item_func.cc 119 KB
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/* Copyright (C) 2000-2003 MySQL 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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   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.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* This file defines all numerical functions */

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#include <my_global.h>

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#ifdef USE_PRAGMA_IMPLEMENTATION
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#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
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#include "slave.h"				// for wait_for_master_pos
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#include <m_ctype.h>
#include <hash.h>
#include <time.h>
#include <ft_global.h>

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#include "sp_head.h"
#include "sp_rcontext.h"
#include "sp.h"
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bool check_reserved_words(LEX_STRING *name)
{
  if (!my_strcasecmp(system_charset_info, name->str, "GLOBAL") ||
      !my_strcasecmp(system_charset_info, name->str, "LOCAL") ||
      !my_strcasecmp(system_charset_info, name->str, "SESSION"))
    return TRUE;
  return FALSE;
}


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

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static void my_coll_agg_error(DTCollation &c1,
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			       DTCollation &c2,
			       DTCollation &c3,
			       const char *fname)
{
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  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);
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}

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static void my_coll_agg_error(Item** args, uint count, const char *fname)
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{
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  if (count == 2)
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    my_coll_agg_error(args[0]->collation, args[1]->collation, fname);
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  else if (count == 3)
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    my_coll_agg_error(args[0]->collation,
		      args[1]->collation,
		      args[2]->collation,
		      fname);
  else
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    my_error(ER_CANT_AGGREGATE_NCOLLATIONS, MYF(0), fname);
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}

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bool Item_func::agg_arg_collations(DTCollation &c, Item **av, uint count,
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                                   uint flags)
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{
  uint i;
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  c.set(av[0]->collation);
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  for (i= 1; i < count; i++)
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  {
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    if (c.aggregate(av[i]->collation, flags))
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    {
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      my_coll_agg_error(av, count, func_name());
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      return TRUE;
    }
  }
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  if ((flags & MY_COLL_DISALLOW_NONE) &&
      c.derivation == DERIVATION_NONE)
  {
    my_coll_agg_error(av, count, func_name());
    return TRUE;
  }
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  return FALSE;
}

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bool Item_func::agg_arg_collations_for_comparison(DTCollation &c,
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						  Item **av, uint count,
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                                                  uint flags)
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{
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  return (agg_arg_collations(c, av, count, flags | MY_COLL_DISALLOW_NONE));
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}


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/* return TRUE if item is a constant */

bool
eval_const_cond(COND *cond)
{
  return ((Item_func*) cond)->val_int() ? TRUE : FALSE;
}

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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)
*/

bool Item_func::agg_arg_charsets(DTCollation &coll,
                                 Item **args, uint nargs, uint flags)
{
  Item **arg, **last, *safe_args[2];
  if (agg_arg_collations(coll, args, nargs, flags))
    return TRUE;

  /*
    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];
    safe_args[1]= args[1];
  }

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

    if (!(conv= (*arg)->safe_charset_converter(coll.collation)))
    {
      if (nargs >=2 && nargs <= 3)
      {
        /* restore the original arguments for better error message */
        args[0]= safe_args[0];
        args[1]= safe_args[1];
      }
      my_coll_agg_error(args, nargs, func_name());
      res= TRUE;
      break; // we cannot return here, we need to restore "arena".
    }
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    if ((*arg)->type() == FIELD_ITEM)
      ((Item_field *)(*arg))->no_const_subst= 1;
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    /*
      We do not check conv->fixed, because Item_func_conv_charset which can
      be return by safe_charset_converter can't be fixed at creation, also
      it do not need tables (second argument) for name resolving
    */
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    *arg= conv;
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    conv->fix_fields(thd, 0, arg);
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  }
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  if (arena)
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    thd->restore_backup_item_arena(arena, &backup);
  return res;
}



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void Item_func::set_arguments(List<Item> &list)
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{
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  allowed_arg_cols= 1;
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  arg_count=list.elements;
  if ((args=(Item**) sql_alloc(sizeof(Item*)*arg_count)))
  {
    uint i=0;
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    List_iterator_fast<Item> li(list);
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    Item *item;

    while ((item=li++))
    {
      args[i++]= item;
      with_sum_func|=item->with_sum_func;
    }
  }
  list.empty();					// Fields are used
}

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Item_func::Item_func(List<Item> &list)
  :allowed_arg_cols(1)
{
  set_arguments(list);
}

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Item_func::Item_func(THD *thd, Item_func *item)
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  :Item_result_field(thd, item),
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   allowed_arg_cols(item->allowed_arg_cols),
   arg_count(item->arg_count),
   used_tables_cache(item->used_tables_cache),
   not_null_tables_cache(item->not_null_tables_cache),
   const_item_cache(item->const_item_cache)
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{
  if (arg_count)
  {
    if (arg_count <=2)
      args= tmp_arg;
    else
    {
      if (!(args=(Item**) thd->alloc(sizeof(Item*)*arg_count)))
	return;
    }
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    memcpy((char*) args, (char*) item->args, sizeof(Item*)*arg_count);
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  }
}

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/*
  Resolve references to table column for a function and it's argument

  SYNOPSIS:
  fix_fields()
  thd		Thread object
  tables	List of all open tables involved in the query
  ref		Pointer to where this object is used.  This reference
		is used if we want to replace this object with another
		one (for example in the summary functions).

  DESCRIPTION
    Call fix_fields() for all arguments to the function.  The main intention
    is to allow all Item_field() objects to setup pointers to the table fields.

    Sets as a side effect the following class variables:
      maybe_null	Set if any argument may return NULL
      with_sum_func	Set if any of the arguments contains a sum function
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      used_tables_cache Set to union of the tables used by arguments
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      str_value.charset If this is a string function, set this to the
			character set for the first argument.
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			If any argument is binary, this is set to binary
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   If for any item any of the defaults are wrong, then this can
   be fixed in the fix_length_and_dec() function that is called
   after this one or by writing a specialized fix_fields() for the
   item.

  RETURN VALUES
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  FALSE	ok
  TRUE	Got error.  Stored with my_error().
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*/

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bool
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Item_func::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
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{
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  DBUG_ASSERT(fixed == 0);
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  Item **arg,**arg_end;
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#ifndef EMBEDDED_LIBRARY			// Avoid compiler warning
  char buff[STACK_BUFF_ALLOC];			// Max argument in function
#endif
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  used_tables_cache= not_null_tables_cache= 0;
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  const_item_cache=1;

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  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
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    return TRUE;				// Fatal error if flag is set!
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  if (arg_count)
  {						// Print purify happy
    for (arg=args, arg_end=args+arg_count; arg != arg_end ; arg++)
    {
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      Item *item;
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      /*
	We can't yet set item to *arg as fix_fields may change *arg
	We shouldn't call fix_fields() twice, so check 'fixed' field first
      */
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      if ((!(*arg)->fixed && (*arg)->fix_fields(thd, tables, arg)))
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	return TRUE;				/* purecov: inspected */
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      item= *arg;
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      if (allowed_arg_cols)
      {
        if (item->check_cols(allowed_arg_cols))
          return 1;
      }
      else
      {
        /*  we have to fetch allowed_arg_cols from first argument */
        DBUG_ASSERT(arg == args); // it is first argument
        allowed_arg_cols= item->cols();
        DBUG_ASSERT(allowed_arg_cols); // Can't be 0 any more
      }

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      if (item->maybe_null)
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	maybe_null=1;
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      with_sum_func= with_sum_func || item->with_sum_func;
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      used_tables_cache|=     item->used_tables();
      not_null_tables_cache|= item->not_null_tables();
      const_item_cache&=      item->const_item();
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    }
  }
  fix_length_and_dec();
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  if (thd->net.report_error) // An error inside fix_length_and_dec occured
    return TRUE;
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  fixed= 1;
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  return FALSE;
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}

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bool Item_func::walk (Item_processor processor, byte *argument)
{
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
      if ((*arg)->walk(processor, argument))
	return 1;
    }
  }
  return (this->*processor)(argument);
}
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void Item_func::traverse_cond(Cond_traverser traverser,
                              void *argument, traverse_order order)
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{
  if (arg_count)
  {
    Item **arg,**arg_end;
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    switch (order) {
    case(PREFIX):
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      (*traverser)(this, argument);
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      for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
      {
	(*arg)->traverse_cond(traverser, argument, order);
      }
      break;
    case (POSTFIX):
      for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
      {
	(*arg)->traverse_cond(traverser, argument, order);
      }
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      (*traverser)(this, argument);
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    }
  }
}

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/*
  Transform an Item_func object with a transformer callback function
   
  SYNOPSIS
    transform()
    transformer   the transformer callback function to be applied to the nodes
                  of the tree of the object
    argument      parameter to be passed to the transformer
  
  DESCRIPTION
    The function recursively applies the transform method with the
    same transformer to each argument the function.
    If the call of the method for a member item returns a new item
    the old item is substituted for a new one.
    After this the transform method is applied to the root node
    of the Item_func object. 
     
  RETURN VALUES
    Item returned as the result of transformation of the root node 
*/

Item *Item_func::transform(Item_transformer transformer, byte *argument)
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{
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
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      Item *new_item= (*arg)->transform(transformer, argument);
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      if (!new_item)
	return 0;
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      if (*arg != new_item)
        current_thd->change_item_tree(arg, new_item);
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    }
  }
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  return (this->*transformer)(argument);
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}


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/* See comments in Item_cmp_func::split_sum_func() */

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void Item_func::split_sum_func(THD *thd, Item **ref_pointer_array,
                               List<Item> &fields)
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{
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  Item **arg, **arg_end;
  for (arg= args, arg_end= args+arg_count; arg != arg_end ; arg++)
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    (*arg)->split_sum_func2(thd, ref_pointer_array, fields, arg);
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}


void Item_func::update_used_tables()
{
  used_tables_cache=0;
  const_item_cache=1;
  for (uint i=0 ; i < arg_count ; i++)
  {
    args[i]->update_used_tables();
    used_tables_cache|=args[i]->used_tables();
    const_item_cache&=args[i]->const_item();
  }
}


table_map Item_func::used_tables() const
{
  return used_tables_cache;
}

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table_map Item_func::not_null_tables() const
{
  return not_null_tables_cache;
}


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void Item_func::print(String *str)
{
  str->append(func_name());
  str->append('(');
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  print_args(str, 0);
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  str->append(')');
}


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void Item_func::print_args(String *str, uint from)
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{
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  for (uint i=from ; i < arg_count ; i++)
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  {
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    if (i != from)
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      str->append(',');
    args[i]->print(str);
  }
}


void Item_func::print_op(String *str)
{
  str->append('(');
  for (uint i=0 ; i < arg_count-1 ; i++)
  {
    args[i]->print(str);
    str->append(' ');
    str->append(func_name());
    str->append(' ');
  }
  args[arg_count-1]->print(str);
  str->append(')');
}

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bool Item_func::eq(const Item *item, bool binary_cmp) const
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{
  /* Assume we don't have rtti */
  if (this == item)
    return 1;
  if (item->type() != FUNC_ITEM)
    return 0;
  Item_func *item_func=(Item_func*) item;
  if (arg_count != item_func->arg_count ||
      func_name() != item_func->func_name())
    return 0;
  for (uint i=0; i < arg_count ; i++)
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    if (!args[i]->eq(item_func->args[i], binary_cmp))
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      return 0;
  return 1;
}

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Field *Item_func::tmp_table_field(TABLE *t_arg)
{
  Field *res;
  LINT_INIT(res);

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  switch (result_type()) {
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  case INT_RESULT:
    if (max_length > 11)
      res= new Field_longlong(max_length, maybe_null, name, t_arg,
			      unsigned_flag);
    else
      res= new Field_long(max_length, maybe_null, name, t_arg,
			  unsigned_flag);
    break;
  case REAL_RESULT:
    res= new Field_double(max_length, maybe_null, name, t_arg, decimals);
    break;
  case STRING_RESULT:
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    res= make_string_field(t_arg);
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    break;
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  case DECIMAL_RESULT:
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    res= new Field_new_decimal(my_decimal_precision_to_length(decimal_precision(),
                                                              decimals,
                                                              unsigned_flag),
                               maybe_null, name, t_arg, decimals, unsigned_flag);
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    break;
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  case ROW_RESULT:
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  default:
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    // This case should never be chosen
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    DBUG_ASSERT(0);
    break;
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  }
  return res;
}

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my_decimal *Item_func::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed);
  int2my_decimal(E_DEC_FATAL_ERROR, val_int(), unsigned_flag, decimal_value);
  return decimal_value;
}

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String *Item_real_func::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  double nr= val_real();
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  if (null_value)
    return 0; /* purecov: inspected */
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  str->set(nr,decimals, &my_charset_bin);
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  return str;
}


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void Item_func::fix_num_length_and_dec()
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{
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  decimals= 0;
  for (uint i=0 ; i < arg_count ; i++)
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  {
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    set_if_bigger(decimals, args[i]->decimals);
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  }
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  max_length= float_length(decimals);
}


void Item_func_numhybrid::fix_num_length_and_dec()
{}


/*
  Set max_length/decimals of function if function is fixed point and
  result length/precision depends on argument ones

  SYNOPSIS
    Item_func::count_decimal_length()
*/

void Item_func::count_decimal_length()
{
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  int max_int_part= 0;
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  decimals= 0;
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  unsigned_flag= 1;
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  for (uint i=0 ; i < arg_count ; i++)
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  {
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    set_if_bigger(decimals, args[i]->decimals);
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    set_if_bigger(max_int_part, args[i]->decimal_int_part());
    set_if_smaller(unsigned_flag, args[i]->unsigned_flag);
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  }
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  int precision= min(max_int_part + decimals, DECIMAL_MAX_PRECISION);
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
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}


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/*
  Set max_length of if it is maximum length of its arguments

  SYNOPSIS
    Item_func::count_only_length()
*/

void Item_func::count_only_length()
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{
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  max_length= 0;
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  unsigned_flag= 0;
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  for (uint i=0 ; i < arg_count ; i++)
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  {
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    set_if_bigger(max_length, args[i]->max_length);
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    set_if_bigger(unsigned_flag, args[i]->unsigned_flag);
  }
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}

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/*
  Set max_length/decimals of function if function is floating point and
  result length/precision depends on argument ones

  SYNOPSIS
    Item_func::count_real_length()
*/

void Item_func::count_real_length()
{
  uint32 length= 0;
  decimals= 0;
  max_length= 0;
  for (uint i=0 ; i < arg_count ; i++)
  {
    if (decimals != NOT_FIXED_DEC)
    {
      set_if_bigger(decimals, args[i]->decimals);
      set_if_bigger(length, (args[i]->max_length - args[i]->decimals));
    }
    set_if_bigger(max_length, args[i]->max_length);
  }
  if (decimals != NOT_FIXED_DEC)
  {
    max_length= length;
    length+= decimals;
    if (length < max_length)  // If previous operation gave overflow
      max_length= UINT_MAX32;
    else
      max_length= length;
  }
}



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void Item_func::signal_divide_by_null()
{
  THD *thd= current_thd;
  if (thd->variables.sql_mode & MODE_ERROR_FOR_DIVISION_BY_ZERO)
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_DIVISION_BY_ZERO,
                 ER(ER_DIVISION_BY_ZERO));
  null_value= 1;
}


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Item *Item_func::get_tmp_table_item(THD *thd)
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{
  if (!with_sum_func && !const_item())
    return new Item_field(result_field);
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  return copy_or_same(thd);
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}

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String *Item_int_func::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  longlong nr=val_int();
  if (null_value)
    return 0;
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  if (!unsigned_flag)
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    str->set(nr,&my_charset_bin);
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  else
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    str->set((ulonglong) nr,&my_charset_bin);
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  return str;
}

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/*
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  Check arguments here to determine result's type for a numeric
  function of two arguments.
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  SYNOPSIS
    Item_num_op::find_num_type()
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*/
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void Item_num_op::find_num_type(void)
{
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  DBUG_ENTER("Item_num_op::find_num_type");
  DBUG_PRINT("info", ("name %s", func_name()));
  DBUG_ASSERT(arg_count == 2);
  Item_result r0= args[0]->result_type();
  Item_result r1= args[1]->result_type();

  if (r0 == REAL_RESULT || r1 == REAL_RESULT ||
      r0 == STRING_RESULT || r1 ==STRING_RESULT)
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  {
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    count_real_length();
    max_length= float_length(decimals);
    hybrid_type= REAL_RESULT;
  }
  else if (r0 == DECIMAL_RESULT || r1 == DECIMAL_RESULT)
  {
    hybrid_type= DECIMAL_RESULT;
    result_precision();
  }
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  else
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  {
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    DBUG_ASSERT(r0 == INT_RESULT && r1 == INT_RESULT);
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    decimals= 0;
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    hybrid_type=INT_RESULT;
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    result_precision();
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  }
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  DBUG_PRINT("info", ("Type: %s",
             (hybrid_type == REAL_RESULT ? "REAL_RESULT" :
              hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
              hybrid_type == INT_RESULT ? "INT_RESULT" :
              "--ILLEGAL!!!--")));
  DBUG_VOID_RETURN;
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}

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/*
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  Set result type for a numeric function of one argument
  (can be also used by a numeric function of many arguments, if the result
  type depends only on the first argument)
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  SYNOPSIS
    Item_func_num1::find_num_type()
*/
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void Item_func_num1::find_num_type()
{
  DBUG_ENTER("Item_func_num1::find_num_type");
  DBUG_PRINT("info", ("name %s", func_name()));
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  switch (hybrid_type= args[0]->result_type()) {
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  case INT_RESULT:
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    unsigned_flag= args[0]->unsigned_flag;
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    break;
  case STRING_RESULT:
  case REAL_RESULT:
    hybrid_type= REAL_RESULT;
    max_length= float_length(decimals);
    break;
  case DECIMAL_RESULT:
    break;
  default:
    DBUG_ASSERT(0);
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  }
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  DBUG_PRINT("info", ("Type: %s",
                      (hybrid_type == REAL_RESULT ? "REAL_RESULT" :
                       hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
                       hybrid_type == INT_RESULT ? "INT_RESULT" :
                       "--ILLEGAL!!!--")));
  DBUG_VOID_RETURN;
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}

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void Item_func_num1::fix_num_length_and_dec()
{
  decimals= args[0]->decimals;
  max_length= args[0]->max_length;
}


void Item_func_numhybrid::fix_length_and_dec()
{
  fix_num_length_and_dec();
  find_num_type();
}


String *Item_func_numhybrid::val_str(String *str)
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{
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  DBUG_ASSERT(fixed == 1);
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  switch (hybrid_type) {
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  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    if (!(val= decimal_op(&decimal_value)))
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      return 0;                                 // null is set
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    my_decimal_round(E_DEC_FATAL_ERROR, val, decimals, FALSE, val);
    my_decimal2string(E_DEC_FATAL_ERROR, val, 0, 0, 0, str);
    break;
  }
  case INT_RESULT:
  {
    longlong nr= int_op();
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    if (null_value)
      return 0; /* purecov: inspected */
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    if (!unsigned_flag)
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      str->set(nr,&my_charset_bin);
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    else
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      str->set((ulonglong) nr,&my_charset_bin);
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    break;
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  }
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  case REAL_RESULT:
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  {
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    double nr= real_op();
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    if (null_value)
      return 0; /* purecov: inspected */
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    str->set(nr,decimals,&my_charset_bin);
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    break;
  }
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  case STRING_RESULT:
    return str_op(&str_value);
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  default:
    DBUG_ASSERT(0);
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  }
  return str;
}


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double Item_func_numhybrid::val_real()
{
  DBUG_ASSERT(fixed == 1);
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  switch (hybrid_type) {
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  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    double result;
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    if (!(val= decimal_op(&decimal_value)))
      return 0.0;                               // null is set
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    my_decimal2double(E_DEC_FATAL_ERROR, val, &result);
    return result;
  }
  case INT_RESULT:
    return (double)int_op();
  case REAL_RESULT:
    return real_op();
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  case STRING_RESULT:
  {
    char *end_not_used;
    int err_not_used;
    String *res= str_op(&str_value);
    return (res ? my_strntod(res->charset(), (char*) res->ptr(), res->length(),
			     &end_not_used, &err_not_used) : 0.0);
  }
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  default:
    DBUG_ASSERT(0);
  }
  return 0.0;
}


longlong Item_func_numhybrid::val_int()
{
  DBUG_ASSERT(fixed == 1);
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  switch (hybrid_type) {
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  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    if (!(val= decimal_op(&decimal_value)))
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      return 0;                                 // null is set
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    longlong result;
    my_decimal2int(E_DEC_FATAL_ERROR, val, unsigned_flag, &result);
    return result;
  }
  case INT_RESULT:
    return int_op();
  case REAL_RESULT:
    return (longlong)real_op();
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  case STRING_RESULT:
  {
    char *end_not_used;
    int err_not_used;
    String *res= str_op(&str_value);
    CHARSET_INFO *cs= str_value.charset();
    return (res ? (*(cs->cset->strtoll10))(cs, res->ptr(), &end_not_used,
                                           &err_not_used) : 0);
  }
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  default:
    DBUG_ASSERT(0);
  }
  return 0;
}


my_decimal *Item_func_numhybrid::val_decimal(my_decimal *decimal_value)
{
  my_decimal *val= decimal_value;
  DBUG_ASSERT(fixed == 1);
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  switch (hybrid_type) {
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  case DECIMAL_RESULT:
    val= decimal_op(decimal_value);
    break;
  case INT_RESULT:
  {
    longlong result= int_op();
    int2my_decimal(E_DEC_FATAL_ERROR, result, unsigned_flag, decimal_value);
    break;
  }
  case REAL_RESULT:
  {
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    double result= (double)int_op();
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    double2my_decimal(E_DEC_FATAL_ERROR, result, decimal_value);
    break;
  }
  case STRING_RESULT:
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  {
    String *res= str_op(&str_value);
    str2my_decimal(E_DEC_FATAL_ERROR, (char*) res->ptr(),
                   res->length(), res->charset(), decimal_value);
    break;
  }  
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  case ROW_RESULT:
  default:
    DBUG_ASSERT(0);
  }
  return val;
}


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void Item_func_signed::print(String *str)
{
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  str->append("cast(", 5);
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  args[0]->print(str);
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  str->append(" as signed)", 11);
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}


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longlong Item_func_signed::val_int_from_str(int *error)
{
  char buff[MAX_FIELD_WIDTH], *end;
  String tmp(buff,sizeof(buff), &my_charset_bin), *res;
  longlong value;

  /*
    For a string result, we must first get the string and then convert it
    to a longlong
  */

  if (!(res= args[0]->val_str(&tmp)))
  {
    null_value= 1;
    *error= 0;
    return 0;
  }
  null_value= 0;
  end= (char*) res->ptr()+ res->length();
  value= my_strtoll10(res->ptr(), &end, error);
  if (*error > 0 || end != res->ptr()+ res->length())
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_TRUNCATED_WRONG_VALUE,
                        ER(ER_TRUNCATED_WRONG_VALUE), "INTEGER",
                        res->c_ptr());
  return value;
}


longlong Item_func_signed::val_int()
{
  longlong value;
  int error;

  if (args[0]->cast_to_int_type() != STRING_RESULT)
  {
    value= args[0]->val_int();
    null_value= args[0]->null_value; 
    return value;
  }

  value= val_int_from_str(&error);
  if (value < 0 && error == 0)
  {
    push_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
                 "Cast to signed converted positive out-of-range integer to "
                 "it's negative complement");
  }
  return value;
}


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void Item_func_unsigned::print(String *str)
{
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  str->append("cast(", 5);
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  args[0]->print(str);
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  str->append(" as unsigned)", 13);
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}


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longlong Item_func_unsigned::val_int()
{
  longlong value;
  int error;

  if (args[0]->cast_to_int_type() != STRING_RESULT)
  {
    value= args[0]->val_int();
    null_value= args[0]->null_value; 
    return value;
  }

  value= val_int_from_str(&error);
  if (error < 0)
    push_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
                 "Cast to unsigned converted negative integer to it's "
                 "positive complement");
  return value;
}


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String *Item_decimal_typecast::val_str(String *str)
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
  my_decimal_round(E_DEC_FATAL_ERROR, tmp, decimals, FALSE, &tmp_buf);
  my_decimal2string(E_DEC_FATAL_ERROR, &tmp_buf, 0, 0, 0, str);
  return str;
}


double Item_decimal_typecast::val_real()
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
  double res;
  my_decimal2double(E_DEC_FATAL_ERROR, tmp, &res);
  return res;
}


longlong Item_decimal_typecast::val_int()
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
  longlong res;
  my_decimal2int(E_DEC_FATAL_ERROR, tmp, unsigned_flag, &res);
  return res;
}


my_decimal *Item_decimal_typecast::val_decimal(my_decimal *dec)
{
  my_decimal tmp_buf, *tmp= args[0]->val_decimal(&tmp_buf);
  my_decimal_round(E_DEC_FATAL_ERROR, tmp, decimals, FALSE, dec);
  return dec;
}


double Item_func_plus::real_op()
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{
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  double value= args[0]->val_real() + args[1]->val_real();
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  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0;
  return value;
}

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longlong Item_func_plus::int_op()
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{
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  longlong value=args[0]->val_int()+args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
}


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/*
  Calculate plus of two decimail's

  SYNOPSIS
    decimal_op()
    decimal_value	Buffer that can be used to store result

  RETURN
   0	Value was NULL;  In this case null_value is set
   #	Value of operation as a decimal
*/

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my_decimal *Item_func_plus::decimal_op(my_decimal *decimal_value)
{
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  my_decimal value1, *val1;
  my_decimal value2, *val2;
  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if (!(null_value= (args[1]->null_value ||
                     my_decimal_add(E_DEC_FATAL_ERROR, decimal_value, val1,
                                    val2) > 1)))
    return decimal_value;
  return 0;
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}

/*
  Set precision of results for additive operations (+ and -)

  SYNOPSIS
    Item_func_additive_op::result_precision()
*/
void Item_func_additive_op::result_precision()
{
  decimals= max(args[0]->decimals, args[1]->decimals);
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  int max_int_part= max(args[0]->decimal_precision() - args[0]->decimals,
                        args[1]->decimal_precision() - args[1]->decimals);
  int precision= min(max_int_part + 1 + decimals, DECIMAL_MAX_PRECISION);

  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
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}

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/*
  The following function is here to allow the user to force
  subtraction of UNSIGNED BIGINT to return negative values.
*/

void Item_func_minus::fix_length_and_dec()
{
  Item_num_op::fix_length_and_dec();
  if (unsigned_flag &&
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      (current_thd->variables.sql_mode & MODE_NO_UNSIGNED_SUBTRACTION))
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    unsigned_flag=0;
}


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double Item_func_minus::real_op()
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{
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  double value= args[0]->val_real() - args[1]->val_real();
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  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0;
  return value;
}

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longlong Item_func_minus::int_op()
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{
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  longlong value=args[0]->val_int() - args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
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}

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/* See Item_func_plus::decimal_op for comments */

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my_decimal *Item_func_minus::decimal_op(my_decimal *decimal_value)
{
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  my_decimal value1, *val1;
  my_decimal value2, *val2= 

  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if (!(null_value= (args[1]->null_value ||
                     my_decimal_sub(E_DEC_FATAL_ERROR, decimal_value, val1,
                                    val2) > 1)))
    return decimal_value;
  return 0;
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}

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double Item_func_mul::real_op()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real() * args[1]->val_real();
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  if ((null_value=args[0]->null_value || args[1]->null_value))
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    return 0.0;
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  return value;
}

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longlong Item_func_mul::int_op()
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{
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  DBUG_ASSERT(fixed == 1);
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  longlong value=args[0]->val_int()*args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
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}


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/* See Item_func_plus::decimal_op for comments */

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my_decimal *Item_func_mul::decimal_op(my_decimal *decimal_value)
{
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  my_decimal value1, *val1;
  my_decimal value2, *val2;
  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if (!(null_value= (args[1]->null_value ||
                     my_decimal_mul(E_DEC_FATAL_ERROR, decimal_value, val1,
                                    val2) > 1)))
    return decimal_value;
  return 0;
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}


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void Item_func_mul::result_precision()
{
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  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  decimals= min(args[0]->decimals + args[1]->decimals, DECIMAL_MAX_SCALE);
  int precision= min(args[0]->decimal_precision() + args[1]->decimal_precision(),
                     DECIMAL_MAX_PRECISION);
  max_length= my_decimal_precision_to_length(precision, decimals,unsigned_flag);
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}


double Item_func_div::real_op()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
  double val2= args[1]->val_real();
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  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0.0;
  if (val2 == 0.0)
  {
    signal_divide_by_null();
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    return 0.0;
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  }
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  return value/val2;
}

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my_decimal *Item_func_div::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal value1, *val1;
  my_decimal value2, *val2;

  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if ((null_value= args[1]->null_value))
    return 0;
  switch (my_decimal_div(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
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                         val1, val2, prec_increment)) {
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  case E_DEC_TRUNCATED:
  case E_DEC_OK:
    return decimal_value;
  case E_DEC_DIV_ZERO:
    signal_divide_by_null();
  default:
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    null_value= 1;                              // Safety
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    return 0;
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  }
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}


void Item_func_div::result_precision()
{
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  uint precision=min(args[0]->decimal_precision() + prec_increment,
                     DECIMAL_MAX_PRECISION);
  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  decimals= min(args[0]->decimals + prec_increment, DECIMAL_MAX_SCALE);
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
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}

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void Item_func_div::fix_length_and_dec()
{
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  DBUG_ENTER("Item_func_div::fix_length_and_dec");
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  prec_increment= current_thd->variables.div_precincrement;
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  Item_num_op::fix_length_and_dec();
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  switch(hybrid_type) {
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  case REAL_RESULT:
  {
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    decimals=max(args[0]->decimals,args[1]->decimals)+prec_increment;
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    set_if_smaller(decimals, NOT_FIXED_DEC);
    max_length=args[0]->max_length - args[0]->decimals + decimals;
    uint tmp=float_length(decimals);
    set_if_smaller(max_length,tmp);
    break;
  }
  case INT_RESULT:
    hybrid_type= DECIMAL_RESULT;
    DBUG_PRINT("info", ("Type changed: DECIMAL_RESULT"));
    result_precision();
    break;
  case DECIMAL_RESULT:
    result_precision();
    break;
  default:
    DBUG_ASSERT(0);
  }
  maybe_null= 1; // devision by zero
  DBUG_VOID_RETURN;
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}

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/* Integer division */
longlong Item_func_int_div::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  longlong value=args[0]->val_int();
  longlong val2=args[1]->val_int();
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  if ((null_value= (args[0]->null_value || args[1]->null_value)))
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    return 0;
  if (val2 == 0)
  {
    signal_divide_by_null();
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    return 0;
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  }
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  return (unsigned_flag ?
	  (ulonglong) value / (ulonglong) val2 :
	  value / val2);
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}


void Item_func_int_div::fix_length_and_dec()
{
  max_length=args[0]->max_length - args[0]->decimals;
  maybe_null=1;
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  unsigned_flag=args[0]->unsigned_flag | args[1]->unsigned_flag;
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}


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longlong Item_func_mod::int_op()
{
  DBUG_ASSERT(fixed == 1);
  longlong value=  args[0]->val_int();
  longlong val2= args[1]->val_int();
  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0; /* purecov: inspected */
  if (val2 == 0)
  {
    signal_divide_by_null();
    return 0;
  }
  return value % val2;
}

double Item_func_mod::real_op()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
  double val2=  args[1]->val_real();
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  if ((null_value= args[0]->null_value || args[1]->null_value))
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    return 0.0; /* purecov: inspected */
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  if (val2 == 0.0)
  {
    signal_divide_by_null();
    return 0.0;
  }
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  return fmod(value,val2);
}

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my_decimal *Item_func_mod::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal value1, *val1;
  my_decimal value2, *val2;

  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if ((null_value= args[1]->null_value))
    return 0;
  switch (my_decimal_mod(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
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                         val1, val2)) {
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  case E_DEC_TRUNCATED:
  case E_DEC_OK:
    return decimal_value;
  case E_DEC_DIV_ZERO:
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    signal_divide_by_null();
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  default:
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    null_value= 1;
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    return 0;
  }
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}

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void Item_func_mod::result_precision()
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{
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  decimals= max(args[0]->decimals, args[1]->decimals);
  max_length= max(args[0]->max_length, args[1]->max_length);
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}


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double Item_func_neg::real_op()
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{
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  double value= args[0]->val_real();
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  null_value= args[0]->null_value;
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  return -value;
}

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longlong Item_func_neg::int_op()
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{
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  longlong value= args[0]->val_int();
  null_value= args[0]->null_value;
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  return -value;
}

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my_decimal *Item_func_neg::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal val, *value= args[0]->val_decimal(&val);
  if (!(null_value= args[0]->null_value))
  {
    my_decimal2decimal(value, decimal_value);
    my_decimal_neg(decimal_value);
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    return decimal_value;
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  }
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  return 0;
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}

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void Item_func_neg::fix_num_length_and_dec()
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{
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  decimals= args[0]->decimals;
  /* 1 add because sign can appear */
  max_length= args[0]->max_length + 1;
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}

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void Item_func_neg::fix_length_and_dec()
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{
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  DBUG_ENTER("Item_func_neg::fix_length_and_dec");
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  Item_func_num1::fix_length_and_dec();
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  /*
    If this is in integer context keep the context as integer if possible
    (This is how multiplication and other integer functions works)
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    Use val() to get value as arg_type doesn't mean that item is
    Item_int or Item_real due to existence of Item_param.
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  */
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  if (hybrid_type == INT_RESULT &&
      args[0]->type() == INT_ITEM &&
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      ((ulonglong) args[0]->val_int() >= (ulonglong) LONGLONG_MIN))
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  {
    /*
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      Ensure that result is converted to DECIMAL, as longlong can't hold
      the negated number
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    */
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    hybrid_type= DECIMAL_RESULT;
    DBUG_PRINT("info", ("Type changed: DECIMAL_RESULT"));
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  }
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  unsigned_flag= 0;
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  DBUG_VOID_RETURN;
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}

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double Item_func_abs::real_op()
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{
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  double value= args[0]->val_real();
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  null_value= args[0]->null_value;
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  return fabs(value);
}

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longlong Item_func_abs::int_op()
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{
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  longlong value= args[0]->val_int();
  null_value= args[0]->null_value;
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  return value >= 0 ? value : -value;
}

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my_decimal *Item_func_abs::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal val, *value= args[0]->val_decimal(&val);
  if (!(null_value= args[0]->null_value))
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  {
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    my_decimal2decimal(value, decimal_value);
    if (decimal_value->sign())
      my_decimal_neg(decimal_value);
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    return decimal_value;
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  }
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  return 0;
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}


void Item_func_abs::fix_length_and_dec()
{
  Item_func_num1::fix_length_and_dec();
  if (hybrid_type == INT_RESULT)
    unsigned_flag= 1;
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}

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/* Gateway to natural LOG function */
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double Item_func_ln::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || value <= 0.0)))
    return 0.0;
  return log(value);
}

/* 
 Extended but so slower LOG function
 We have to check if all values are > zero and first one is not one
 as these are the cases then result is not a number.
*/ 
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double Item_func_log::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || value <= 0.0)))
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    return 0.0;
  if (arg_count == 2)
  {
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    double value2= args[1]->val_real();
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    if ((null_value=(args[1]->null_value || value2 <= 0.0 || value == 1.0)))
      return 0.0;
    return log(value2) / log(value);
  }
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  return log(value);
}

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double Item_func_log2::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || value <= 0.0)))
    return 0.0;
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  return log(value) / M_LN2;
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}

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double Item_func_log10::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || value <= 0.0)))
    return 0.0; /* purecov: inspected */
  return log10(value);
}

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double Item_func_exp::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0; /* purecov: inspected */
  return exp(value);
}

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double Item_func_sqrt::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || value < 0)))
    return 0.0; /* purecov: inspected */
  return sqrt(value);
}

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double Item_func_pow::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
  double val2= args[1]->val_real();
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  if ((null_value=(args[0]->null_value || args[1]->null_value)))
    return 0.0; /* purecov: inspected */
  return pow(value,val2);
}

// Trigonometric functions

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double Item_func_acos::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  // the volatile's for BUG #2338 to calm optimizer down (because of gcc's bug)
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  volatile double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
    return 0.0;
  return fix_result(acos(value));
}

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double Item_func_asin::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  // the volatile's for BUG #2338 to calm optimizer down (because of gcc's bug)
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  volatile double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
    return 0.0;
  return fix_result(asin(value));
}

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double Item_func_atan::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0;
  if (arg_count == 2)
  {
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    double val2= args[1]->val_real();
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    if ((null_value=args[1]->null_value))
      return 0.0;
    return fix_result(atan2(value,val2));
  }
  return fix_result(atan(value));
}

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double Item_func_cos::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(cos(value));
}

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double Item_func_sin::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(sin(value));
}

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double Item_func_tan::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(tan(value));
}


// Shift-functions, same as << and >> in C/C++


longlong Item_func_shift_left::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  uint shift;
  ulonglong res= ((ulonglong) args[0]->val_int() <<
		  (shift=(uint) args[1]->val_int()));
  if (args[0]->null_value || args[1]->null_value)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (shift < sizeof(longlong)*8 ? (longlong) res : LL(0));
}

longlong Item_func_shift_right::val_int()
{
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  uint shift;
  ulonglong res= (ulonglong) args[0]->val_int() >>
    (shift=(uint) args[1]->val_int());
  if (args[0]->null_value || args[1]->null_value)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (shift < sizeof(longlong)*8 ? (longlong) res : LL(0));
}


longlong Item_func_bit_neg::val_int()
{
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  ulonglong res= (ulonglong) args[0]->val_int();
  if ((null_value=args[0]->null_value))
    return 0;
  return ~res;
}


// Conversion functions

void Item_func_integer::fix_length_and_dec()
{
  max_length=args[0]->max_length - args[0]->decimals+1;
  uint tmp=float_length(decimals);
  set_if_smaller(max_length,tmp);
  decimals=0;
}

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void Item_func_int_val::fix_num_length_and_dec()
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{
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  max_length= args[0]->max_length - (args[0]->decimals ?
                                     args[0]->decimals + 1 :
                                     0) + 2;
  uint tmp= float_length(decimals);
  set_if_smaller(max_length,tmp);
  decimals= 0;
}


void Item_func_int_val::find_num_type()
{
  DBUG_ENTER("Item_func_int_val::find_num_type");
  DBUG_PRINT("info", ("name %s", func_name()));
  switch(hybrid_type= args[0]->result_type())
  {
  case STRING_RESULT:
  case REAL_RESULT:
    hybrid_type= REAL_RESULT;
    max_length= float_length(decimals);
    break;
  case INT_RESULT:
  case DECIMAL_RESULT:
    /*
      -2 because in most high position can't be used any digit for longlong
      and one position for increasing value during operation
    */
    if ((args[0]->max_length - args[0]->decimals) >=
        (DECIMAL_LONGLONG_DIGITS - 2))
    {
      hybrid_type= DECIMAL_RESULT;
    }
    else
    {
      unsigned_flag= args[0]->unsigned_flag;
      hybrid_type= INT_RESULT;
    }
    break;
  default:
    DBUG_ASSERT(0);
  }
  DBUG_PRINT("info", ("Type: %s",
                      (hybrid_type == REAL_RESULT ? "REAL_RESULT" :
                       hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
                       hybrid_type == INT_RESULT ? "INT_RESULT" :
                       "--ILLEGAL!!!--")));

  DBUG_VOID_RETURN;
}


longlong Item_func_ceiling::int_op()
{
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  longlong result;
  switch (args[0]->result_type()) {
  case INT_RESULT:
    result= args[0]->val_int();
    null_value= args[0]->null_value;
    break;
  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec;
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    if ((dec= Item_func_ceiling::decimal_op(&dec_buf)))
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      my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
    else
      result= 0;
    break;
  }
  default:
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    result= (longlong)Item_func_ceiling::real_op();
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  };
  return result;
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}

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double Item_func_ceiling::real_op()
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{
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  /*
    the volatile's for BUG #3051 to calm optimizer down (because of gcc's
    bug)
  */
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  volatile double value= args[0]->val_real();
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  null_value= args[0]->null_value;
  return ceil(value);
}


my_decimal *Item_func_ceiling::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal val, *value= args[0]->val_decimal(&val);
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  if (!(null_value= (args[0]->null_value ||
                     my_decimal_ceiling(E_DEC_FATAL_ERROR, value,
                                        decimal_value) > 1)))
    return decimal_value;
  return 0;
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}


longlong Item_func_floor::int_op()
{
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  longlong result;
  switch (args[0]->result_type()) {
  case INT_RESULT:
    result= args[0]->val_int();
    null_value= args[0]->null_value;
    break;
  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec;
    if ((dec= Item_func_floor::decimal_op(&dec_buf)))
      my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
    else
      result= 0;
    break;
  }
  default:
    result= (longlong)Item_func_floor::real_op();
  };
  return result;
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}

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double Item_func_floor::real_op()
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{
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  /*
    the volatile's for BUG #3051 to calm optimizer down (because of gcc's
    bug)
  */
  volatile double value= args[0]->val_real();
  null_value= args[0]->null_value;
  return floor(value);
}


my_decimal *Item_func_floor::decimal_op(my_decimal *decimal_value)
{
  my_decimal val, *value= args[0]->val_decimal(&val);
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  if (!(null_value= (args[0]->null_value ||
                     my_decimal_floor(E_DEC_FATAL_ERROR, value,
                                      decimal_value) > 1)))
    return decimal_value;
  return 0;
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}


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void Item_func_round::fix_length_and_dec()
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{
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  unsigned_flag= args[0]->unsigned_flag;
  if (!args[1]->const_item())
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  {
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    max_length= args[0]->max_length;
    decimals= args[0]->decimals;
    hybrid_type= REAL_RESULT;
    return;
  }
  
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  int decimals_to_set= max((int)args[1]->val_int(), 0);
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  if (args[0]->decimals == NOT_FIXED_DEC)
  {
    max_length= args[0]->max_length;
    decimals= min(decimals_to_set, NOT_FIXED_DEC);
    hybrid_type= REAL_RESULT;
    return;
  }
  
  switch (args[0]->result_type())
  {
  case REAL_RESULT:
  case STRING_RESULT:
    hybrid_type= REAL_RESULT;
    decimals= min(decimals_to_set, NOT_FIXED_DEC);
    max_length= float_length(decimals);
    break;
  case INT_RESULT:
    if (truncate || (args[0]->decimal_precision() < DECIMAL_LONGLONG_DIGITS))
    {
      /* Here we can keep INT_RESULT */
      hybrid_type= INT_RESULT;
      int length_can_increase= !truncate && (args[1]->val_int() < 0);
      max_length= args[0]->max_length + length_can_increase;
      decimals= 0;
      break;
    }
  case DECIMAL_RESULT:
  {
    hybrid_type= DECIMAL_RESULT;
    int decimals_delta= args[0]->decimals - decimals_to_set;
    int precision= args[0]->decimal_precision();
    if (decimals_delta > 0)
    {
      int length_increase= truncate ? 0:1;
      precision-= decimals_delta - length_increase;
      decimals= decimals_to_set;
    }
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    else
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      /* Decimals to set is bigger that the original scale */
      /* we keep original decimals value                   */
      decimals= args[0]->decimals;
    max_length= my_decimal_precision_to_length(precision, decimals,
                                              unsigned_flag);
    break;
  }
  default:
    DBUG_ASSERT(0); /* This result type isn't handled */
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  }
}

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double my_double_round(double value, int dec, bool truncate)
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{
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  double tmp;
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  uint abs_dec= abs(dec);
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  /*
    tmp2 is here to avoid return the value with 80 bit precision
    This will fix that the test round(0.1,1) = round(0.1,1) is true
  */
  volatile double tmp2;
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  tmp=(abs_dec < array_elements(log_10) ?
       log_10[abs_dec] : pow(10.0,(double) abs_dec));
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  if (truncate)
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  {
    if (value >= 0)
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      tmp2= dec < 0 ? floor(value/tmp)*tmp : floor(value*tmp)/tmp;
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    else
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      tmp2= dec < 0 ? ceil(value/tmp)*tmp : ceil(value*tmp)/tmp;
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  }
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  else
    tmp2=dec < 0 ? rint(value/tmp)*tmp : rint(value*tmp)/tmp;
  return tmp2;
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}


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double Item_func_round::real_op()
{
  double value= args[0]->val_real();
  int dec= (int) args[1]->val_int();

  if (!(null_value= args[0]->null_value || args[1]->null_value))
    return my_double_round(value, dec, truncate);

  return 0.0;
}


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longlong Item_func_round::int_op()
{
  longlong value= args[0]->val_int();
  int dec=(int) args[1]->val_int();
  decimals= 0;
  uint abs_dec;
  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0;
  if (dec >= 0)
    return value; // integer have not digits after point

  abs_dec= -dec;
  double tmp;
  /*
    tmp2 is here to avoid return the value with 80 bit precision
    This will fix that the test round(0.1,1) = round(0.1,1) is true
  */
  volatile double tmp2;

  tmp= (abs_dec < array_elements(log_10) ?
        log_10[abs_dec] : pow(10.0, (double) abs_dec));

  if (truncate)
  {
    if (unsigned_flag)
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      tmp2= floor(ulonglong2double(value)/tmp)*tmp;
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    else if (value >= 0)
      tmp2= floor(((double)value)/tmp)*tmp;
    else
      tmp2= ceil(((double)value)/tmp)*tmp;
  }
  else
    tmp2= rint(((double)value)/tmp)*tmp;
  return (longlong)tmp2;
}


my_decimal *Item_func_round::decimal_op(my_decimal *decimal_value)
{
  my_decimal val, *value= args[0]->val_decimal(&val);
  int dec=(int) args[1]->val_int();
  if (dec > 0)
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  {
    decimals= min(dec, DECIMAL_MAX_SCALE); // to get correct output
  }
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  if (!(null_value= (args[0]->null_value || args[1]->null_value ||
                     my_decimal_round(E_DEC_FATAL_ERROR, value, dec, truncate,
                                      decimal_value) > 1)))
    return decimal_value;
  return 0;
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}


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bool Item_func_rand::fix_fields(THD *thd, struct st_table_list *tables,
                                Item **ref)
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{
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  if (Item_real_func::fix_fields(thd, tables, ref))
    return TRUE;
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  used_tables_cache|= RAND_TABLE_BIT;
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  if (arg_count)
  {					// Only use argument once in query
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    /*
      Allocate rand structure once: we must use thd->current_arena
      to create rand in proper mem_root if it's a prepared statement or
      stored procedure.
    */
    if (!rand && !(rand= (struct rand_struct*)
                   thd->current_arena->alloc(sizeof(*rand))))
      return TRUE;
    /*
      PARAM_ITEM is returned if we're in statement prepare and consequently
      no placeholder value is set yet.
    */
    if (args[0]->type() != PARAM_ITEM)
    {
      /*
        TODO: do not do reinit 'rand' for every execute of PS/SP if
        args[0] is a constant.
      */
      uint32 tmp= (uint32) args[0]->val_int();
      randominit(rand, (uint32) (tmp*0x10001L+55555555L),
                 (uint32) (tmp*0x10000001L));
    }
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  }
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  else
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  {
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    /*
      No need to send a Rand log event if seed was given eg: RAND(seed),
      as it will be replicated in the query as such.
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      Save the seed only the first time RAND() is used in the query
      Once events are forwarded rather than recreated,
      the following can be skipped if inside the slave thread
    */
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    thd->rand_used=1;
    thd->rand_saved_seed1=thd->rand.seed1;
    thd->rand_saved_seed2=thd->rand.seed2;
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    rand= &thd->rand;
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  }
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  return FALSE;
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}

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void Item_func_rand::update_used_tables()
{
  Item_real_func::update_used_tables();
  used_tables_cache|= RAND_TABLE_BIT;
}

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double Item_func_rand::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  return my_rnd(rand);
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}

longlong Item_func_sign::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  null_value=args[0]->null_value;
  return value < 0.0 ? -1 : (value > 0 ? 1 : 0);
}


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double Item_func_units::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0;
  return value*mul+add;
}


void Item_func_min_max::fix_length_and_dec()
{
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  int max_int_part=0;
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  decimals=0;
  max_length=0;
  maybe_null=1;
  cmp_type=args[0]->result_type();
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  for (uint i=0 ; i < arg_count ; i++)
  {
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    set_if_bigger(max_length, args[i]->max_length);
    set_if_bigger(decimals, args[i]->decimals);
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    set_if_bigger(max_int_part, args[i]->decimal_int_part());
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    if (!args[i]->maybe_null)
      maybe_null=0;
    cmp_type=item_cmp_type(cmp_type,args[i]->result_type());
  }
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  if (cmp_type == STRING_RESULT)
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    agg_arg_charsets(collation, args, arg_count, MY_COLL_CMP_CONV);
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  else if ((cmp_type == DECIMAL_RESULT) || (cmp_type == INT_RESULT))
    max_length= my_decimal_precision_to_length(max_int_part+decimals, decimals,
                                            unsigned_flag);
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}


String *Item_func_min_max::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  switch (cmp_type) {
  case INT_RESULT:
  {
    longlong nr=val_int();
    if (null_value)
      return 0;
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    if (!unsigned_flag)
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      str->set(nr,&my_charset_bin);
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    else
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      str->set((ulonglong) nr,&my_charset_bin);
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    return str;
  }
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  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec_val= val_decimal(&dec_buf);
    if (null_value)
      return 0;
    my_decimal2string(E_DEC_FATAL_ERROR, dec_val, 0, 0, 0, str);
    return str;
  }
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  case REAL_RESULT:
  {
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    double nr= val_real();
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    if (null_value)
      return 0; /* purecov: inspected */
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    str->set(nr,decimals,&my_charset_bin);
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    return str;
  }
  case STRING_RESULT:
  {
    String *res;
    LINT_INIT(res);
    null_value=1;
    for (uint i=0; i < arg_count ; i++)
    {
      if (null_value)
      {
	res=args[i]->val_str(str);
	null_value=args[i]->null_value;
      }
      else
      {
	String *res2;
	res2= args[i]->val_str(res == str ? &tmp_value : str);
	if (res2)
	{
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	  int cmp= sortcmp(res,res2,collation.collation);
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	  if ((cmp_sign < 0 ? cmp : -cmp) < 0)
	    res=res2;
	}
      }
    }
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    if (res)					// If !NULL
      res->set_charset(collation.collation);
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    return res;
  }
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  case ROW_RESULT:
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  default:
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    // This case should never be chosen
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    DBUG_ASSERT(0);
    return 0;
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  }
  return 0;					// Keep compiler happy
}


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double Item_func_min_max::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value=0.0;
  null_value=1;
  for (uint i=0; i < arg_count ; i++)
  {
    if (null_value)
    {
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      value= args[i]->val_real();
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      null_value=args[i]->null_value;
    }
    else
    {
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      double tmp= args[i]->val_real();
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      if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
	value=tmp;
    }
  }
  return value;
}


longlong Item_func_min_max::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  longlong value=0;
  null_value=1;
  for (uint i=0; i < arg_count ; i++)
  {
    if (null_value)
    {
      value=args[i]->val_int();
      null_value=args[i]->null_value;
    }
    else
    {
      longlong tmp=args[i]->val_int();
      if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
	value=tmp;
    }
  }
  return value;
}

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my_decimal *Item_func_min_max::val_decimal(my_decimal *dec)
{
  DBUG_ASSERT(fixed == 1);
  my_decimal tmp_buf, *tmp, *res= NULL;
  null_value=1;
  for (uint i=0; i < arg_count ; i++)
  {
    if (null_value)
    {
      res= args[i]->val_decimal(dec);
      null_value= args[i]->null_value;
    }
    else
    {
      tmp= args[i]->val_decimal(&tmp_buf);
      if (args[i]->null_value)
        continue;
      if ((my_decimal_cmp(tmp, res) * cmp_sign) < 0)
      {
        if (tmp == &tmp_buf)
        {
          my_decimal2decimal(tmp, dec);
          res= dec;
        }
        else
          res= tmp;
      }
    }
  }
  return res;
}


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longlong Item_func_length::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
  return (longlong) res->length();
}

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longlong Item_func_char_length::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
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  return (longlong) res->numchars();
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}

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longlong Item_func_coercibility::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  null_value= 0;
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  return (longlong) args[0]->collation.derivation;
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}
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void Item_func_locate::fix_length_and_dec()
{
  maybe_null=0; max_length=11;
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  agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV);
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}

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longlong Item_func_locate::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *a=args[0]->val_str(&value1);
  String *b=args[1]->val_str(&value2);
  if (!a || !b)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
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  uint start=0;
  uint start0=0;
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  my_match_t match;
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  if (arg_count == 3)
  {
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    start0= start =(uint) args[2]->val_int()-1;
    start=a->charpos(start);
    
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    if (start > a->length() || start+b->length() > a->length())
      return 0;
  }
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  if (!b->length())				// Found empty string at start
    return (longlong) (start+1);
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  if (!cmp_collation.collation->coll->instr(cmp_collation.collation,
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                                            a->ptr()+start, a->length()-start,
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                                            b->ptr(), b->length(),
                                            &match, 1))
    return 0;
  return (longlong) match.mblen + start0 + 1;
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}


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void Item_func_locate::print(String *str)
{
  str->append("locate(", 7);
  args[1]->print(str);
  str->append(',');
  args[0]->print(str);
  if (arg_count == 3)
  {
    str->append(',');
    args[2]->print(str);
  }
  str->append(')');
}


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longlong Item_func_field::val_int()
{
2354
  DBUG_ASSERT(fixed == 1);
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  if (cmp_type == STRING_RESULT)
  {
    String *field;
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    if (!(field= args[0]->val_str(&value)))
      return 0;
2361
    for (uint i=1 ; i < arg_count ; i++)
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    {
      String *tmp_value=args[i]->val_str(&tmp);
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      if (tmp_value && !sortcmp(field,tmp_value,cmp_collation.collation))
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        return (longlong) (i);
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    }
  }
  else if (cmp_type == INT_RESULT)
  {
2370
    longlong val= args[0]->val_int();
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    if (args[0]->null_value)
      return 0;
2373
    for (uint i=1; i < arg_count ; i++)
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    {
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      if (!args[i]->is_null() && val == args[i]->val_int())
        return (longlong) (i);
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    }
  }
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  else if (cmp_type == DECIMAL_RESULT)
  {
    my_decimal dec_arg_buf, *dec_arg,
               dec_buf, *dec= args[0]->val_decimal(&dec_buf);
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    if (args[0]->null_value)
      return 0;
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    for (uint i=1; i < arg_count; i++)
    {
      dec_arg= args[i]->val_decimal(&dec_arg_buf);
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      if (!args[i]->is_null() && !my_decimal_cmp(dec_arg, dec))
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        return (longlong) (i);
    }
  }
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  else
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  {
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    double val= args[0]->val_real();
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    if (args[0]->null_value)
      return 0;
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    for (uint i=1; i < arg_count ; i++)
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    {
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      if (!args[i]->is_null() && val == args[i]->val_real())
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        return (longlong) (i);
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    }
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  }
  return 0;
}

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void Item_func_field::fix_length_and_dec()
{
  maybe_null=0; max_length=3;
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  cmp_type= args[0]->result_type();
  for (uint i=1; i < arg_count ; i++)
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    cmp_type= item_cmp_type(cmp_type, args[i]->result_type());
  if (cmp_type == STRING_RESULT)
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    agg_arg_charsets(cmp_collation, args, arg_count, MY_COLL_CMP_CONV);
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}
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longlong Item_func_ascii::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (longlong) (res->length() ? (uchar) (*res)[0] : (uchar) 0);
}

longlong Item_func_ord::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  if (!res->length()) return 0;
#ifdef USE_MB
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  if (use_mb(res->charset()))
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  {
    register const char *str=res->ptr();
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    register uint32 n=0, l=my_ismbchar(res->charset(),str,str+res->length());
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    if (!l)
      return (longlong)((uchar) *str);
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    while (l--)
      n=(n<<8)|(uint32)((uchar) *str++);
    return (longlong) n;
  }
#endif
  return (longlong) ((uchar) (*res)[0]);
}

	/* Search after a string in a string of strings separated by ',' */
	/* Returns number of found type >= 1 or 0 if not found */
	/* This optimizes searching in enums to bit testing! */

void Item_func_find_in_set::fix_length_and_dec()
{
  decimals=0;
  max_length=3;					// 1-999
  if (args[0]->const_item() && args[1]->type() == FIELD_ITEM)
  {
    Field *field= ((Item_field*) args[1])->field;
    if (field->real_type() == FIELD_TYPE_SET)
    {
      String *find=args[0]->val_str(&value);
      if (find)
      {
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	enum_value= find_type(((Field_enum*) field)->typelib,find->ptr(),
			      find->length(), 0);
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	enum_bit=0;
	if (enum_value)
	  enum_bit=LL(1) << (enum_value-1);
      }
    }
  }
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  agg_arg_collations_for_comparison(cmp_collation, args, 2);
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}

static const char separator=',';

longlong Item_func_find_in_set::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  if (enum_value)
  {
    ulonglong tmp=(ulonglong) args[1]->val_int();
    if (!(null_value=args[1]->null_value || args[0]->null_value))
    {
      if (tmp & enum_bit)
	return enum_value;
    }
    return 0L;
  }

  String *find=args[0]->val_str(&value);
  String *buffer=args[1]->val_str(&value2);
  if (!find || !buffer)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;

  int diff;
  if ((diff=buffer->length() - find->length()) >= 0)
  {
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    my_wc_t wc;
    CHARSET_INFO *cs= cmp_collation.collation;
    const char *str_begin= buffer->ptr();
    const char *str_end= buffer->ptr();
    const char *real_end= str_end+buffer->length();
    const uchar *find_str= (const uchar *) find->ptr();
    uint find_str_len= find->length();
    int position= 0;
    while (1)
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    {
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      int symbol_len;
      if ((symbol_len= cs->cset->mb_wc(cs, &wc, (uchar*) str_end, 
                                       (uchar*) real_end)) > 0)
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      {
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        const char *substr_end= str_end + symbol_len;
        bool is_last_item= (substr_end == real_end);
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        bool is_separator= (wc == (my_wc_t) separator);
        if (is_separator || is_last_item)
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        {
          position++;
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          if (is_last_item && !is_separator)
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            str_end= substr_end;
          if (!my_strnncoll(cs, (const uchar *) str_begin,
                            str_end - str_begin,
                            find_str, find_str_len))
            return (longlong) position;
          else
            str_begin= substr_end;
        }
        str_end= substr_end;
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      }
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      else if (str_end - str_begin == 0 &&
               find_str_len == 0 &&
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               wc == (my_wc_t) separator)
        return (longlong) ++position;
      else
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        return LL(0);
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    }
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  }
  return 0;
}

longlong Item_func_bit_count::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  ulonglong value= (ulonglong) args[0]->val_int();
  if (args[0]->null_value)
  {
    null_value=1; /* purecov: inspected */
    return 0; /* purecov: inspected */
  }
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  return (longlong) my_count_bits(value);
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}


/****************************************************************************
** Functions to handle dynamic loadable functions
** Original source by: Alexis Mikhailov <root@medinf.chuvashia.su>
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** Rewritten by monty.
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****************************************************************************/

#ifdef HAVE_DLOPEN

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void udf_handler::cleanup()
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{
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  if (!not_original)
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  {
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    if (initialized)
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    {
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      if (u_d->func_deinit != NULL)
      {
        void (*deinit)(UDF_INIT *) = (void (*)(UDF_INIT*))
        u_d->func_deinit;
        (*deinit)(&initid);
      }
      free_udf(u_d);
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      initialized= FALSE;
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    }
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    if (buffers)				// Because of bug in ecc
      delete [] buffers;
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    buffers= 0;
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  }
}


bool
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udf_handler::fix_fields(THD *thd, TABLE_LIST *tables, Item_result_field *func,
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			uint arg_count, Item **arguments)
{
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#ifndef EMBEDDED_LIBRARY			// Avoid compiler warning
  char buff[STACK_BUFF_ALLOC];			// Max argument in function
#endif
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  DBUG_ENTER("Item_udf_func::fix_fields");

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  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
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    DBUG_RETURN(TRUE);				// Fatal error flag is set!
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  udf_func *tmp_udf=find_udf(u_d->name.str,(uint) u_d->name.length,1);
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  if (!tmp_udf)
  {
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    my_error(ER_CANT_FIND_UDF, MYF(0), u_d->name.str, errno);
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    DBUG_RETURN(TRUE);
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  }
  u_d=tmp_udf;
  args=arguments;

  /* Fix all arguments */
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  func->maybe_null=0;
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  used_tables_cache=0;
  const_item_cache=1;

  if ((f_args.arg_count=arg_count))
  {
    if (!(f_args.arg_type= (Item_result*)
	  sql_alloc(f_args.arg_count*sizeof(Item_result))))

    {
      free_udf(u_d);
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      DBUG_RETURN(TRUE);
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    }
    uint i;
    Item **arg,**arg_end;
    for (i=0, arg=arguments, arg_end=arguments+arg_count;
	 arg != arg_end ;
	 arg++,i++)
    {
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      if (!(*arg)->fixed &&
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          (*arg)->fix_fields(thd, tables, arg))
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	DBUG_RETURN(1);
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      // we can't assign 'item' before, because fix_fields() can change arg
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      Item *item= *arg;
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      if (item->check_cols(1))
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	DBUG_RETURN(TRUE);
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      /*
	TODO: We should think about this. It is not always
	right way just to set an UDF result to return my_charset_bin
	if one argument has binary sorting order.
	The result collation should be calculated according to arguments
	derivations in some cases and should not in other cases.
	Moreover, some arguments can represent a numeric input
	which doesn't effect the result character set and collation.
	There is no a general rule for UDF. Everything depends on
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        the particular user defined function.
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      */
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      if (item->collation.collation->state & MY_CS_BINSORT)
	func->collation.set(&my_charset_bin);
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      if (item->maybe_null)
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	func->maybe_null=1;
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      func->with_sum_func= func->with_sum_func || item->with_sum_func;
      used_tables_cache|=item->used_tables();
      const_item_cache&=item->const_item();
      f_args.arg_type[i]=item->result_type();
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    }
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    //TODO: why all following memory is not allocated with 1 call of sql_alloc?
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    if (!(buffers=new String[arg_count]) ||
	!(f_args.args= (char**) sql_alloc(arg_count * sizeof(char *))) ||
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	!(f_args.lengths= (ulong*) sql_alloc(arg_count * sizeof(long))) ||
	!(f_args.maybe_null= (char*) sql_alloc(arg_count * sizeof(char))) ||
	!(num_buffer= (char*) sql_alloc(arg_count *
					ALIGN_SIZE(sizeof(double)))) ||
	!(f_args.attributes= (char**) sql_alloc(arg_count * sizeof(char *))) ||
	!(f_args.attribute_lengths= (ulong*) sql_alloc(arg_count *
						       sizeof(long))))
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    {
      free_udf(u_d);
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      DBUG_RETURN(TRUE);
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    }
  }
  func->fix_length_and_dec();
  initid.max_length=func->max_length;
  initid.maybe_null=func->maybe_null;
  initid.const_item=const_item_cache;
  initid.decimals=func->decimals;
  initid.ptr=0;

  if (u_d->func_init)
  {
    char *to=num_buffer;
    for (uint i=0; i < arg_count; i++)
    {
      f_args.args[i]=0;
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      f_args.lengths[i]= arguments[i]->max_length;
      f_args.maybe_null[i]= (char) arguments[i]->maybe_null;
      f_args.attributes[i]= arguments[i]->name;
      f_args.attribute_lengths[i]= arguments[i]->name_length;
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      switch(arguments[i]->type()) {
      case Item::STRING_ITEM:			// Constant string !
      {
	String *res=arguments[i]->val_str((String *) 0);
	if (arguments[i]->null_value)
	  continue;
	f_args.args[i]=    (char*) res->ptr();
	break;
      }
      case Item::INT_ITEM:
	*((longlong*) to) = arguments[i]->val_int();
	if (!arguments[i]->null_value)
	{
	  f_args.args[i]=to;
	  to+= ALIGN_SIZE(sizeof(longlong));
	}
	break;
      case Item::REAL_ITEM:
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	*((double*) to)= arguments[i]->val_real();
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	if (!arguments[i]->null_value)
	{
	  f_args.args[i]=to;
	  to+= ALIGN_SIZE(sizeof(double));
	}
	break;
      default:					// Skip these
	break;
      }
    }
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    thd->net.last_error[0]=0;
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    my_bool (*init)(UDF_INIT *, UDF_ARGS *, char *)=
      (my_bool (*)(UDF_INIT *, UDF_ARGS *,  char *))
      u_d->func_init;
    if ((error=(uchar) init(&initid, &f_args, thd->net.last_error)))
    {
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      my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
               u_d->name.str, thd->net.last_error);
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      free_udf(u_d);
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      DBUG_RETURN(TRUE);
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    }
    func->max_length=min(initid.max_length,MAX_BLOB_WIDTH);
    func->maybe_null=initid.maybe_null;
    const_item_cache=initid.const_item;
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    func->decimals=min(initid.decimals,NOT_FIXED_DEC);
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  }
  initialized=1;
  if (error)
  {
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    my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
             u_d->name.str, ER(ER_UNKNOWN_ERROR));
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    DBUG_RETURN(TRUE);
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  }
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  DBUG_RETURN(FALSE);
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}


bool udf_handler::get_arguments()
{
  if (error)
    return 1;					// Got an error earlier
  char *to= num_buffer;
  uint str_count=0;
  for (uint i=0; i < f_args.arg_count; i++)
  {
    f_args.args[i]=0;
    switch (f_args.arg_type[i]) {
    case STRING_RESULT:
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    case DECIMAL_RESULT:
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      {
	String *res=args[i]->val_str(&buffers[str_count++]);
	if (!(args[i]->null_value))
	{
	  f_args.args[i]=    (char*) res->ptr();
	  f_args.lengths[i]= res->length();
	  break;
	}
      }
    case INT_RESULT:
      *((longlong*) to) = args[i]->val_int();
      if (!args[i]->null_value)
      {
	f_args.args[i]=to;
	to+= ALIGN_SIZE(sizeof(longlong));
      }
      break;
    case REAL_RESULT:
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      *((double*) to)= args[i]->val_real();
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      if (!args[i]->null_value)
      {
	f_args.args[i]=to;
	to+= ALIGN_SIZE(sizeof(double));
      }
      break;
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    case ROW_RESULT:
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    default:
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      // This case should never be chosen
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      DBUG_ASSERT(0);
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      break;
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    }
  }
  return 0;
}

/* This returns (String*) 0 in case of NULL values */

String *udf_handler::val_str(String *str,String *save_str)
{
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  uchar is_null_tmp=0;
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  ulong res_length;

  if (get_arguments())
    return 0;
  char * (*func)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *)=
    (char* (*)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *))
    u_d->func;

  if ((res_length=str->alloced_length()) < MAX_FIELD_WIDTH)
  {						// This happens VERY seldom
    if (str->alloc(MAX_FIELD_WIDTH))
    {
      error=1;
      return 0;
    }
  }
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  char *res=func(&initid, &f_args, (char*) str->ptr(), &res_length,
		 &is_null_tmp, &error);
  if (is_null_tmp || !res || error)		// The !res is for safety
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  {
    return 0;
  }
  if (res == str->ptr())
  {
    str->length(res_length);
    return str;
  }
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  save_str->set(res, res_length, str->charset());
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  return save_str;
}


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/*
  For the moment, UDF functions are returning DECIMAL values as strings
*/

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my_decimal *udf_handler::val_decimal(my_bool *null_value, my_decimal *dec_buf)
{
  char buf[DECIMAL_MAX_STR_LENGTH+1], *end;
  ulong res_length= DECIMAL_MAX_STR_LENGTH;

  if (get_arguments())
  {
    *null_value=1;
    return 0;
  }
  char *(*func)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *)=
    (char* (*)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *))
    u_d->func;

  char *res= func(&initid, &f_args, buf, &res_length, &is_null, &error);
  if (is_null || error)
  {
    *null_value= 1;
    return 0;
  }
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  end= res+ res_length;
  str2my_decimal(E_DEC_FATAL_ERROR, res, dec_buf, &end);
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  return dec_buf;
}

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void Item_udf_func::cleanup()
{
  udf.cleanup();
  Item_func::cleanup();
}

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double Item_func_udf_float::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  DBUG_ENTER("Item_func_udf_float::val");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
		     args[0]->result_type(), arg_count));
  DBUG_RETURN(udf.val(&null_value));
}


String *Item_func_udf_float::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  double nr= val_real();
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  if (null_value)
    return 0;					/* purecov: inspected */
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  str->set(nr,decimals,&my_charset_bin);
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  return str;
}


longlong Item_func_udf_int::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  DBUG_ENTER("Item_func_udf_int::val_int");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
		     args[0]->result_type(), arg_count));

  DBUG_RETURN(udf.val_int(&null_value));
}


String *Item_func_udf_int::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  longlong nr=val_int();
  if (null_value)
    return 0;
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  if (!unsigned_flag)
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    str->set(nr,&my_charset_bin);
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  else
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    str->set((ulonglong) nr,&my_charset_bin);
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  return str;
}

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longlong Item_func_udf_decimal::val_int()
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
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  longlong result;
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  if (null_value)
    return 0;
  my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
  return result;
}


double Item_func_udf_decimal::val_real()
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
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  double result;
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  if (null_value)
    return 0.0;
  my_decimal2double(E_DEC_FATAL_ERROR, dec, &result);
  return result;
}


my_decimal *Item_func_udf_decimal::val_decimal(my_decimal *dec_buf)
{
  DBUG_ASSERT(fixed == 1);
  DBUG_ENTER("Item_func_udf_decimal::val_decimal");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
                     args[0]->result_type(), arg_count));

  DBUG_RETURN(udf.val_decimal(&null_value, dec_buf));
}


String *Item_func_udf_decimal::val_str(String *str)
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
  if (null_value)
    return 0;
  if (str->length() < DECIMAL_MAX_STR_LENGTH)
    str->length(DECIMAL_MAX_STR_LENGTH);
  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;
}


void Item_func_udf_decimal::fix_length_and_dec()
{
  fix_num_length_and_dec();
}


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/* Default max_length is max argument length */

void Item_func_udf_str::fix_length_and_dec()
{
  DBUG_ENTER("Item_func_udf_str::fix_length_and_dec");
  max_length=0;
  for (uint i = 0; i < arg_count; i++)
    set_if_bigger(max_length,args[i]->max_length);
  DBUG_VOID_RETURN;
}

String *Item_func_udf_str::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=udf.val_str(str,&str_value);
  null_value = !res;
  return res;
}

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/*
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   This has to come last in the udf_handler methods, or C for AIX
   version 6.0.0.0 fails to compile with debugging enabled. (Yes, really.)
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 */

udf_handler::~udf_handler()
{
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  /* Everything should be properly cleaned up by this moment. */
  DBUG_ASSERT(not_original || !(initialized || buffers));
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}

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#else
bool udf_handler::get_arguments() { return 0; }
#endif /* HAVE_DLOPEN */

/*
** User level locks
*/

pthread_mutex_t LOCK_user_locks;
static HASH hash_user_locks;

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class User_level_lock
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{
  char *key;
  uint key_length;

public:
  int count;
  bool locked;
  pthread_cond_t cond;
  pthread_t thread;
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  ulong thread_id;
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  User_level_lock(const char *key_arg,uint length, ulong id) 
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    :key_length(length),count(1),locked(1), thread_id(id)
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  {
    key=(char*) my_memdup((byte*) key_arg,length,MYF(0));
    pthread_cond_init(&cond,NULL);
    if (key)
    {
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      if (my_hash_insert(&hash_user_locks,(byte*) this))
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      {
	my_free((gptr) key,MYF(0));
	key=0;
      }
    }
  }
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  ~User_level_lock()
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  {
    if (key)
    {
      hash_delete(&hash_user_locks,(byte*) this);
      my_free((gptr) key,MYF(0));
    }
    pthread_cond_destroy(&cond);
  }
  inline bool initialized() { return key != 0; }
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  friend void item_user_lock_release(User_level_lock *ull);
  friend char *ull_get_key(const User_level_lock *ull, uint *length,
                           my_bool not_used);
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};

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char *ull_get_key(const User_level_lock *ull, uint *length,
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		  my_bool not_used __attribute__((unused)))
{
  *length=(uint) ull->key_length;
  return (char*) ull->key;
}

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static bool item_user_lock_inited= 0;

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void item_user_lock_init(void)
{
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  pthread_mutex_init(&LOCK_user_locks,MY_MUTEX_INIT_SLOW);
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  hash_init(&hash_user_locks,system_charset_info,
	    16,0,0,(hash_get_key) ull_get_key,NULL,0);
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  item_user_lock_inited= 1;
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}

void item_user_lock_free(void)
{
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  if (item_user_lock_inited)
  {
    item_user_lock_inited= 0;
    hash_free(&hash_user_locks);
    pthread_mutex_destroy(&LOCK_user_locks);
  }
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}

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void item_user_lock_release(User_level_lock *ull)
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{
  ull->locked=0;
  if (--ull->count)
    pthread_cond_signal(&ull->cond);
  else
    delete ull;
}

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/*
   Wait until we are at or past the given position in the master binlog
   on the slave
 */

longlong Item_master_pos_wait::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  THD* thd = current_thd;
  String *log_name = args[0]->val_str(&value);
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  int event_count= 0;
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  null_value=0;
  if (thd->slave_thread || !log_name || !log_name->length())
  {
    null_value = 1;
    return 0;
  }
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  longlong pos = (ulong)args[1]->val_int();
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  longlong timeout = (arg_count==3) ? args[2]->val_int() : 0 ;
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#ifdef HAVE_REPLICATION
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  if ((event_count = active_mi->rli.wait_for_pos(thd, log_name, pos, timeout)) == -2)
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  {
    null_value = 1;
    event_count=0;
  }
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#endif
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  return event_count;
}

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#ifdef EXTRA_DEBUG
void debug_sync_point(const char* lock_name, uint lock_timeout)
{
  THD* thd=current_thd;
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  User_level_lock* ull;
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  struct timespec abstime;
  int lock_name_len,error=0;
  lock_name_len=strlen(lock_name);
  pthread_mutex_lock(&LOCK_user_locks);

  if (thd->ull)
  {
    item_user_lock_release(thd->ull);
    thd->ull=0;
  }

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  /*
    If the lock has not been aquired by some client, we do not want to
    create an entry for it, since we immediately release the lock. In
    this case, we will not be waiting, but rather, just waste CPU and
    memory on the whole deal
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  */
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  if (!(ull= ((User_level_lock*) hash_search(&hash_user_locks, lock_name,
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				 lock_name_len))))
  {
    pthread_mutex_unlock(&LOCK_user_locks);
    return;
  }
  ull->count++;

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  /*
    Structure is now initialized.  Try to get the lock.
    Set up control struct to allow others to abort locks
  */
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  thd->proc_info="User lock";
  thd->mysys_var->current_mutex= &LOCK_user_locks;
  thd->mysys_var->current_cond=  &ull->cond;

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  set_timespec(abstime,lock_timeout);
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  while (!thd->killed &&
	 (error=pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime))
	 != ETIME && error != ETIMEDOUT && ull->locked) ;
  if (ull->locked)
  {
    if (!--ull->count)
      delete ull;				// Should never happen
  }
  else
  {
    ull->locked=1;
    ull->thread=thd->real_id;
    thd->ull=ull;
  }
  pthread_mutex_unlock(&LOCK_user_locks);
  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->proc_info=0;
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond=  0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);
  pthread_mutex_lock(&LOCK_user_locks);
  if (thd->ull)
  {
    item_user_lock_release(thd->ull);
    thd->ull=0;
  }
  pthread_mutex_unlock(&LOCK_user_locks);
}

#endif

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/*
  Get a user level lock. If the thread has an old lock this is first released.
  Returns 1:  Got lock
  Returns 0:  Timeout
  Returns NULL: Error
*/

longlong Item_func_get_lock::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  longlong timeout=args[1]->val_int();
  struct timespec abstime;
  THD *thd=current_thd;
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  User_level_lock *ull;
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  int error=0;
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  /*
    In slave thread no need to get locks, everything is serialized. Anyway
    there is no way to make GET_LOCK() work on slave like it did on master
    (i.e. make it return exactly the same value) because we don't have the
    same other concurrent threads environment. No matter what we return here,
    it's not guaranteed to be same as on master.
  */
  if (thd->slave_thread)
    return 1;

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  pthread_mutex_lock(&LOCK_user_locks);

  if (!res || !res->length())
  {
    pthread_mutex_unlock(&LOCK_user_locks);
    null_value=1;
    return 0;
  }
  null_value=0;

  if (thd->ull)
  {
    item_user_lock_release(thd->ull);
    thd->ull=0;
  }

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  if (!(ull= ((User_level_lock *) hash_search(&hash_user_locks,
                                              (byte*) res->ptr(),
                                              res->length()))))
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  {
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    ull=new User_level_lock(res->ptr(),res->length(), thd->thread_id);
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    if (!ull || !ull->initialized())
    {
      delete ull;
      pthread_mutex_unlock(&LOCK_user_locks);
      null_value=1;				// Probably out of memory
      return 0;
    }
    ull->thread=thd->real_id;
    thd->ull=ull;
    pthread_mutex_unlock(&LOCK_user_locks);
    return 1;					// Got new lock
  }
  ull->count++;

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  /*
    Structure is now initialized.  Try to get the lock.
    Set up control struct to allow others to abort locks.
  */
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  thd->proc_info="User lock";
  thd->mysys_var->current_mutex= &LOCK_user_locks;
  thd->mysys_var->current_cond=  &ull->cond;

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  set_timespec(abstime,timeout);
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  while (!thd->killed &&
	 (error=pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime))
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	 != ETIME && error != ETIMEDOUT && error != EINVAL && ull->locked) ;
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  if (thd->killed)
    error=EINTR;				// Return NULL
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  if (ull->locked)
  {
    if (!--ull->count)
      delete ull;				// Should never happen
    if (error != ETIME && error != ETIMEDOUT)
    {
      error=1;
      null_value=1;				// Return NULL
    }
  }
  else
  {
    ull->locked=1;
    ull->thread=thd->real_id;
    thd->ull=ull;
    error=0;
  }
  pthread_mutex_unlock(&LOCK_user_locks);

  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->proc_info=0;
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond=  0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);

  return !error ? 1 : 0;
}


/*
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  Release a user level lock.
  Return:
    1 if lock released
    0 if lock wasn't held
    (SQL) NULL if no such lock
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*/

longlong Item_func_release_lock::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
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  User_level_lock *ull;
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  longlong result;
  if (!res || !res->length())
  {
    null_value=1;
    return 0;
  }
  null_value=0;

  result=0;
  pthread_mutex_lock(&LOCK_user_locks);
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  if (!(ull= ((User_level_lock*) hash_search(&hash_user_locks,
                                             (const byte*) res->ptr(),
                                             res->length()))))
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  {
    null_value=1;
  }
  else
  {
    if (ull->locked && pthread_equal(pthread_self(),ull->thread))
    {
      result=1;					// Release is ok
      item_user_lock_release(ull);
      current_thd->ull=0;
    }
  }
  pthread_mutex_unlock(&LOCK_user_locks);
  return result;
}


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longlong Item_func_last_insert_id::val_int()
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{
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  THD *thd= current_thd;
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  DBUG_ASSERT(fixed == 1);
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  if (arg_count)
  {
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    longlong value= args[0]->val_int();
    thd->insert_id(value);
    null_value= args[0]->null_value;
    return value;                       // Avoid side effect of insert_id()
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  }
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  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
  return thd->insert_id();
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}

/* This function is just used to test speed of different functions */

longlong Item_func_benchmark::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff), &my_charset_bin);
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  THD *thd=current_thd;

  for (ulong loop=0 ; loop < loop_count && !thd->killed; loop++)
  {
    switch (args[0]->result_type()) {
    case REAL_RESULT:
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      (void) args[0]->val_real();
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      break;
    case INT_RESULT:
      (void) args[0]->val_int();
      break;
    case STRING_RESULT:
      (void) args[0]->val_str(&tmp);
      break;
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    case ROW_RESULT:
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    default:
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      // This case should never be chosen
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      DBUG_ASSERT(0);
      return 0;
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    }
  }
  return 0;
}

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void Item_func_benchmark::print(String *str)
{
  str->append("benchmark(", 10);
  char buffer[20];
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  // my_charset_bin is good enough for numbers
  String st(buffer, sizeof(buffer), &my_charset_bin);
  st.set((ulonglong)loop_count, &my_charset_bin);
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  str->append(st);
  str->append(',');
  args[0]->print(str);
  str->append(')');
}

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#define extra_size sizeof(double)

static user_var_entry *get_variable(HASH *hash, LEX_STRING &name,
				    bool create_if_not_exists)
{
  user_var_entry *entry;

  if (!(entry = (user_var_entry*) hash_search(hash, (byte*) name.str,
					      name.length)) &&
      create_if_not_exists)
  {
    uint size=ALIGN_SIZE(sizeof(user_var_entry))+name.length+1+extra_size;
    if (!hash_inited(hash))
      return 0;
    if (!(entry = (user_var_entry*) my_malloc(size,MYF(MY_WME))))
      return 0;
    entry->name.str=(char*) entry+ ALIGN_SIZE(sizeof(user_var_entry))+
      extra_size;
    entry->name.length=name.length;
    entry->value=0;
    entry->length=0;
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    entry->update_query_id=0;
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    entry->collation.set(NULL, DERIVATION_IMPLICIT);
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    /*
      If we are here, we were called from a SET or a query which sets a
      variable. Imagine it is this:
      INSERT INTO t SELECT @a:=10, @a:=@a+1.
      Then when we have a Item_func_get_user_var (because of the @a+1) so we
      think we have to write the value of @a to the binlog. But before that,
      we have a Item_func_set_user_var to create @a (@a:=10), in this we mark
      the variable as "already logged" (line below) so that it won't be logged
      by Item_func_get_user_var (because that's not necessary).
    */
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    entry->used_query_id=current_thd->query_id;
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    entry->type=STRING_RESULT;
    memcpy(entry->name.str, name.str, name.length+1);
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    if (my_hash_insert(hash,(byte*) entry))
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    {
      my_free((char*) entry,MYF(0));
      return 0;
    }
  }
  return entry;
}

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/*
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  When a user variable is updated (in a SET command or a query like
  SELECT @a:= ).
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*/
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bool Item_func_set_user_var::fix_fields(THD *thd, TABLE_LIST *tables,
					Item **ref)
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{
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  DBUG_ASSERT(fixed == 0);
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  /* fix_fields will call Item_func_set_user_var::fix_length_and_dec */
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  if (Item_func::fix_fields(thd, tables, ref) ||
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      !(entry= get_variable(&thd->user_vars, name, 1)))
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    return TRUE;
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  /* 
     Remember the last query which updated it, this way a query can later know
     if this variable is a constant item in the query (it is if update_query_id
     is different from query_id).
  */
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  entry->update_query_id= thd->query_id;
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  /*
    As it is wrong and confusing to associate any 
    character set with NULL, @a should be latin2
    after this query sequence:

      SET @a=_latin2'string';
      SET @a=NULL;

    I.e. the second query should not change the charset
    to the current default value, but should keep the 
    original value assigned during the first query.
    In order to do it, we don't copy charset
    from the argument if the argument is NULL
    and the variable has previously been initialized.
  */
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  null_item= (args[0]->type() == NULL_ITEM);
  if (!entry->collation.collation || !null_item)
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    entry->collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
  collation.set(entry->collation.collation, DERIVATION_IMPLICIT);
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  cached_result_type= args[0]->result_type();
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  return FALSE;
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}


void
Item_func_set_user_var::fix_length_and_dec()
{
  maybe_null=args[0]->maybe_null;
  max_length=args[0]->max_length;
  decimals=args[0]->decimals;
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  collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
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}

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/*
  Set value to user variable.

  SYNOPSYS
    update_hash()
    entry    - pointer to structure representing variable
    set_null - should we set NULL value ?
    ptr      - pointer to buffer with new value
    length   - length of new value
    type     - type of new value
    cs       - charset info for new value
    dv       - derivation for new value

  RETURN VALUE
    False - success, True - failure
*/

static bool
update_hash(user_var_entry *entry, bool set_null, void *ptr, uint length,
            Item_result type, CHARSET_INFO *cs, Derivation dv)
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{
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  if (set_null)
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  {
    char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
    if (entry->value && entry->value != pos)
      my_free(entry->value,MYF(0));
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    entry->value= 0;
    entry->length= 0;
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  }
  else
  {
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    if (type == STRING_RESULT)
      length++;					// Store strings with end \0
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    if (length <= extra_size)
    {
      /* Save value in value struct */
      char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
      if (entry->value != pos)
      {
	if (entry->value)
	  my_free(entry->value,MYF(0));
	entry->value=pos;
      }
    }
    else
    {
      /* Allocate variable */
      if (entry->length != length)
      {
	char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
	if (entry->value == pos)
	  entry->value=0;
	if (!(entry->value=(char*) my_realloc(entry->value, length,
					      MYF(MY_ALLOW_ZERO_PTR))))
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	  return 1;
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      }
    }
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    if (type == STRING_RESULT)
    {
      length--;					// Fix length change above
      entry->value[length]= 0;			// Store end \0
    }
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    memcpy(entry->value,ptr,length);
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    if (type == DECIMAL_RESULT)
      ((my_decimal*)entry->value)->fix_buffer_pointer();
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    entry->length= length;
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    entry->collation.set(cs, dv);
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  }
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  entry->type=type;
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  return 0;
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}
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bool
Item_func_set_user_var::update_hash(void *ptr, uint length, Item_result type,
                                    CHARSET_INFO *cs, Derivation dv)
{
3577 3578 3579 3580 3581 3582
  /*
    If we set a variable explicitely to NULL then keep the old
    result type of the variable
  */
  if ((null_value= args[0]->null_value) && null_item)
    type= entry->type;                          // Don't change type of item
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  if (::update_hash(entry, (null_value= args[0]->null_value),
                    ptr, length, type, cs, dv))
  {
    current_thd->fatal_error();     // Probably end of memory
    null_value= 1;
    return 1;
  }
  return 0;
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}


3594 3595
/* Get the value of a variable as a double */

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double user_var_entry::val_real(my_bool *null_value)
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{
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  if ((*null_value= (value == 0)))
    return 0.0;

  switch (type) {
  case REAL_RESULT:
    return *(double*) value;
  case INT_RESULT:
    return (double) *(longlong*) value;
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  case DECIMAL_RESULT:
  {
    double result;
    my_decimal2double(E_DEC_FATAL_ERROR, (my_decimal *)value, &result);
    return result;
  }
3612
  case STRING_RESULT:
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    return my_atof(value);                      // This is null terminated
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  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
3618
  return 0.0;					// Impossible
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}


3622 3623 3624
/* Get the value of a variable as an integer */

longlong user_var_entry::val_int(my_bool *null_value)
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{
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  if ((*null_value= (value == 0)))
    return LL(0);

  switch (type) {
  case REAL_RESULT:
    return (longlong) *(double*) value;
  case INT_RESULT:
    return *(longlong*) value;
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  case DECIMAL_RESULT:
  {
    longlong result;
3637
    my_decimal2int(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, &result);
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    return result;
  }
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  case STRING_RESULT:
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  {
    int error;
    return my_strtoll10(value, (char**) 0, &error);// String is null terminated
  }
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  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
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  return LL(0);					// Impossible
}


/* Get the value of a variable as a string */

String *user_var_entry::val_str(my_bool *null_value, String *str,
				uint decimals)
{
  if ((*null_value= (value == 0)))
    return (String*) 0;

  switch (type) {
  case REAL_RESULT:
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    str->set(*(double*) value, decimals, &my_charset_bin);
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    break;
  case INT_RESULT:
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    str->set(*(longlong*) value, &my_charset_bin);
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    break;
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  case DECIMAL_RESULT:
    my_decimal2string(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, 0, 0, str);
    break;
3671
  case STRING_RESULT:
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    if (str->copy(value, length, collation.collation))
3673
      str= 0;					// EOM error
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  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
3678
  return(str);
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}

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/* Get the value of a variable as a decimal */

my_decimal *user_var_entry::val_decimal(my_bool *null_value, my_decimal *val)
{
  if ((*null_value= (value == 0)))
    return 0;

  switch (type) {
  case REAL_RESULT:
    double2my_decimal(E_DEC_FATAL_ERROR, *(double*) value, val);
    break;
  case INT_RESULT:
    int2my_decimal(E_DEC_FATAL_ERROR, *(longlong*) value, 0, val);
    break;
  case DECIMAL_RESULT:
    val= (my_decimal *)value;
    break;
  case STRING_RESULT:
    str2my_decimal(E_DEC_FATAL_ERROR, value, length, collation.collation, val);
    break;
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
  }
  return(val);
}

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/*
  This functions is invoked on SET @variable or @variable:= expression.
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  Evaluate (and check expression), store results.
3711 3712 3713 3714 3715

  SYNOPSYS
    Item_func_set_user_var::check()

  NOTES
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    For now it always return OK. All problem with value evaluating
    will be caught by thd->net.report_error check in sql_set_variables().
3718 3719

  RETURN
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    FALSE OK.
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*/

bool
Item_func_set_user_var::check()
{
  DBUG_ENTER("Item_func_set_user_var::check");

  switch (cached_result_type) {
  case REAL_RESULT:
  {
3731
    save_result.vreal= args[0]->val_real();
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    break;
  }
  case INT_RESULT:
  {
    save_result.vint= args[0]->val_int();
    break;
  }
  case STRING_RESULT:
  {
    save_result.vstr= args[0]->val_str(&value);
    break;
  }
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  case DECIMAL_RESULT:
  {
    save_result.vdec= args[0]->val_decimal(&decimal_buff);
    break;
  }
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  case ROW_RESULT:
  default:
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    // This case should never be chosen
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    DBUG_ASSERT(0);
    break;
  }
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  DBUG_RETURN(FALSE);
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}

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/*
  This functions is invoked on SET @variable or @variable:= expression.

  SYNOPSIS
    Item_func_set_user_var::update()

  NOTES
    We have to store the expression as such in the variable, independent of
    the value method used by the user

  RETURN
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    0	OK
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    1	EOM Error

*/

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bool
Item_func_set_user_var::update()
{
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  bool res;
  DBUG_ENTER("Item_func_set_user_var::update");
  LINT_INIT(res);

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  switch (cached_result_type) {
  case REAL_RESULT:
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  {
3785
    res= update_hash((void*) &save_result.vreal,sizeof(save_result.vreal),
3786
		     REAL_RESULT, &my_charset_bin, DERIVATION_IMPLICIT);
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    break;
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  }
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  case INT_RESULT:
3790
  {
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    res= update_hash((void*) &save_result.vint, sizeof(save_result.vint),
3792
		     INT_RESULT, &my_charset_bin, DERIVATION_IMPLICIT);
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    break;
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  }
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  case STRING_RESULT:
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  {
3797
    if (!save_result.vstr)					// Null value
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      res= update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin,
3799
		       DERIVATION_IMPLICIT);
3800
    else
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      res= update_hash((void*) save_result.vstr->ptr(),
		       save_result.vstr->length(), STRING_RESULT,
		       save_result.vstr->charset(),
3804
		       DERIVATION_IMPLICIT);
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    break;
  }
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  case DECIMAL_RESULT:
  {
    if (!save_result.vdec)					// Null value
      res= update_hash((void*) 0, 0, DECIMAL_RESULT, &my_charset_bin,
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                       DERIVATION_IMPLICIT);
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    else
      res= update_hash((void*) save_result.vdec,
                       sizeof(my_decimal), DECIMAL_RESULT,
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                       &my_charset_bin, DERIVATION_IMPLICIT);
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    break;
  }
3818
  case ROW_RESULT:
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  default:
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    // This case should never be chosen
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    DBUG_ASSERT(0);
    break;
  }
3824
  DBUG_RETURN(res);
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}


3828
double Item_func_set_user_var::val_real()
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{
3830
  DBUG_ASSERT(fixed == 1);
3831
  check();
3832
  update();					// Store expression
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  return entry->val_real(&null_value);
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}

3836
longlong Item_func_set_user_var::val_int()
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{
3838
  DBUG_ASSERT(fixed == 1);
3839
  check();
3840 3841
  update();					// Store expression
  return entry->val_int(&null_value);
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}

3844
String *Item_func_set_user_var::val_str(String *str)
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{
3846
  DBUG_ASSERT(fixed == 1);
3847
  check();
3848 3849
  update();					// Store expression
  return entry->val_str(&null_value, str, decimals);
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}


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my_decimal *Item_func_set_user_var::val_decimal(my_decimal *val)
{
  DBUG_ASSERT(fixed == 1);
  check();
  update();					// Store expression
  return entry->val_decimal(&null_value, val);
}


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void Item_func_set_user_var::print(String *str)
{
3864 3865 3866
  str->append("(@", 2);
  str->append(name.str, name.length);
  str->append(":=", 2);
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  args[0]->print(str);
  str->append(')');
}


3872 3873 3874 3875 3876 3877 3878 3879 3880 3881
void Item_func_set_user_var::print_as_stmt(String *str)
{
  str->append("set @", 5);
  str->append(name.str, name.length);
  str->append(":=", 2);
  args[0]->print(str);
  str->append(')');
}


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String *
Item_func_get_user_var::val_str(String *str)
{
3885
  DBUG_ASSERT(fixed == 1);
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  DBUG_ENTER("Item_func_get_user_var::val_str");
3887
  if (!var_entry)
3888
    DBUG_RETURN((String*) 0);			// No such variable
3889
  DBUG_RETURN(var_entry->val_str(&null_value, str, decimals));
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}


3893
double Item_func_get_user_var::val_real()
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{
3895
  DBUG_ASSERT(fixed == 1);
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  if (!var_entry)
    return 0.0;					// No such variable
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  return (var_entry->val_real(&null_value));
}


my_decimal *Item_func_get_user_var::val_decimal(my_decimal *dec)
{
  DBUG_ASSERT(fixed == 1);
  if (!var_entry)
    return 0;
  return var_entry->val_decimal(&null_value, dec);
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}


longlong Item_func_get_user_var::val_int()
{
3913
  DBUG_ASSERT(fixed == 1);
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  if (!var_entry)
    return LL(0);				// No such variable
  return (var_entry->val_int(&null_value));
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}


3920
/*
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  Get variable by name and, if necessary, put the record of variable 
  use into the binary log.
  
  SYNOPSIS
    get_var_with_binlog()
      thd        Current thread
      name       Variable name 
      out_entry  [out] variable structure or NULL. The pointer is set 
                 regardless of whether function succeeded or not.

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  When a user variable is invoked from an update query (INSERT, UPDATE etc),
  stores this variable and its value in thd->user_var_events, so that it can be
  written to the binlog (will be written just before the query is written, see
  log.cc).
3935 3936 3937
  
  RETURN
    0  OK 
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    1  Failed to put appropriate record into binary log
3939
    
3940 3941
*/

3942 3943
int get_var_with_binlog(THD *thd, LEX_STRING &name, 
                        user_var_entry **out_entry)
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{
3945
  BINLOG_USER_VAR_EVENT *user_var_event;
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  user_var_entry *var_entry;
  var_entry= get_variable(&thd->user_vars, name, 0);
3948
  
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  if (!(opt_bin_log && is_update_query(thd->lex->sql_command)))
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  {
    *out_entry= var_entry;
    return 0;
  }
3954 3955

  if (!var_entry)
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  {
3957
    /*
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      If the variable does not exist, it's NULL, but we want to create it so
      that it gets into the binlog (if it didn't, the slave could be
      influenced by a variable of the same name previously set by another
      thread).
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      We create it like if it had been explicitly set with SET before.
      The 'new' mimics what sql_yacc.yy does when 'SET @a=10;'.
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      sql_set_variables() is what is called from 'case SQLCOM_SET_OPTION'
      in dispatch_command()). Instead of building a one-element list to pass to
      sql_set_variables(), we could instead manually call check() and update();
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      this would save memory and time; but calling sql_set_variables() makes
      one unique place to maintain (sql_set_variables()). 
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    */

    List<set_var_base> tmp_var_list;
    tmp_var_list.push_back(new set_var_user(new Item_func_set_user_var(name,
                                                                       new Item_null())));
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    /* Create the variable */
    if (sql_set_variables(thd, &tmp_var_list))
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      goto err;
    if (!(var_entry= get_variable(&thd->user_vars, name, 0)))
      goto err;
  }
  else if (var_entry->used_query_id == thd->query_id)
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  {
    /* 
       If this variable was already stored in user_var_events by this query
       (because it's used in more than one place in the query), don't store
       it.
    */
    *out_entry= var_entry;
    return 0;
  }
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  uint size;
  /*
    First we need to store value of var_entry, when the next situation
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    appears:
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    > set @a:=1;
    > insert into t1 values (@a), (@a:=@a+1), (@a:=@a+1);
    We have to write to binlog value @a= 1;
  */
  size= ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT)) + var_entry->length;      
  if (!(user_var_event= (BINLOG_USER_VAR_EVENT *) thd->alloc(size)))
    goto err;
  
  user_var_event->value= (char*) user_var_event +
    ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT));
  user_var_event->user_var_event= var_entry;
  user_var_event->type= var_entry->type;
  user_var_event->charset_number= var_entry->collation.collation->number;
  if (!var_entry->value)
  {
    /* NULL value*/
    user_var_event->length= 0;
    user_var_event->value= 0;
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  }
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  else
  {
    user_var_event->length= var_entry->length;
    memcpy(user_var_event->value, var_entry->value,
           var_entry->length);
  }
  /* Mark that this variable has been used by this query */
  var_entry->used_query_id= thd->query_id;
  if (insert_dynamic(&thd->user_var_events, (gptr) &user_var_event))
    goto err;
4024 4025 4026
  
  *out_entry= var_entry;
  return 0;
4027

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err:
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  *out_entry= var_entry;
  return 1;
}


void Item_func_get_user_var::fix_length_and_dec()
{
  THD *thd=current_thd;
  int error;
  maybe_null=1;
  decimals=NOT_FIXED_DEC;
  max_length=MAX_BLOB_WIDTH;
4041

4042
  error= get_var_with_binlog(thd, name, &var_entry);
4043 4044

  if (var_entry)
4045
  {
4046
    collation.set(var_entry->collation);
4047 4048 4049
    switch (var_entry->type) {
    case REAL_RESULT:
      max_length= DBL_DIG + 8;
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      break;
4051 4052
    case INT_RESULT:
      max_length= MAX_BIGINT_WIDTH;
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      decimals=0;
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      break;
    case STRING_RESULT:
      max_length= MAX_BLOB_WIDTH;
      break;
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    case DECIMAL_RESULT:
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      max_length= DECIMAL_MAX_STR_LENGTH;
      decimals= DECIMAL_MAX_SCALE;
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      break;
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    case ROW_RESULT:                            // Keep compiler happy
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    default:
      DBUG_ASSERT(0);
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      break;
4066 4067
    }
  }
4068
  else
4069 4070
  {
    collation.set(&my_charset_bin, DERIVATION_IMPLICIT);
4071
    null_value= 1;
4072
  }
4073

4074 4075
  if (error)
    thd->fatal_error();
4076

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  return;
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}


4081
bool Item_func_get_user_var::const_item() const
4082
{
4083
  return (!var_entry || current_thd->query_id != var_entry->update_query_id);
4084
}
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enum Item_result Item_func_get_user_var::result_type() const
{
  user_var_entry *entry;
  if (!(entry = (user_var_entry*) hash_search(&current_thd->user_vars,
					      (byte*) name.str,
					      name.length)))
    return STRING_RESULT;
  return entry->type;
}

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void Item_func_get_user_var::print(String *str)
{
4100
  str->append("(@", 2);
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  str->append(name.str,name.length);
  str->append(')');
}

4105

4106
bool Item_func_get_user_var::eq(const Item *item, bool binary_cmp) const
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{
  /* Assume we don't have rtti */
  if (this == item)
    return 1;					// Same item is same.
  /* Check if other type is also a get_user_var() object */
  if (item->type() != FUNC_ITEM ||
      ((Item_func*) item)->func_name() != func_name())
    return 0;
  Item_func_get_user_var *other=(Item_func_get_user_var*) item;
  return (name.length == other->name.length &&
	  !memcmp(name.str, other->name.str, name.length));
}


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bool Item_user_var_as_out_param::fix_fields(THD *thd, TABLE_LIST *tables,
                                            Item **ref)
{
  DBUG_ASSERT(fixed == 0);
  if (Item::fix_fields(thd, tables, ref) ||
      !(entry= get_variable(&thd->user_vars, name, 1)))
    return TRUE;
  entry->type= STRING_RESULT;
  /*
    Let us set the same collation which is used for loading
    of fields in LOAD DATA INFILE.
    (Since Item_user_var_as_out_param is used only there).
  */
  entry->collation.set(thd->variables.collation_database);
  entry->update_query_id= thd->query_id;
  return FALSE;
}


void Item_user_var_as_out_param::set_null_value(CHARSET_INFO* cs)
{
  if (::update_hash(entry, TRUE, 0, 0, STRING_RESULT, cs,
                    DERIVATION_IMPLICIT))
    current_thd->fatal_error();			// Probably end of memory
}


void Item_user_var_as_out_param::set_value(const char *str, uint length,
                                           CHARSET_INFO* cs)
{
  if (::update_hash(entry, FALSE, (void*)str, length, STRING_RESULT, cs,
                    DERIVATION_IMPLICIT))
    current_thd->fatal_error();			// Probably end of memory
}


double Item_user_var_as_out_param::val_real()
{
  DBUG_ASSERT(0);
  return 0.0;
}


longlong Item_user_var_as_out_param::val_int()
{
  DBUG_ASSERT(0);
  return 0;
}


String* Item_user_var_as_out_param::val_str(String *str)
{
  DBUG_ASSERT(0);
  return 0;
}


my_decimal* Item_user_var_as_out_param::val_decimal(my_decimal *decimal_buffer)
{
  DBUG_ASSERT(0);
  return 0;
}


void Item_user_var_as_out_param::print(String *str)
{
  str->append('@');
  str->append(name.str,name.length);
}


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longlong Item_func_inet_aton::val_int()
{
4194
  DBUG_ASSERT(fixed == 1);
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  uint byte_result = 0;
  ulonglong result = 0;			// We are ready for 64 bit addresses
  const char *p,* end;
  char c = '.'; // we mark c to indicate invalid IP in case length is 0
  char buff[36];
4200
  int dot_count= 0;
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4201

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  String *s,tmp(buff,sizeof(buff),&my_charset_bin);
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4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218
  if (!(s = args[0]->val_str(&tmp)))		// If null value
    goto err;
  null_value=0;

  end= (p = s->ptr()) + s->length();
  while (p < end)
  {
    c = *p++;
    int digit = (int) (c - '0');		// Assume ascii
    if (digit >= 0 && digit <= 9)
    {
      if ((byte_result = byte_result * 10 + digit) > 255)
	goto err;				// Wrong address
    }
    else if (c == '.')
    {
4219
      dot_count++;
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      result= (result << 8) + (ulonglong) byte_result;
      byte_result = 0;
    }
    else
      goto err;					// Invalid character
  }
  if (c != '.')					// IP number can't end on '.'
4227
  {
4228 4229 4230 4231 4232 4233
    /*
      Handle short-forms addresses according to standard. Examples:
      127		-> 0.0.0.127
      127.1		-> 127.0.0.1
      127.2.1		-> 127.2.0.1
    */
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    switch (dot_count) {
4235 4236
    case 1: result<<= 8; /* Fall through */
    case 2: result<<= 8; /* Fall through */
4237
    }
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4238
    return (result << 8) + (ulonglong) byte_result;
4239
  }
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4240 4241 4242 4243 4244 4245

err:
  null_value=1;
  return 0;
}

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4246

4247
void Item_func_match::init_search(bool no_order)
4248
{
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4249
  DBUG_ENTER("Item_func_match::init_search");
4250 4251

  /* Check if init_search() has been called before */
4252
  if (ft_handler)
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4253
    DBUG_VOID_RETURN;
4254

4255
  if (key == NO_SUCH_KEY)
4256 4257
  {
    List<Item> fields;
4258
    fields.push_back(new Item_string(" ",1, cmp_collation.collation));
4259 4260
    for (uint i=1; i < arg_count; i++)
      fields.push_back(args[i]);
4261
    concat=new Item_func_concat_ws(fields);
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    /*
      Above function used only to get value and do not need fix_fields for it:
      Item_string - basic constant
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      fields - fix_fields() was already called for this arguments
      Item_func_concat_ws - do not need fix_fields() to produce value
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    */
    concat->quick_fix_field();
4269
  }
4270

4271 4272
  if (master)
  {
4273 4274
    join_key=master->join_key=join_key|master->join_key;
    master->init_search(no_order);
4275 4276
    ft_handler=master->ft_handler;
    join_key=master->join_key;
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4277
    DBUG_VOID_RETURN;
4278 4279
  }

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  String *ft_tmp= 0;
4281

4282
  // MATCH ... AGAINST (NULL) is meaningless, but possible
4283
  if (!(ft_tmp=key_item()->val_str(&value)))
4284
  {
4285 4286
    ft_tmp= &value;
    value.set("",0,cmp_collation.collation);
4287 4288
  }

4289 4290
  if (ft_tmp->charset() != cmp_collation.collation)
  {
4291
    uint dummy_errors;
4292
    search_value.copy(ft_tmp->ptr(), ft_tmp->length(), ft_tmp->charset(),
4293
                      cmp_collation.collation, &dummy_errors);
4294
    ft_tmp= &search_value;
4295 4296
  }

4297 4298
  if (join_key && !no_order)
    flags|=FT_SORTED;
4299
  ft_handler=table->file->ft_init_ext(flags, key, ft_tmp);
4300 4301 4302

  if (join_key)
    table->file->ft_handler=ft_handler;
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  DBUG_VOID_RETURN;
4305 4306
}

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4307

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bool Item_func_match::fix_fields(THD *thd, TABLE_LIST *tlist, Item **ref)
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{
4310
  DBUG_ASSERT(fixed == 0);
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  Item *item;
4312
  LINT_INIT(item);				// Safe as arg_count is > 1
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4313

4314 4315 4316
  maybe_null=1;
  join_key=0;

4317 4318 4319 4320 4321
  /*
    const_item is assumed in quite a bit of places, so it would be difficult
    to remove;  If it would ever to be removed, this should include
    modifications to find_best and auto_close as complement to auto_init code
    above.
4322
   */
4323 4324
  if (Item_func::fix_fields(thd, tlist, ref) ||
      !args[0]->const_during_execution())
4325 4326
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"AGAINST");
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    return TRUE;
4328
  }
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4330 4331
  const_item_cache=0;
  for (uint i=1 ; i < arg_count ; i++)
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  {
4333
    item=args[i];
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    if (item->type() == Item::REF_ITEM)
4335 4336
      args[i]= item= *((Item_ref *)item)->ref;
    if (item->type() != Item::FIELD_ITEM)
4337
      key=NO_SUCH_KEY;
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  }
4339 4340
  /*
    Check that all columns come from the same table.
4341
    We've already checked that columns in MATCH are fields so
4342 4343 4344
    PARAM_TABLE_BIT can only appear from AGAINST argument.
  */
  if ((used_tables_cache & ~PARAM_TABLE_BIT) != item->used_tables())
4345
    key=NO_SUCH_KEY;
4346

4347
  if (key == NO_SUCH_KEY && !(flags & FT_BOOL))
4348 4349
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"MATCH");
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    return TRUE;
4351
  }
4352
  table=((Item_field *)item)->field->table;
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  if (!(table->file->table_flags() & HA_CAN_FULLTEXT))
4354
  {
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    my_error(ER_TABLE_CANT_HANDLE_FT, MYF(0));
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    return 1;
4357
  }
4358 4359
  table->fulltext_searched=1;
  return agg_arg_collations_for_comparison(cmp_collation, args+1, arg_count-1);
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}
4361

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bool Item_func_match::fix_index()
{
  Item_field *item;
4365
  uint ft_to_key[MAX_KEY], ft_cnt[MAX_KEY], fts=0, keynr;
4366
  uint max_cnt=0, mkeys=0, i;
4367

4368
  if (key == NO_SUCH_KEY)
4369
    return 0;
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4370

4371
  for (keynr=0 ; keynr < table->s->keys ; keynr++)
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  {
4373
    if ((table->key_info[keynr].flags & HA_FULLTEXT) &&
4374
        (table->keys_in_use_for_query.is_set(keynr)))
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    {
4376
      ft_to_key[fts]=keynr;
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4377 4378 4379 4380 4381 4382
      ft_cnt[fts]=0;
      fts++;
    }
  }

  if (!fts)
4383
    goto err;
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4384

4385
  for (i=1; i < arg_count; i++)
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  {
4387
    item=(Item_field*)args[i];
4388
    for (keynr=0 ; keynr < fts ; keynr++)
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    {
4390
      KEY *ft_key=&table->key_info[ft_to_key[keynr]];
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      uint key_parts=ft_key->key_parts;

      for (uint part=0 ; part < key_parts ; part++)
      {
	if (item->field->eq(ft_key->key_part[part].field))
4396
	  ft_cnt[keynr]++;
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      }
    }
  }

4401
  for (keynr=0 ; keynr < fts ; keynr++)
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  {
4403
    if (ft_cnt[keynr] > max_cnt)
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    {
4405
      mkeys=0;
4406 4407
      max_cnt=ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
4408 4409
      continue;
    }
4410
    if (max_cnt && ft_cnt[keynr] == max_cnt)
4411 4412
    {
      mkeys++;
4413 4414
      ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
4415
      continue;
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    }
  }

4419
  for (keynr=0 ; keynr <= mkeys ; keynr++)
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  {
4421 4422
    // partial keys doesn't work
    if (max_cnt < arg_count-1 ||
4423
        max_cnt < table->key_info[ft_to_key[keynr]].key_parts)
4424
      continue;
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4425

4426
    key=ft_to_key[keynr];
4427

4428 4429 4430
    return 0;
  }

4431
err:
4432
  if (flags & FT_BOOL)
4433
  {
4434
    key=NO_SUCH_KEY;
4435 4436
    return 0;
  }
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4437 4438
  my_message(ER_FT_MATCHING_KEY_NOT_FOUND,
             ER(ER_FT_MATCHING_KEY_NOT_FOUND), MYF(0));
4439
  return 1;
4440 4441
}

4442

4443
bool Item_func_match::eq(const Item *item, bool binary_cmp) const
4444
{
4445 4446
  if (item->type() != FUNC_ITEM || ((Item_func*)item)->functype() != FT_FUNC ||
      flags != ((Item_func_match*)item)->flags)
4447 4448 4449 4450 4451
    return 0;

  Item_func_match *ifm=(Item_func_match*) item;

  if (key == ifm->key && table == ifm->table &&
4452
      key_item()->eq(ifm->key_item(), binary_cmp))
4453
    return 1;
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4454 4455 4456 4457

  return 0;
}

4458

4459
double Item_func_match::val_real()
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4460
{
4461
  DBUG_ASSERT(fixed == 1);
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4462
  DBUG_ENTER("Item_func_match::val");
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4463
  if (ft_handler == NULL)
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    DBUG_RETURN(-1.0);
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4465

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  if (table->null_row) /* NULL row from an outer join */
    return 0.0;

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  if (join_key)
  {
    if (table->file->ft_handler)
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4472
      DBUG_RETURN(ft_handler->please->get_relevance(ft_handler));
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4473 4474 4475
    join_key=0;
  }

4476
  if (key == NO_SUCH_KEY)
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  {
4478 4479
    String *a= concat->val_str(&value);
    if ((null_value= (a == 0)))
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      DBUG_RETURN(0);
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
				      (byte *)a->ptr(), a->length()));
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4483 4484
  }
  else
4485 4486
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
                                                   table->record[0], 0));
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4487 4488
}

4489 4490
void Item_func_match::print(String *str)
{
4491
  str->append("(match ", 7);
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  print_args(str, 1);
4493
  str->append(" against (", 10);
4494
  args[0]->print(str);
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  if (flags & FT_BOOL)
4496
    str->append(" in boolean mode", 16);
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  else if (flags & FT_EXPAND)
    str->append(" with query expansion", 21);
4499
  str->append("))", 2);
4500
}
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4501

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longlong Item_func_bit_xor::val_int()
{
4504
  DBUG_ASSERT(fixed == 1);
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  ulonglong arg1= (ulonglong) args[0]->val_int();
  ulonglong arg2= (ulonglong) args[1]->val_int();
4507
  if ((null_value= (args[0]->null_value || args[1]->null_value)))
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    return 0;
  return (longlong) (arg1 ^ arg2);
}

4512

4513 4514 4515 4516
/***************************************************************************
  System variables
****************************************************************************/

4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537
/*
  Return value of an system variable base[.name] as a constant item

  SYNOPSIS
    get_system_var()
    thd			Thread handler
    var_type		global / session
    name		Name of base or system variable
    component		Component.

  NOTES
    If component.str = 0 then the variable name is in 'name'

  RETURN
    0	error
    #	constant item
*/
  

Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
		     LEX_STRING component)
4538
{
4539 4540
  if (component.str == 0 &&
      !my_strcasecmp(system_charset_info, name.str, "VERSION"))
4541 4542
    return new Item_string("@@VERSION", server_version,
			   (uint) strlen(server_version),
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4543
			   system_charset_info, DERIVATION_SYSCONST);
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  Item *item;
  sys_var *var;
4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *pos;
  LEX_STRING *base_name, *component_name;

  if (component.str)
  {
    base_name= &component;
    component_name= &name;
  }
  else
  {
    base_name= &name;
    component_name= &component;			// Empty string
  }
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4560

4561
  if (!(var= find_sys_var(base_name->str, base_name->length)))
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    return 0;
4563 4564 4565 4566
  if (component.str)
  {
    if (!var->is_struct())
    {
4567
      my_error(ER_VARIABLE_IS_NOT_STRUCT, MYF(0), base_name->str);
4568 4569 4570 4571
      return 0;
    }
  }
  if (!(item=var->item(thd, var_type, component_name)))
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    return 0;					// Impossible
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  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
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  buff[0]='@';
  buff[1]='@';
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  pos=buff+2;
  if (var_type == OPT_SESSION)
    pos=strmov(pos,"session.");
  else if (var_type == OPT_GLOBAL)
    pos=strmov(pos,"global.");
4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593
  
  set_if_smaller(component_name->length, MAX_SYS_VAR_LENGTH);
  set_if_smaller(base_name->length, MAX_SYS_VAR_LENGTH);

  if (component_name->str)
  {
    memcpy(pos, component_name->str, component_name->length);
    pos+= component_name->length;
    *pos++= '.';
  }
  memcpy(pos, base_name->str, base_name->length);
  pos+= base_name->length;

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  // set_name() will allocate the name
4595
  item->set_name(buff,(uint) (pos-buff), system_charset_info);
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  return item;
4597
}
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4600 4601
Item *get_system_var(THD *thd, enum_var_type var_type, const char *var_name,
		     uint length, const char *item_name)
4602 4603 4604
{
  Item *item;
  sys_var *var;
4605 4606 4607
  LEX_STRING null_lex_string;

  null_lex_string.str= 0;
4608 4609 4610

  var= find_sys_var(var_name, length);
  DBUG_ASSERT(var != 0);
4611
  if (!(item=var->item(thd, var_type, &null_lex_string)))
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    return 0;						// Impossible
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  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
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  item->set_name(item_name, 0, system_charset_info);	// Will use original name
4615 4616 4617 4618
  return item;
}


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4619 4620
/*
  Check a user level lock.
4621 4622 4623 4624 4625 4626 4627 4628

  SYNOPSIS:
    val_int()

  RETURN VALUES
    1		Available
    0		Already taken
    NULL	Error
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4629 4630
*/

4631
longlong Item_func_is_free_lock::val_int()
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4632
{
4633
  DBUG_ASSERT(fixed == 1);
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4634
  String *res=args[0]->val_str(&value);
4635
  User_level_lock *ull;
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4636 4637

  null_value=0;
4638
  if (!res || !res->length())
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  {
    null_value=1;
    return 0;
  }
  
  pthread_mutex_lock(&LOCK_user_locks);
4645
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
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4646 4647 4648 4649 4650 4651
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 1;
  return 0;
}
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4652

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4653 4654
longlong Item_func_is_used_lock::val_int()
{
4655
  DBUG_ASSERT(fixed == 1);
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4656
  String *res=args[0]->val_str(&value);
4657
  User_level_lock *ull;
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4658 4659 4660 4661 4662 4663

  null_value=1;
  if (!res || !res->length())
    return 0;
  
  pthread_mutex_lock(&LOCK_user_locks);
4664
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
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			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 0;

  null_value=0;
  return ull->thread_id;
}

4674

4675 4676 4677 4678 4679 4680 4681 4682 4683
longlong Item_func_row_count::val_int()
{
  DBUG_ASSERT(fixed == 1);
  THD *thd= current_thd;

  return thd->row_count_func;
}


4684
Item_func_sp::Item_func_sp(sp_name *name)
4685
  :Item_func(), m_name(name), m_sp(NULL), result_field(NULL)
4686
{
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4687
  maybe_null= 1;
4688
  m_name->init_qname(current_thd);
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4689
  dummy_table= (TABLE*) sql_calloc(sizeof(TABLE));
4690 4691
}

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4692

4693
Item_func_sp::Item_func_sp(sp_name *name, List<Item> &list)
4694
  :Item_func(list), m_name(name), m_sp(NULL), result_field(NULL)
4695
{
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4696
  maybe_null= 1;
4697
  m_name->init_qname(current_thd);
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4698
  dummy_table= (TABLE*) sql_calloc(sizeof(TABLE));
4699 4700
}

4701 4702 4703 4704 4705 4706 4707 4708 4709 4710
void
Item_func_sp::cleanup()
{
  if (result_field)
  {
    delete result_field;
    result_field= NULL;
  }
  Item_func::cleanup();
}
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4711

4712 4713 4714
const char *
Item_func_sp::func_name() const
{
4715
  THD *thd= current_thd;
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  /* Calculate length to avoid reallocation of string for sure */
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  uint len= ((m_name->m_db.length +
              m_name->m_name.length)*2 + //characters*quoting
             2 +                         // ` and `
             1 +                         // .
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             1 +                         // end of string
             ALIGN_SIZE(1));             // to avoid String reallocation
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  String qname((char *)alloc_root(thd->mem_root, len), len,
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               system_charset_info);
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  qname.length(0);
  append_identifier(thd, &qname, m_name->m_db.str, m_name->m_db.length);
  qname.append('.');
  append_identifier(thd, &qname, m_name->m_name.str, m_name->m_name.length);
  return qname.ptr();
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}

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Field *
Item_func_sp::sp_result_field(void) const
{
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  Field *field;
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  DBUG_ENTER("Item_func_sp::sp_result_field");
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  if (!m_sp)
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  {
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    if (!(m_sp= sp_find_function(current_thd, m_name, TRUE)))
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    {
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      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
      DBUG_RETURN(0);
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    }
  }
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  if (!dummy_table->s)
  {
    char *empty_name= (char *) "";
    TABLE_SHARE *share;
    dummy_table->s= share= &dummy_table->share_not_to_be_used;      
    dummy_table->alias = empty_name;
    dummy_table->maybe_null = maybe_null;
    dummy_table->in_use= current_thd;
    share->table_cache_key = empty_name;
    share->table_name = empty_name;
  }
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  field= m_sp->make_field(max_length, name, dummy_table);
  DBUG_RETURN(field);
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}


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/*
  Execute function & store value in field

  RETURN
   0  value <> NULL
   1  value =  NULL  or error
*/

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int
Item_func_sp::execute(Field **flp)
{
  Item *it;
  Field *f;
  if (execute(&it))
  {
    null_value= 1;
    return 1;
  }
  if (!(f= *flp))
  {
    *flp= f= sp_result_field();
    f->move_field((f->pack_length() > sizeof(result_buf)) ? 
                  sql_alloc(f->pack_length()) : result_buf);
    f->null_ptr= (uchar *)&null_value;
    f->null_bit= 1;
  }
  it->save_in_field(f, 1);
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  return null_value= f->is_null();
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}


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int
Item_func_sp::execute(Item **itp)
{
  DBUG_ENTER("Item_func_sp::execute");
  THD *thd= current_thd;
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  ulong old_client_capabilites;
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  int res;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  st_sp_security_context save_ctx;
#endif
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  if (! m_sp)
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  {
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    if (!(m_sp= sp_find_function(thd, m_name, TRUE)))
    {
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
      DBUG_RETURN(-1);
    }
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  }
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  old_client_capabilites= thd->client_capabilities;
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  thd->client_capabilities &= ~CLIENT_MULTI_RESULTS;

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#ifndef EMBEDDED_LIBRARY
  my_bool nsok= thd->net.no_send_ok;
  thd->net.no_send_ok= TRUE;
#endif

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (check_routine_access(thd, EXECUTE_ACL, 
			   m_sp->m_db.str, m_sp->m_name.str, 0, 0))
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      DBUG_RETURN(-1);
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  sp_change_security_context(thd, m_sp, &save_ctx);
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  if (save_ctx.changed && 
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      check_routine_access(thd, EXECUTE_ACL, 
			   m_sp->m_db.str, m_sp->m_name.str, 0, 0))
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  {
    sp_restore_security_context(thd, m_sp, &save_ctx);
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    thd->client_capabilities|= old_client_capabilites &  CLIENT_MULTI_RESULTS;
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    DBUG_RETURN(-1);
  }
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#endif
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  /*
    Like for SPs, we don't binlog the substatements. If the statement which
    called this function is an update statement, it will be binlogged; but if
    it's not (e.g. SELECT myfunc()) it won't be binlogged (documented known
    problem).
  */
  tmp_disable_binlog(thd); /* don't binlog the substatements */
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  res= m_sp->execute_function(thd, args, arg_count, itp);

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  reenable_binlog(thd);
  if (res && mysql_bin_log.is_open() &&
      (m_sp->m_chistics->daccess == SP_CONTAINS_SQL ||
       m_sp->m_chistics->daccess == SP_MODIFIES_SQL_DATA))
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 ER_FAILED_ROUTINE_BREAK_BINLOG,
		 ER(ER_FAILED_ROUTINE_BREAK_BINLOG));

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  sp_restore_security_context(thd, m_sp, &save_ctx);
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#endif
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#ifndef EMBEDDED_LIBRARY
  thd->net.no_send_ok= nsok;
#endif
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  thd->client_capabilities|= old_client_capabilites &  CLIENT_MULTI_RESULTS;
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  DBUG_RETURN(res);
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}

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void
Item_func_sp::make_field(Send_field *tmp_field)
{
  Field *field;
  DBUG_ENTER("Item_func_sp::make_field");
  if ((field= sp_result_field()))
  {
    field->make_field(tmp_field);
    delete field;
    DBUG_VOID_RETURN;
  }
  init_make_field(tmp_field, MYSQL_TYPE_VARCHAR);  
  DBUG_VOID_RETURN;
}


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enum enum_field_types
Item_func_sp::field_type() const
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{
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  Field *field;
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  DBUG_ENTER("Item_func_sp::field_type");
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  if (result_field)
    DBUG_RETURN(result_field->type());
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  if ((field= sp_result_field()))
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  {
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    enum_field_types result= field->type();
    delete field;
    DBUG_RETURN(result);
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  }
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  DBUG_RETURN(MYSQL_TYPE_VARCHAR);
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}

4902

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Item_result
Item_func_sp::result_type() const
4905
{
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  Field *field;
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  DBUG_ENTER("Item_func_sp::result_type");
  DBUG_PRINT("info", ("m_sp = %p", m_sp));
4909

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  if (result_field)
    DBUG_RETURN(result_field->result_type());
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  if ((field= sp_result_field()))
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  {
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    Item_result result= field->result_type();
    delete field;
    DBUG_RETURN(result);
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  }
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  DBUG_RETURN(STRING_RESULT);
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}

void
Item_func_sp::fix_length_and_dec()
{
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  Field *field;
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  DBUG_ENTER("Item_func_sp::fix_length_and_dec");

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  if (result_field)
  {
    decimals= result_field->decimals();
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    max_length= result_field->field_length;
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    DBUG_VOID_RETURN;
  }

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  if (!(field= sp_result_field()))
    DBUG_VOID_RETURN;
  decimals= field->decimals();
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  max_length= field->field_length;
  maybe_null= 1;
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  delete field;
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  DBUG_VOID_RETURN;
}
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longlong Item_func_found_rows::val_int()
{
  DBUG_ASSERT(fixed == 1);
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  return current_thd->found_rows();
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}
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Field *
Item_func_sp::tmp_table_field(TABLE *t_arg)
{
  Field *res= 0;
  DBUG_ENTER("Item_func_sp::tmp_table_field");

  if (m_sp)
    res= m_sp->make_field(max_length, (const char *)name, t_arg);
  
  if (!res) 
    res= Item_func::tmp_table_field(t_arg);

  DBUG_RETURN(res);
}