG_ENTER("Item_cache_wrapper::val_bool");
  if (!expr_cache)
  {
    bool tmp= orig_item->val_bool();
    null_value= orig_item->null_value;
    DBUG_RETURN(tmp);
  }

  if ((cached_value= check_cache()))
  {
    bool tmp= cached_value->val_bool();
    null_value= cached_value->null_value;
    DBUG_RETURN(tmp);
  }
  cache();
  null_value= expr_value->null_value;
  DBUG_RETURN(expr_value->val_bool());
}


/**
  Check for NULL the value of the possibly cached item
*/

bool Item_cache_wrapper::is_null()
{
  Item *cached_value;
  DBUG_ENTER("Item_cache_wrapper::is_null");
  if (!expr_cache)
  {
    bool tmp= orig_item->is_null();
    null_value= orig_item->null_value;
    DBUG_RETURN(tmp);
  }

  if ((cached_value= check_cache()))
  {
    bool tmp= cached_value->is_null();
    null_value= cached_value->null_value;
    DBUG_RETURN(tmp);
  }
  cache();
  DBUG_RETURN((null_value= expr_value->null_value));
}


/**
  Get the date value of the possibly cached item
*/

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bool Item_cache_wrapper::get_date(MYSQL_TIME *ltime, ulonglong fuzzydate)
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{
  Item *cached_value;
  DBUG_ENTER("Item_cache_wrapper::get_date");
  if (!expr_cache)
    DBUG_RETURN((null_value= orig_item->get_date(ltime, fuzzydate)));

  if ((cached_value= check_cache()))
    DBUG_RETURN((null_value= cached_value->get_date(ltime, fuzzydate)));

  cache();
  DBUG_RETURN((null_value= expr_value->get_date(ltime, fuzzydate)));
}


int Item_cache_wrapper::save_in_field(Field *to, bool no_conversions)
{
  int res;
  DBUG_ASSERT(!result_field);
  res= orig_item->save_in_field(to, no_conversions);
  null_value= orig_item->null_value;
  return res;
}


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Item* Item_cache_wrapper::get_tmp_table_item(THD *thd_arg)
{
  if (!orig_item->with_sum_func && !orig_item->const_item())
    return new Item_field(result_field);
  return copy_or_same(thd_arg);
}


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bool Item_direct_view_ref::send(Protocol *protocol, String *buffer)
{
  if (check_null_ref())
    return protocol->store_null();
  return Item_direct_ref::send(protocol, buffer);
}

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/**
  Prepare referenced field then call usual Item_direct_ref::fix_fields .
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  @param thd         thread handler
  @param reference   reference on reference where this item stored
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  @retval
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    FALSE   OK
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  @retval
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    TRUE    Error
*/

bool Item_direct_view_ref::fix_fields(THD *thd, Item **reference)
{
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  DBUG_ASSERT(1);
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  /* view fild reference must be defined */
  DBUG_ASSERT(*ref);
  /* (*ref)->check_cols() will be made in Item_direct_ref::fix_fields */
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  if ((*ref)->fixed)
  {
    Item *ref_item= (*ref)->real_item();
    if (ref_item->type() == Item::FIELD_ITEM)
    {
      /*
        In some cases we need to update table read set(see bug#47150).
        If ref item is FIELD_ITEM and fixed then field and table
        have proper values. So we can use them for update.
      */
      Field *fld= ((Item_field*) ref_item)->field;
      DBUG_ASSERT(fld && fld->table);
      if (thd->mark_used_columns == MARK_COLUMNS_READ)
        bitmap_set_bit(fld->table->read_set, fld->field_index);
    }
  }
  else if (!(*ref)->fixed &&
           ((*ref)->fix_fields(thd, ref)))
7821
    return TRUE;
7822

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  if (Item_direct_ref::fix_fields(thd, reference))
    return TRUE;
  if (view->table && view->table->maybe_null)
    maybe_null= TRUE;
  return FALSE;
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}

7830 7831 7832 7833 7834 7835 7836 7837 7838 7839 7840 7841 7842 7843 7844
/*
  Prepare referenced outer field then call usual Item_direct_ref::fix_fields

  SYNOPSIS
    Item_outer_ref::fix_fields()
    thd         thread handler
    reference   reference on reference where this item stored

  RETURN
    FALSE   OK
    TRUE    Error
*/

bool Item_outer_ref::fix_fields(THD *thd, Item **reference)
{
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  bool err;
  /* outer_ref->check_cols() will be made in Item_direct_ref::fix_fields */
  if ((*ref) && !(*ref)->fixed && ((*ref)->fix_fields(thd, reference)))
7848
    return TRUE;
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  err= Item_direct_ref::fix_fields(thd, reference);
  if (!outer_ref)
    outer_ref= *ref;
  if ((*ref)->type() == Item::FIELD_ITEM)
    table_name= ((Item_field*)outer_ref)->table_name;
  return err;
7855 7856
}

7857

7858 7859
void Item_outer_ref::fix_after_pullout(st_select_lex *new_parent, Item **ref)
{
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7860
  if (get_depended_from() == new_parent)
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  {
    *ref= outer_ref;
7863
    (*ref)->fix_after_pullout(new_parent, ref);
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  }
}

void Item_ref::fix_after_pullout(st_select_lex *new_parent, Item **refptr)
{
7869
  (*ref)->fix_after_pullout(new_parent, ref);
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7870
  if (get_depended_from() == new_parent)
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    depended_from= NULL;
}


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/**
  Mark references from inner selects used in group by clause

  The method is used by the walk method when called for the expressions
  from the group by clause. The callsare  occurred in the function
  fix_inner_refs invoked by JOIN::prepare.
  The parameter passed to Item_outer_ref::check_inner_refs_processor
  is the iterator over the list of inner references from the subselects
  of the select to be prepared. The function marks those references
  from this list whose occurrences are encountered in the group by 
  expressions passed to the walk method.  
 
  @param arg  pointer to the iterator over a list of inner references

  @return
    FALSE always
*/

bool Item_outer_ref::check_inner_refs_processor(uchar *arg)
{
  List_iterator_fast<Item_outer_ref> *it=
    ((List_iterator_fast<Item_outer_ref> *) arg);
  Item_outer_ref *ref;
  while ((ref= (*it)++))
  {
    if (ref == this)
    {
      ref->found_in_group_by= 1;
      break;
    }
  }
  (*it).rewind();
  return FALSE;
}


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7911
/**
7912
  Compare two view column references for equality.
7913

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  A view column reference is considered equal to another column
  reference if the second one is a view column and if both column
  references resolve to the same item. It is assumed that both
  items are of the same type.
7918

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  @param item        item to compare with
  @param binary_cmp  make binary comparison
7921

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  @retval
7923
    TRUE    Referenced item is equal to given item
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  @retval
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    FALSE   otherwise
*/

bool Item_direct_view_ref::eq(const Item *item, bool binary_cmp) const
{
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  if (item->type() == REF_ITEM)
  {
    Item_ref *item_ref= (Item_ref*) item;
    if (item_ref->ref_type() == VIEW_REF)
    {
      Item *item_ref_ref= *(item_ref->ref);
7936
      return ((*ref)->real_item() == item_ref_ref->real_item());
7937 7938 7939
    }
  }
  return FALSE;
7940
}
7941

7942 7943 7944 7945 7946 7947 7948 7949 7950 7951 7952 7953 7954 7955 7956 7957 7958

Item_equal *Item_direct_view_ref::find_item_equal(COND_EQUAL *cond_equal)
{
  Item* field_item= real_item();
  if (field_item->type() != FIELD_ITEM)
    return NULL;
  return ((Item_field *) field_item)->find_item_equal(cond_equal);  
}


/**
  Check whether a reference to field item can be substituted for an equal item

  @details
  The function checks whether a substitution of a reference to field item for
  an equal item is valid.

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7959
  @param arg   *arg != NULL <-> the reference is in the context
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               where substitution for an equal item is valid

  @note
    See also the note for Item_field::subst_argument_checker

  @retval
    TRUE   substitution is valid
  @retval
    FALSE  otherwise
*/
bool Item_direct_view_ref::subst_argument_checker(uchar **arg)
{
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7972 7973 7974 7975 7976 7977 7978 7979 7980 7981
  bool res= FALSE;
  if (*arg)
  { 
    Item *item= real_item();
    if (item->type() == FIELD_ITEM &&
        (*arg == (uchar *) Item::ANY_SUBST || 
         result_type() != STRING_RESULT ||
         (((Item_field *) item)->field->flags & BINARY_FLAG)))
      res= TRUE;
  }
7982 7983
  /* Block any substitution into the wrapped object */
  if (*arg)
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7984
    *arg= NULL; 
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  return res; 
}


/**
  Set a pointer to the multiple equality the view field reference belongs to
  (if any).

  @details
  The function looks for a multiple equality containing this item of the type
  Item_direct_view_ref among those referenced by arg.
  In the case such equality exists the function does the following.
  If the found multiple equality contains a constant, then the item
  is substituted for this constant, otherwise the function sets a pointer
  to the multiple equality in the item.

  @param arg    reference to list of multiple equalities where
                the item (this object) is to be looked for

  @note
    This function is supposed to be called as a callback parameter in calls
    of the compile method.

  @note 
    The function calls Item_field::equal_fields_propagator for the field item
    this->real_item() to do the job. Then it takes the pointer to equal_item
    from this field item and assigns it to this->item_equal.

  @return
    - pointer to the replacing constant item, if the field item was substituted
    - pointer to the field item, otherwise.
*/

Item *Item_direct_view_ref::equal_fields_propagator(uchar *arg)
{
  Item *field_item= real_item();
  if (field_item->type() != FIELD_ITEM)
    return this;
  Item *item= field_item->equal_fields_propagator(arg);
  set_item_equal(field_item->get_item_equal());
  field_item->set_item_equal(NULL);
  if (item != field_item)
    return item;
  return this;
}


/**
  Replace an Item_direct_view_ref for an equal Item_field evaluated earlier
  (if any).

  @details
  If this->item_equal points to some item and coincides with arg then
  the function returns a pointer to a field item that is referred to by the 
  first element of the item_equal list which the Item_direct_view_ref
  object belongs to unless item_equal contains  a constant item. In this
  case the function returns this constant item (if the substitution does
   not require conversion).   
  If the Item_direct_view_item object does not refer any Item_equal object
  'this' is returned .

  @param arg   NULL or points to so some item of the Item_equal type  

  @note
    This function is supposed to be called as a callback parameter in calls
    of the transformer method.

  @note 
    The function calls Item_field::replace_equal_field for the field item
    this->real_item() to do the job.

  @return
    - pointer to a replacement Item_field if there is a better equal item or
      a pointer to a constant equal item;
    - this - otherwise.
*/

Item *Item_direct_view_ref::replace_equal_field(uchar *arg)
{
  Item *field_item= real_item();
  if (field_item->type() != FIELD_ITEM)
    return this;
  field_item->set_item_equal(item_equal);
  Item *item= field_item->replace_equal_field(arg);
  field_item->set_item_equal(0);
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8070
  return item != field_item ? item : this;
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}


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bool Item_default_value::eq(const Item *item, bool binary_cmp) const
{
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  return item->type() == DEFAULT_VALUE_ITEM && 
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    ((Item_default_value *)item)->arg->eq(arg, binary_cmp);
}

8080

8081
bool Item_default_value::fix_fields(THD *thd, Item **items)
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8082
{
8083
  Item *real_arg;
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  Item_field *field_arg;
  Field *def_field;
8086
  DBUG_ASSERT(fixed == 0);
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8087

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8088
  if (!arg)
8089 8090
  {
    fixed= 1;
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    return FALSE;
8092
  }
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  if (!arg->fixed && arg->fix_fields(thd, &arg))
    goto error;

8096

8097 8098
  real_arg= arg->real_item();
  if (real_arg->type() != FIELD_ITEM)
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8099
  {
8100
    my_error(ER_NO_DEFAULT_FOR_FIELD, MYF(0), arg->name);
8101
    goto error;
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8102
  }
8103

8104
  field_arg= (Item_field *)real_arg;
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  if (field_arg->field->flags & NO_DEFAULT_VALUE_FLAG)
  {
8107
    my_error(ER_NO_DEFAULT_FOR_FIELD, MYF(0), field_arg->field->field_name);
8108
    goto error;
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  }
  if (!(def_field= (Field*) sql_alloc(field_arg->field->size_of())))
8111
    goto error;
8112
  memcpy((void *)def_field, (void *)field_arg->field, field_arg->field->size_of());
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  def_field->move_field_offset((my_ptrdiff_t)
                               (def_field->table->s->default_values -
                                def_field->table->record[0]));
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  set_field(def_field);
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  return FALSE;
8118 8119 8120 8121

error:
  context->process_error(thd);
  return TRUE;
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}

8124

8125
void Item_default_value::print(String *str, enum_query_type query_type)
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{
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  if (!arg)
  {
8129
    str->append(STRING_WITH_LEN("default"));
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8130
    return;
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8131
  }
8132
  str->append(STRING_WITH_LEN("default("));
8133
  arg->print(str, query_type);
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  str->append(')');
}
8136

8137 8138 8139 8140 8141

int Item_default_value::save_in_field(Field *field_arg, bool no_conversions)
{
  if (!arg)
  {
8142 8143
    if (field_arg->flags & NO_DEFAULT_VALUE_FLAG &&
        field_arg->real_type() != MYSQL_TYPE_ENUM)
8144
    {
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      if (field_arg->reset())
      {
        my_message(ER_CANT_CREATE_GEOMETRY_OBJECT,
                   ER(ER_CANT_CREATE_GEOMETRY_OBJECT), MYF(0));
        return -1;
      }

8152 8153
      if (context->error_processor == &view_error_processor)
      {
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        TABLE_LIST *view= cached_table->top_table();
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        push_warning_printf(field_arg->table->in_use,
                            MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_NO_DEFAULT_FOR_VIEW_FIELD,
                            ER(ER_NO_DEFAULT_FOR_VIEW_FIELD),
                            view->view_db.str,
                            view->view_name.str);
      }
      else
      {
        push_warning_printf(field_arg->table->in_use,
                            MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_NO_DEFAULT_FOR_FIELD,
                            ER(ER_NO_DEFAULT_FOR_FIELD),
                            field_arg->field_name);
      }
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      return 1;
    }
    field_arg->set_default();
    return 0;
  }
  return Item_field::save_in_field(field_arg, no_conversions);
}


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8179
/**
8180
  This method like the walk method traverses the item tree, but at the
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8181
  same time it can replace some nodes in the tree.
8182
*/ 
8183

8184
Item *Item_default_value::transform(Item_transformer transformer, uchar *args)
8185
{
8186
  DBUG_ASSERT(!current_thd->stmt_arena->is_stmt_prepare());
8187

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  /*
    If the value of arg is NULL, then this object represents a constant,
    so further transformation is unnecessary (and impossible).
  */
  if (!arg)
    return 0;

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  Item *new_item= arg->transform(transformer, args);
  if (!new_item)
    return 0;

  /*
    THD::change_item_tree() should be called only if the tree was
    really transformed, i.e. when a new item has been created.
    Otherwise we'll be allocating a lot of unnecessary memory for
    change records at each execution.
  */
  if (arg != new_item)
    current_thd->change_item_tree(&arg, new_item);
  return (this->*transformer)(args);
}


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bool Item_insert_value::eq(const Item *item, bool binary_cmp) const
{
  return item->type() == INSERT_VALUE_ITEM &&
    ((Item_default_value *)item)->arg->eq(arg, binary_cmp);
}


8218
bool Item_insert_value::fix_fields(THD *thd, Item **items)
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{
8220
  DBUG_ASSERT(fixed == 0);
8221
  /* We should only check that arg is in first table */
8222
  if (!arg->fixed)
8223
  {
8224
    bool res;
8225
    TABLE_LIST *orig_next_table= context->last_name_resolution_table;
8226 8227
    context->last_name_resolution_table= context->first_name_resolution_table;
    res= arg->fix_fields(thd, &arg);
8228
    context->last_name_resolution_table= orig_next_table;
8229 8230
    if (res)
      return TRUE;
8231
  }
8232

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  if (arg->type() == REF_ITEM)
8234 8235
    arg= static_cast<Item_ref *>(arg)->ref[0];
  if (arg->type() != FIELD_ITEM)
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  {
8237 8238
    my_error(ER_BAD_FIELD_ERROR, MYF(0), "", "VALUES() function");
    return TRUE;
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8239
  }
8240

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  Item_field *field_arg= (Item_field *)arg;
8242

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  if (field_arg->field->table->insert_values)
  {
    Field *def_field= (Field*) sql_alloc(field_arg->field->size_of());
    if (!def_field)
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      return TRUE;
8248
    memcpy((void *)def_field, (void *)field_arg->field, field_arg->field->size_of());
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    def_field->move_field_offset((my_ptrdiff_t)
                                 (def_field->table->insert_values -
                                  def_field->table->record[0]));
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    set_field(def_field);
  }
  else
  {
8256
    Field *tmp_field= field_arg->field;
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8257
    /* charset doesn't matter here, it's to avoid sigsegv only */
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    tmp_field= new Field_null(0, 0, Field::NONE, field_arg->field->field_name,
                          &my_charset_bin);
    if (tmp_field)
    {
      tmp_field->init(field_arg->field->table);
      set_field(tmp_field);
    }
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  }
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  return FALSE;
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}

8269
void Item_insert_value::print(String *str, enum_query_type query_type)
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8270
{
8271
  str->append(STRING_WITH_LEN("values("));
8272
  arg->print(str, query_type);
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  str->append(')');
}

8276

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/**
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  Find index of Field object which will be appropriate for item
  representing field of row being changed in trigger.
8280

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  @param thd     current thread context
  @param table   table of trigger (and where we looking for fields)
  @param table_grant_info   GRANT_INFO of the subject table
8284

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  @note
8286
    This function does almost the same as fix_fields() for Item_field
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    but is invoked right after trigger definition parsing. Since at
    this stage we can't say exactly what Field object (corresponding
    to TABLE::record[0] or TABLE::record[1]) should be bound to this
    Item, we only find out index of the Field and then select concrete
    Field object in fix_fields() (by that time Table_trigger_list::old_field/
    new_field should point to proper array of Fields).
    It also binds Item_trigger_field to Table_triggers_list object for
    table of trigger which uses this item.
8295
*/
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8296

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void Item_trigger_field::setup_field(THD *thd, TABLE *table,
                                     GRANT_INFO *table_grant_info)
8299
{
8300
  /*
8301 8302 8303 8304 8305
    It is too early to mark fields used here, because before execution
    of statement that will invoke trigger other statements may use same
    TABLE object, so all such mark-up will be wiped out.
    So instead we do it in Table_triggers_list::mark_fields_used()
    method which is called during execution of these statements.
8306
  */
8307 8308
  enum_mark_columns save_mark_used_columns= thd->mark_used_columns;
  thd->mark_used_columns= MARK_COLUMNS_NONE;
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  /*
    Try to find field by its name and if it will be found
    set field_idx properly.
  */
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  (void)find_field_in_table(thd, table, field_name, (uint) strlen(field_name),
8314
                            0, &field_idx);
8315
  thd->mark_used_columns= save_mark_used_columns;
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  triggers= table->triggers;
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  table_grants= table_grant_info;
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}


bool Item_trigger_field::eq(const Item *item, bool binary_cmp) const
{
  return item->type() == TRIGGER_FIELD_ITEM &&
         row_version == ((Item_trigger_field *)item)->row_version &&
         !my_strcasecmp(system_charset_info, field_name,
                        ((Item_trigger_field *)item)->field_name);
}


8330
void Item_trigger_field::set_required_privilege(bool rw)
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{
  /*
    Require SELECT and UPDATE privilege if this field will be read and
    set, and only UPDATE privilege for setting the field.
  */
  want_privilege= (rw ? SELECT_ACL | UPDATE_ACL : UPDATE_ACL);
}


8340
bool Item_trigger_field::set_value(THD *thd, sp_rcontext * /*ctx*/, Item **it)
8341
{
8342
  Item *item= sp_prepare_func_item(thd, it);
8343

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  if (!item)
    return true;

  if (!fixed)
  {
    if (fix_fields(thd, NULL))
      return true;
  }

  // NOTE: field->table->copy_blobs should be false here, but let's
  // remember the value at runtime to avoid subtle bugs.
  bool copy_blobs_saved= field->table->copy_blobs;

  field->table->copy_blobs= true;

  int err_code= item->save_in_field(field, 0);

  field->table->copy_blobs= copy_blobs_saved;

  return err_code < 0;
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}


8367
bool Item_trigger_field::fix_fields(THD *thd, Item **items)
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{
  /*
    Since trigger is object tightly associated with TABLE object most
    of its set up can be performed during trigger loading i.e. trigger
    parsing! So we have little to do in fix_fields. :)
  */
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8375
  DBUG_ASSERT(fixed == 0);
8376

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  /* Set field. */

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  if (field_idx != (uint)-1)
8380
  {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    /*
      Check access privileges for the subject table. We check privileges only
      in runtime.
    */

    if (table_grants)
    {
8389
      table_grants->want_privilege= want_privilege;
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8390

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      if (check_grant_column(thd, table_grants, triggers->trigger_table->s->db.str,
                             triggers->trigger_table->s->table_name.str, field_name,
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                             strlen(field_name), thd->security_ctx))
        return TRUE;
    }
#endif // NO_EMBEDDED_ACCESS_CHECKS

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    field= (row_version == OLD_ROW) ? triggers->old_field[field_idx] :
                                      triggers->new_field[field_idx];
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    set_field(field);
    fixed= 1;
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    return FALSE;
8403 8404 8405 8406
  }

  my_error(ER_BAD_FIELD_ERROR, MYF(0), field_name,
           (row_version == NEW_ROW) ? "NEW" : "OLD");
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8407
  return TRUE;
8408 8409 8410
}


8411
void Item_trigger_field::print(String *str, enum_query_type query_type)
8412 8413 8414 8415 8416 8417 8418 8419 8420
{
  str->append((row_version == NEW_ROW) ? "NEW" : "OLD", 3);
  str->append('.');
  str->append(field_name);
}


void Item_trigger_field::cleanup()
{
8421
  want_privilege= original_privilege;
8422 8423 8424 8425 8426 8427 8428 8429
  /*
    Since special nature of Item_trigger_field we should not do most of
    things from Item_field::cleanup() or Item_ident::cleanup() here.
  */
  Item::cleanup();
}


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8430 8431 8432 8433
Item_result item_cmp_type(Item_result a,Item_result b)
{
  if (a == STRING_RESULT && b == STRING_RESULT)
    return STRING_RESULT;
8434
  if (a == INT_RESULT && b == INT_RESULT)
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8435
    return INT_RESULT;
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8436 8437
  else if (a == ROW_RESULT || b == ROW_RESULT)
    return ROW_RESULT;
8438 8439
  else if (a == TIME_RESULT || b == TIME_RESULT)
    return TIME_RESULT;
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8440 8441 8442
  if ((a == INT_RESULT || a == DECIMAL_RESULT) &&
      (b == INT_RESULT || b == DECIMAL_RESULT))
    return DECIMAL_RESULT;
8443
  return REAL_RESULT;
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8444 8445 8446
}


8447
void resolve_const_item(THD *thd, Item **ref, Item *comp_item)
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8448
{
8449
  Item *item= *ref;
8450
  Item *new_item= NULL;
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8451
  if (item->basic_const_item())
8452
    return;                                     // Can't be better
8453
  Item_result res_type=item_cmp_type(comp_item->cmp_type(), item->cmp_type());
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8454 8455
  char *name=item->name;			// Alloced by sql_alloc

8456
  switch (res_type) {
8457 8458 8459 8460
  case TIME_RESULT:
  {
    bool is_null;
    Item **ref_copy= ref;
Sergei Golubchik's avatar
Sergei Golubchik committed
8461
    /* the following call creates a constant and puts it in new_item */
8462 8463 8464
    get_datetime_value(thd, &ref_copy, &new_item, comp_item, &is_null);
    if (is_null)
      new_item= new Item_null(name);
8465
    break;
8466
  }
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8467
  case STRING_RESULT:
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8468 8469
  {
    char buff[MAX_FIELD_WIDTH];
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8470
    String tmp(buff,sizeof(buff),&my_charset_bin),*result;
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8471 8472
    result=item->val_str(&tmp);
    if (item->null_value)
8473 8474 8475 8476 8477 8478 8479
      new_item= new Item_null(name);
    else
    {
      uint length= result->length();
      char *tmp_str= sql_strmake(result->ptr(), length);
      new_item= new Item_string(name, tmp_str, length, result->charset());
    }
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8480
    break;
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8481
  }
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8482
  case INT_RESULT:
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8483 8484 8485 8486
  {
    longlong result=item->val_int();
    uint length=item->max_length;
    bool null_value=item->null_value;
8487 8488
    new_item= (null_value ? (Item*) new Item_null(name) :
               (Item*) new Item_int(name, result, length));
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8489
    break;
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8490
  }
8491
  case ROW_RESULT:
8492
  if (item->type() == Item::ROW_ITEM && comp_item->type() == Item::ROW_ITEM)
8493
  {
8494 8495 8496 8497 8498 8499 8500 8501
    /*
      Substitute constants only in Item_rows. Don't affect other Items
      with ROW_RESULT (eg Item_singlerow_subselect).

      For such Items more optimal is to detect if it is constant and replace
      it with Item_row. This would optimize queries like this:
      SELECT * FROM t1 WHERE (a,b) = (SELECT a,b FROM t2 LIMIT 1);
    */
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8502 8503 8504
    Item_row *item_row= (Item_row*) item;
    Item_row *comp_item_row= (Item_row*) comp_item;
    uint col;
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    new_item= 0;
    /*
      If item and comp_item are both Item_rows and have same number of cols
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8508 8509 8510
      then process items in Item_row one by one.
      We can't ignore NULL values here as this item may be used with <=>, in
      which case NULL's are significant.
8511
    */
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8512 8513 8514 8515
    DBUG_ASSERT(item->result_type() == comp_item->result_type());
    DBUG_ASSERT(item_row->cols() == comp_item_row->cols());
    col= item_row->cols();
    while (col-- > 0)
8516 8517
      resolve_const_item(thd, item_row->addr(col),
                         comp_item_row->element_index(col));
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8518
    break;
8519
  }
8520
  /* Fallthrough */
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8521
  case REAL_RESULT:
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8522
  {						// It must REAL_RESULT
8523
    double result= item->val_real();
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8524 8525
    uint length=item->max_length,decimals=item->decimals;
    bool null_value=item->null_value;
8526
    new_item= (null_value ? (Item*) new Item_null(name) : (Item*)
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8527 8528 8529 8530 8531 8532 8533 8534 8535 8536 8537 8538 8539 8540
               new Item_float(name, result, decimals, length));
    break;
  }
  case DECIMAL_RESULT:
  {
    my_decimal decimal_value;
    my_decimal *result= item->val_decimal(&decimal_value);
    uint length= item->max_length, decimals= item->decimals;
    bool null_value= item->null_value;
    new_item= (null_value ?
               (Item*) new Item_null(name) :
               (Item*) new Item_decimal(name, result, length, decimals));
    break;
  }
8541
  case IMPOSSIBLE_RESULT:
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8542
    DBUG_ASSERT(0);
8543
    break;
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8544
  }
8545 8546
  if (new_item)
    thd->change_item_tree(ref, new_item);
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8547 8548
}

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8549
/**
8550
  Compare the value stored in field with the expression from the query.
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8551

8552 8553
  @param field   Field which the Item is stored in after conversion
  @param item    Original expression from query
8554

8555 8556 8557 8558
  @return Returns an integer greater than, equal to, or less than 0 if
          the value stored in the field is greater than, equal to,
          or less than the original Item. A 0 may also be returned if 
          out of memory.          
8559

8560
  @note We use this in the range optimizer/partition pruning,
8561 8562
        because in some cases we can't store the value in the field
        without some precision/character loss.
8563

8564 8565 8566
        We similarly use it to verify that expressions like
        BIGINT_FIELD <cmp> <literal value>
        is done correctly (as int/decimal/float according to literal type).
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8567

8568 8569
  @todo rewrite it to use Arg_comparator (currently it's a simplified and
        incomplete version of it)
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8570 8571
*/

8572
int stored_field_cmp_to_item(THD *thd, Field *field, Item *item)
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8573 8574 8575 8576 8577 8578 8579
{
  Item_result res_type=item_cmp_type(field->result_type(),
				     item->result_type());
  if (res_type == STRING_RESULT)
  {
    char item_buff[MAX_FIELD_WIDTH];
    char field_buff[MAX_FIELD_WIDTH];
8580 8581
    
    String item_tmp(item_buff,sizeof(item_buff),&my_charset_bin);
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8582
    String field_tmp(field_buff,sizeof(field_buff),&my_charset_bin);
8583 8584 8585 8586 8587
    String *item_result= item->val_str(&item_tmp);
    /*
      Some implementations of Item::val_str(String*) actually modify
      the field Item::null_value, hence we can't check it earlier.
    */
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8588
    if (item->null_value)
8589
      return 0;
8590
    String *field_result= field->val_str(&field_tmp);
8591

8592 8593
    enum_field_types field_type= field->type();

8594 8595
    if (field_type == MYSQL_TYPE_DATE || field_type == MYSQL_TYPE_DATETIME ||
        field_type == MYSQL_TYPE_TIMESTAMP)
8596
    {
8597 8598 8599 8600
      enum_mysql_timestamp_type type= MYSQL_TIMESTAMP_ERROR;

      if (field_type == MYSQL_TYPE_DATE)
        type= MYSQL_TIMESTAMP_DATE;
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Michael Widenius committed
8601
      else
8602 8603 8604 8605 8606 8607 8608 8609
        type= MYSQL_TIMESTAMP_DATETIME;
        
      const char *field_name= field->field_name;
      MYSQL_TIME field_time, item_time;
      get_mysql_time_from_str(thd, field_result, type, field_name, &field_time);
      get_mysql_time_from_str(thd, item_result, type, field_name,  &item_time);

      return my_time_compare(&field_time, &item_time);
8610
    }
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Guilhem Bichot committed
8611
    return sortcmp(field_result, item_result, field->charset());
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8612 8613
  }
  if (res_type == INT_RESULT)
8614
    return 0;					// Both are of type int
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8615 8616 8617 8618 8619 8620
  if (res_type == DECIMAL_RESULT)
  {
    my_decimal item_buf, *item_val,
               field_buf, *field_val;
    item_val= item->val_decimal(&item_buf);
    if (item->null_value)
8621
      return 0;
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8622
    field_val= field->val_decimal(&field_buf);
Guilhem Bichot's avatar
Guilhem Bichot committed
8623
    return my_decimal_cmp(field_val, item_val);
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8624
  }
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Sergei Golubchik committed
8625 8626 8627 8628
  /*
    We have to check field->cmp_type() instead of res_type,
    as result_type() - and thus res_type - can never be TIME_RESULT (yet).
  */
8629 8630
  if (field->cmp_type() == TIME_RESULT)
  {
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8631 8632 8633 8634 8635 8636 8637 8638 8639 8640 8641 8642
    MYSQL_TIME field_time, item_time;
    if (field->type() == MYSQL_TYPE_TIME)
    {
      field->get_time(&field_time);
      item->get_time(&item_time);
    }
    else
    {
      field->get_date(&field_time, TIME_FUZZY_DATE | TIME_INVALID_DATES);
      item->get_date(&item_time, TIME_FUZZY_DATE | TIME_INVALID_DATES);
    }
    return my_time_compare(&field_time, &item_time);
8643
  }
8644 8645 8646 8647 8648 8649
  /*
    The patch for Bug#13463415 started using this function for comparing
    BIGINTs. That uncovered a bug in Visual Studio 32bit optimized mode.
    Prefixing the auto variables with volatile fixes the problem....
  */
  volatile double result= item->val_real();
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8650
  if (item->null_value)
8651
    return 0;
8652
  volatile double field_result= field->val_real();
8653 8654 8655
  if (field_result < result)
    return -1;
  else if (field_result > result)
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8656
    return 1;
8657
  return 0;
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8658 8659
}

8660
Item_cache* Item_cache::get_cache(const Item *item)
8661
{
8662
  return get_cache(item, item->cmp_type());
8663 8664 8665 8666 8667 8668 8669 8670 8671 8672 8673 8674 8675 8676 8677
}


/**
  Get a cache item of given type.

  @param item         value to be cached
  @param type         required type of cache

  @return cache item
*/

Item_cache* Item_cache::get_cache(const Item *item, const Item_result type)
{
  switch (type) {
8678
  case INT_RESULT:
8679
    return new Item_cache_int(item->field_type());
8680 8681
  case REAL_RESULT:
    return new Item_cache_real();
unknown's avatar
unknown committed
8682 8683
  case DECIMAL_RESULT:
    return new Item_cache_decimal();
8684
  case STRING_RESULT:
8685
    return new Item_cache_str(item);
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8686 8687
  case ROW_RESULT:
    return new Item_cache_row();
8688
  case TIME_RESULT:
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Sergei Golubchik committed
8689
    return new Item_cache_temporal(item->field_type());
8690
  case IMPOSSIBLE_RESULT:
8691
    DBUG_ASSERT(0);
8692
    break;
8693
  }
8694
  return 0;                                     // Impossible
8695 8696
}

8697 8698
void Item_cache::store(Item *item)
{
8699 8700 8701
  example= item;
  if (!item)
    null_value= TRUE;
8702 8703
  value_cached= FALSE;
}
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8704

8705
void Item_cache::print(String *str, enum_query_type query_type)
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8706
{
8707 8708 8709 8710 8711
  if (value_cached)
  {
    print_value(str);
    return;
  }
8712
  str->append(STRING_WITH_LEN("<cache>("));
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8713
  if (example)
8714
    example->print(str, query_type);
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8715
  else
8716
    Item::print(str, query_type);
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8717 8718 8719
  str->append(')');
}

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8720 8721 8722 8723 8724 8725 8726 8727 8728 8729 8730 8731 8732 8733
/**
  Assign to this cache NULL value if it is possible
*/

void Item_cache::set_null()
{
  if (maybe_null)
  {
    null_value= TRUE;
    value_cached= TRUE;
  }
}


8734
bool  Item_cache_int::cache_value()
unknown's avatar
unknown committed
8735
{
8736 8737
  if (!example)
    return FALSE;
8738 8739 8740 8741
  value_cached= TRUE;
  value= example->val_int_result();
  null_value= example->null_value;
  unsigned_flag= example->unsigned_flag;
8742
  return TRUE;
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8743 8744 8745 8746 8747 8748
}


String *Item_cache_int::val_str(String *str)
{
  DBUG_ASSERT(fixed == 1);
8749
  if (!has_value())
8750
    return NULL;
8751
  str->set_int(value, unsigned_flag, default_charset());
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8752 8753 8754 8755 8756 8757 8758
  return str;
}


my_decimal *Item_cache_int::val_decimal(my_decimal *decimal_val)
{
  DBUG_ASSERT(fixed == 1);
8759
  if (!has_value())
8760
    return NULL;
unknown's avatar
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8761 8762
  int2my_decimal(E_DEC_FATAL_ERROR, value, unsigned_flag, decimal_val);
  return decimal_val;
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8763 8764
}

8765 8766 8767
double Item_cache_int::val_real()
{
  DBUG_ASSERT(fixed == 1);
8768
  if (!has_value())
8769
    return 0.0;
8770 8771
  return (double) value;
}
unknown's avatar
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8772

8773
longlong Item_cache_int::val_int()
unknown's avatar
unknown committed
8774
{
8775
  DBUG_ASSERT(fixed == 1);
8776
  if (!has_value())
8777
    return 0;
8778
  return value;
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8779 8780
}

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8781
int Item_cache_int::save_in_field(Field *field, bool no_conversions)
8782
{
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8783
  int error;
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8784
  if (!has_value())
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Sergei Golubchik committed
8785
    return set_field_to_null_with_conversions(field, no_conversions);
8786

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Sergei Golubchik committed
8787 8788
  field->set_notnull();
  error= field->store(value, unsigned_flag);
8789

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Sergei Golubchik committed
8790
  return error ? error : field->table->in_use->is_error() ? 1 : 0;
8791 8792 8793
}


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Sergei Golubchik committed
8794 8795
Item_cache_temporal::Item_cache_temporal(enum_field_types field_type_arg):
  Item_cache_int(field_type_arg)
8796
{
Sergei Golubchik's avatar
Sergei Golubchik committed
8797 8798
  if (mysql_type_to_time_type(cached_field_type) == MYSQL_TIMESTAMP_ERROR)
    cached_field_type= MYSQL_TYPE_DATETIME;
8799 8800 8801
}


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Sergei Golubchik committed
8802
String *Item_cache_temporal::val_str(String *str)
8803
{
Sergei Golubchik's avatar
Sergei Golubchik committed
8804
  DBUG_ASSERT(fixed == 1);
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Sergei Golubchik committed
8805
  if (!has_value())
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8806 8807 8808 8809 8810
  {
    null_value= true;
    return NULL;
  }
  return val_string_from_date(str);
8811 8812 8813
}


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Sergei Golubchik committed
8814
bool  Item_cache_temporal::cache_value()
8815
{
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8816 8817
  if (!example)
    return false;
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8818

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8819 8820 8821
  value_cached= true;
 
  MYSQL_TIME ltime;
8822
  if (example->get_date_result(&ltime, TIME_FUZZY_DATE))
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8823 8824 8825 8826 8827
    value=0;
  else
    value= pack_time(&ltime);
  null_value= example->null_value;
  return true;
8828 8829
}

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8830

8831
bool Item_cache_temporal::get_date(MYSQL_TIME *ltime, ulonglong fuzzydate)
8832
{
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8833
  ErrConvInteger str(value);
8834

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8835
  if (!has_value())
8836 8837 8838 8839
  {
    bzero((char*) ltime,sizeof(*ltime));
    return 1;
  }
8840

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Sergei Golubchik committed
8841 8842 8843
  unpack_time(value, ltime);
  ltime->time_type= mysql_type_to_time_type(field_type());
  if (ltime->time_type == MYSQL_TIMESTAMP_TIME)
8844
  {
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8845 8846
    ltime->hour+= (ltime->month*32+ltime->day)*24;
    ltime->month= ltime->day= 0;
8847
  }
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Sergei Golubchik committed
8848 8849
  return 0;
 
8850 8851 8852
}


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Sergei Golubchik committed
8853
int Item_cache_temporal::save_in_field(Field *field, bool no_conversions)
8854
{
8855
  int error;
8856
  if (!has_value())
8857
    return set_field_to_null_with_conversions(field, no_conversions);
8858

8859
  field->set_notnull();
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8860 8861 8862 8863 8864 8865
 
  MYSQL_TIME ltime;
  unpack_time(value, &ltime);
  ltime.time_type= mysql_type_to_time_type(field_type());
  error= field->store_time_dec(&ltime, decimals);
 
8866
  return error ? error : field->table->in_use->is_error() ? 1 : 0;
8867 8868
}

8869

8870
void Item_cache_temporal::store_packed(longlong val_arg, Item *example)
8871
{
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8872
  /* An explicit values is given, save it. */
8873
  store(example);
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  value_cached= true;
  value= val_arg;
  null_value= false;
8877 8878
}

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Sergei Golubchik committed
8879

8880
bool Item_cache_real::cache_value()
8881
{
8882 8883
  if (!example)
    return FALSE;
8884 8885 8886
  value_cached= TRUE;
  value= example->val_result();
  null_value= example->null_value;
8887
  return TRUE;
8888 8889 8890 8891 8892 8893
}


double Item_cache_real::val_real()
{
  DBUG_ASSERT(fixed == 1);
8894
  if (!has_value())
8895
    return 0.0;
8896 8897
  return value;
}
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unknown committed
8898

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8899 8900 8901
longlong Item_cache_real::val_int()
{
  DBUG_ASSERT(fixed == 1);
8902
  if (!has_value())
8903
    return 0;
8904
  return (longlong) rint(value);
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8905 8906 8907 8908 8909 8910
}


String* Item_cache_real::val_str(String *str)
{
  DBUG_ASSERT(fixed == 1);
8911
  if (!has_value())
8912
    return NULL;
8913
  str->set_real(value, decimals, default_charset());
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  return str;
}


my_decimal *Item_cache_real::val_decimal(my_decimal *decimal_val)
{
  DBUG_ASSERT(fixed == 1);
8921
  if (!has_value())
8922
    return NULL;
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  double2my_decimal(E_DEC_FATAL_ERROR, value, decimal_val);
  return decimal_val;
}


8928
bool Item_cache_decimal::cache_value()
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unknown committed
8929
{
8930 8931
  if (!example)
    return FALSE;
8932 8933 8934
  value_cached= TRUE;
  my_decimal *val= example->val_decimal_result(&decimal_value);
  if (!(null_value= example->null_value) && val != &decimal_value)
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8935
    my_decimal2decimal(val, &decimal_value);
8936
  return TRUE;
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8937 8938 8939 8940 8941 8942
}

double Item_cache_decimal::val_real()
{
  DBUG_ASSERT(fixed);
  double res;
8943
  if (!has_value())
8944
    return 0.0;
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8945 8946 8947 8948 8949 8950 8951 8952
  my_decimal2double(E_DEC_FATAL_ERROR, &decimal_value, &res);
  return res;
}

longlong Item_cache_decimal::val_int()
{
  DBUG_ASSERT(fixed);
  longlong res;
8953
  if (!has_value())
8954
    return 0;
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8955 8956 8957 8958 8959 8960 8961
  my_decimal2int(E_DEC_FATAL_ERROR, &decimal_value, unsigned_flag, &res);
  return res;
}

String* Item_cache_decimal::val_str(String *str)
{
  DBUG_ASSERT(fixed);
8962
  if (!has_value())
8963
    return NULL;
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8964 8965 8966 8967 8968 8969 8970 8971 8972
  my_decimal_round(E_DEC_FATAL_ERROR, &decimal_value, decimals, FALSE,
                   &decimal_value);
  my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value, 0, 0, 0, str);
  return str;
}

my_decimal *Item_cache_decimal::val_decimal(my_decimal *val)
{
  DBUG_ASSERT(fixed);
8973
  if (!has_value())
8974
    return NULL;
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  return &decimal_value;
}


8979
bool Item_cache_str::cache_value()
8980
{
8981 8982
  if (!example)
    return FALSE;
8983 8984 8985 8986
  value_cached= TRUE;
  value_buff.set(buffer, sizeof(buffer), example->collation.collation);
  value= example->str_result(&value_buff);
  if ((null_value= example->null_value))
8987
    value= 0;
8988
  else if (value != &value_buff)
8989 8990 8991 8992 8993 8994 8995 8996 8997
  {
    /*
      We copy string value to avoid changing value if 'item' is table field
      in queries like following (where t1.c is varchar):
      select a, 
             (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),
             (select c from t1 where a=t2.a)
        from t2;
    */
8998 8999
    value_buff.copy(*value);
    value= &value_buff;
9000
  }
9001
  return TRUE;
9002
}
9003

9004
double Item_cache_str::val_real()
9005 9006
{
  DBUG_ASSERT(fixed == 1);
9007 9008
  int err_not_used;
  char *end_not_used;
9009
  if (!has_value())
9010
    return 0.0;
9011
  if (value)
9012
    return my_strntod(value->charset(), (char*) value->ptr(),
9013 9014
		      value->length(), &end_not_used, &err_not_used);
  return (double) 0;
9015
}
9016 9017


9018 9019
longlong Item_cache_str::val_int()
{
9020
  DBUG_ASSERT(fixed == 1);
9021
  int err;
9022
  if (!has_value())
9023
    return 0;
9024 9025
  if (value)
    return my_strntoll(value->charset(), value->ptr(),
9026
		       value->length(), 10, (char**) 0, &err);
9027 9028 9029
  else
    return (longlong)0;
}
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9031 9032 9033 9034

String* Item_cache_str::val_str(String *str)
{
  DBUG_ASSERT(fixed == 1);
9035
  if (!has_value())
9036
    return 0;
9037 9038 9039 9040
  return value;
}


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9041 9042 9043
my_decimal *Item_cache_str::val_decimal(my_decimal *decimal_val)
{
  DBUG_ASSERT(fixed == 1);
9044
  if (!has_value())
9045
    return NULL;
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  if (value)
    string2my_decimal(E_DEC_FATAL_ERROR, value, decimal_val);
  else
    decimal_val= 0;
  return decimal_val;
}

9053

9054 9055
int Item_cache_str::save_in_field(Field *field, bool no_conversions)
{
9056
  if (!has_value())
9057
    return set_field_to_null_with_conversions(field, no_conversions);
9058 9059 9060 9061 9062 9063
  int res= Item_cache::save_in_field(field, no_conversions);
  return (is_varbinary && field->type() == MYSQL_TYPE_STRING &&
          value->length() < field->field_length) ? 1 : res;
}


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bool Item_cache_row::allocate(uint num)
{
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  item_count= num;
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  THD *thd= current_thd;
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  return (!(values= 
	    (Item_cache **) thd->calloc(sizeof(Item_cache *)*item_count)));
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}

9072

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bool Item_cache_row::setup(Item * item)
{
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  example= item;
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  if (!values && allocate(item->cols()))
    return 1;
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  for (uint i= 0; i < item_count; i++)
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  {
9080
    Item *el= item->element_index(i);
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9081
    Item_cache *tmp;
9082
    if (!(tmp= values[i]= Item_cache::get_cache(el)))
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      return 1;
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    tmp->setup(el);
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  }
  return 0;
}

9089

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9090 9091
void Item_cache_row::store(Item * item)
{
9092 9093 9094 9095 9096 9097
  example= item;
  if (!item)
  {
    null_value= TRUE;
    return;
  }
9098 9099 9100 9101 9102
  for (uint i= 0; i < item_count; i++)
    values[i]->store(item->element_index(i));
}


9103
bool Item_cache_row::cache_value()
9104
{
9105 9106
  if (!example)
    return FALSE;
9107
  value_cached= TRUE;
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9108
  null_value= 0;
9109
  example->bring_value();
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9110
  for (uint i= 0; i < item_count; i++)
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9111
  {
9112
    values[i]->cache_value();
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9113 9114
    null_value|= values[i]->null_value;
  }
9115
  return TRUE;
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}

9118

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void Item_cache_row::illegal_method_call(const char *method)
{
  DBUG_ENTER("Item_cache_row::illegal_method_call");
  DBUG_PRINT("error", ("!!! %s method was called for row item", method));
  DBUG_ASSERT(0);
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9124
  my_error(ER_OPERAND_COLUMNS, MYF(0), 1);
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9125 9126 9127
  DBUG_VOID_RETURN;
}

9128

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9129 9130
bool Item_cache_row::check_cols(uint c)
{
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9131
  if (c != item_count)
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  {
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    my_error(ER_OPERAND_COLUMNS, MYF(0), c);
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9134 9135 9136 9137 9138
    return 1;
  }
  return 0;
}

9139

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bool Item_cache_row::null_inside()
{
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9142
  for (uint i= 0; i < item_count; i++)
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9143 9144 9145 9146 9147 9148 9149 9150
  {
    if (values[i]->cols() > 1)
    {
      if (values[i]->null_inside())
	return 1;
    }
    else
    {
9151
      values[i]->update_null_value();
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9152 9153 9154 9155 9156 9157 9158
      if (values[i]->null_value)
	return 1;
    }
  }
  return 0;
}

9159

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9160 9161
void Item_cache_row::bring_value()
{
9162 9163 9164 9165
  if (!example)
    return;
  example->bring_value();
  null_value= example->null_value;
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9166
  for (uint i= 0; i < item_count; i++)
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9167 9168
    values[i]->bring_value();
}
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9169

9170

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/**
  Assign to this cache NULL value if it is possible
*/

void Item_cache_row::set_null()
{
  Item_cache::set_null();
  if (!values)
    return;
  for (uint i= 0; i < item_count; i++)
    values[i]->set_null();
};


9185 9186
Item_type_holder::Item_type_holder(THD *thd, Item *item)
  :Item(thd, item), enum_set_typelib(0), fld_type(get_real_type(item))
9187 9188
{
  DBUG_ASSERT(item->fixed);
9189
  maybe_null= item->maybe_null;
9190
  collation.set(item->collation);
9191
  get_full_info(item);
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9192 9193 9194
  /* fix variable decimals which always is NOT_FIXED_DEC */
  if (Field::result_merge_type(fld_type) == INT_RESULT)
    decimals= 0;
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9195
  prev_decimal_int_part= item->decimal_int_part();
9196
#ifdef HAVE_SPATIAL
9197
  if (item->field_type() == MYSQL_TYPE_GEOMETRY)
9198
    geometry_type= item->get_geometry_type();
9199
#endif /* HAVE_SPATIAL */
9200 9201 9202
}


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9203 9204
/**
  Return expression type of Item_type_holder.
9205

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9206 9207
  @return
    Item_result (type of internal MySQL expression result)
9208 9209
*/

9210
Item_result Item_type_holder::result_type() const
9211
{
9212
  return Field::result_merge_type(fld_type);
9213
}
9214

9215

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9216 9217
/**
  Find real field type of item.
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9218

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9219
  @return
9220
    type of field which should be created to store item value
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9221 9222
*/

9223
enum_field_types Item_type_holder::get_real_type(Item *item)
9224
{
9225 9226
  if (item->type() == REF_ITEM)
    item= item->real_item();
9227
  switch(item->type())
9228
  {
9229
  case FIELD_ITEM:
9230
  {
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9231
    /*
9232
      Item_field::field_type ask Field_type() but sometimes field return
9233
      a different type, like for enum/set, so we need to ask real type.
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9234
    */
9235 9236
    Field *field= ((Item_field *) item)->field;
    enum_field_types type= field->real_type();
9237 9238
    if (field->is_created_from_null_item)
      return MYSQL_TYPE_NULL;
9239 9240 9241 9242
    /* work around about varchar type field detection */
    if (type == MYSQL_TYPE_STRING && field->type() == MYSQL_TYPE_VAR_STRING)
      return MYSQL_TYPE_VAR_STRING;
    return type;
9243
  }
9244
  case SUM_FUNC_ITEM:
9245
  {
9246 9247 9248 9249
    /*
      Argument of aggregate function sometimes should be asked about field
      type
    */
9250 9251
    Item_sum *item_sum= (Item_sum *) item;
    if (item_sum->keep_field_type())
9252
      return get_real_type(item_sum->get_arg(0));
9253 9254 9255
    break;
  }
  case FUNC_ITEM:
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9256
    if (((Item_func *) item)->functype() == Item_func::GUSERVAR_FUNC)
9257
    {
9258
      /*
9259 9260 9261 9262
        There are work around of problem with changing variable type on the
        fly and variable always report "string" as field type to get
        acceptable information for client in send_field, so we make field
        type from expression type.
9263
      */
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9264
      switch (item->result_type()) {
9265 9266 9267 9268 9269 9270
      case STRING_RESULT:
        return MYSQL_TYPE_VAR_STRING;
      case INT_RESULT:
        return MYSQL_TYPE_LONGLONG;
      case REAL_RESULT:
        return MYSQL_TYPE_DOUBLE;
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9271 9272
      case DECIMAL_RESULT:
        return MYSQL_TYPE_NEWDECIMAL;
9273
      case ROW_RESULT:
Sergei Golubchik's avatar
Sergei Golubchik committed
9274
      case TIME_RESULT:
9275
      case IMPOSSIBLE_RESULT:
9276 9277 9278
        DBUG_ASSERT(0);
        return MYSQL_TYPE_VAR_STRING;
      }
9279
    }
9280 9281 9282
    break;
  default:
    break;
9283
  }
9284
  return item->field_type();
9285 9286
}

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9287
/**
9288 9289
  Find field type which can carry current Item_type_holder type and
  type of given Item.
9290

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9291 9292
  @param thd     thread handler
  @param item    given item to join its parameters with this item ones
9293

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9294
  @retval
9295
    TRUE   error - types are incompatible
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9296
  @retval
9297
    FALSE  OK
9298 9299
*/

9300
bool Item_type_holder::join_types(THD *thd, Item *item)
9301
{
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9302 9303
  uint max_length_orig= max_length;
  uint decimals_orig= decimals;
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9304 9305 9306 9307 9308 9309 9310
  DBUG_ENTER("Item_type_holder::join_types");
  DBUG_PRINT("info:", ("was type %d len %d, dec %d name %s",
                       fld_type, max_length, decimals,
                       (name ? name : "<NULL>")));
  DBUG_PRINT("info:", ("in type %d len %d, dec %d",
                       get_real_type(item),
                       item->max_length, item->decimals));
9311
  fld_type= Field::field_type_merge(fld_type, get_real_type(item));
9312
  {
9313
    uint item_decimals= item->decimals;
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9314 9315 9316 9317
    /* fix variable decimals which always is NOT_FIXED_DEC */
    if (Field::result_merge_type(fld_type) == INT_RESULT)
      item_decimals= 0;
    decimals= max(decimals, item_decimals);
9318
  }
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9319
  if (Field::result_merge_type(fld_type) == DECIMAL_RESULT)
9320
  {
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9321
    decimals= min(max(decimals, item->decimals), DECIMAL_MAX_SCALE);
9322 9323 9324
    int item_int_part= item->decimal_int_part();
    int item_prec = max(prev_decimal_int_part, item_int_part) + decimals;
    int precision= min(item_prec, DECIMAL_MAX_PRECISION);
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9325
    unsigned_flag&= item->unsigned_flag;
9326 9327 9328
    max_length= my_decimal_precision_to_length_no_truncation(precision,
                                                             decimals,
                                                             unsigned_flag);
9329
  }
9330

unknown's avatar
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9331 9332 9333
  switch (Field::result_merge_type(fld_type))
  {
  case STRING_RESULT:
9334
  {
9335
    const char *old_cs, *old_derivation;
9336
    uint32 old_max_chars= max_length / collation.collation->mbmaxlen;
9337 9338
    old_cs= collation.collation->name;
    old_derivation= collation.derivation_name();
9339
    if (collation.aggregate(item->collation, MY_COLL_ALLOW_CONV))
9340
    {
9341
      my_error(ER_CANT_AGGREGATE_2COLLATIONS, MYF(0),
9342 9343 9344 9345
	       old_cs, old_derivation,
	       item->collation.collation->name,
	       item->collation.derivation_name(),
	       "UNION");
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9346
      DBUG_RETURN(TRUE);
9347
    }
9348 9349 9350 9351 9352
    /*
      To figure out max_length, we have to take into account possible
      expansion of the size of the values because of character set
      conversions.
     */
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9353 9354 9355 9356 9357 9358 9359 9360 9361
    if (collation.collation != &my_charset_bin)
    {
      max_length= max(old_max_chars * collation.collation->mbmaxlen,
                      display_length(item) /
                      item->collation.collation->mbmaxlen *
                      collation.collation->mbmaxlen);
    }
    else
      set_if_bigger(max_length, display_length(item));
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9362
    break;
9363
  }
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9364 9365 9366 9367
  case REAL_RESULT:
  {
    if (decimals != NOT_FIXED_DEC)
    {
9368 9369 9370 9371 9372 9373
      /*
        For FLOAT(M,D)/DOUBLE(M,D) do not change precision
         if both fields have the same M and D
      */
      if (item->max_length != max_length_orig ||
          item->decimals != decimals_orig)
9374
      {
9375 9376 9377 9378 9379 9380 9381 9382 9383 9384 9385 9386 9387
        int delta1= max_length_orig - decimals_orig;
        int delta2= item->max_length - item->decimals;
        max_length= max(delta1, delta2) + decimals;
        if (fld_type == MYSQL_TYPE_FLOAT && max_length > FLT_DIG + 2)
        {
          max_length= MAX_FLOAT_STR_LENGTH;
          decimals= NOT_FIXED_DEC;
        } 
        else if (fld_type == MYSQL_TYPE_DOUBLE && max_length > DBL_DIG + 2)
        {
          max_length= MAX_DOUBLE_STR_LENGTH;
          decimals= NOT_FIXED_DEC;
        }
9388
      }
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9389 9390 9391 9392
    }
    else
      max_length= (fld_type == MYSQL_TYPE_FLOAT) ? FLT_DIG+6 : DBL_DIG+7;
    break;
9393
  }
9394 9395
  default:
    max_length= max(max_length, display_length(item));
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9396
  };
9397 9398
  maybe_null|= item->maybe_null;
  get_full_info(item);
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9399 9400 9401

  /* Remember decimal integer part to be used in DECIMAL_RESULT handleng */
  prev_decimal_int_part= decimal_int_part();
9402 9403
  DBUG_PRINT("info", ("become type: %d  len: %u  dec: %u",
                      (int) fld_type, max_length, (uint) decimals));
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9404
  DBUG_RETURN(FALSE);
9405 9406
}

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9407 9408
/**
  Calculate lenth for merging result for given Item type.
9409

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9410
  @param item  Item for length detection
9411

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9412
  @return
9413 9414
    length
*/
9415

9416
uint32 Item_type_holder::display_length(Item *item)
9417 9418
{
  if (item->type() == Item::FIELD_ITEM)
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9419
    return ((Item_field *)item)->max_disp_length();
9420

9421
  switch (item->field_type())
9422
  {
9423 9424 9425 9426 9427 9428 9429
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_YEAR:
  case MYSQL_TYPE_NEWDATE:
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9430 9431 9432
  case MYSQL_TYPE_VARCHAR:
  case MYSQL_TYPE_BIT:
  case MYSQL_TYPE_NEWDECIMAL:
9433 9434 9435 9436 9437 9438 9439 9440 9441
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
  case MYSQL_TYPE_GEOMETRY:
9442
    return item->max_length;
9443 9444 9445 9446 9447
  case MYSQL_TYPE_TINY:
    return 4;
  case MYSQL_TYPE_SHORT:
    return 6;
  case MYSQL_TYPE_LONG:
9448
    return MY_INT32_NUM_DECIMAL_DIGITS;
9449 9450 9451
  case MYSQL_TYPE_FLOAT:
    return 25;
  case MYSQL_TYPE_DOUBLE:
9452
    return 53;
9453
  case MYSQL_TYPE_NULL:
9454
    return 0;
9455
  case MYSQL_TYPE_LONGLONG:
9456
    return 20;
9457 9458
  case MYSQL_TYPE_INT24:
    return 8;
9459 9460 9461 9462 9463
  default:
    DBUG_ASSERT(0); // we should never go there
    return 0;
  }
}
9464

9465

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9466
/**
9467
  Make temporary table field according collected information about type
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9468
  of UNION result.
9469

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9470
  @param table  temporary table for which we create fields
9471

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9472
  @return
9473 9474 9475 9476 9477
    created field
*/

Field *Item_type_holder::make_field_by_type(TABLE *table)
{
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9478 9479 9480 9481
  /*
    The field functions defines a field to be not null if null_ptr is not 0
  */
  uchar *null_ptr= maybe_null ? (uchar*) "" : 0;
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9482 9483 9484
  Field *field;

  switch (fld_type) {
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9485
  case MYSQL_TYPE_ENUM:
9486
    DBUG_ASSERT(enum_set_typelib);
9487
    field= new Field_enum((uchar *) 0, max_length, null_ptr, 0,
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9488
                          Field::NONE, name,
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9489
                          get_enum_pack_length(enum_set_typelib->count),
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9490
                          enum_set_typelib, collation.collation);
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9491 9492 9493
    if (field)
      field->init(table);
    return field;
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9494 9495
  case MYSQL_TYPE_SET:
    DBUG_ASSERT(enum_set_typelib);
9496
    field= new Field_set((uchar *) 0, max_length, null_ptr, 0,
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9497
                         Field::NONE, name,
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9498
                         get_set_pack_length(enum_set_typelib->count),
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                         enum_set_typelib, collation.collation);
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9500 9501 9502
    if (field)
      field->init(table);
    return field;
9503 9504
  case MYSQL_TYPE_NULL:
    return make_string_field(table);
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9505 9506
  default:
    break;
9507
  }
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9508
  return tmp_table_field_from_field_type(table, 0);
9509 9510 9511
}


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9512
/**
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  Get full information from Item about enum/set fields to be able to create
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  them later.
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  @param item    Item for information collection
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*/
void Item_type_holder::get_full_info(Item *item)
{
  if (fld_type == MYSQL_TYPE_ENUM ||
      fld_type == MYSQL_TYPE_SET)
  {
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    if (item->type() == Item::SUM_FUNC_ITEM &&
        (((Item_sum*)item)->sum_func() == Item_sum::MAX_FUNC ||
         ((Item_sum*)item)->sum_func() == Item_sum::MIN_FUNC))
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      item = ((Item_sum*)item)->get_arg(0);
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    /*
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      We can have enum/set type after merging only if we have one enum|set
      field (or MIN|MAX(enum|set field)) and number of NULL fields
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    */
    DBUG_ASSERT((enum_set_typelib &&
                 get_real_type(item) == MYSQL_TYPE_NULL) ||
                (!enum_set_typelib &&
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                 item->real_item()->type() == Item::FIELD_ITEM &&
                 (get_real_type(item->real_item()) == MYSQL_TYPE_ENUM ||
                  get_real_type(item->real_item()) == MYSQL_TYPE_SET) &&
                 ((Field_enum*)((Item_field *) item->real_item())->field)->typelib));
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    if (!enum_set_typelib)
    {
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      enum_set_typelib= ((Field_enum*)((Item_field *) item->real_item())->field)->typelib;
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    }
  }
}


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double Item_type_holder::val_real()
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{
  DBUG_ASSERT(0); // should never be called
  return 0.0;
}


longlong Item_type_holder::val_int()
{
  DBUG_ASSERT(0); // should never be called
  return 0;
}

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my_decimal *Item_type_holder::val_decimal(my_decimal *)
{
  DBUG_ASSERT(0); // should never be called
  return 0;
}
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String *Item_type_holder::val_str(String*)
{
  DBUG_ASSERT(0); // should never be called
  return 0;
}

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void Item_result_field::cleanup()
{
  DBUG_ENTER("Item_result_field::cleanup()");
  Item::cleanup();
  result_field= 0;
  DBUG_VOID_RETURN;
}

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/**
  Dummy error processor used by default by Name_resolution_context.
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  @note
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    do nothing
*/

void dummy_error_processor(THD *thd, void *data)
{}

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/**
  Wrapper of hide_view_error call for Name_resolution_context error
  processor.
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  @note
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    hide view underlying tables details in error messages
*/

void view_error_processor(THD *thd, void *data)
{
  ((TABLE_LIST *)data)->hide_view_error(thd);
}

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st_select_lex *Item_ident::get_depended_from() const
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{
  st_select_lex *dep;
  if ((dep= depended_from))
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    for ( ; dep->merged_into; dep= dep->merged_into) ;
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  return dep;
}


table_map Item_ref::used_tables() const		
{
  return get_depended_from() ? OUTER_REF_TABLE_BIT : (*ref)->used_tables(); 
}


void Item_ref::update_used_tables() 
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{
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  if (!get_depended_from())
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    (*ref)->update_used_tables();
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  maybe_null|= (*ref)->maybe_null;
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}

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void Item_direct_view_ref::update_used_tables()
{
  Item_ref::update_used_tables();
  if (view->table && view->table->maybe_null)
    maybe_null= TRUE;
}
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table_map Item_direct_view_ref::used_tables() const
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{
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  return get_depended_from() ?
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         OUTER_REF_TABLE_BIT :
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         ((view->is_merged_derived() || view->merged || !view->table) ?
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          (*ref)->used_tables() :
          view->table->map);
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}

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table_map Item_direct_view_ref::not_null_tables() const
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{
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  return get_depended_from() ?
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         0 :
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         ((view->is_merged_derived() || view->merged || !view->table) ?
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          (*ref)->not_null_tables() :
          view->table->map);
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}
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/*
  we add RAND_TABLE_BIT to prevent moving this item from HAVING to WHERE
*/
table_map Item_ref_null_helper::used_tables() const
{
  return (get_depended_from() ?
          OUTER_REF_TABLE_BIT :
          (*ref)->used_tables() | RAND_TABLE_BIT);
}


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#ifndef DBUG_OFF

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/* Debugger help function */
static char dbug_item_print_buf[256];
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const char *dbug_print_item(Item *item)
{
  char *buf= dbug_item_print_buf;
  String str(buf, sizeof(dbug_item_print_buf), &my_charset_bin);
  str.length(0);
  if (!item)
    return "(Item*)NULL";
  item->print(&str ,QT_ORDINARY);
  if (str.c_ptr() == buf)
    return buf;
  else
    return "Couldn't fit into buffer";
}
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#endif /*DBUG_OFF*/