item.cc 200 KB
Newer Older
1
/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
unknown's avatar
unknown committed
2

unknown's avatar
unknown committed
3 4
   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
unknown's avatar
unknown committed
5
   the Free Software Foundation; version 2 of the License.
unknown's avatar
unknown committed
6

unknown's avatar
unknown committed
7 8 9 10
   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.
unknown's avatar
unknown committed
11

unknown's avatar
unknown committed
12 13 14 15 16
   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 */


17
#ifdef USE_PRAGMA_IMPLEMENTATION
unknown's avatar
unknown committed
18 19 20
#pragma implementation				// gcc: Class implementation
#endif
#include "mysql_priv.h"
21
#include <mysql.h>
unknown's avatar
unknown committed
22 23
#include <m_ctype.h>
#include "my_dir.h"
24
#include "sp_rcontext.h"
25 26
#include "sp_head.h"
#include "sql_trigger.h"
27
#include "sql_select.h"
unknown's avatar
unknown committed
28

29 30
const String my_null_string("NULL", 4, default_charset_info);

31 32 33 34 35 36 37 38 39 40
/****************************************************************************/

/* Hybrid_type_traits {_real} */

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

unknown's avatar
unknown committed
41
static const Hybrid_type_traits real_traits_instance;
42 43 44

const Hybrid_type_traits *Hybrid_type_traits::instance()
{
unknown's avatar
unknown committed
45
  return &real_traits_instance;
46 47 48 49 50 51 52 53 54 55 56 57 58 59
}


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


String *
Hybrid_type_traits::val_str(Hybrid_type *val, String *to, uint8 decimals) const
{
60
  to->set_real(val->real, decimals, &my_charset_bin);
61 62 63 64
  return to;
}

/* Hybrid_type_traits_decimal */
unknown's avatar
unknown committed
65
static const Hybrid_type_traits_decimal decimal_traits_instance;
66 67 68

const Hybrid_type_traits_decimal *Hybrid_type_traits_decimal::instance()
{
unknown's avatar
unknown committed
69
  return &decimal_traits_instance;
70 71 72 73 74 75 76 77
}


void
Hybrid_type_traits_decimal::fix_length_and_dec(Item *item, Item *arg) const
{
  item->decimals= arg->decimals;
  item->max_length= min(arg->max_length + DECIMAL_LONGLONG_DIGITS,
unknown's avatar
unknown committed
78
                        DECIMAL_MAX_STR_LENGTH);
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
}


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


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


unknown's avatar
unknown committed
99 100 101 102
/**
  @todo
  what is '4' for scale?
*/
103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144
void Hybrid_type_traits_decimal::div(Hybrid_type *val, ulonglong u) const
{
  int2my_decimal(E_DEC_FATAL_ERROR, u, TRUE, &val->dec_buf[2]);
  /* XXX: what is '4' for scale? */
  my_decimal_div(E_DEC_FATAL_ERROR,
                 &val->dec_buf[val->used_dec_buf_no ^ 1],
                 &val->dec_buf[val->used_dec_buf_no],
                 &val->dec_buf[2], 4);
  val->used_dec_buf_no^= 1;
}


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


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


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

/* Hybrid_type_traits_integer */
unknown's avatar
unknown committed
145
static const Hybrid_type_traits_integer integer_traits_instance;
146 147 148

const Hybrid_type_traits_integer *Hybrid_type_traits_integer::instance()
{
unknown's avatar
unknown committed
149
  return &integer_traits_instance;
150 151 152 153 154 155
}

void
Hybrid_type_traits_integer::fix_length_and_dec(Item *item, Item *arg) const
{
  item->decimals= 0;
156
  item->max_length= MY_INT64_NUM_DECIMAL_DIGITS;
157 158 159
  item->unsigned_flag= 0;
}

unknown's avatar
unknown committed
160 161 162 163
/*****************************************************************************
** Item functions
*****************************************************************************/

unknown's avatar
unknown committed
164 165 166
/**
  Init all special items.
*/
unknown's avatar
unknown committed
167 168 169 170

void item_init(void)
{
  item_user_lock_init();
171
  uuid_short_init();
unknown's avatar
unknown committed
172 173
}

unknown's avatar
unknown committed
174

unknown's avatar
unknown committed
175 176 177
/**
  @todo
    Make this functions class dependent
unknown's avatar
unknown committed
178
*/
179

unknown's avatar
unknown committed
180 181
bool Item::val_bool()
{
182
  switch(result_type()) {
unknown's avatar
unknown committed
183
  case INT_RESULT:
184
    return val_int() != 0;
unknown's avatar
unknown committed
185 186 187 188 189 190 191 192 193 194 195 196 197 198
  case DECIMAL_RESULT:
  {
    my_decimal decimal_value;
    my_decimal *val= val_decimal(&decimal_value);
    if (val)
      return !my_decimal_is_zero(val);
    return 0;
  }
  case REAL_RESULT:
  case STRING_RESULT:
    return val_real() != 0.0;
  case ROW_RESULT:
  default:
    DBUG_ASSERT(0);
199
    return 0;                                   // Wrong (but safe)
unknown's avatar
unknown committed
200 201 202 203
  }
}


204 205 206 207 208
String *Item::val_string_from_real(String *str)
{
  double nr= val_real();
  if (null_value)
    return 0;					/* purecov: inspected */
209
  str->set_real(nr,decimals, &my_charset_bin);
210 211 212 213 214 215 216 217 218
  return str;
}


String *Item::val_string_from_int(String *str)
{
  longlong nr= val_int();
  if (null_value)
    return 0;
219
  str->set_int(nr, unsigned_flag, &my_charset_bin);
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260
  return str;
}


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


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


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


my_decimal *Item::val_decimal_from_string(my_decimal *decimal_value)
{
  String *res;
  if (!(res= val_str(&str_value)))
    return 0;                                   // NULL or EOM

261 262 263 264 265 266 267 268 269
  if (str2my_decimal(E_DEC_FATAL_ERROR & ~E_DEC_BAD_NUM,
                     res->ptr(), res->length(), res->charset(),
                     decimal_value) & E_DEC_BAD_NUM)
  {
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_TRUNCATED_WRONG_VALUE,
                        ER(ER_TRUNCATED_WRONG_VALUE), "DECIMAL",
                        str_value.c_ptr());
  }
270 271 272 273
  return decimal_value;
}


274 275 276
my_decimal *Item::val_decimal_from_date(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed == 1);
277
  MYSQL_TIME ltime;
278 279 280
  if (get_date(&ltime, TIME_FUZZY_DATE))
  {
    my_decimal_set_zero(decimal_value);
281
    null_value= 1;                               // set NULL, stop processing
282 283 284 285 286 287 288 289 290
    return 0;
  }
  return date2my_decimal(&ltime, decimal_value);
}


my_decimal *Item::val_decimal_from_time(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed == 1);
291
  MYSQL_TIME ltime;
292 293 294 295 296 297 298 299 300
  if (get_time(&ltime))
  {
    my_decimal_set_zero(decimal_value);
    return 0;
  }
  return date2my_decimal(&ltime, decimal_value);
}


301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323
double Item::val_real_from_decimal()
{
  /* Note that fix_fields may not be called for Item_avg_field items */
  double result;
  my_decimal value_buff, *dec_val= val_decimal(&value_buff);
  if (null_value)
    return 0.0;
  my_decimal2double(E_DEC_FATAL_ERROR, dec_val, &result);
  return result;
}


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

324 325
int Item::save_time_in_field(Field *field)
{
326
  MYSQL_TIME ltime;
327
  if (get_time(&ltime))
328
    return set_field_to_null_with_conversions(field, 0);
329 330 331 332 333 334 335
  field->set_notnull();
  return field->store_time(&ltime, MYSQL_TIMESTAMP_TIME);
}


int Item::save_date_in_field(Field *field)
{
336
  MYSQL_TIME ltime;
337
  if (get_date(&ltime, TIME_FUZZY_DATE))
338
    return set_field_to_null_with_conversions(field, 0);
339 340 341 342
  field->set_notnull();
  return field->store_time(&ltime, MYSQL_TIMESTAMP_DATETIME);
}

343

344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
/*
  Store the string value in field directly

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

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

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

  RETURN
    Nonzero value if error
*/

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


375
Item::Item():
376
  rsize(0), name(0), orig_name(0), name_length(0), fixed(0),
377
  is_autogenerated_name(TRUE),
unknown's avatar
unknown committed
378
  collation(&my_charset_bin, DERIVATION_COERCIBLE)
unknown's avatar
unknown committed
379
{
380
  marker= 0;
381
  maybe_null=null_value=with_sum_func=unsigned_flag=0;
382
  decimals= 0; max_length= 0;
383
  with_subselect= 0;
384
  cmp_context= IMPOSSIBLE_RESULT;
385 386 387

  /* Put item in free list so that we can free all items at end */
  THD *thd= current_thd;
388 389
  next= thd->free_list;
  thd->free_list= this;
390
  /*
391
    Item constructor can be called during execution other then SQL_COM
392
    command => we should check thd->lex->current_select on zero (thd->lex
unknown's avatar
unknown committed
393
    can be uninitialised)
394
  */
unknown's avatar
unknown committed
395
  if (thd->lex->current_select)
396
  {
397
    enum_parsing_place place= 
unknown's avatar
unknown committed
398
      thd->lex->current_select->parsing_place;
399 400
    if (place == SELECT_LIST ||
	place == IN_HAVING)
unknown's avatar
unknown committed
401
      thd->lex->current_select->select_n_having_items++;
402
  }
unknown's avatar
unknown committed
403 404
}

unknown's avatar
unknown committed
405 406 407 408
/**
  Constructor used by Item_field, Item_ref & aggregate (sum)
  functions.

409
  Used for duplicating lists in processing queries with temporary
unknown's avatar
unknown committed
410
  tables.
411
*/
412
Item::Item(THD *thd, Item *item):
413
  rsize(0),
414 415
  str_value(item->str_value),
  name(item->name),
416
  orig_name(item->orig_name),
417 418 419 420 421 422 423 424
  max_length(item->max_length),
  marker(item->marker),
  decimals(item->decimals),
  maybe_null(item->maybe_null),
  null_value(item->null_value),
  unsigned_flag(item->unsigned_flag),
  with_sum_func(item->with_sum_func),
  fixed(item->fixed),
unknown's avatar
unknown committed
425 426
  collation(item->collation),
  cmp_context(item->cmp_context)
427
{
428 429
  next= thd->free_list;				// Put in free list
  thd->free_list= this;
430 431
}

unknown's avatar
unknown committed
432

unknown's avatar
unknown committed
433 434 435 436 437
uint Item::decimal_precision() const
{
  Item_result restype= result_type();

  if ((restype == DECIMAL_RESULT) || (restype == INT_RESULT))
438 439 440 441 442
  {
    uint prec= 
      my_decimal_length_to_precision(max_length, decimals, unsigned_flag);
    return min(prec, DECIMAL_MAX_PRECISION);
  }
unknown's avatar
unknown committed
443 444 445 446
  return min(max_length, DECIMAL_MAX_PRECISION);
}


447
void Item::print_item_w_name(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
448
{
449 450
  print(str, query_type);

unknown's avatar
unknown committed
451 452
  if (name)
  {
453
    THD *thd= current_thd;
454
    str->append(STRING_WITH_LEN(" AS "));
455
    append_identifier(thd, str, name, (uint) strlen(name));
unknown's avatar
unknown committed
456 457 458 459
  }
}


460 461 462 463
void Item::cleanup()
{
  DBUG_ENTER("Item::cleanup");
  fixed=0;
464
  marker= 0;
465 466
  if (orig_name)
    name= orig_name;
467 468 469
  DBUG_VOID_RETURN;
}

470

unknown's avatar
unknown committed
471 472
/**
  cleanup() item if it is 'fixed'.
473

unknown's avatar
unknown committed
474
  @param arg   a dummy parameter, is not used here
475 476
*/

477
bool Item::cleanup_processor(uchar *arg)
478 479 480 481 482 483 484
{
  if (fixed)
    cleanup();
  return FALSE;
}


unknown's avatar
unknown committed
485 486
/**
  rename item (used for views, cleanup() return original name).
487

unknown's avatar
unknown committed
488
  @param new_name	new name of item;
489 490 491 492 493
*/

void Item::rename(char *new_name)
{
  /*
unknown's avatar
unknown committed
494
    we can compare pointers to names here, because if name was not changed,
495 496 497 498 499 500 501 502
    pointer will be same
  */
  if (!orig_name && new_name != name)
    orig_name= name;
  name= new_name;
}


unknown's avatar
unknown committed
503
/**
504
  Traverse item tree possibly transforming it (replacing items).
505

unknown's avatar
unknown committed
506 507 508 509
  This function is designed to ease transformation of Item trees.
  Re-execution note: every such transformation is registered for
  rollback by THD::change_item_tree() and is rolled back at the end
  of execution by THD::rollback_item_tree_changes().
510

unknown's avatar
unknown committed
511 512 513 514 515 516 517
  Therefore:
  - this function can not be used at prepared statement prepare
  (in particular, in fix_fields!), as only permanent
  transformation of Item trees are allowed at prepare.
  - the transformer function shall allocate new Items in execution
  memory root (thd->mem_root) and not anywhere else: allocated
  items will be gone in the end of execution.
518

unknown's avatar
unknown committed
519 520
  If you don't need to transform an item tree, but only traverse
  it, please use Item::walk() instead.
521 522


unknown's avatar
unknown committed
523 524
  @param transformer    functor that performs transformation of a subtree
  @param arg            opaque argument passed to the functor
525

unknown's avatar
unknown committed
526
  @return
527
    Returns pointer to the new subtree root.  THD::change_item_tree()
528
    should be called for it if transformation took place, i.e. if a
529 530 531
    pointer to newly allocated item is returned.
*/

532
Item* Item::transform(Item_transformer transformer, uchar *arg)
533 534 535 536 537 538 539
{
  DBUG_ASSERT(!current_thd->is_stmt_prepare());

  return (this->*transformer)(arg);
}


540 541 542 543 544 545 546
Item_ident::Item_ident(Name_resolution_context *context_arg,
                       const char *db_name_arg,const char *table_name_arg,
		       const char *field_name_arg)
  :orig_db_name(db_name_arg), orig_table_name(table_name_arg),
   orig_field_name(field_name_arg), context(context_arg),
   db_name(db_name_arg), table_name(table_name_arg),
   field_name(field_name_arg),
547
   alias_name_used(FALSE), cached_field_index(NO_CACHED_FIELD_INDEX),
548
   cached_table(0), depended_from(0)
unknown's avatar
unknown committed
549
{
550
  name = (char*) field_name_arg;
unknown's avatar
unknown committed
551 552
}

553

unknown's avatar
unknown committed
554 555 556
/**
  Constructor used by Item_field & Item_*_ref (see Item comment)
*/
557

558 559
Item_ident::Item_ident(THD *thd, Item_ident *item)
  :Item(thd, item),
560 561 562
   orig_db_name(item->orig_db_name),
   orig_table_name(item->orig_table_name), 
   orig_field_name(item->orig_field_name),
563
   context(item->context),
564 565 566
   db_name(item->db_name),
   table_name(item->table_name),
   field_name(item->field_name),
567
   alias_name_used(item->alias_name_used),
568
   cached_field_index(item->cached_field_index),
569
   cached_table(item->cached_table),
570
   depended_from(item->depended_from)
571
{}
572

573 574
void Item_ident::cleanup()
{
unknown's avatar
unknown committed
575
  DBUG_ENTER("Item_ident::cleanup");
unknown's avatar
unknown committed
576
#ifdef CANT_BE_USED_AS_MEMORY_IS_FREED
577 578 579 580 581 582
		       db_name ? db_name : "(null)",
                       orig_db_name ? orig_db_name : "(null)",
		       table_name ? table_name : "(null)",
                       orig_table_name ? orig_table_name : "(null)",
		       field_name ? field_name : "(null)",
                       orig_field_name ? orig_field_name : "(null)"));
unknown's avatar
unknown committed
583
#endif
584
  Item::cleanup();
585 586 587
  db_name= orig_db_name; 
  table_name= orig_table_name;
  field_name= orig_field_name;
588
  depended_from= 0;
unknown's avatar
unknown committed
589
  DBUG_VOID_RETURN;
590 591
}

592
bool Item_ident::remove_dependence_processor(uchar * arg)
unknown's avatar
unknown committed
593 594 595 596
{
  DBUG_ENTER("Item_ident::remove_dependence_processor");
  if (depended_from == (st_select_lex *) arg)
    depended_from= 0;
597
  DBUG_RETURN(0);
unknown's avatar
unknown committed
598 599 600
}


unknown's avatar
unknown committed
601
/**
602 603
  Store the pointer to this item field into a list if not already there.

unknown's avatar
unknown committed
604 605
  The method is used by Item::walk to collect all unique Item_field objects
  from a tree of Items into a set of items represented as a list.
606

unknown's avatar
unknown committed
607 608 609 610
  Item_cond::walk() and Item_func::walk() stop the evaluation of the
  processor function for its arguments once the processor returns
  true.Therefore in order to force this method being called for all item
  arguments in a condition the method must return false.
611

unknown's avatar
unknown committed
612
  @param arg  pointer to a List<Item_field>
613

unknown's avatar
unknown committed
614
  @return
unknown's avatar
unknown committed
615
    FALSE to force the evaluation of collect_item_field_processor
unknown's avatar
unknown committed
616
    for the subsequent items.
617 618
*/

619
bool Item_field::collect_item_field_processor(uchar *arg)
620 621 622 623 624 625 626 627 628
{
  DBUG_ENTER("Item_field::collect_item_field_processor");
  DBUG_PRINT("info", ("%s", field->field_name ? field->field_name : "noname"));
  List<Item_field> *item_list= (List<Item_field>*) arg;
  List_iterator<Item_field> item_list_it(*item_list);
  Item_field *curr_item;
  while ((curr_item= item_list_it++))
  {
    if (curr_item->eq(this, 1))
unknown's avatar
unknown committed
629
      DBUG_RETURN(FALSE); /* Already in the set. */
630 631
  }
  item_list->push_back(this);
unknown's avatar
unknown committed
632
  DBUG_RETURN(FALSE);
633 634 635
}


unknown's avatar
unknown committed
636
/**
unknown's avatar
unknown committed
637 638
  Check if an Item_field references some field from a list of fields.

unknown's avatar
unknown committed
639 640 641 642
  Check whether the Item_field represented by 'this' references any
  of the fields in the keyparts passed via 'arg'. Used with the
  method Item::walk() to test whether any keypart in a sequence of
  keyparts is referenced in an expression.
unknown's avatar
unknown committed
643

unknown's avatar
unknown committed
644
  @param arg   Field being compared, arg must be of type Field
unknown's avatar
unknown committed
645

unknown's avatar
unknown committed
646
  @retval
unknown's avatar
unknown committed
647
    TRUE  if 'this' references the field 'arg'
unknown's avatar
unknown committed
648
  @retval
unknown's avatar
unknown committed
649
    FALSE otherwise
unknown's avatar
unknown committed
650
*/
unknown's avatar
unknown committed
651

652
bool Item_field::find_item_in_field_list_processor(uchar *arg)
unknown's avatar
unknown committed
653 654 655 656 657 658 659 660 661 662 663 664 665 666
{
  KEY_PART_INFO *first_non_group_part= *((KEY_PART_INFO **) arg);
  KEY_PART_INFO *last_part= *(((KEY_PART_INFO **) arg) + 1);
  KEY_PART_INFO *cur_part;

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


667 668 669 670 671 672 673 674
/*
  Mark field in read_map

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

675
bool Item_field::register_field_in_read_map(uchar *arg)
676 677 678 679 680 681 682 683
{
  TABLE *table= (TABLE *) arg;
  if (field->table == table || !table)
    bitmap_set_bit(field->table->read_set, field->field_index);
  return 0;
}


unknown's avatar
unknown committed
684 685 686 687
bool Item::check_cols(uint c)
{
  if (c != 1)
  {
unknown's avatar
unknown committed
688
    my_error(ER_OPERAND_COLUMNS, MYF(0), c);
unknown's avatar
unknown committed
689 690 691 692 693
    return 1;
  }
  return 0;
}

unknown's avatar
unknown committed
694 695

void Item::set_name(const char *str, uint length, CHARSET_INFO *cs)
unknown's avatar
unknown committed
696 697 698
{
  if (!length)
  {
unknown's avatar
unknown committed
699 700
    /* Empty string, used by AS or internal function like last_insert_id() */
    name= (char*) str;
701
    name_length= 0;
unknown's avatar
unknown committed
702 703
    return;
  }
704 705
  if (cs->ctype)
  {
706
    uint orig_len= length;
unknown's avatar
unknown committed
707 708 709 710
    /*
      This will probably need a better implementation in the future:
      a function in CHARSET_INFO structure.
    */
711 712 713 714 715
    while (length && !my_isgraph(cs,*str))
    {						// Fix problem with yacc
      length--;
      str++;
    }
716
    if (orig_len != length && !is_autogenerated_name)
unknown's avatar
unknown committed
717 718 719 720 721 722 723 724 725 726
    {
      if (length == 0)
        push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_NAME_BECOMES_EMPTY, ER(ER_NAME_BECOMES_EMPTY),
                            str + length - orig_len);
      else
        push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_REMOVED_SPACES, ER(ER_REMOVED_SPACES),
                            str + length - orig_len);
    }
unknown's avatar
unknown committed
727
  }
unknown's avatar
unknown committed
728 729
  if (!my_charset_same(cs, system_charset_info))
  {
730
    size_t res_length;
731
    name= sql_strmake_with_convert(str, name_length= length, cs,
unknown's avatar
unknown committed
732 733 734 735
				   MAX_ALIAS_NAME, system_charset_info,
				   &res_length);
  }
  else
736
    name= sql_strmake(str, (name_length= min(length,MAX_ALIAS_NAME)));
unknown's avatar
unknown committed
737 738
}

unknown's avatar
unknown committed
739

unknown's avatar
unknown committed
740 741
/**
  @details
742 743 744
  This function is called when:
  - Comparing items in the WHERE clause (when doing where optimization)
  - When trying to find an ORDER BY/GROUP BY item in the SELECT part
745 746 747
*/

bool Item::eq(const Item *item, bool binary_cmp) const
unknown's avatar
unknown committed
748
{
749 750 751 752 753
  /*
    Note, that this is never TRUE if item is a Item_param:
    for all basic constants we have special checks, and Item_param's
    type() can be only among basic constant types.
  */
unknown's avatar
unknown committed
754
  return type() == item->type() && name && item->name &&
755
    !my_strcasecmp(system_charset_info,name,item->name);
unknown's avatar
unknown committed
756 757
}

unknown's avatar
unknown committed
758

759 760
Item *Item::safe_charset_converter(CHARSET_INFO *tocs)
{
761 762
  Item_func_conv_charset *conv= new Item_func_conv_charset(this, tocs, 1);
  return conv->safe ? conv : NULL;
763 764 765
}


unknown's avatar
unknown committed
766 767
/**
  @details
unknown's avatar
unknown committed
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785
  Created mostly for mysql_prepare_table(). Important
  when a string ENUM/SET column is described with a numeric default value:

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

  We cannot use generic Item::safe_charset_converter(), because
  the latter returns a non-fixed Item, so val_str() crashes afterwards.
  Override Item_num method, to return a fixed item.
*/
Item *Item_num::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_string *conv;
  char buf[64];
  String *s, tmp(buf, sizeof(buf), &my_charset_bin);
  s= val_str(&tmp);
  if ((conv= new Item_string(s->ptr(), s->length(), s->charset())))
  {
    conv->str_value.copy();
786
    conv->str_value.mark_as_const();
unknown's avatar
unknown committed
787 788 789 790 791
  }
  return conv;
}


792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
Item *Item_static_float_func::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_string *conv;
  char buf[64];
  String *s, tmp(buf, sizeof(buf), &my_charset_bin);
  s= val_str(&tmp);
  if ((conv= new Item_static_string_func(func_name, s->ptr(), s->length(),
                                         s->charset())))
  {
    conv->str_value.copy();
    conv->str_value.mark_as_const();
  }
  return conv;
}


808 809 810 811
Item *Item_string::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_string *conv;
  uint conv_errors;
812
  char *ptr;
813 814 815 816 817 818 819 820 821 822 823 824 825 826
  String tmp, cstr, *ostr= val_str(&tmp);
  cstr.copy(ostr->ptr(), ostr->length(), ostr->charset(), tocs, &conv_errors);
  if (conv_errors || !(conv= new Item_string(cstr.ptr(), cstr.length(),
                                             cstr.charset(),
                                             collation.derivation)))
  {
    /*
      Safe conversion is not possible (or EOM).
      We could not convert a string into the requested character set
      without data loss. The target charset does not cover all the
      characters from the string. Operation cannot be done correctly.
    */
    return NULL;
  }
827
  if (!(ptr= current_thd->strmake(cstr.ptr(), cstr.length())))
828 829
    return NULL;
  conv->str_value.set(ptr, cstr.length(), cstr.charset());
unknown's avatar
unknown committed
830 831
  /* Ensure that no one is going to change the result string */
  conv->str_value.mark_as_const();
832 833 834 835
  return conv;
}


836 837 838 839 840
Item *Item_param::safe_charset_converter(CHARSET_INFO *tocs)
{
  if (const_item())
  {
    uint cnv_errors;
unknown's avatar
unknown committed
841 842 843 844 845 846 847 848
    String *ostr= val_str(&cnvstr);
    cnvitem->str_value.copy(ostr->ptr(), ostr->length(),
                            ostr->charset(), tocs, &cnv_errors);
    if (cnv_errors)
       return NULL;
    cnvitem->str_value.mark_as_const();
    cnvitem->max_length= cnvitem->str_value.numchars() * tocs->mbmaxlen;
    return cnvitem;
849 850 851 852 853
  }
  return NULL;
}


854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
Item *Item_static_string_func::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_string *conv;
  uint conv_errors;
  String tmp, cstr, *ostr= val_str(&tmp);
  cstr.copy(ostr->ptr(), ostr->length(), ostr->charset(), tocs, &conv_errors);
  if (conv_errors ||
      !(conv= new Item_static_string_func(func_name,
                                          cstr.ptr(), cstr.length(),
                                          cstr.charset(),
                                          collation.derivation)))
  {
    /*
      Safe conversion is not possible (or EOM).
      We could not convert a string into the requested character set
      without data loss. The target charset does not cover all the
      characters from the string. Operation cannot be done correctly.
871 872 873 874
    */
    return NULL;
  }
  conv->str_value.copy();
unknown's avatar
unknown committed
875 876
  /* Ensure that no one is going to change the result string */
  conv->str_value.mark_as_const();
877 878 879 880
  return conv;
}


881 882
bool Item_string::eq(const Item *item, bool binary_cmp) const
{
883
  if (type() == item->type() && item->basic_const_item())
884 885
  {
    if (binary_cmp)
unknown's avatar
unknown committed
886
      return !stringcmp(&str_value, &item->str_value);
unknown's avatar
unknown committed
887 888
    return (collation.collation == item->collation.collation &&
	    !sortcmp(&str_value, &item->str_value, collation.collation));
889 890 891 892 893
  }
  return 0;
}


unknown's avatar
unknown committed
894
/**
895
  Get the value of the function as a MYSQL_TIME structure.
unknown's avatar
unknown committed
896
  As a extra convenience the time structure is reset on error!
unknown's avatar
unknown committed
897
*/
unknown's avatar
unknown committed
898

899
bool Item::get_date(MYSQL_TIME *ltime,uint fuzzydate)
unknown's avatar
unknown committed
900
{
901
  if (result_type() == STRING_RESULT)
unknown's avatar
unknown committed
902
  {
903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922
    char buff[40];
    String tmp(buff,sizeof(buff), &my_charset_bin),*res;
    if (!(res=val_str(&tmp)) ||
        str_to_datetime_with_warn(res->ptr(), res->length(),
                                  ltime, fuzzydate) <= MYSQL_TIMESTAMP_ERROR)
      goto err;
  }
  else
  {
    longlong value= val_int();
    int was_cut;
    if (number_to_datetime(value, ltime, fuzzydate, &was_cut) == LL(-1))
    {
      char buff[22], *end;
      end= longlong10_to_str(value, buff, -10);
      make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                                   buff, (int) (end-buff), MYSQL_TIMESTAMP_NONE,
                                   NullS);
      goto err;
    }
unknown's avatar
unknown committed
923 924
  }
  return 0;
925 926 927 928

err:
  bzero((char*) ltime,sizeof(*ltime));
  return 1;
unknown's avatar
unknown committed
929 930
}

unknown's avatar
unknown committed
931 932 933
/**
  Get time of first argument.\

unknown's avatar
unknown committed
934
  As a extra convenience the time structure is reset on error!
unknown's avatar
unknown committed
935
*/
unknown's avatar
unknown committed
936

937
bool Item::get_time(MYSQL_TIME *ltime)
unknown's avatar
unknown committed
938 939
{
  char buff[40];
unknown's avatar
unknown committed
940
  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
unknown's avatar
unknown committed
941
  if (!(res=val_str(&tmp)) ||
942
      str_to_time_with_warn(res->ptr(), res->length(), ltime))
unknown's avatar
unknown committed
943 944 945 946 947 948 949
  {
    bzero((char*) ltime,sizeof(*ltime));
    return 1;
  }
  return 0;
}

950
CHARSET_INFO *Item::default_charset()
951
{
unknown's avatar
unknown committed
952
  return current_thd->variables.collation_connection;
953 954
}

955

956 957 958 959 960 961 962 963
/*
  Save value in field, but don't give any warnings

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

964 965 966
int Item::save_in_field_no_warnings(Field *field, bool no_conversions)
{
  int res;
967 968
  TABLE *table= field->table;
  THD *thd= table->in_use;
969
  enum_check_fields tmp= thd->count_cuted_fields;
970
  my_bitmap_map *old_map= dbug_tmp_use_all_columns(table, table->write_set);
971 972
  ulong sql_mode= thd->variables.sql_mode;
  thd->variables.sql_mode&= ~(MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE);
973 974 975
  thd->count_cuted_fields= CHECK_FIELD_IGNORE;
  res= save_in_field(field, no_conversions);
  thd->count_cuted_fields= tmp;
976
  dbug_tmp_restore_column_map(table->write_set, old_map);
977
  thd->variables.sql_mode= sql_mode;
978 979 980 981
  return res;
}


982
/*****************************************************************************
983
  Item_sp_variable methods
984
*****************************************************************************/
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017

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


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

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

  DBUG_ASSERT(it->fixed);

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

  return FALSE;
}


double Item_sp_variable::val_real()
unknown's avatar
unknown committed
1018 1019 1020 1021
{
  DBUG_ASSERT(fixed);
  Item *it= this_item();
  double ret= it->val_real();
1022
  null_value= it->null_value;
unknown's avatar
unknown committed
1023 1024 1025 1026
  return ret;
}


1027
longlong Item_sp_variable::val_int()
unknown's avatar
unknown committed
1028 1029 1030 1031
{
  DBUG_ASSERT(fixed);
  Item *it= this_item();
  longlong ret= it->val_int();
1032
  null_value= it->null_value;
unknown's avatar
unknown committed
1033 1034 1035 1036
  return ret;
}


1037
String *Item_sp_variable::val_str(String *sp)
unknown's avatar
unknown committed
1038 1039 1040
{
  DBUG_ASSERT(fixed);
  Item *it= this_item();
1041
  String *res= it->val_str(sp);
1042 1043

  null_value= it->null_value;
1044

1045 1046 1047
  if (!res)
    return NULL;

1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
  /*
    This way we mark returned value of val_str as const,
    so that various functions (e.g. CONCAT) won't try to
    modify the value of the Item. Analogous mechanism is
    implemented for Item_param.
    Without this trick Item_splocal could be changed as a
    side-effect of expression computation. Here is an example
    of what happens without it: suppose x is varchar local
    variable in a SP with initial value 'ab' Then
      select concat(x,'c');
    would change x's value to 'abc', as Item_func_concat::val_str()
    would use x's internal buffer to compute the result.
    This is intended behaviour of Item_func_concat. Comments to
    Item_param class contain some more details on the topic.
  */
1063

1064 1065 1066 1067
  if (res != &str_value)
    str_value.set(res->ptr(), res->length(), res->charset());
  else
    res->mark_as_const();
1068

1069
  return &str_value;
unknown's avatar
unknown committed
1070 1071 1072
}


1073
my_decimal *Item_sp_variable::val_decimal(my_decimal *decimal_value)
unknown's avatar
unknown committed
1074 1075 1076
{
  DBUG_ASSERT(fixed);
  Item *it= this_item();
1077
  my_decimal *val= it->val_decimal(decimal_value);
1078
  null_value= it->null_value;
unknown's avatar
unknown committed
1079 1080 1081 1082
  return val;
}


1083
bool Item_sp_variable::is_null()
unknown's avatar
unknown committed
1084
{
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
  return this_item()->is_null();
}


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

Item_splocal::Item_splocal(const LEX_STRING &sp_var_name,
                           uint sp_var_idx,
                           enum_field_types sp_var_type,
unknown's avatar
unknown committed
1096
                           uint pos_in_q, uint len_in_q)
1097
  :Item_sp_variable(sp_var_name.str, sp_var_name.length),
unknown's avatar
unknown committed
1098
   m_var_idx(sp_var_idx), pos_in_query(pos_in_q), len_in_query(len_in_q)
1099 1100 1101 1102
{
  maybe_null= TRUE;

  m_type= sp_map_item_type(sp_var_type);
1103
  m_field_type= sp_var_type;
1104
  m_result_type= sp_map_result_type(sp_var_type);
unknown's avatar
unknown committed
1105 1106 1107
}


1108 1109 1110
Item *
Item_splocal::this_item()
{
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121
  DBUG_ASSERT(m_sp == m_thd->spcont->sp);

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

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

  return m_thd->spcont->get_item(m_var_idx);
1122 1123
}

1124 1125

Item **
1126
Item_splocal::this_item_addr(THD *thd, Item **)
1127
{
1128 1129 1130
  DBUG_ASSERT(m_sp == thd->spcont->sp);

  return thd->spcont->get_item_addr(m_var_idx);
1131 1132
}

1133

1134
void Item_splocal::print(String *str, enum_query_type)
1135
{
1136 1137 1138 1139
  str->reserve(m_name.length+8);
  str->append(m_name.str, m_name.length);
  str->append('@');
  str->qs_append(m_var_idx);
1140 1141
}

1142

1143
bool Item_splocal::set_value(THD *thd, sp_rcontext *ctx, Item **it)
1144 1145 1146 1147 1148
{
  return ctx->set_variable(thd, get_var_idx(), it);
}


1149 1150 1151 1152
/*****************************************************************************
  Item_case_expr methods
*****************************************************************************/

1153
Item_case_expr::Item_case_expr(uint case_expr_id)
unknown's avatar
unknown committed
1154
  :Item_sp_variable( C_STRING_WITH_LEN("case_expr")),
1155
   m_case_expr_id(case_expr_id)
1156 1157 1158 1159
{
}


1160 1161
Item *
Item_case_expr::this_item()
unknown's avatar
unknown committed
1162
{
1163 1164 1165
  DBUG_ASSERT(m_sp == m_thd->spcont->sp);

  return m_thd->spcont->get_case_expr(m_case_expr_id);
unknown's avatar
unknown committed
1166 1167 1168
}


1169 1170 1171

const Item *
Item_case_expr::this_item() const
unknown's avatar
unknown committed
1172
{
1173 1174 1175
  DBUG_ASSERT(m_sp == m_thd->spcont->sp);

  return m_thd->spcont->get_case_expr(m_case_expr_id);
unknown's avatar
unknown committed
1176 1177 1178
}


1179 1180
Item **
Item_case_expr::this_item_addr(THD *thd, Item **)
unknown's avatar
unknown committed
1181
{
1182 1183 1184 1185 1186 1187
  DBUG_ASSERT(m_sp == thd->spcont->sp);

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


1188
void Item_case_expr::print(String *str, enum_query_type)
1189
{
1190 1191
  if (str->reserve(MAX_INT_WIDTH + sizeof("case_expr@")))
    return;                                    /* purecov: inspected */
unknown's avatar
unknown committed
1192
  VOID(str->append(STRING_WITH_LEN("case_expr@")));
1193
  str->qs_append(m_case_expr_id);
unknown's avatar
unknown committed
1194 1195 1196
}


1197 1198 1199
/*****************************************************************************
  Item_name_const methods
*****************************************************************************/
1200

1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
double Item_name_const::val_real()
{
  DBUG_ASSERT(fixed);
  double ret= value_item->val_real();
  null_value= value_item->null_value;
  return ret;
}


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


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


my_decimal *Item_name_const::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed);
  my_decimal *val= value_item->val_decimal(decimal_value);
1232
  null_value= value_item->null_value;
1233 1234 1235 1236 1237 1238
  return val;
}


bool Item_name_const::is_null()
{
1239
  return value_item->is_null();
1240 1241
}

1242 1243 1244 1245 1246 1247 1248

Item_name_const::Item_name_const(Item *name_arg, Item *val):
    value_item(val), name_item(name_arg)
{
  if (!(valid_args= name_item->basic_const_item() &&
                    (value_item->basic_const_item() ||
                     ((value_item->type() == FUNC_ITEM) &&
1249 1250 1251 1252
                      ((((Item_func *) value_item)->functype() ==
                         Item_func::COLLATE_FUNC) ||
                      ((((Item_func *) value_item)->functype() ==
                         Item_func::NEG_FUNC) &&
1253
                      (((Item_func *) value_item)->key_item()->type() !=
1254
                         FUNC_ITEM)))))))
1255 1256 1257 1258 1259
    my_error(ER_WRONG_ARGUMENTS, MYF(0), "NAME_CONST");
  Item::maybe_null= TRUE;
}


1260 1261
Item::Type Item_name_const::type() const
{
1262 1263 1264 1265 1266 1267 1268 1269 1270
  /*
    As 
    1. one can try to create the Item_name_const passing non-constant 
    arguments, although it's incorrect and 
    2. the type() method can be called before the fix_fields() to get
    type information for a further type cast, e.g. 
    if (item->type() == FIELD_ITEM) 
      ((Item_field *) item)->... 
    we return NULL_ITEM in the case to avoid wrong casting.
1271 1272 1273 1274

    valid_args guarantees value_item->basic_const_item(); if type is
    FUNC_ITEM, then we have a fudged item_func_neg() on our hands
    and return the underlying type.
1275 1276 1277
    For Item_func_set_collation()
    e.g. NAME_CONST('name', 'value' COLLATE collation) we return its
    'value' argument type. 
1278
  */
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
  if (!valid_args)
    return NULL_ITEM;
  Item::Type value_type= value_item->type();
  if (value_type == FUNC_ITEM)
  {
    /* 
      The second argument of NAME_CONST('name', 'value') must be 
      a simple constant item or a NEG_FUNC/COLLATE_FUNC.
    */
    DBUG_ASSERT(((Item_func *) value_item)->functype() == 
                Item_func::NEG_FUNC ||
                ((Item_func *) value_item)->functype() == 
                Item_func::COLLATE_FUNC);
    return ((Item_func *) value_item)->key_item()->type();            
  }
  return value_type;
1295 1296 1297
}


1298
bool Item_name_const::fix_fields(THD *thd, Item **ref)
1299 1300 1301 1302 1303 1304 1305
{
  char buf[128];
  String *item_name;
  String s(buf, sizeof(buf), &my_charset_bin);
  s.length(0);

  if (value_item->fix_fields(thd, &value_item) ||
unknown's avatar
unknown committed
1306 1307 1308 1309 1310 1311
      name_item->fix_fields(thd, &name_item) ||
      !value_item->const_item() ||
      !name_item->const_item() ||
      !(item_name= name_item->val_str(&s))) // Can't have a NULL name 
  {
    my_error(ER_RESERVED_SYNTAX, MYF(0), "NAME_CONST");
1312
    return TRUE;
unknown's avatar
unknown committed
1313
  }
1314
  set_name(item_name->ptr(), (uint) item_name->length(), system_charset_info);
1315
  collation.set(value_item->collation.collation, DERIVATION_IMPLICIT);
1316 1317 1318 1319 1320 1321 1322
  max_length= value_item->max_length;
  decimals= value_item->decimals;
  fixed= 1;
  return FALSE;
}


1323
void Item_name_const::print(String *str, enum_query_type query_type)
1324
{
1325
  str->append(STRING_WITH_LEN("NAME_CONST("));
1326
  name_item->print(str, query_type);
1327
  str->append(',');
1328
  value_item->print(str, query_type);
1329 1330 1331
  str->append(')');
}

1332

1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
/*
 need a special class to adjust printing : references to aggregate functions 
 must not be printed as refs because the aggregate functions that are added to
 the front of select list are not printed as well.
*/
class Item_aggregate_ref : public Item_ref
{
public:
  Item_aggregate_ref(Name_resolution_context *context_arg, Item **item,
                  const char *table_name_arg, const char *field_name_arg)
    :Item_ref(context_arg, item, table_name_arg, field_name_arg) {}

1345
  virtual inline void print (String *str, enum_query_type query_type)
1346 1347
  {
    if (ref)
1348
      (*ref)->print(str, query_type);
1349
    else
1350
      Item_ident::print(str, query_type);
1351
  }
1352
  virtual Ref_Type ref_type() { return AGGREGATE_REF; }
1353 1354 1355
};


unknown's avatar
unknown committed
1356 1357
/**
  Move SUM items out from item tree and replace with reference.
1358

unknown's avatar
unknown committed
1359 1360 1361 1362 1363 1364
  @param thd			Thread handler
  @param ref_pointer_array	Pointer to array of reference fields
  @param fields		All fields in select
  @param ref			Pointer to item
  @param skip_registered       <=> function be must skipped for registered
                               SUM items
1365

unknown's avatar
unknown committed
1366 1367
  @note
    This is from split_sum_func2() for items that should be split
1368

unknown's avatar
unknown committed
1369 1370
    All found SUM items are added FIRST in the fields list and
    we replace the item with a reference.
1371

unknown's avatar
unknown committed
1372
    thd->fatal_error() may be called if we are out of memory
1373 1374 1375
*/

void Item::split_sum_func2(THD *thd, Item **ref_pointer_array,
unknown's avatar
unknown committed
1376 1377
                           List<Item> &fields, Item **ref, 
                           bool skip_registered)
1378
{
unknown's avatar
unknown committed
1379 1380 1381 1382
  /* An item of type Item_sum  is registered <=> ref_by != 0 */ 
  if (type() == SUM_FUNC_ITEM && skip_registered && 
      ((Item_sum *) this)->ref_by)
    return;                                                 
unknown's avatar
unknown committed
1383 1384 1385 1386
  if ((type() != SUM_FUNC_ITEM && with_sum_func) ||
      (type() == FUNC_ITEM &&
       (((Item_func *) this)->functype() == Item_func::ISNOTNULLTEST_FUNC ||
        ((Item_func *) this)->functype() == Item_func::TRIG_COND_FUNC)))
1387 1388 1389 1390
  {
    /* Will split complicated items and ignore simple ones */
    split_sum_func(thd, ref_pointer_array, fields);
  }
1391
  else if ((type() == SUM_FUNC_ITEM || (used_tables() & ~PARAM_TABLE_BIT)) &&
1392
           type() != SUBSELECT_ITEM &&
1393 1394
           (type() != REF_ITEM ||
           ((Item_ref*)this)->ref_type() == Item_ref::VIEW_REF))
1395 1396 1397 1398 1399 1400 1401 1402
  {
    /*
      Replace item with a reference so that we can easily calculate
      it (in case of sum functions) or copy it (in case of fields)

      The test above is to ensure we don't do a reference for things
      that are constants (PARAM_TABLE_BIT is in effect a constant)
      or already referenced (for example an item in HAVING)
1403 1404
      Exception is Item_direct_view_ref which we need to convert to
      Item_ref to allow fields from view being stored in tmp table.
1405
    */
1406
    Item_aggregate_ref *item_ref;
1407
    uint el= fields.elements;
1408
    Item *real_itm= real_item();
1409

unknown's avatar
unknown committed
1410
    ref_pointer_array[el]= real_itm;
1411
    if (!(item_ref= new Item_aggregate_ref(&thd->lex->current_select->context,
1412
                                           ref_pointer_array + el, 0, name)))
1413
      return;                                   // fatal_error is set
1414 1415
    if (type() == SUM_FUNC_ITEM)
      item_ref->depended_from= ((Item_sum *) this)->depended_from(); 
unknown's avatar
unknown committed
1416
    fields.push_front(real_itm);
1417
    thd->change_item_tree(ref, item_ref);
1418 1419 1420 1421
  }
}


1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440
static bool
left_is_superset(DTCollation *left, DTCollation *right)
{
  /* Allow convert to Unicode */
  if (left->collation->state & MY_CS_UNICODE &&
      (left->derivation < right->derivation ||
       (left->derivation == right->derivation &&
        !(right->collation->state & MY_CS_UNICODE))))
    return TRUE;
  /* Allow convert from ASCII */
  if (right->repertoire == MY_REPERTOIRE_ASCII &&
      (left->derivation < right->derivation ||
       (left->derivation == right->derivation &&
        !(left->repertoire == MY_REPERTOIRE_ASCII))))
    return TRUE;
  /* Disallow conversion otherwise */
  return FALSE;
}

unknown's avatar
unknown committed
1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
/**
  Aggregate two collations together taking
  into account their coercibility (aka derivation):.

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

  The most important rules are:
  -# If collations are the same:
  chose this collation, and the strongest derivation.
  -# If collations are different:
  - Character sets may differ, but only if conversion without
  data loss is possible. The caller provides flags whether
  character set conversion attempts should be done. If no
  flags are substituted, then the character sets must be the same.
  Currently processed flags are:
  MY_COLL_ALLOW_SUPERSET_CONV  - allow conversion to a superset
  MY_COLL_ALLOW_COERCIBLE_CONV - allow conversion of a coercible value
  - two EXPLICIT collations produce an error, e.g. this is wrong:
  CONCAT(expr1 collate latin1_swedish_ci, expr2 collate latin1_german_ci)
  - the side with smaller derivation value wins,
  i.e. a column is stronger than a string constant,
  an explicit COLLATE clause is stronger than a column.
  - if derivations are the same, we have DERIVATION_NONE,
  we'll wait for an explicit COLLATE clause which possibly can
  come from another argument later: for example, this is valid,
  but we don't know yet when collecting the first two arguments:
     @code
       CONCAT(latin1_swedish_ci_column,
              latin1_german1_ci_column,
              expr COLLATE latin1_german2_ci)
  @endcode
1475
*/
unknown's avatar
unknown committed
1476

1477
bool DTCollation::aggregate(DTCollation &dt, uint flags)
1478
{
1479
  if (!my_charset_same(collation, dt.collation))
1480
  {
1481 1482 1483
    /* 
       We do allow to use binary strings (like BLOBS)
       together with character strings.
unknown's avatar
unknown committed
1484
       Binaries have more precedence than a character
unknown's avatar
unknown committed
1485
       string of the same derivation.
1486
    */
1487
    if (collation == &my_charset_bin)
1488
    {
1489
      if (derivation <= dt.derivation)
1490 1491 1492
      {
	/* Do nothing */
      }
1493
      else
1494 1495 1496
      {
	set(dt); 
      }
1497
    }
1498
    else if (dt.collation == &my_charset_bin)
1499
    {
1500
      if (dt.derivation <= derivation)
1501
      {
1502
        set(dt);
1503
      }
1504
    }
1505
    else if ((flags & MY_COLL_ALLOW_SUPERSET_CONV) &&
1506
             left_is_superset(this, &dt))
1507
    {
1508
      /* Do nothing */
1509 1510
    }
    else if ((flags & MY_COLL_ALLOW_SUPERSET_CONV) &&
1511
             left_is_superset(&dt, this))
1512 1513 1514 1515 1516
    {
      set(dt);
    }
    else if ((flags & MY_COLL_ALLOW_COERCIBLE_CONV) &&
             derivation < dt.derivation &&
1517
             dt.derivation >= DERIVATION_SYSCONST)
1518
    {
1519
      /* Do nothing */
1520 1521 1522
    }
    else if ((flags & MY_COLL_ALLOW_COERCIBLE_CONV) &&
             dt.derivation < derivation &&
1523
             derivation >= DERIVATION_SYSCONST)
1524 1525
    {
      set(dt);
1526
    }
1527 1528
    else
    {
1529
      // Cannot apply conversion
1530 1531
      set(&my_charset_bin, DERIVATION_NONE,
          (dt.repertoire|repertoire));
1532
      return 1;
1533
    }
1534
  }
1535
  else if (derivation < dt.derivation)
1536
  {
1537
    /* Do nothing */
1538
  }
1539
  else if (dt.derivation < derivation)
1540
  {
1541
    set(dt);
1542
  }
1543 1544 1545
  else
  { 
    if (collation == dt.collation)
1546
    {
1547
      /* Do nothing */
1548 1549 1550 1551
    }
    else 
    {
      if (derivation == DERIVATION_EXPLICIT)
1552
      {
1553 1554
        set(0, DERIVATION_NONE, 0);
        return 1;
1555
      }
1556 1557
      if (collation->state & MY_CS_BINSORT)
        return 0;
unknown's avatar
unknown committed
1558
      if (dt.collation->state & MY_CS_BINSORT)
1559 1560 1561 1562
      {
        set(dt);
        return 0;
      }
1563
      CHARSET_INFO *bin= get_charset_by_csname(collation->csname, 
1564
                                               MY_CS_BINSORT,MYF(0));
1565
      set(bin, DERIVATION_NONE);
1566
    }
1567
  }
1568
  repertoire|= dt.repertoire;
1569 1570 1571
  return 0;
}

1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
/******************************/
static
void my_coll_agg_error(DTCollation &c1, DTCollation &c2, const char *fname)
{
  my_error(ER_CANT_AGGREGATE_2COLLATIONS,MYF(0),
           c1.collation->name,c1.derivation_name(),
           c2.collation->name,c2.derivation_name(),
           fname);
}


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


static
1596 1597
void my_coll_agg_error(Item** args, uint count, const char *fname,
                       int item_sep)
1598 1599
{
  if (count == 2)
1600
    my_coll_agg_error(args[0]->collation, args[item_sep]->collation, fname);
1601
  else if (count == 3)
1602 1603
    my_coll_agg_error(args[0]->collation, args[item_sep]->collation,
                      args[2*item_sep]->collation, fname);
1604 1605 1606 1607 1608 1609
  else
    my_error(ER_CANT_AGGREGATE_NCOLLATIONS,MYF(0),fname);
}


bool agg_item_collations(DTCollation &c, const char *fname,
1610
                         Item **av, uint count, uint flags, int item_sep)
1611 1612
{
  uint i;
1613
  Item **arg;
1614 1615
  bool unknown_cs= 0;

1616
  c.set(av[0]->collation);
1617
  for (i= 1, arg= &av[item_sep]; i < count; i++, arg++)
1618
  {
1619
    if (c.aggregate((*arg)->collation, flags))
1620
    {
1621 1622 1623 1624 1625 1626
      if (c.derivation == DERIVATION_NONE &&
          c.collation == &my_charset_bin)
      {
        unknown_cs= 1;
        continue;
      }
1627
      my_coll_agg_error(av, count, fname, item_sep);
1628 1629 1630
      return TRUE;
    }
  }
1631 1632 1633 1634 1635 1636 1637 1638

  if (unknown_cs &&
      c.derivation != DERIVATION_EXPLICIT)
  {
    my_coll_agg_error(av, count, fname, item_sep);
    return TRUE;
  }

1639 1640 1641
  if ((flags & MY_COLL_DISALLOW_NONE) &&
      c.derivation == DERIVATION_NONE)
  {
1642
    my_coll_agg_error(av, count, fname, item_sep);
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652
    return TRUE;
  }
  return FALSE;
}


bool agg_item_collations_for_comparison(DTCollation &c, const char *fname,
                                        Item **av, uint count, uint flags)
{
  return (agg_item_collations(c, fname, av, count,
1653
                              flags | MY_COLL_DISALLOW_NONE, 1));
1654 1655 1656
}


1657 1658
bool agg_item_set_converter(DTCollation &coll, const char *fname,
                            Item **args, uint nargs, uint flags, int item_sep)
1659
{
1660
  Item **arg, *safe_args[2];
1661

1662 1663 1664 1665 1666 1667 1668
  /*
    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.
  */
unknown's avatar
unknown committed
1669 1670
  LINT_INIT(safe_args[0]);
  LINT_INIT(safe_args[1]);
1671 1672 1673
  if (nargs >=2 && nargs <= 3)
  {
    safe_args[0]= args[0];
1674
    safe_args[1]= args[item_sep];
1675 1676 1677
  }

  THD *thd= current_thd;
1678
  Query_arena *arena, backup;
1679
  bool res= FALSE;
1680
  uint i;
1681 1682 1683 1684
  /*
    In case we're in statement prepare, create conversion item
    in its memory: it will be reused on each execute.
  */
1685 1686
  arena= thd->is_stmt_prepare() ? thd->activate_stmt_arena_if_needed(&backup)
                                : NULL;
1687

1688
  for (i= 0, arg= args; i < nargs; i++, arg+= item_sep)
1689 1690 1691
  {
    Item* conv;
    uint32 dummy_offset;
1692 1693
    if (!String::needs_conversion(0, (*arg)->collation.collation,
                                  coll.collation,
1694 1695 1696
                                  &dummy_offset))
      continue;

1697 1698 1699 1700 1701
    if (!(conv= (*arg)->safe_charset_converter(coll.collation)) &&
        ((*arg)->collation.repertoire == MY_REPERTOIRE_ASCII))
      conv= new Item_func_conv_charset(*arg, coll.collation, 1);

    if (!conv)
1702 1703 1704 1705 1706
    {
      if (nargs >=2 && nargs <= 3)
      {
        /* restore the original arguments for better error message */
        args[0]= safe_args[0];
1707
        args[item_sep]= safe_args[1];
1708
      }
1709
      my_coll_agg_error(args, nargs, fname, item_sep);
1710 1711 1712
      res= TRUE;
      break; // we cannot return here, we need to restore "arena".
    }
1713 1714
    if ((*arg)->type() == Item::FIELD_ITEM)
      ((Item_field *)(*arg))->no_const_subst= 1;
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724
    /*
      If in statement prepare, then we create a converter for two
      constant items, do it once and then reuse it.
      If we're in execution of a prepared statement, arena is NULL,
      and the conv was created in runtime memory. This can be
      the case only if the argument is a parameter marker ('?'),
      because for all true constants the charset converter has already
      been created in prepare. In this case register the change for
      rollback.
    */
1725
    if (thd->is_stmt_prepare())
1726 1727 1728
      *arg= conv;
    else
      thd->change_item_tree(arg, conv);
1729 1730 1731 1732 1733
    /*
      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
    */
    conv->fix_fields(thd, arg);
1734 1735
  }
  if (arena)
unknown's avatar
unknown committed
1736
    thd->restore_active_arena(arena, &backup);
1737 1738 1739 1740
  return res;
}


1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
/* 
  Collect arguments' character sets together.
  We allow to apply automatic character set conversion in some cases.
  The conditions when conversion is possible are:
  - arguments A and B have different charsets
  - A wins according to coercibility rules
    (i.e. a column is stronger than a string constant,
     an explicit COLLATE clause is stronger than a column)
  - character set of A is either superset for character set of B,
    or B is a string constant which can be converted into the
    character set of A without data loss.
    
  If all of the above is true, then it's possible to convert
  B into the character set of A, and then compare according
  to the collation of A.
  
  For functions with more than two arguments:

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

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

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

*/

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

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


1781 1782 1783 1784 1785 1786 1787 1788 1789 1790
void Item_ident_for_show::make_field(Send_field *tmp_field)
{
  tmp_field->table_name= tmp_field->org_table_name= table_name;
  tmp_field->db_name= db_name;
  tmp_field->col_name= tmp_field->org_col_name= field->field_name;
  tmp_field->charsetnr= field->charset()->number;
  tmp_field->length=field->field_length;
  tmp_field->type=field->type();
  tmp_field->flags= field->table->maybe_null ? 
    (field->flags & ~NOT_NULL_FLAG) : field->flags;
1791
  tmp_field->decimals= field->decimals();
1792
}
1793 1794 1795

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

unknown's avatar
unknown committed
1796
Item_field::Item_field(Field *f)
1797
  :Item_ident(0, NullS, *f->table_name, f->field_name),
unknown's avatar
unknown committed
1798
   item_equal(0), no_const_subst(0),
1799
   have_privileges(0), any_privileges(0)
unknown's avatar
unknown committed
1800 1801
{
  set_field(f);
1802
  /*
unknown's avatar
unknown committed
1803
    field_name and table_name should not point to garbage
1804 1805 1806
    if this item is to be reused
  */
  orig_table_name= orig_field_name= "";
unknown's avatar
unknown committed
1807 1808
}

unknown's avatar
unknown committed
1809

unknown's avatar
unknown committed
1810 1811 1812 1813 1814 1815 1816
/**
  Constructor used inside setup_wild().

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

1817 1818
Item_field::Item_field(THD *thd, Name_resolution_context *context_arg,
                       Field *f)
unknown's avatar
unknown committed
1819
  :Item_ident(context_arg, f->table->s->db.str, *f->table_name, f->field_name),
unknown's avatar
unknown committed
1820
   item_equal(0), no_const_subst(0),
1821
   have_privileges(0), any_privileges(0)
unknown's avatar
unknown committed
1822
{
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
  /*
    We always need to provide Item_field with a fully qualified field
    name to avoid ambiguity when executing prepared statements like
    SELECT * from d1.t1, d2.t1; (assuming d1.t1 and d2.t1 have columns
    with same names).
    This is because prepared statements never deal with wildcards in
    select list ('*') and always fix fields using fully specified path
    (i.e. db.table.column).
    No check for OOM: if db_name is NULL, we'll just get
    "Field not found" error.
    We need to copy db_name, table_name and field_name because they must
    be allocated in the statement memory, not in table memory (the table
    structure can go away and pop up again between subsequent executions
1836
    of a prepared statement or after the close_tables_for_reopen() call
1837 1838
    in mysql_multi_update_prepare() or due to wildcard expansion in stored
    procedures).
1839 1840 1841 1842
  */
  {
    if (db_name)
      orig_db_name= thd->strdup(db_name);
1843 1844 1845 1846
    if (table_name)
      orig_table_name= thd->strdup(table_name);
    if (field_name)
      orig_field_name= thd->strdup(field_name);
1847 1848 1849 1850 1851 1852 1853
    /*
      We don't restore 'name' in cleanup because it's not changed
      during execution. Still we need it to point to persistent
      memory if this item is to be reused.
    */
    name= (char*) orig_field_name;
  }
unknown's avatar
unknown committed
1854 1855 1856
  set_field(f);
}

1857 1858 1859 1860 1861 1862

Item_field::Item_field(Name_resolution_context *context_arg,
                       const char *db_arg,const char *table_name_arg,
                       const char *field_name_arg)
  :Item_ident(context_arg, db_arg,table_name_arg,field_name_arg),
   field(0), result_field(0), item_equal(0), no_const_subst(0),
1863
   have_privileges(0), any_privileges(0)
1864
{
unknown's avatar
unknown committed
1865
  SELECT_LEX *select= current_thd->lex->current_select;
1866
  collation.set(DERIVATION_IMPLICIT);
unknown's avatar
unknown committed
1867 1868
  if (select && select->parsing_place != IN_HAVING)
      select->select_n_where_fields++;
1869 1870
}

unknown's avatar
unknown committed
1871 1872 1873 1874
/**
  Constructor need to process subselect with temporary tables (see Item)
*/

1875
Item_field::Item_field(THD *thd, Item_field *item)
1876
  :Item_ident(thd, item),
1877
   field(item->field),
unknown's avatar
VIEW  
unknown committed
1878
   result_field(item->result_field),
unknown's avatar
unknown committed
1879 1880
   item_equal(item->item_equal),
   no_const_subst(item->no_const_subst),
unknown's avatar
VIEW  
unknown committed
1881
   have_privileges(item->have_privileges),
1882
   any_privileges(item->any_privileges)
1883 1884 1885
{
  collation.set(DERIVATION_IMPLICIT);
}
unknown's avatar
unknown committed
1886 1887 1888 1889 1890 1891

void Item_field::set_field(Field *field_par)
{
  field=result_field=field_par;			// for easy coding with fields
  maybe_null=field->maybe_null();
  decimals= field->decimals();
1892
  max_length= field_par->max_display_length();
1893 1894
  table_name= *field_par->table_name;
  field_name= field_par->field_name;
unknown's avatar
unknown committed
1895
  db_name= field_par->table->s->db.str;
unknown's avatar
unknown committed
1896
  alias_name_used= field_par->table->alias_name_used;
1897
  unsigned_flag=test(field_par->flags & UNSIGNED_FLAG);
1898
  collation.set(field_par->charset(), field_par->derivation());
1899
  fixed= 1;
unknown's avatar
unknown committed
1900 1901
  if (field->table->s->tmp_table == SYSTEM_TMP_TABLE)
    any_privileges= 0;
1902 1903 1904
}


unknown's avatar
unknown committed
1905
/**
1906 1907 1908 1909 1910 1911 1912 1913 1914 1915
  Reset this item to point to a field from the new temporary table.
  This is used when we create a new temporary table for each execution
  of prepared statement.
*/

void Item_field::reset_field(Field *f)
{
  set_field(f);
  /* 'name' is pointing at field->field_name of old field */
  name= (char*) f->field_name;
unknown's avatar
unknown committed
1916 1917
}

Sergey Petrunia's avatar
Sergey Petrunia committed
1918

Sergey Petrunia's avatar
Sergey Petrunia committed
1919 1920 1921
bool Item_field::check_column_usage_processor(uchar *arg)
{
  Field_processor_info* info=(Field_processor_info*)arg;
Sergey Petrunia's avatar
Sergey Petrunia committed
1922 1923

  /* It is ok if this is a column of an allowed table: */
Sergey Petrunia's avatar
Sergey Petrunia committed
1924 1925 1926 1927 1928
  if (used_tables() & ~info->allowed_tables)
    return FALSE;

  if (field->table == info->table)
  {
Sergey Petrunia's avatar
Sergey Petrunia committed
1929
    /* It is not ok to use columns that are not part of the key of interest: */
Sergey Petrunia's avatar
Sergey Petrunia committed
1930 1931 1932
    if (!(field->part_of_key.is_set(info->keyno)))
       return TRUE;

Sergey Petrunia's avatar
Sergey Petrunia committed
1933
    /* Find which key part we're using and mark it in needed_key_parts */
Sergey Petrunia's avatar
Sergey Petrunia committed
1934 1935 1936 1937 1938 1939 1940 1941 1942
    KEY *key= &field->table->key_info[info->keyno];
    for (uint part= 0; part < key->key_parts; part++)
    {
      if (field->field_index == key->key_part[part].field->field_index)
      {
        info->needed_key_parts |= key_part_map(1) << part;
        break;
      }
    }
Sergey Petrunia's avatar
Sergey Petrunia committed
1943
    return FALSE;
Sergey Petrunia's avatar
Sergey Petrunia committed
1944
  }
Sergey Petrunia's avatar
Sergey Petrunia committed
1945 1946 1947 1948 1949

  /* 
    We get here when this refers to a table that's neither the table of
    interest, nor one of the allowed tables. 
  */
Sergey Petrunia's avatar
Sergey Petrunia committed
1950
  return TRUE;
Sergey Petrunia's avatar
Sergey Petrunia committed
1951 1952
}

Sergey Petrunia's avatar
Sergey Petrunia committed
1953

unknown's avatar
unknown committed
1954 1955 1956
const char *Item_ident::full_name() const
{
  char *tmp;
1957
  if (!table_name || !field_name)
unknown's avatar
unknown committed
1958
    return field_name ? field_name : name ? name : "tmp_field";
unknown's avatar
unknown committed
1959
  if (db_name && db_name[0])
unknown's avatar
unknown committed
1960
  {
unknown's avatar
unknown committed
1961 1962
    tmp=(char*) sql_alloc((uint) strlen(db_name)+(uint) strlen(table_name)+
			  (uint) strlen(field_name)+3);
unknown's avatar
unknown committed
1963 1964 1965 1966
    strxmov(tmp,db_name,".",table_name,".",field_name,NullS);
  }
  else
  {
1967 1968 1969 1970 1971 1972 1973 1974
    if (table_name[0])
    {
      tmp= (char*) sql_alloc((uint) strlen(table_name) +
			     (uint) strlen(field_name) + 2);
      strxmov(tmp, table_name, ".", field_name, NullS);
    }
    else
      tmp= (char*) field_name;
unknown's avatar
unknown committed
1975 1976 1977 1978
  }
  return tmp;
}

1979
void Item_ident::print(String *str, enum_query_type query_type)
1980
{
1981
  THD *thd= current_thd;
1982 1983
  char d_name_buff[MAX_ALIAS_NAME], t_name_buff[MAX_ALIAS_NAME];
  const char *d_name= db_name, *t_name= table_name;
unknown's avatar
unknown committed
1984 1985
  if (lower_case_table_names== 1 ||
      (lower_case_table_names == 2 && !alias_name_used))
1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
  {
    if (table_name && table_name[0])
    {
      strmov(t_name_buff, table_name);
      my_casedn_str(files_charset_info, t_name_buff);
      t_name= t_name_buff;
    }
    if (db_name && db_name[0])
    {
      strmov(d_name_buff, db_name);
      my_casedn_str(files_charset_info, d_name_buff);
      d_name= d_name_buff;
    }
  }

2001
  if (!table_name || !field_name || !field_name[0])
2002
  {
2003 2004
    const char *nm= (field_name && field_name[0]) ?
                      field_name : name ? name : "tmp_field";
2005
    append_identifier(thd, str, nm, (uint) strlen(nm));
2006 2007
    return;
  }
unknown's avatar
unknown committed
2008
  if (db_name && db_name[0] && !alias_name_used)
2009
  {
2010 2011 2012
    if (!(cached_table && cached_table->belong_to_view &&
          cached_table->belong_to_view->compact_view_format))
    {
2013
      append_identifier(thd, str, d_name, (uint)strlen(d_name));
2014 2015
      str->append('.');
    }
2016
    append_identifier(thd, str, t_name, (uint)strlen(t_name));
2017
    str->append('.');
2018
    append_identifier(thd, str, field_name, (uint)strlen(field_name));
2019 2020 2021 2022 2023
  }
  else
  {
    if (table_name[0])
    {
2024
      append_identifier(thd, str, t_name, (uint) strlen(t_name));
2025
      str->append('.');
2026
      append_identifier(thd, str, field_name, (uint) strlen(field_name));
2027 2028
    }
    else
2029
      append_identifier(thd, str, field_name, (uint) strlen(field_name));
2030 2031 2032
  }
}

unknown's avatar
unknown committed
2033 2034 2035
/* ARGSUSED */
String *Item_field::val_str(String *str)
{
2036
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2037 2038
  if ((null_value=field->is_null()))
    return 0;
2039
  str->set_charset(str_value.charset());
unknown's avatar
unknown committed
2040 2041 2042
  return field->val_str(str,&str_value);
}

unknown's avatar
unknown committed
2043

2044
double Item_field::val_real()
unknown's avatar
unknown committed
2045
{
2046
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2047 2048 2049 2050 2051
  if ((null_value=field->is_null()))
    return 0.0;
  return field->val_real();
}

unknown's avatar
unknown committed
2052

unknown's avatar
unknown committed
2053 2054
longlong Item_field::val_int()
{
2055
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2056 2057 2058 2059 2060 2061
  if ((null_value=field->is_null()))
    return 0;
  return field->val_int();
}


unknown's avatar
unknown committed
2062 2063 2064 2065 2066 2067 2068 2069
my_decimal *Item_field::val_decimal(my_decimal *decimal_value)
{
  if ((null_value= field->is_null()))
    return 0;
  return field->val_decimal(decimal_value);
}


unknown's avatar
unknown committed
2070 2071 2072 2073
String *Item_field::str_result(String *str)
{
  if ((null_value=result_field->is_null()))
    return 0;
2074
  str->set_charset(str_value.charset());
unknown's avatar
unknown committed
2075 2076 2077
  return result_field->val_str(str,&str_value);
}

2078
bool Item_field::get_date(MYSQL_TIME *ltime,uint fuzzydate)
unknown's avatar
unknown committed
2079 2080 2081 2082 2083 2084 2085 2086 2087
{
  if ((null_value=field->is_null()) || field->get_date(ltime,fuzzydate))
  {
    bzero((char*) ltime,sizeof(*ltime));
    return 1;
  }
  return 0;
}

2088
bool Item_field::get_date_result(MYSQL_TIME *ltime,uint fuzzydate)
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098
{
  if ((null_value=result_field->is_null()) ||
      result_field->get_date(ltime,fuzzydate))
  {
    bzero((char*) ltime,sizeof(*ltime));
    return 1;
  }
  return 0;
}

2099
bool Item_field::get_time(MYSQL_TIME *ltime)
unknown's avatar
unknown committed
2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122
{
  if ((null_value=field->is_null()) || field->get_time(ltime))
  {
    bzero((char*) ltime,sizeof(*ltime));
    return 1;
  }
  return 0;
}

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

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

2123

unknown's avatar
unknown committed
2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135
my_decimal *Item_field::val_decimal_result(my_decimal *decimal_value)
{
  if ((null_value= result_field->is_null()))
    return 0;
  return result_field->val_decimal(decimal_value);
}


bool Item_field::val_bool_result()
{
  if ((null_value= result_field->is_null()))
    return FALSE;
2136
  switch (result_field->result_type()) {
unknown's avatar
unknown committed
2137
  case INT_RESULT:
2138
    return result_field->val_int() != 0;
unknown's avatar
unknown committed
2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152
  case DECIMAL_RESULT:
  {
    my_decimal decimal_value;
    my_decimal *val= result_field->val_decimal(&decimal_value);
    if (val)
      return !my_decimal_is_zero(val);
    return 0;
  }
  case REAL_RESULT:
  case STRING_RESULT:
    return result_field->val_real() != 0.0;
  case ROW_RESULT:
  default:
    DBUG_ASSERT(0);
2153
    return 0;                                   // Shut up compiler
unknown's avatar
unknown committed
2154 2155 2156 2157
  }
}


2158 2159 2160 2161 2162 2163
bool Item_field::is_null_result()
{
  return (null_value=result_field->is_null());
}


2164
bool Item_field::eq(const Item *item, bool binary_cmp) const
unknown's avatar
unknown committed
2165
{
2166 2167
  Item *real_item= ((Item *) item)->real_item();
  if (real_item->type() != FIELD_ITEM)
2168 2169
    return 0;
  
2170
  Item_field *item_field= (Item_field*) real_item;
unknown's avatar
unknown committed
2171
  if (item_field->field && field)
2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184
    return item_field->field == field;
  /*
    We may come here when we are trying to find a function in a GROUP BY
    clause from the select list.
    In this case the '100 % correct' way to do this would be to first
    run fix_fields() on the GROUP BY item and then retry this function, but
    I think it's better to relax the checking a bit as we will in
    most cases do the correct thing by just checking the field name.
    (In cases where we would choose wrong we would have to generate a
    ER_NON_UNIQ_ERROR).
  */
  return (!my_strcasecmp(system_charset_info, item_field->name,
			 field_name) &&
unknown's avatar
unknown committed
2185
	  (!item_field->table_name || !table_name ||
2186 2187
	   (!my_strcasecmp(table_alias_charset, item_field->table_name,
			   table_name) &&
unknown's avatar
unknown committed
2188
	    (!item_field->db_name || !db_name ||
2189 2190
	     (item_field->db_name && !strcmp(item_field->db_name,
					     db_name))))));
unknown's avatar
unknown committed
2191 2192
}

2193

unknown's avatar
unknown committed
2194 2195 2196 2197
table_map Item_field::used_tables() const
{
  if (field->table->const_table)
    return 0;					// const item
unknown's avatar
unknown committed
2198
  return (depended_from ? OUTER_REF_TABLE_BIT : field->table->map);
unknown's avatar
unknown committed
2199 2200
}

2201

2202
Item *Item_field::get_tmp_table_item(THD *thd)
2203
{
2204
  Item_field *new_item= new Item_field(thd, this);
2205 2206 2207 2208
  if (new_item)
    new_item->field= new_item->result_field;
  return new_item;
}
unknown's avatar
unknown committed
2209

2210 2211 2212 2213 2214
longlong Item_field::val_int_endpoint(bool left_endp, bool *incl_endp)
{
  longlong res= val_int();
  return null_value? LONGLONG_MIN : res;
}
2215

unknown's avatar
unknown committed
2216
/**
2217
  Create an item from a string we KNOW points to a valid longlong
unknown's avatar
unknown committed
2218
  end \\0 terminated number string.
2219
  This is always 'signed'. Unsigned values are created with Item_uint()
unknown's avatar
unknown committed
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232
*/

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


unknown's avatar
unknown committed
2233 2234 2235 2236 2237 2238
my_decimal *Item_int::val_decimal(my_decimal *decimal_value)
{
  int2my_decimal(E_DEC_FATAL_ERROR, value, unsigned_flag, decimal_value);
  return decimal_value;
}

unknown's avatar
unknown committed
2239 2240
String *Item_int::val_str(String *str)
{
unknown's avatar
unknown committed
2241
  // following assert is redundant, because fixed=1 assigned in constructor
2242
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2243
  str->set(value, &my_charset_bin);
unknown's avatar
unknown committed
2244 2245 2246
  return str;
}

2247
void Item_int::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
2248
{
unknown's avatar
unknown committed
2249 2250
  // my_charset_bin is good enough for numbers
  str_value.set(value, &my_charset_bin);
unknown's avatar
unknown committed
2251
  str->append(str_value);
unknown's avatar
unknown committed
2252 2253
}

2254

unknown's avatar
unknown committed
2255 2256 2257 2258 2259 2260 2261
Item_uint::Item_uint(const char *str_arg, uint length):
  Item_int(str_arg, length)
{
  unsigned_flag= 1;
}


2262 2263 2264 2265 2266 2267 2268
Item_uint::Item_uint(const char *str_arg, longlong i, uint length):
  Item_int(str_arg, i, length)
{
  unsigned_flag= 1;
}


unknown's avatar
unknown committed
2269 2270
String *Item_uint::val_str(String *str)
{
unknown's avatar
unknown committed
2271
  // following assert is redundant, because fixed=1 assigned in constructor
2272
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2273
  str->set((ulonglong) value, &my_charset_bin);
unknown's avatar
unknown committed
2274 2275 2276
  return str;
}

2277

2278
void Item_uint::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
2279
{
2280
  // latin1 is good enough for numbers
unknown's avatar
unknown committed
2281 2282
  str_value.set((ulonglong) value, default_charset());
  str->append(str_value);
unknown's avatar
unknown committed
2283 2284
}

unknown's avatar
unknown committed
2285

unknown's avatar
unknown committed
2286 2287 2288 2289 2290 2291 2292
Item_decimal::Item_decimal(const char *str_arg, uint length,
                           CHARSET_INFO *charset)
{
  str2my_decimal(E_DEC_FATAL_ERROR, str_arg, length, charset, &decimal_value);
  name= (char*) str_arg;
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
unknown's avatar
unknown committed
2293 2294
  max_length= my_decimal_precision_to_length(decimal_value.intg + decimals,
                                             decimals, unsigned_flag);
unknown's avatar
unknown committed
2295 2296 2297 2298 2299 2300 2301
}

Item_decimal::Item_decimal(longlong val, bool unsig)
{
  int2my_decimal(E_DEC_FATAL_ERROR, val, unsig, &decimal_value);
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
unknown's avatar
unknown committed
2302 2303
  max_length= my_decimal_precision_to_length(decimal_value.intg + decimals,
                                             decimals, unsigned_flag);
unknown's avatar
unknown committed
2304 2305 2306 2307 2308 2309 2310 2311
}


Item_decimal::Item_decimal(double val, int precision, int scale)
{
  double2my_decimal(E_DEC_FATAL_ERROR, val, &decimal_value);
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
unknown's avatar
unknown committed
2312 2313
  max_length= my_decimal_precision_to_length(decimal_value.intg + decimals,
                                             decimals, unsigned_flag);
unknown's avatar
unknown committed
2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332
}


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


Item_decimal::Item_decimal(my_decimal *value_par)
{
  my_decimal2decimal(value_par, &decimal_value);
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
unknown's avatar
unknown committed
2333
  max_length= my_decimal_precision_to_length(decimal_value.intg + decimals,
2334
                                             decimals, unsigned_flag);
unknown's avatar
unknown committed
2335 2336 2337
}


2338
Item_decimal::Item_decimal(const uchar *bin, int precision, int scale)
unknown's avatar
unknown committed
2339
{
unknown's avatar
unknown committed
2340 2341
  binary2my_decimal(E_DEC_FATAL_ERROR, bin,
                    &decimal_value, precision, scale);
unknown's avatar
unknown committed
2342 2343
  decimals= (uint8) decimal_value.frac;
  fixed= 1;
unknown's avatar
unknown committed
2344
  max_length= my_decimal_precision_to_length(precision, decimals,
2345
                                             unsigned_flag);
unknown's avatar
unknown committed
2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
}


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

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

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

2370
void Item_decimal::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
2371 2372 2373 2374 2375 2376
{
  my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value, 0, 0, 0, &str_value);
  str->append(str_value);
}


2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394
bool Item_decimal::eq(const Item *item, bool binary_cmp) const
{
  if (type() == item->type() && item->basic_const_item())
  {
    /*
      We need to cast off const to call val_decimal(). This should
      be OK for a basic constant. Additionally, we can pass 0 as
      a true decimal constant will return its internal decimal
      storage and ignore the argument.
    */
    Item *arg= (Item*) item;
    my_decimal *value= arg->val_decimal(0);
    return !my_decimal_cmp(&decimal_value, value);
  }
  return 0;
}


2395 2396 2397 2398 2399 2400 2401 2402 2403 2404
void Item_decimal::set_decimal_value(my_decimal *value_par)
{
  my_decimal2decimal(value_par, &decimal_value);
  decimals= (uint8) decimal_value.frac;
  unsigned_flag= !decimal_value.sign();
  max_length= my_decimal_precision_to_length(decimal_value.intg + decimals,
                                             decimals, unsigned_flag);
}


unknown's avatar
unknown committed
2405
String *Item_float::val_str(String *str)
unknown's avatar
unknown committed
2406
{
unknown's avatar
unknown committed
2407
  // following assert is redundant, because fixed=1 assigned in constructor
2408
  DBUG_ASSERT(fixed == 1);
2409
  str->set_real(value,decimals,&my_charset_bin);
unknown's avatar
unknown committed
2410 2411 2412
  return str;
}

2413

unknown's avatar
unknown committed
2414 2415 2416 2417 2418 2419 2420 2421 2422
my_decimal *Item_float::val_decimal(my_decimal *decimal_value)
{
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
  double2my_decimal(E_DEC_FATAL_ERROR, value, decimal_value);
  return (decimal_value);
}


2423
void Item_string::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
2424
{
2425
  if (query_type == QT_ORDINARY && is_cs_specified())
2426 2427 2428 2429 2430
  {
    str->append('_');
    str->append(collation.collation->csname);
  }

unknown's avatar
unknown committed
2431
  str->append('\'');
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455

  if (query_type == QT_ORDINARY ||
      my_charset_same(str_value.charset(), system_charset_info))
  {
    str_value.print(str);
  }
  else
  {
    THD *thd= current_thd;
    LEX_STRING utf8_lex_str;

    thd->convert_string(&utf8_lex_str,
                        system_charset_info,
                        str_value.c_ptr_safe(),
                        str_value.length(),
                        str_value.charset());

    String utf8_str(utf8_lex_str.str,
                    utf8_lex_str.length,
                    system_charset_info);

    utf8_str.print(str);
  }

unknown's avatar
unknown committed
2456 2457 2458
  str->append('\'');
}

unknown's avatar
unknown committed
2459

2460 2461
double 
double_from_string_with_check (CHARSET_INFO *cs, const char *cptr, char *end)
2462 2463
{
  int error;
2464
  char *org_end;
2465 2466
  double tmp;

2467 2468
  org_end= end;
  tmp= my_strntod(cs, (char*) cptr, end - cptr, &end, &error);
2469 2470
  if (error || (end != org_end && !check_if_only_end_space(cs, end, org_end)))
  {
2471 2472 2473 2474
    /*
      We can use str_value.ptr() here as Item_string is gurantee to put an
      end \0 here.
    */
2475 2476 2477
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_TRUNCATED_WRONG_VALUE,
                        ER(ER_TRUNCATED_WRONG_VALUE), "DOUBLE",
2478
                        cptr);
2479 2480 2481 2482 2483
  }
  return tmp;
}


2484
double Item_string::val_real()
2485 2486
{
  DBUG_ASSERT(fixed == 1);
2487 2488 2489 2490 2491 2492 2493 2494
  return double_from_string_with_check (str_value.charset(), str_value.ptr(), 
                                        (char *) str_value.ptr() + str_value.length());
}


longlong 
longlong_from_string_with_check (CHARSET_INFO *cs, const char *cptr, char *end)
{
2495 2496 2497 2498
  int err;
  longlong tmp;
  char *org_end= end;

2499
  tmp= (*(cs->cset->strtoll10))(cs, cptr, &end, &err);
2500 2501 2502 2503 2504 2505 2506 2507 2508 2509
  /*
    TODO: Give error if we wanted a signed integer and we got an unsigned
    one
  */
  if (err > 0 ||
      (end != org_end && !check_if_only_end_space(cs, end, org_end)))
  {
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_TRUNCATED_WRONG_VALUE,
                        ER(ER_TRUNCATED_WRONG_VALUE), "INTEGER",
2510
                        cptr);
2511 2512 2513 2514 2515
  }
  return tmp;
}


2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527
/**
  @todo
  Give error if we wanted a signed integer and we got an unsigned one
*/
longlong Item_string::val_int()
{
  DBUG_ASSERT(fixed == 1);
  return longlong_from_string_with_check(str_value.charset(), str_value.ptr(),
                             (char *) str_value.ptr()+ str_value.length());
}


unknown's avatar
unknown committed
2528 2529
my_decimal *Item_string::val_decimal(my_decimal *decimal_value)
{
2530
  return val_decimal_from_string(decimal_value);
unknown's avatar
unknown committed
2531 2532 2533
}


2534 2535
bool Item_null::eq(const Item *item, bool binary_cmp) const
{ return item->type() == type(); }
unknown's avatar
unknown committed
2536 2537


2538
double Item_null::val_real()
2539
{
unknown's avatar
unknown committed
2540 2541
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
2542 2543 2544 2545 2546
  null_value=1;
  return 0.0;
}
longlong Item_null::val_int()
{
unknown's avatar
unknown committed
2547 2548
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
2549 2550 2551
  null_value=1;
  return 0;
}
unknown's avatar
unknown committed
2552 2553
/* ARGSUSED */
String *Item_null::val_str(String *str)
2554
{
unknown's avatar
unknown committed
2555 2556
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
2557 2558 2559
  null_value=1;
  return 0;
}
unknown's avatar
unknown committed
2560

unknown's avatar
unknown committed
2561 2562 2563 2564 2565
my_decimal *Item_null::val_decimal(my_decimal *decimal_value)
{
  return 0;
}

unknown's avatar
unknown committed
2566

2567 2568 2569 2570 2571 2572
Item *Item_null::safe_charset_converter(CHARSET_INFO *tocs)
{
  collation.set(tocs);
  return this;
}

2573 2574
/*********************** Item_param related ******************************/

unknown's avatar
unknown committed
2575
/** 
2576
  Default function of Item_param::set_param_func, so in case
unknown's avatar
unknown committed
2577
  of malformed packet the server won't SIGSEGV.
2578 2579 2580 2581 2582 2583 2584 2585 2586 2587
*/

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

2588

2589
Item_param::Item_param(uint pos_in_query_arg) :
2590
  state(NO_VALUE),
2591
  item_result_type(STRING_RESULT),
2592 2593
  /* Don't pretend to be a literal unless value for this item is set. */
  item_type(PARAM_ITEM),
2594
  param_type(MYSQL_TYPE_VARCHAR),
2595
  pos_in_query(pos_in_query_arg),
2596 2597
  set_param_func(default_set_param_func),
  limit_clause_param(FALSE)
2598 2599
{
  name= (char*) "?";
2600 2601 2602 2603 2604 2605
  /* 
    Since we can't say whenever this item can be NULL or cannot be NULL
    before mysql_stmt_execute(), so we assuming that it can be NULL until
    value is set.
  */
  maybe_null= 1;
unknown's avatar
unknown committed
2606 2607
  cnvitem= new Item_string("", 0, &my_charset_bin, DERIVATION_COERCIBLE);
  cnvstr.set(cnvbuf, sizeof(cnvbuf), &my_charset_bin);
2608
}
unknown's avatar
unknown committed
2609

2610

unknown's avatar
unknown committed
2611
void Item_param::set_null()
2612 2613
{
  DBUG_ENTER("Item_param::set_null");
2614
  /* These are cleared after each execution by reset() method */
2615 2616 2617 2618 2619 2620 2621 2622 2623
  null_value= 1;
  /* 
    Because of NULL and string values we need to set max_length for each new
    placeholder value: user can submit NULL for any placeholder type, and 
    string length can be different in each execution.
  */
  max_length= 0;
  decimals= 0;
  state= NULL_VALUE;
2624
  item_type= Item::NULL_ITEM;
2625
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
2626 2627
}

2628
void Item_param::set_int(longlong i, uint32 max_length_arg)
2629 2630
{
  DBUG_ENTER("Item_param::set_int");
2631 2632 2633 2634
  value.integer= (longlong) i;
  state= INT_VALUE;
  max_length= max_length_arg;
  decimals= 0;
2635
  maybe_null= 0;
2636
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
2637 2638
}

2639
void Item_param::set_double(double d)
2640 2641
{
  DBUG_ENTER("Item_param::set_double");
2642 2643 2644
  value.real= d;
  state= REAL_VALUE;
  max_length= DBL_DIG + 8;
2645
  decimals= NOT_FIXED_DEC;
2646
  maybe_null= 0;
2647
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
2648 2649 2650
}


unknown's avatar
unknown committed
2651
/**
unknown's avatar
unknown committed
2652 2653
  Set decimal parameter value from string.

unknown's avatar
unknown committed
2654 2655
  @param str      character string
  @param length   string length
unknown's avatar
unknown committed
2656

unknown's avatar
unknown committed
2657 2658
  @note
    As we use character strings to send decimal values in
unknown's avatar
unknown committed
2659 2660 2661
    binary protocol, we use str2my_decimal to convert it to
    internal decimal value.
*/
2662

unknown's avatar
unknown committed
2663 2664
void Item_param::set_decimal(const char *str, ulong length)
{
2665
  char *end;
unknown's avatar
unknown committed
2666 2667
  DBUG_ENTER("Item_param::set_decimal");

2668 2669
  end= (char*) str+length;
  str2my_decimal(E_DEC_FATAL_ERROR, str, &decimal_value, &end);
unknown's avatar
unknown committed
2670 2671
  state= DECIMAL_VALUE;
  decimals= decimal_value.frac;
unknown's avatar
unknown committed
2672 2673
  max_length= my_decimal_precision_to_length(decimal_value.precision(),
                                             decimals, unsigned_flag);
unknown's avatar
unknown committed
2674 2675 2676 2677 2678
  maybe_null= 0;
  DBUG_VOID_RETURN;
}


unknown's avatar
unknown committed
2679
/**
2680
  Set parameter value from MYSQL_TIME value.
2681

unknown's avatar
unknown committed
2682 2683 2684
  @param tm              datetime value to set (time_type is ignored)
  @param type            type of datetime value
  @param max_length_arg  max length of datetime value as string
2685

unknown's avatar
unknown committed
2686
  @note
2687 2688 2689 2690 2691
    If we value to be stored is not normalized, zero value will be stored
    instead and proper warning will be produced. This function relies on
    the fact that even wrong value sent over binary protocol fits into
    MAX_DATE_STRING_REP_LENGTH buffer.
*/
2692
void Item_param::set_time(MYSQL_TIME *tm, timestamp_type time_type,
2693
                          uint32 max_length_arg)
2694
{ 
2695
  DBUG_ENTER("Item_param::set_time");
2696

2697
  value.time= *tm;
2698
  value.time.time_type= time_type;
2699

2700 2701
  if (value.time.year > 9999 || value.time.month > 12 ||
      value.time.day > 31 ||
2702
      (time_type != MYSQL_TIMESTAMP_TIME && value.time.hour > 23) ||
2703 2704 2705 2706
      value.time.minute > 59 || value.time.second > 59)
  {
    char buff[MAX_DATE_STRING_REP_LENGTH];
    uint length= my_TIME_to_str(&value.time, buff);
2707 2708
    make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                                 buff, length, time_type, 0);
2709 2710 2711
    set_zero_time(&value.time, MYSQL_TIMESTAMP_ERROR);
  }

2712
  state= TIME_VALUE;
2713
  maybe_null= 0;
2714 2715
  max_length= max_length_arg;
  decimals= 0;
2716
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
2717 2718
}

2719

2720 2721 2722 2723 2724 2725 2726
bool Item_param::set_str(const char *str, ulong length)
{
  DBUG_ENTER("Item_param::set_str");
  /*
    Assign string with no conversion: data is converted only after it's
    been written to the binary log.
  */
2727 2728 2729
  uint dummy_errors;
  if (str_value.copy(str, length, &my_charset_bin, &my_charset_bin,
                     &dummy_errors))
2730 2731
    DBUG_RETURN(TRUE);
  state= STRING_VALUE;
unknown's avatar
unknown committed
2732
  max_length= length;
2733
  maybe_null= 0;
2734 2735 2736
  /* max_length and decimals are set after charset conversion */
  /* sic: str may be not null-terminated, don't add DBUG_PRINT here */
  DBUG_RETURN(FALSE);
2737 2738 2739
}


2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755
bool Item_param::set_longdata(const char *str, ulong length)
{
  DBUG_ENTER("Item_param::set_longdata");

  /*
    If client character set is multibyte, end of long data packet
    may hit at the middle of a multibyte character.  Additionally,
    if binary log is open we must write long data value to the
    binary log in character set of client. This is why we can't
    convert long data to connection character set as it comes
    (here), and first have to concatenate all pieces together,
    write query to the binary log and only then perform conversion.
  */
  if (str_value.append(str, length, &my_charset_bin))
    DBUG_RETURN(TRUE);
  state= LONG_DATA_VALUE;
2756
  maybe_null= 0;
2757 2758

  DBUG_RETURN(FALSE);
2759 2760 2761
}


unknown's avatar
unknown committed
2762
/**
2763 2764
  Set parameter value from user variable value.

unknown's avatar
unknown committed
2765 2766
  @param thd   Current thread
  @param entry User variable structure (NULL means use NULL value)
2767

unknown's avatar
unknown committed
2768
  @retval
2769
    0 OK
unknown's avatar
unknown committed
2770
  @retval
unknown's avatar
unknown committed
2771
    1 Out of memory
2772 2773 2774 2775 2776 2777 2778 2779
*/

bool Item_param::set_from_user_var(THD *thd, const user_var_entry *entry)
{
  DBUG_ENTER("Item_param::set_from_user_var");
  if (entry && entry->value)
  {
    item_result_type= entry->type;
2780
    unsigned_flag= entry->unsigned_flag;
2781 2782 2783 2784 2785 2786 2787
    if (limit_clause_param)
    {
      my_bool unused;
      set_int(entry->val_int(&unused), MY_INT64_NUM_DECIMAL_DIGITS);
      item_type= Item::INT_ITEM;
      DBUG_RETURN(!unsigned_flag && value.integer < 0 ? 1 : 0);
    }
2788
    switch (item_result_type) {
unknown's avatar
unknown committed
2789 2790
    case REAL_RESULT:
      set_double(*(double*)entry->value);
2791
      item_type= Item::REAL_ITEM;
unknown's avatar
unknown committed
2792 2793
      break;
    case INT_RESULT:
2794
      set_int(*(longlong*)entry->value, MY_INT64_NUM_DECIMAL_DIGITS);
2795
      item_type= Item::INT_ITEM;
unknown's avatar
unknown committed
2796 2797
      break;
    case STRING_RESULT:
2798
    {
unknown's avatar
unknown committed
2799 2800 2801 2802
      CHARSET_INFO *fromcs= entry->collation.collation;
      CHARSET_INFO *tocs= thd->variables.collation_connection;
      uint32 dummy_offset;

2803 2804
      value.cs_info.character_set_of_placeholder= 
        value.cs_info.character_set_client= fromcs;
unknown's avatar
unknown committed
2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822
      /*
        Setup source and destination character sets so that they
        are different only if conversion is necessary: this will
        make later checks easier.
      */
      value.cs_info.final_character_set_of_str_value=
        String::needs_conversion(0, fromcs, tocs, &dummy_offset) ?
        tocs : fromcs;
      /*
        Exact value of max_length is not known unless data is converted to
        charset of connection, so we have to set it later.
      */
      item_type= Item::STRING_ITEM;

      if (set_str((const char *)entry->value, entry->length))
        DBUG_RETURN(1);
      break;
    }
unknown's avatar
unknown committed
2823 2824 2825 2826 2827 2828
    case DECIMAL_RESULT:
    {
      const my_decimal *ent_value= (const my_decimal *)entry->value;
      my_decimal2decimal(ent_value, &decimal_value);
      state= DECIMAL_VALUE;
      decimals= ent_value->frac;
unknown's avatar
unknown committed
2829 2830
      max_length= my_decimal_precision_to_length(ent_value->precision(),
                                                 decimals, unsigned_flag);
2831
      item_type= Item::DECIMAL_ITEM;
unknown's avatar
unknown committed
2832 2833
      break;
    }
unknown's avatar
unknown committed
2834 2835 2836
    default:
      DBUG_ASSERT(0);
      set_null();
2837 2838 2839 2840 2841 2842 2843 2844
    }
  }
  else
    set_null();

  DBUG_RETURN(0);
}

unknown's avatar
unknown committed
2845 2846 2847 2848 2849
/**
  Resets parameter after execution.

  @note
    We clear null_value here instead of setting it in set_* methods,
2850 2851 2852 2853
    because we want more easily handle case for long data.
*/

void Item_param::reset()
2854
{
2855
  DBUG_ENTER("Item_param::reset");
2856 2857 2858 2859 2860
  /* Shrink string buffer if it's bigger than max possible CHAR column */
  if (str_value.alloced_length() > MAX_CHAR_WIDTH)
    str_value.free();
  else
    str_value.length(0);
2861
  str_value_ptr.length(0);
2862
  /*
unknown's avatar
unknown committed
2863
    We must prevent all charset conversions until data has been written
2864
    to the binary log.
2865 2866
  */
  str_value.set_charset(&my_charset_bin);
2867
  collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
2868
  state= NO_VALUE;
2869 2870
  maybe_null= 1;
  null_value= 0;
2871 2872 2873 2874 2875 2876 2877 2878 2879
  /*
    Don't reset item_type to PARAM_ITEM: it's only needed to guard
    us from item optimizations at prepare stage, when item doesn't yet
    contain a literal of some kind.
    In all other cases when this object is accessed its value is
    set (this assumption is guarded by 'state' and
    DBUG_ASSERTS(state != NO_VALUE) in all Item_param::get_*
    methods).
  */
2880
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
2881 2882 2883
}


unknown's avatar
unknown committed
2884
int Item_param::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
2885 2886
{
  field->set_notnull();
2887 2888 2889

  switch (state) {
  case INT_VALUE:
2890
    return field->store(value.integer, unsigned_flag);
2891 2892
  case REAL_VALUE:
    return field->store(value.real);
unknown's avatar
unknown committed
2893 2894
  case DECIMAL_VALUE:
    return field->store_decimal(&decimal_value);
2895 2896
  case TIME_VALUE:
    field->store_time(&value.time, value.time.time_type);
2897
    return 0;
2898 2899 2900 2901 2902
  case STRING_VALUE:
  case LONG_DATA_VALUE:
    return field->store(str_value.ptr(), str_value.length(),
                        str_value.charset());
  case NULL_VALUE:
2903
    return set_field_to_null_with_conversions(field, no_conversions);
2904 2905 2906
  case NO_VALUE:
  default:
    DBUG_ASSERT(0);
unknown's avatar
unknown committed
2907
  }
2908
  return 1;
unknown's avatar
unknown committed
2909 2910
}

2911

2912
bool Item_param::get_time(MYSQL_TIME *res)
2913
{
2914 2915 2916 2917 2918 2919 2920 2921 2922 2923
  if (state == TIME_VALUE)
  {
    *res= value.time;
    return 0;
  }
  /*
    If parameter value isn't supplied assertion will fire in val_str()
    which is called from Item::get_time().
  */
  return Item::get_time(res);
2924
}
2925

2926

2927
bool Item_param::get_date(MYSQL_TIME *res, uint fuzzydate)
2928 2929 2930 2931 2932 2933 2934 2935 2936 2937
{
  if (state == TIME_VALUE)
  {
    *res= value.time;
    return 0;
  }
  return Item::get_date(res, fuzzydate);
}


2938
double Item_param::val_real()
unknown's avatar
unknown committed
2939
{
2940 2941 2942 2943 2944
  switch (state) {
  case REAL_VALUE:
    return value.real;
  case INT_VALUE:
    return (double) value.integer;
unknown's avatar
unknown committed
2945 2946 2947 2948 2949 2950
  case DECIMAL_VALUE:
  {
    double result;
    my_decimal2double(E_DEC_FATAL_ERROR, &decimal_value, &result);
    return result;
  }
2951 2952
  case STRING_VALUE:
  case LONG_DATA_VALUE:
2953 2954 2955 2956 2957 2958
  {
    int dummy_err;
    char *end_not_used;
    return my_strntod(str_value.charset(), (char*) str_value.ptr(),
                      str_value.length(), &end_not_used, &dummy_err);
  }
2959 2960 2961 2962 2963
  case TIME_VALUE:
    /*
      This works for example when user says SELECT ?+0.0 and supplies
      time value for the placeholder.
    */
2964
    return ulonglong2double(TIME_to_ulonglong(&value.time));
2965
  case NULL_VALUE:
2966
    return 0.0;
unknown's avatar
unknown committed
2967
  default:
2968
    DBUG_ASSERT(0);
unknown's avatar
unknown committed
2969
  }
2970
  return 0.0;
unknown's avatar
unknown committed
2971 2972
} 

2973

unknown's avatar
unknown committed
2974 2975
longlong Item_param::val_int() 
{ 
2976 2977
  switch (state) {
  case REAL_VALUE:
2978
    return (longlong) rint(value.real);
2979 2980
  case INT_VALUE:
    return value.integer;
unknown's avatar
unknown committed
2981 2982 2983 2984 2985 2986
  case DECIMAL_VALUE:
  {
    longlong i;
    my_decimal2int(E_DEC_FATAL_ERROR, &decimal_value, unsigned_flag, &i);
    return i;
  }
2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997
  case STRING_VALUE:
  case LONG_DATA_VALUE:
    {
      int dummy_err;
      return my_strntoll(str_value.charset(), str_value.ptr(),
                         str_value.length(), 10, (char**) 0, &dummy_err);
    }
  case TIME_VALUE:
    return (longlong) TIME_to_ulonglong(&value.time);
  case NULL_VALUE:
    return 0; 
unknown's avatar
unknown committed
2998
  default:
2999
    DBUG_ASSERT(0);
unknown's avatar
unknown committed
3000
  }
3001
  return 0;
unknown's avatar
unknown committed
3002 3003
}

3004

unknown's avatar
unknown committed
3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034
my_decimal *Item_param::val_decimal(my_decimal *dec)
{
  switch (state) {
  case DECIMAL_VALUE:
    return &decimal_value;
  case REAL_VALUE:
    double2my_decimal(E_DEC_FATAL_ERROR, value.real, dec);
    return dec;
  case INT_VALUE:
    int2my_decimal(E_DEC_FATAL_ERROR, value.integer, unsigned_flag, dec);
    return dec;
  case STRING_VALUE:
  case LONG_DATA_VALUE:
    string2my_decimal(E_DEC_FATAL_ERROR, &str_value, dec);
    return dec;
  case TIME_VALUE:
  {
    longlong i= (longlong) TIME_to_ulonglong(&value.time);
    int2my_decimal(E_DEC_FATAL_ERROR, i, 0, dec);
    return dec;
  }
  case NULL_VALUE:
    return 0; 
  default:
    DBUG_ASSERT(0);
  }
  return 0;
}


unknown's avatar
unknown committed
3035 3036
String *Item_param::val_str(String* str) 
{ 
3037 3038 3039
  switch (state) {
  case STRING_VALUE:
  case LONG_DATA_VALUE:
3040
    return &str_value_ptr;
3041
  case REAL_VALUE:
3042
    str->set_real(value.real, NOT_FIXED_DEC, &my_charset_bin);
3043 3044 3045
    return str;
  case INT_VALUE:
    str->set(value.integer, &my_charset_bin);
unknown's avatar
unknown committed
3046
    return str;
unknown's avatar
unknown committed
3047 3048 3049 3050 3051
  case DECIMAL_VALUE:
    if (my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value,
                          0, 0, 0, str) <= 1)
      return str;
    return NULL;
3052 3053
  case TIME_VALUE:
  {
3054
    if (str->reserve(MAX_DATE_STRING_REP_LENGTH))
3055
      break;
3056 3057
    str->length((uint) my_TIME_to_str(&value.time, (char*) str->ptr()));
    str->set_charset(&my_charset_bin);
unknown's avatar
unknown committed
3058
    return str;
3059 3060 3061
  }
  case NULL_VALUE:
    return NULL; 
unknown's avatar
unknown committed
3062
  default:
3063
    DBUG_ASSERT(0);
unknown's avatar
unknown committed
3064
  }
3065
  return str;
unknown's avatar
unknown committed
3066
}
3067

unknown's avatar
unknown committed
3068
/**
3069
  Return Param item values in string format, for generating the dynamic 
unknown's avatar
unknown committed
3070 3071 3072 3073 3074 3075 3076
  query used in update/binary logs.

  @todo
    - Change interface and implementation to fill log data in place
    and avoid one more memcpy/alloc between str and log string.
    - In case of error we need to notify replication
    that binary log contains wrong statement 
3077 3078
*/

3079
const String *Item_param::query_val_str(String* str) const
3080
{
3081 3082
  switch (state) {
  case INT_VALUE:
unknown's avatar
unknown committed
3083
    str->set_int(value.integer, unsigned_flag, &my_charset_bin);
3084 3085
    break;
  case REAL_VALUE:
3086
    str->set_real(value.real, NOT_FIXED_DEC, &my_charset_bin);
3087
    break;
unknown's avatar
unknown committed
3088 3089 3090 3091 3092
  case DECIMAL_VALUE:
    if (my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value,
                          0, 0, 0, str) > 1)
      return &my_null_string;
    break;
3093
  case TIME_VALUE:
3094
    {
3095 3096 3097 3098 3099 3100
      char *buf, *ptr;
      str->length(0);
      /*
        TODO: in case of error we need to notify replication
        that binary log contains wrong statement 
      */
3101
      if (str->reserve(MAX_DATE_STRING_REP_LENGTH+3))
3102 3103 3104 3105 3106 3107
        break; 

      /* Create date string inplace */
      buf= str->c_ptr_quick();
      ptr= buf;
      *ptr++= '\'';
3108
      ptr+= (uint) my_TIME_to_str(&value.time, ptr);
3109 3110 3111
      *ptr++= '\'';
      str->length((uint32) (ptr - buf));
      break;
3112
    }
3113 3114
  case STRING_VALUE:
  case LONG_DATA_VALUE:
3115
    {
3116
      str->length(0);
3117
      append_query_string(value.cs_info.character_set_client, &str_value, str);
3118
      break;
3119
    }
3120 3121 3122 3123
  case NULL_VALUE:
    return &my_null_string;
  default:
    DBUG_ASSERT(0);
3124 3125 3126
  }
  return str;
}
3127 3128


unknown's avatar
unknown committed
3129
/**
3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145
  Convert string from client character set to the character set of
  connection.
*/

bool Item_param::convert_str_value(THD *thd)
{
  bool rc= FALSE;
  if (state == STRING_VALUE || state == LONG_DATA_VALUE)
  {
    /*
      Check is so simple because all charsets were set up properly
      in setup_one_conversion_function, where typecode of
      placeholder was also taken into account: the variables are different
      here only if conversion is really necessary.
    */
    if (value.cs_info.final_character_set_of_str_value !=
3146
        value.cs_info.character_set_of_placeholder)
3147 3148
    {
      rc= thd->convert_string(&str_value,
3149
                              value.cs_info.character_set_of_placeholder,
3150 3151
                              value.cs_info.final_character_set_of_str_value);
    }
3152 3153 3154 3155
    else
      str_value.set_charset(value.cs_info.final_character_set_of_str_value);
    /* Here str_value is guaranteed to be in final_character_set_of_str_value */

3156
    max_length= str_value.numchars() * str_value.charset()->mbmaxlen;
3157
    decimals= 0;
3158 3159 3160 3161 3162 3163
    /*
      str_value_ptr is returned from val_str(). It must be not alloced
      to prevent it's modification by val_str() invoker.
    */
    str_value_ptr.set(str_value.ptr(), str_value.length(),
                      str_value.charset());
3164 3165
    /* Synchronize item charset with value charset */
    collation.set(str_value.charset(), DERIVATION_COERCIBLE);
3166 3167 3168 3169
  }
  return rc;
}

unknown's avatar
unknown committed
3170

3171 3172 3173 3174 3175 3176 3177
bool Item_param::basic_const_item() const
{
  if (state == NO_VALUE || state == TIME_VALUE)
    return FALSE;
  return TRUE;
}

unknown's avatar
unknown committed
3178

3179
Item *
3180
Item_param::clone_item()
3181 3182 3183 3184 3185 3186
{
  /* see comments in the header file */
  switch (state) {
  case NULL_VALUE:
    return new Item_null(name);
  case INT_VALUE:
3187 3188 3189
    return (unsigned_flag ?
            new Item_uint(name, value.integer, max_length) :
            new Item_int(name, value.integer, max_length));
3190
  case REAL_VALUE:
3191
    return new Item_float(name, value.real, decimals, max_length);
3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224
  case STRING_VALUE:
  case LONG_DATA_VALUE:
    return new Item_string(name, str_value.c_ptr_quick(), str_value.length(),
                           str_value.charset());
  case TIME_VALUE:
    break;
  case NO_VALUE:
  default:
    DBUG_ASSERT(0);
  };
  return 0;
}


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

  switch (state) {
  case NULL_VALUE:
    return TRUE;
  case INT_VALUE:
    return value.integer == item->val_int() &&
           unsigned_flag == item->unsigned_flag;
  case REAL_VALUE:
3225
    return value.real == item->val_real();
3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236
  case STRING_VALUE:
  case LONG_DATA_VALUE:
    if (binary_cmp)
      return !stringcmp(&str_value, &item->str_value);
    return !sortcmp(&str_value, &item->str_value, collation.collation);
  default:
    break;
  }
  return FALSE;
}

unknown's avatar
unknown committed
3237 3238
/* End of Item_param related */

3239
void Item_param::print(String *str, enum_query_type query_type)
3240 3241 3242 3243 3244 3245 3246
{
  if (state == NO_VALUE)
  {
    str->append('?');
  }
  else
  {
unknown's avatar
unknown committed
3247
    char buffer[STRING_BUFFER_USUAL_SIZE];
3248 3249 3250 3251 3252 3253 3254 3255
    String tmp(buffer, sizeof(buffer), &my_charset_bin);
    const String *res;
    res= query_val_str(&tmp);
    str->append(*res);
  }
}


unknown's avatar
unknown committed
3256 3257 3258 3259
/**
  Preserve the original parameter types and values
  when re-preparing a prepared statement.

3260 3261 3262
  @details Copy parameter type information and conversion
  function pointers from a parameter of the old statement
  to the corresponding parameter of the new one.
unknown's avatar
unknown committed
3263 3264 3265 3266 3267 3268

  Move parameter values from the old parameters to the new
  one. We simply "exchange" the values, which allows
  to save on allocation and character set conversion in
  case a parameter is a string or a blob/clob.

3269 3270 3271 3272
  The old parameter gets the value of this one, which
  ensures that all memory of this parameter is freed
  correctly.

unknown's avatar
unknown committed
3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285
  @param[in]  src   parameter item of the original
                    prepared statement
*/

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

3286
  collation.set(src->collation);
unknown's avatar
unknown committed
3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298
  maybe_null= src->maybe_null;
  null_value= src->null_value;
  max_length= src->max_length;
  decimals= src->decimals;
  state= src->state;
  value= src->value;

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

3299 3300 3301
/****************************************************************************
  Item_copy_string
****************************************************************************/
3302

unknown's avatar
unknown committed
3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313
void Item_copy_string::copy()
{
  String *res=item->val_str(&str_value);
  if (res && res != &str_value)
    str_value.copy(*res);
  null_value=item->null_value;
}

/* ARGSUSED */
String *Item_copy_string::val_str(String *str)
{
3314
  // Item_copy_string is used without fix_fields call
unknown's avatar
unknown committed
3315 3316 3317 3318 3319
  if (null_value)
    return (String*) 0;
  return &str_value;
}

unknown's avatar
unknown committed
3320

unknown's avatar
unknown committed
3321 3322 3323 3324 3325 3326 3327 3328 3329 3330
my_decimal *Item_copy_string::val_decimal(my_decimal *decimal_value)
{
  // Item_copy_string is used without fix_fields call
  if (null_value)
    return 0;
  string2my_decimal(E_DEC_FATAL_ERROR, &str_value, decimal_value);
  return (decimal_value);
}


unknown's avatar
unknown committed
3331
/*
3332
  Functions to convert item to field (for send_fields)
unknown's avatar
unknown committed
3333 3334 3335
*/

/* ARGSUSED */
3336
bool Item::fix_fields(THD *thd, Item **ref)
unknown's avatar
unknown committed
3337
{
3338 3339

  // We do not check fields which are fixed during construction
unknown's avatar
unknown committed
3340
  DBUG_ASSERT(fixed == 0 || basic_const_item());
3341
  fixed= 1;
unknown's avatar
unknown committed
3342
  return FALSE;
unknown's avatar
unknown committed
3343 3344
}

3345
double Item_ref_null_helper::val_real()
3346
{
3347
  DBUG_ASSERT(fixed == 1);
3348
  double tmp= (*ref)->val_result();
unknown's avatar
unknown committed
3349
  owner->was_null|= null_value= (*ref)->null_value;
3350 3351
  return tmp;
}
3352 3353


3354 3355
longlong Item_ref_null_helper::val_int()
{
3356
  DBUG_ASSERT(fixed == 1);
3357
  longlong tmp= (*ref)->val_int_result();
unknown's avatar
unknown committed
3358
  owner->was_null|= null_value= (*ref)->null_value;
3359 3360
  return tmp;
}
3361 3362


unknown's avatar
unknown committed
3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380
my_decimal *Item_ref_null_helper::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed == 1);
  my_decimal *val= (*ref)->val_decimal_result(decimal_value);
  owner->was_null|= null_value= (*ref)->null_value;
  return val;
}


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


3381 3382
String* Item_ref_null_helper::val_str(String* s)
{
3383
  DBUG_ASSERT(fixed == 1);
3384
  String* tmp= (*ref)->str_result(s);
unknown's avatar
unknown committed
3385
  owner->was_null|= null_value= (*ref)->null_value;
3386 3387
  return tmp;
}
3388 3389


3390
bool Item_ref_null_helper::get_date(MYSQL_TIME *ltime, uint fuzzydate)
3391 3392 3393
{  
  return (owner->was_null|= null_value= (*ref)->get_date(ltime, fuzzydate));
}
unknown's avatar
unknown committed
3394

unknown's avatar
unknown committed
3395

unknown's avatar
unknown committed
3396 3397 3398
/**
  Mark item and SELECT_LEXs as dependent if item was resolved in
  outer SELECT.
unknown's avatar
unknown committed
3399

unknown's avatar
unknown committed
3400 3401 3402 3403 3404 3405
  @param thd             thread handler
  @param last            select from which current item depend
  @param current         current select
  @param resolved_item   item which was resolved in outer SELECT(for warning)
  @param mark_item       item which should be marked (can be differ in case of
                         substitution)
unknown's avatar
unknown committed
3406 3407
*/

3408
static void mark_as_dependent(THD *thd, SELECT_LEX *last, SELECT_LEX *current,
3409
                              Item_ident *resolved_item,
3410
                              Item_ident *mark_item)
unknown's avatar
unknown committed
3411
{
3412 3413 3414 3415
  const char *db_name= (resolved_item->db_name ?
                        resolved_item->db_name : "");
  const char *table_name= (resolved_item->table_name ?
                           resolved_item->table_name : "");
3416
  /* store pointer on SELECT_LEX from which item is dependent */
3417 3418
  if (mark_item)
    mark_item->depended_from= last;
Sergey Petrunia's avatar
Sergey Petrunia committed
3419
  current->mark_as_dependent(last, resolved_item);
unknown's avatar
unknown committed
3420
  if (thd->lex->describe & DESCRIBE_EXTENDED)
3421 3422 3423
  {
    char warn_buff[MYSQL_ERRMSG_SIZE];
    sprintf(warn_buff, ER(ER_WARN_FIELD_RESOLVED),
3424 3425
            db_name, (db_name[0] ? "." : ""),
            table_name, (table_name [0] ? "." : ""),
3426
            resolved_item->field_name,
3427 3428 3429 3430
	    current->select_number, last->select_number);
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		 ER_WARN_FIELD_RESOLVED, warn_buff);
  }
unknown's avatar
unknown committed
3431 3432 3433
}


unknown's avatar
unknown committed
3434 3435 3436
/**
  Mark range of selects and resolved identifier (field/reference)
  item as dependent.
3437

unknown's avatar
unknown committed
3438 3439 3440 3441 3442 3443 3444 3445 3446
  @param thd             thread handler
  @param last_select     select where resolved_item was resolved
  @param current_sel     current select (select where resolved_item was placed)
  @param found_field     field which was found during resolving
  @param found_item      Item which was found during resolving (if resolved
                         identifier belongs to VIEW)
  @param resolved_item   Identifier which was resolved

  @note
3447 3448 3449 3450 3451 3452 3453 3454 3455
    We have to mark all items between current_sel (including) and
    last_select (excluding) as dependend (select before last_select should
    be marked with actual table mask used by resolved item, all other with
    OUTER_REF_TABLE_BIT) and also write dependence information to Item of
    resolved identifier.
*/

void mark_select_range_as_dependent(THD *thd,
                                    SELECT_LEX *last_select,
unknown's avatar
unknown committed
3456
                                    SELECT_LEX *current_sel,
3457 3458 3459 3460 3461 3462 3463 3464 3465 3466
                                    Field *found_field, Item *found_item,
                                    Item_ident *resolved_item)
{
  /*
    Go from current SELECT to SELECT where field was resolved (it
    have to be reachable from current SELECT, because it was already
    done once when we resolved this field and cached result of
    resolving)
  */
  SELECT_LEX *previous_select= current_sel;
unknown's avatar
unknown committed
3467 3468
  for (; previous_select->outer_select() != last_select;
       previous_select= previous_select->outer_select())
3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495
  {
    Item_subselect *prev_subselect_item=
      previous_select->master_unit()->item;
    prev_subselect_item->used_tables_cache|= OUTER_REF_TABLE_BIT;
    prev_subselect_item->const_item_cache= 0;
  }
  {
    Item_subselect *prev_subselect_item=
      previous_select->master_unit()->item;
    Item_ident *dependent= resolved_item;
    if (found_field == view_ref_found)
    {
      Item::Type type= found_item->type();
      prev_subselect_item->used_tables_cache|=
        found_item->used_tables();
      dependent= ((type == Item::REF_ITEM || type == Item::FIELD_ITEM) ?
                  (Item_ident*) found_item :
                  0);
    }
    else
      prev_subselect_item->used_tables_cache|=
        found_field->table->map;
    prev_subselect_item->const_item_cache= 0;
    mark_as_dependent(thd, last_select, current_sel, resolved_item,
                      dependent);
  }
}
3496 3497


unknown's avatar
unknown committed
3498
/**
3499 3500
  Search a GROUP BY clause for a field with a certain name.

unknown's avatar
unknown committed
3501 3502 3503
  Search the GROUP BY list for a column named as find_item. When searching
  preference is given to columns that are qualified with the same table (and
  database) name as the one being searched for.
3504

unknown's avatar
unknown committed
3505 3506
  @param find_item     the item being searched for
  @param group_list    GROUP BY clause
3507

unknown's avatar
unknown committed
3508
  @return
3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519
    - the found item on success
    - NULL if find_item is not in group_list
*/

static Item** find_field_in_group_list(Item *find_item, ORDER *group_list)
{
  const char *db_name;
  const char *table_name;
  const char *field_name;
  ORDER      *found_group= NULL;
  int         found_match_degree= 0;
3520
  Item_ident *cur_field;
3521
  int         cur_match_degree= 0;
3522
  char        name_buff[NAME_LEN+1];
3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533

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

3534 3535 3536 3537 3538 3539 3540 3541
  if (db_name && lower_case_table_names)
  {
    /* Convert database to lower case for comparison */
    strmake(name_buff, db_name, sizeof(name_buff)-1);
    my_casedn_str(files_charset_info, name_buff);
    db_name= name_buff;
  }

3542
  DBUG_ASSERT(field_name != 0);
3543 3544 3545

  for (ORDER *cur_group= group_list ; cur_group ; cur_group= cur_group->next)
  {
unknown's avatar
unknown committed
3546
    if ((*(cur_group->item))->real_item()->type() == Item::FIELD_ITEM)
3547
    {
3548
      cur_field= (Item_ident*) *cur_group->item;
3549 3550
      cur_match_degree= 0;
      
3551
      DBUG_ASSERT(cur_field->field_name != 0);
3552 3553 3554 3555 3556 3557 3558 3559 3560 3561

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

      if (cur_field->table_name && table_name)
      {
        /* If field_name is qualified by a table name. */
unknown's avatar
unknown committed
3562
        if (my_strcasecmp(table_alias_charset, cur_field->table_name, table_name))
3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589
          /* Same field names, different tables. */
          return NULL;

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

      if (cur_match_degree > found_match_degree)
      {
        found_match_degree= cur_match_degree;
        found_group= cur_group;
      }
      else if (found_group && (cur_match_degree == found_match_degree) &&
               ! (*(found_group->item))->eq(cur_field, 0))
      {
        /*
          If the current resolve candidate matches equally well as the current
          best match, they must reference the same column, otherwise the field
          is ambiguous.
        */
3590 3591
        my_error(ER_NON_UNIQ_ERROR, MYF(0),
                 find_item->full_name(), current_thd->where);
3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603
        return NULL;
      }
    }
  }

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


unknown's avatar
unknown committed
3604
/**
3605 3606
  Resolve a column reference in a sub-select.

unknown's avatar
unknown committed
3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618
  Resolve a column reference (usually inside a HAVING clause) against the
  SELECT and GROUP BY clauses of the query described by 'select'. The name
  resolution algorithm searches both the SELECT and GROUP BY clauses, and in
  case of a name conflict prefers GROUP BY column names over SELECT names. If
  both clauses contain different fields with the same names, a warning is
  issued that name of 'ref' is ambiguous. We extend ANSI SQL in that when no
  GROUP BY column is found, then a HAVING name is resolved as a possibly
  derived SELECT column. This extension is allowed only if the
  MODE_ONLY_FULL_GROUP_BY sql mode isn't enabled.

  @param thd     current thread
  @param ref     column reference being resolved
3619
  @param select  the select that ref is resolved against
unknown's avatar
unknown committed
3620 3621

  @note
3622 3623
    The resolution procedure is:
    - Search for a column or derived column named col_ref_i [in table T_j]
unknown's avatar
unknown committed
3624
    in the SELECT clause of Q.
3625
    - Search for a column named col_ref_i [in table T_j]
unknown's avatar
unknown committed
3626
    in the GROUP BY clause of Q.
3627
    - If found different columns with the same name in GROUP BY and SELECT
unknown's avatar
unknown committed
3628 3629 3630 3631
    - issue a warning and return the GROUP BY column,
    - otherwise
    - if the MODE_ONLY_FULL_GROUP_BY mode is enabled return error
    - else return the found SELECT column.
3632 3633


unknown's avatar
unknown committed
3634 3635 3636 3637
  @return
    - NULL - there was an error, and the error was already reported
    - not_found_item - the item was not resolved, no error was reported
    - resolved item - if the item was resolved
3638 3639 3640 3641 3642 3643 3644 3645 3646 3647
*/

static Item**
resolve_ref_in_select_and_group(THD *thd, Item_ident *ref, SELECT_LEX *select)
{
  Item **group_by_ref= NULL;
  Item **select_ref= NULL;
  ORDER *group_list= (ORDER*) select->group_list.first;
  bool ambiguous_fields= FALSE;
  uint counter;
unknown's avatar
unknown committed
3648
  enum_resolution_type resolution;
3649 3650 3651 3652 3653

  /*
    Search for a column or derived column named as 'ref' in the SELECT
    clause of the current select.
  */
3654 3655
  if (!(select_ref= find_item_in_list(ref, *(select->get_item_list()),
                                      &counter, REPORT_EXCEPT_NOT_FOUND,
unknown's avatar
unknown committed
3656
                                      &resolution)))
3657
    return NULL; /* Some error occurred. */
unknown's avatar
unknown committed
3658 3659
  if (resolution == RESOLVED_AGAINST_ALIAS)
    ref->alias_name_used= TRUE;
3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677

  /* If this is a non-aggregated field inside HAVING, search in GROUP BY. */
  if (select->having_fix_field && !ref->with_sum_func && group_list)
  {
    group_by_ref= find_field_in_group_list(ref, group_list);
    
    /* Check if the fields found in SELECT and GROUP BY are the same field. */
    if (group_by_ref && (select_ref != not_found_item) &&
        !((*group_by_ref)->eq(*select_ref, 0)))
    {
      ambiguous_fields= TRUE;
      push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_NON_UNIQ_ERROR,
                          ER(ER_NON_UNIQ_ERROR), ref->full_name(),
                          current_thd->where);

    }
  }

3678
  if (thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY &&
3679
      select->having_fix_field  &&
3680 3681 3682 3683 3684 3685 3686 3687 3688 3689
      select_ref != not_found_item && !group_by_ref)
  {
    /*
      Report the error if fields was found only in the SELECT item list and
      the strict mode is enabled.
    */
    my_error(ER_NON_GROUPING_FIELD_USED, MYF(0),
             ref->name, "HAVING");
    return NULL;
  }
3690 3691 3692 3693
  if (select_ref != not_found_item || group_by_ref)
  {
    if (select_ref != not_found_item && !ambiguous_fields)
    {
3694
      DBUG_ASSERT(*select_ref != 0);
unknown's avatar
unknown committed
3695
      if (!select->ref_pointer_array[counter])
3696
      {
3697 3698
        my_error(ER_ILLEGAL_REFERENCE, MYF(0),
                 ref->name, "forward reference in item list");
3699 3700
        return NULL;
      }
unknown's avatar
unknown committed
3701
      DBUG_ASSERT((*select_ref)->fixed);
3702 3703
      return (select->ref_pointer_array + counter);
    }
unknown's avatar
unknown committed
3704
    if (group_by_ref)
3705
      return group_by_ref;
unknown's avatar
unknown committed
3706 3707
    DBUG_ASSERT(FALSE);
    return NULL; /* So there is no compiler warning. */
3708
  }
unknown's avatar
unknown committed
3709 3710

  return (Item**) not_found_item;
3711 3712 3713
}


unknown's avatar
unknown committed
3714
/**
3715 3716
  Resolve the name of an outer select column reference.

unknown's avatar
unknown committed
3717 3718
  The method resolves the column reference represented by 'this' as a column
  present in outer selects that contain current select.
3719

unknown's avatar
unknown committed
3720 3721 3722 3723 3724
  In prepared statements, because of cache, find_field_in_tables()
  can resolve fields even if they don't belong to current context.
  In this case this method only finds appropriate context and marks
  current select as dependent. The found reference of field should be
  provided in 'from_field'.
3725

unknown's avatar
unknown committed
3726 3727 3728 3729
  @param[in] thd             current thread
  @param[in,out] from_field  found field reference or (Field*)not_found_field
  @param[in,out] reference   view column if this item was resolved to a
    view column
3730

unknown's avatar
unknown committed
3731 3732 3733 3734 3735 3736 3737
  @note
    This is the inner loop of Item_field::fix_fields:
  @code
        for each outer query Q_k beginning from the inner-most one
        {
          search for a column or derived column named col_ref_i
          [in table T_j] in the FROM clause of Q_k;
3738

unknown's avatar
unknown committed
3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750
          if such a column is not found
            Search for a column or derived column named col_ref_i
            [in table T_j] in the SELECT and GROUP clauses of Q_k.
        }
  @endcode

  @retval
    1   column succefully resolved and fix_fields() should continue.
  @retval
    0   column fully fixed and fix_fields() should return FALSE
  @retval
    -1  error occured
3751
*/
unknown's avatar
unknown committed
3752

3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770
int
Item_field::fix_outer_field(THD *thd, Field **from_field, Item **reference)
{
  enum_parsing_place place= NO_MATTER;
  bool field_found= (*from_field != not_found_field);
  bool upward_lookup= FALSE;

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

    We treat each subselect as a separate namespace, so that different
    subselects may contain columns with the same names. The subselects
    are searched starting from the innermost.
  */
  Name_resolution_context *last_checked_context= context;
  Item **ref= (Item **) not_found_item;
3771 3772
  SELECT_LEX *current_sel= (SELECT_LEX *) thd->lex->current_select;
  Name_resolution_context *outer_context= 0;
unknown's avatar
unknown committed
3773
  SELECT_LEX *select= 0;
3774 3775 3776 3777
  /* Currently derived tables cannot be correlated */
  if (current_sel->master_unit()->first_select()->linkage !=
      DERIVED_TABLE_TYPE)
    outer_context= context->outer_context;
3778 3779 3780 3781
  for (;
       outer_context;
       outer_context= outer_context->outer_context)
  {
3782
    select= outer_context->select_lex;
3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812
    Item_subselect *prev_subselect_item=
      last_checked_context->select_lex->master_unit()->item;
    last_checked_context= outer_context;
    upward_lookup= TRUE;

    place= prev_subselect_item->parsing_place;
    /*
      If outer_field is set, field was already found by first call
      to find_field_in_tables(). Only need to find appropriate context.
    */
    if (field_found && outer_context->select_lex !=
        cached_table->select_lex)
      continue;
    /*
      In case of a view, find_field_in_tables() writes the pointer to
      the found view field into '*reference', in other words, it
      substitutes this Item_field with the found expression.
    */
    if (field_found || (*from_field= find_field_in_tables(thd, this,
                                          outer_context->
                                            first_name_resolution_table,
                                          outer_context->
                                            last_name_resolution_table,
                                          reference,
                                          IGNORE_EXCEPT_NON_UNIQUE,
                                          TRUE, TRUE)) !=
        not_found_field)
    {
      if (*from_field)
      {
3813 3814 3815 3816 3817 3818 3819 3820 3821 3822
        if (thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY &&
            select->cur_pos_in_select_list != UNDEF_POS)
        {
          /*
            As this is an outer field it should be added to the list of
            non aggregated fields of the outer select.
          */
          marker= select->cur_pos_in_select_list;
          select->non_agg_fields.push_back(this);
        }
3823 3824 3825 3826
        if (*from_field != view_ref_found)
        {
          prev_subselect_item->used_tables_cache|= (*from_field)->table->map;
          prev_subselect_item->const_item_cache= 0;
3827
          set_field(*from_field);
3828
          if (!last_checked_context->select_lex->having_fix_field &&
3829 3830
              select->group_list.elements &&
              (place == SELECT_LIST || place == IN_HAVING))
3831 3832 3833
          {
            Item_outer_ref *rf;
            /*
3834 3835 3836 3837 3838 3839 3840
              If an outer field is resolved in a grouping select then it
              is replaced for an Item_outer_ref object. Otherwise an
              Item_field object is used.
              The new Item_outer_ref object is saved in the inner_refs_list of
              the outer select. Here it is only created. It can be fixed only
              after the original field has been fixed and this is done in the
              fix_inner_refs() function.
3841
            */
3842 3843
            ;
            if (!(rf= new Item_outer_ref(context, this)))
3844
              return -1;
3845
            thd->change_item_tree(reference, rf);
3846
            select->inner_refs_list.push_back(rf);
3847
            rf->in_sum_func= thd->lex->in_sum_func;
3848
          }
unknown's avatar
unknown committed
3849 3850 3851 3852 3853
          /*
            A reference is resolved to a nest level that's outer or the same as
            the nest level of the enclosing set function : adjust the value of
            max_arg_level for the function if it's needed.
          */
3854
          if (thd->lex->in_sum_func &&
unknown's avatar
unknown committed
3855
              thd->lex->in_sum_func->nest_level >= select->nest_level)
3856
          {
3857
            Item::Type ref_type= (*reference)->type();
3858 3859 3860 3861 3862 3863
            set_if_bigger(thd->lex->in_sum_func->max_arg_level,
                          select->nest_level);
            set_field(*from_field);
            fixed= 1;
            mark_as_dependent(thd, last_checked_context->select_lex,
                              context->select_lex, this,
3864 3865
                              ((ref_type == REF_ITEM ||
                                ref_type == FIELD_ITEM) ?
3866 3867 3868 3869 3870 3871
                               (Item_ident*) (*reference) : 0));
            return 0;
          }
        }
        else
        {
3872
          Item::Type ref_type= (*reference)->type();
3873 3874 3875 3876 3877 3878
          prev_subselect_item->used_tables_cache|=
            (*reference)->used_tables();
          prev_subselect_item->const_item_cache&=
            (*reference)->const_item();
          mark_as_dependent(thd, last_checked_context->select_lex,
                            context->select_lex, this,
3879
                            ((ref_type == REF_ITEM || ref_type == FIELD_ITEM) ?
3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894
                             (Item_ident*) (*reference) :
                             0));
          /*
            A reference to a view field had been found and we
            substituted it instead of this Item (find_field_in_tables
            does it by assigning the new value to *reference), so now
            we can return from this function.
          */
          return 0;
        }
      }
      break;
    }

    /* Search in SELECT and GROUP lists of the outer select. */
3895
    if (place != IN_WHERE && place != IN_ON)
3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955
    {
      if (!(ref= resolve_ref_in_select_and_group(thd, this, select)))
        return -1; /* Some error occurred (e.g. ambiguous names). */
      if (ref != not_found_item)
      {
        DBUG_ASSERT(*ref && (*ref)->fixed);
        prev_subselect_item->used_tables_cache|= (*ref)->used_tables();
        prev_subselect_item->const_item_cache&= (*ref)->const_item();
        break;
      }
    }

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

  DBUG_ASSERT(ref != 0);
  if (!*from_field)
    return -1;
  if (ref == not_found_item && *from_field == not_found_field)
  {
    if (upward_lookup)
    {
      // We can't say exactly what absent table or field
      my_error(ER_BAD_FIELD_ERROR, MYF(0), full_name(), thd->where);
    }
    else
    {
      /* Call find_field_in_tables only to report the error */
      find_field_in_tables(thd, this,
                           context->first_name_resolution_table,
                           context->last_name_resolution_table,
                           reference, REPORT_ALL_ERRORS,
                           !any_privileges &&
                           TRUE, TRUE);
    }
    return -1;
  }
  else if (ref != not_found_item)
  {
    Item *save;
    Item_ref *rf;

    /* Should have been checked in resolve_ref_in_select_and_group(). */
    DBUG_ASSERT(*ref && (*ref)->fixed);
    /*
      Here, a subset of actions performed by Item_ref::set_properties
      is not enough. So we pass ptr to NULL into Item_[direct]_ref
      constructor, so no initialization is performed, and call 
      fix_fields() below.
    */
    save= *ref;
    *ref= NULL;                             // Don't call set_properties()
    rf= (place == IN_HAVING ?
         new Item_ref(context, ref, (char*) table_name,
unknown's avatar
unknown committed
3956
                      (char*) field_name, alias_name_used) :
3957
         (!select->group_list.elements ?
3958
         new Item_direct_ref(context, ref, (char*) table_name,
3959 3960 3961
                             (char*) field_name, alias_name_used) :
         new Item_outer_ref(context, ref, (char*) table_name,
                            (char*) field_name, alias_name_used)));
3962 3963 3964
    *ref= save;
    if (!rf)
      return -1;
3965 3966 3967 3968 3969 3970

    if (place != IN_HAVING && select->group_list.elements)
    {
      outer_context->select_lex->inner_refs_list.push_back((Item_outer_ref*)rf);
      ((Item_outer_ref*)rf)->in_sum_func= thd->lex->in_sum_func;
    }
3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988
    thd->change_item_tree(reference, rf);
    /*
      rf is Item_ref => never substitute other items (in this case)
      during fix_fields() => we can use rf after fix_fields()
    */
    DBUG_ASSERT(!rf->fixed);                // Assured by Item_ref()
    if (rf->fix_fields(thd, reference) || rf->check_cols(1))
      return -1;

    mark_as_dependent(thd, last_checked_context->select_lex,
                      context->select_lex, this,
                      rf);
    return 0;
  }
  else
  {
    mark_as_dependent(thd, last_checked_context->select_lex,
                      context->select_lex,
3989
                      this, (Item_ident*)*reference);
3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012
    if (last_checked_context->select_lex->having_fix_field)
    {
      Item_ref *rf;
      rf= new Item_ref(context,
                       (cached_table->db[0] ? cached_table->db : 0),
                       (char*) cached_table->alias, (char*) field_name);
      if (!rf)
        return -1;
      thd->change_item_tree(reference, rf);
      /*
        rf is Item_ref => never substitute other items (in this case)
        during fix_fields() => we can use rf after fix_fields()
      */
      DBUG_ASSERT(!rf->fixed);                // Assured by Item_ref()
      if (rf->fix_fields(thd, reference) || rf->check_cols(1))
        return -1;
      return 0;
    }
  }
  return 1;
}


unknown's avatar
unknown committed
4013
/**
4014 4015
  Resolve the name of a column reference.

unknown's avatar
unknown committed
4016 4017 4018
  The method resolves the column reference represented by 'this' as a column
  present in one of: FROM clause, SELECT clause, GROUP BY clause of a query
  Q, or in outer queries that contain Q.
4019

unknown's avatar
unknown committed
4020 4021
  The name resolution algorithm used is (where [T_j] is an optional table
  name that qualifies the column name):
4022

unknown's avatar
unknown committed
4023 4024 4025 4026 4027
  @code
    resolve_column_reference([T_j].col_ref_i)
    {
      search for a column or derived column named col_ref_i
      [in table T_j] in the FROM clause of Q;
4028

unknown's avatar
unknown committed
4029 4030
      if such a column is NOT found AND    // Lookup in outer queries.
         there are outer queries
4031
      {
unknown's avatar
unknown committed
4032
        for each outer query Q_k beginning from the inner-most one
4033
        {
unknown's avatar
unknown committed
4034 4035
          search for a column or derived column named col_ref_i
          [in table T_j] in the FROM clause of Q_k;
4036

unknown's avatar
unknown committed
4037 4038 4039
          if such a column is not found
            Search for a column or derived column named col_ref_i
            [in table T_j] in the SELECT and GROUP clauses of Q_k.
4040 4041
        }
      }
unknown's avatar
unknown committed
4042 4043
    }
  @endcode
4044 4045 4046 4047

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

unknown's avatar
unknown committed
4048 4049 4050 4051 4052
  @param[in]     thd        current thread
  @param[in,out] reference  view column if this item was resolved to a
    view column

  @retval
4053
    TRUE  if error
unknown's avatar
unknown committed
4054
  @retval
4055 4056 4057
    FALSE on success
*/

4058
bool Item_field::fix_fields(THD *thd, Item **reference)
unknown's avatar
unknown committed
4059
{
unknown's avatar
unknown committed
4060
  DBUG_ASSERT(fixed == 0);
4061 4062 4063
  Field *from_field= (Field *)not_found_field;
  bool outer_fixed= false;

4064
  if (!field)					// If field is not checked
unknown's avatar
unknown committed
4065
  {
4066 4067 4068 4069 4070
    /*
      In case of view, find_field_in_tables() write pointer to view field
      expression to 'reference', i.e. it substitute that expression instead
      of this Item_field
    */
unknown's avatar
unknown committed
4071 4072 4073
    if ((from_field= find_field_in_tables(thd, this,
                                          context->first_name_resolution_table,
                                          context->last_name_resolution_table,
4074
                                          reference,
4075 4076 4077
                                          thd->lex->use_only_table_context ?
                                            REPORT_ALL_ERRORS : 
                                            IGNORE_EXCEPT_NON_UNIQUE,
4078
                                          !any_privileges,
4079
                                          TRUE)) ==
4080
	not_found_field)
4081
    {
4082
      int ret;
unknown's avatar
unknown committed
4083 4084 4085 4086
      /* Look up in current select's item_list to find aliased fields */
      if (thd->lex->current_select->is_item_list_lookup)
      {
        uint counter;
unknown's avatar
unknown committed
4087
        enum_resolution_type resolution;
unknown's avatar
unknown committed
4088 4089
        Item** res= find_item_in_list(this, thd->lex->current_select->item_list,
                                      &counter, REPORT_EXCEPT_NOT_FOUND,
unknown's avatar
unknown committed
4090
                                      &resolution);
4091 4092
        if (!res)
          return 1;
unknown's avatar
unknown committed
4093 4094
        if (resolution == RESOLVED_AGAINST_ALIAS)
          alias_name_used= TRUE;
4095
        if (res != (Item **)not_found_item)
unknown's avatar
unknown committed
4096
        {
4097 4098 4099
          if ((*res)->type() == Item::FIELD_ITEM)
          {
            /*
4100 4101 4102 4103
              It's an Item_field referencing another Item_field in the select
              list.
              Use the field from the Item_field in the select list and leave
              the Item_field instance in place.
4104
            */
4105

4106
            Field *new_field= (*((Item_field**)res))->field;
4107

4108
            if (new_field == NULL)
4109 4110 4111 4112 4113 4114 4115
            {
              /* The column to which we link isn't valid. */
              my_error(ER_BAD_FIELD_ERROR, MYF(0), (*res)->name, 
                       current_thd->where);
              return(1);
            }

4116
            set_field(new_field);
4117 4118 4119 4120 4121 4122 4123 4124 4125
            return 0;
          }
          else
          {
            /*
              It's not an Item_field in the select list so we must make a new
              Item_ref to point to the Item in the select list and replace the
              Item_field created by the parser with the new Item_ref.
            */
unknown's avatar
unknown committed
4126
            Item_ref *rf= new Item_ref(context, db_name,table_name,field_name);
4127 4128
            if (!rf)
              return 1;
unknown's avatar
unknown committed
4129
            thd->change_item_tree(reference, rf);
4130 4131 4132 4133 4134
            /*
              Because Item_ref never substitutes itself with other items 
              in Item_ref::fix_fields(), we can safely use the original 
              pointer to it even after fix_fields()
             */
unknown's avatar
unknown committed
4135
            return rf->fix_fields(thd, reference) ||  rf->check_cols(1);
4136
          }
4137 4138
        }
      }
4139 4140 4141
      if ((ret= fix_outer_field(thd, &from_field, reference)) < 0)
        goto error;
      outer_fixed= TRUE;
4142 4143
      if (!ret)
        goto mark_non_agg_field;
4144
    }
4145
    else if (!from_field)
4146
      goto error;
4147

4148
    if (!outer_fixed && cached_table && cached_table->select_lex &&
4149 4150
        context->select_lex &&
        cached_table->select_lex != context->select_lex)
4151 4152 4153 4154 4155
    {
      int ret;
      if ((ret= fix_outer_field(thd, &from_field, reference)) < 0)
        goto error;
      outer_fixed= 1;
4156 4157
      if (!ret)
        goto mark_non_agg_field;
4158 4159
    }

unknown's avatar
VIEW  
unknown committed
4160 4161 4162 4163
    /*
      if it is not expression from merged VIEW we will set this field.

      We can leave expression substituted from view for next PS/SP rexecution
4164
      (i.e. do not register this substitution for reverting on cleanup()
unknown's avatar
VIEW  
unknown committed
4165
      (register_item_tree_changing())), because this subtree will be
4166
      fix_field'ed during setup_tables()->setup_underlying() (i.e. before
unknown's avatar
VIEW  
unknown committed
4167 4168 4169 4170 4171
      all other expressions of query, and references on tables which do
      not present in query will not make problems.

      Also we suppose that view can't be changed during PS/SP life.
    */
4172 4173 4174 4175
    if (from_field == view_ref_found)
      return FALSE;

    set_field(from_field);
unknown's avatar
unknown committed
4176 4177 4178 4179 4180
    if (thd->lex->in_sum_func &&
        thd->lex->in_sum_func->nest_level == 
        thd->lex->current_select->nest_level)
      set_if_bigger(thd->lex->in_sum_func->max_arg_level,
                    thd->lex->current_select->nest_level);
unknown's avatar
unknown committed
4181
  }
4182
  else if (thd->mark_used_columns != MARK_COLUMNS_NONE)
4183
  {
4184
    TABLE *table= field->table;
4185 4186
    MY_BITMAP *current_bitmap, *other_bitmap;
    if (thd->mark_used_columns == MARK_COLUMNS_READ)
4187
    {
4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201
      current_bitmap= table->read_set;
      other_bitmap=   table->write_set;
    }
    else
    {
      current_bitmap= table->write_set;
      other_bitmap=   table->read_set;
    }
    if (!bitmap_fast_test_and_set(current_bitmap, field->field_index))
    {
      if (!bitmap_is_set(other_bitmap, field->field_index))
      {
        /* First usage of column */
        table->used_fields++;                     // Used to optimize loops
4202
        /* purecov: begin inspected */
4203
        table->covering_keys.intersect(field->part_of_key);
4204
        /* purecov: end */
4205
      }
4206
    }
4207
  }
unknown's avatar
VIEW  
unknown committed
4208 4209 4210 4211
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (any_privileges)
  {
    char *db, *tab;
4212 4213
    db= cached_table->get_db_name();
    tab= cached_table->get_table_name();
unknown's avatar
VIEW  
unknown committed
4214 4215 4216 4217
    if (!(have_privileges= (get_column_grant(thd, &field->table->grant,
                                             db, tab, field_name) &
                            VIEW_ANY_ACL)))
    {
4218
      my_error(ER_COLUMNACCESS_DENIED_ERROR, MYF(0),
4219 4220
               "ANY", thd->security_ctx->priv_user,
               thd->security_ctx->host_or_ip, field_name, tab);
4221
      goto error;
unknown's avatar
VIEW  
unknown committed
4222 4223 4224
    }
  }
#endif
4225
  fixed= 1;
4226 4227 4228 4229 4230 4231 4232
  if (thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY &&
      !outer_fixed && !thd->lex->in_sum_func &&
      thd->lex->current_select->cur_pos_in_select_list != UNDEF_POS)
  {
    thd->lex->current_select->non_agg_fields.push_back(this);
    marker= thd->lex->current_select->cur_pos_in_select_list;
  }
4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252
mark_non_agg_field:
  if (fixed && thd->variables.sql_mode & MODE_ONLY_FULL_GROUP_BY)
  {
    /*
      Mark selects according to presence of non aggregated fields.
      Fields from outer selects added to the aggregate function
      outer_fields list as its unknown at the moment whether it's
      aggregated or not.
    */
    if (!thd->lex->in_sum_func)
      cached_table->select_lex->full_group_by_flag|= NON_AGG_FIELD_USED;
    else
    {
      if (outer_fixed)
        thd->lex->in_sum_func->outer_fields.push_back(this);
      else if (thd->lex->in_sum_func->nest_level !=
          thd->lex->current_select->nest_level)
        cached_table->select_lex->full_group_by_flag|= NON_AGG_FIELD_USED;
    }
  }
4253
  return FALSE;
4254 4255 4256 4257

error:
  context->process_error(thd);
  return TRUE;
unknown's avatar
unknown committed
4258 4259
}

4260 4261 4262 4263 4264 4265 4266 4267

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


unknown's avatar
unknown committed
4268 4269
void Item_field::cleanup()
{
unknown's avatar
unknown committed
4270
  DBUG_ENTER("Item_field::cleanup");
unknown's avatar
unknown committed
4271
  Item_ident::cleanup();
4272 4273
  /*
    Even if this object was created by direct link to field in setup_wild()
unknown's avatar
unknown committed
4274
    it will be linked correctly next time by name of field and table alias.
4275 4276
    I.e. we can drop 'field'.
   */
4277
  field= result_field= 0;
4278
  null_value= FALSE;
4279
  DBUG_VOID_RETURN;
4280
}
unknown's avatar
unknown committed
4281

unknown's avatar
unknown committed
4282 4283
/**
  Find a field among specified multiple equalities.
unknown's avatar
unknown committed
4284

unknown's avatar
unknown committed
4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297
  The function first searches the field among multiple equalities
  of the current level (in the cond_equal->current_level list).
  If it fails, it continues searching in upper levels accessed
  through a pointer cond_equal->upper_levels.
  The search terminates as soon as a multiple equality containing 
  the field is found. 

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

  @return
    - First Item_equal containing the field, if success
    - 0, otherwise
unknown's avatar
unknown committed
4298
*/
unknown's avatar
unknown committed
4299

unknown's avatar
unknown committed
4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320
Item_equal *Item_field::find_item_equal(COND_EQUAL *cond_equal)
{
  Item_equal *item= 0;
  while (cond_equal)
  {
    List_iterator_fast<Item_equal> li(cond_equal->current_level);
    while ((item= li++))
    {
      if (item->contains(field))
        return item;
    }
    /* 
      The field is not found in any of the multiple equalities
      of the current level. Look for it in upper levels
    */
    cond_equal= cond_equal->upper_levels;
  }
  return 0;
}


unknown's avatar
unknown committed
4321 4322
/**
  Check whether a field can be substituted by an equal item.
4323

unknown's avatar
unknown committed
4324 4325
  The function checks whether a substitution of the field
  occurrence for an equal item is valid.
4326

unknown's avatar
unknown committed
4327 4328 4329 4330
  @param arg   *arg != NULL <-> the field is in the context where
               substitution for an equal item is valid

  @note
4331
    The following statement is not always true:
unknown's avatar
unknown committed
4332
  @n
4333
    x=y => F(x)=F(x/y).
unknown's avatar
unknown committed
4334
  @n
4335
    This means substitution of an item for an equal item not always
unknown's avatar
unknown committed
4336 4337 4338 4339 4340
    yields an equavalent condition. Here's an example:
    @code
    'a'='a '
    (LENGTH('a')=1) != (LENGTH('a ')=2)
  @endcode
4341 4342
    Such a substitution is surely valid if either the substituted
    field is not of a STRING type or if it is an argument of
unknown's avatar
unknown committed
4343
    a comparison predicate.
4344

unknown's avatar
unknown committed
4345
  @retval
4346
    TRUE   substitution is valid
unknown's avatar
unknown committed
4347
  @retval
4348 4349 4350
    FALSE  otherwise
*/

4351
bool Item_field::subst_argument_checker(uchar **arg)
4352 4353 4354 4355 4356
{
  return (result_type() != STRING_RESULT) || (*arg);
}


4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374
/**
  Convert a numeric value to a zero-filled string

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

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

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

  res= (*item)->val_str(&tmp);
4375 4376 4377 4378 4379 4380 4381 4382
  if ((*item)->is_null())
    *item= new Item_null();
  else
  {
    field->prepend_zeros(res);
    pos= (char *) sql_strmake (res->ptr(), res->length());
    *item= new Item_string(pos, res->length(), field->charset());
  }
4383 4384 4385
}


unknown's avatar
unknown committed
4386
/**
4387
  Set a pointer to the multiple equality the field reference belongs to
unknown's avatar
unknown committed
4388
  (if any).
unknown's avatar
unknown committed
4389

unknown's avatar
unknown committed
4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401
  The function looks for a multiple equality containing the field item
  among those referenced by arg.
  In the case such equality exists the function does the following.
  If the found multiple equality contains a constant, then the field
  reference is substituted for this constant, otherwise it sets a pointer
  to the multiple equality in the field item.


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

  @note
unknown's avatar
unknown committed
4402
    This function is supposed to be called as a callback parameter in calls
unknown's avatar
unknown committed
4403
    of the compile method.
unknown's avatar
unknown committed
4404

unknown's avatar
unknown committed
4405 4406 4407
  @return
    - pointer to the replacing constant item, if the field item was substituted
    - pointer to the field item, otherwise.
unknown's avatar
unknown committed
4408
*/
unknown's avatar
unknown committed
4409

4410
Item *Item_field::equal_fields_propagator(uchar *arg)
unknown's avatar
unknown committed
4411 4412 4413 4414 4415 4416 4417
{
  if (no_const_subst)
    return this;
  item_equal= find_item_equal((COND_EQUAL *) arg);
  Item *item= 0;
  if (item_equal)
    item= item_equal->get_const();
4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428
  /*
    Disable const propagation for items used in different comparison contexts.
    This must be done because, for example, Item_hex_string->val_int() is not
    the same as (Item_hex_string->val_str() in BINARY column)->val_int().
    We cannot simply disable the replacement in a particular context (
    e.g. <bin_col> = <int_col> AND <bin_col> = <hex_string>) since
    Items don't know the context they are in and there are functions like 
    IF (<hex_string>, 'yes', 'no').
    The same problem occurs when comparing a DATE/TIME field with a
    DATE/TIME represented as an int and as a string.
  */
unknown's avatar
unknown committed
4429
  if (!item ||
4430
      (cmp_context != IMPOSSIBLE_RESULT && item->cmp_context != cmp_context))
unknown's avatar
unknown committed
4431
    item= this;
4432 4433
  else if (field && (field->flags & ZEROFILL_FLAG) && IS_NUM(field->type()))
  {
4434 4435 4436 4437 4438 4439
    /*
      We don't need to zero-fill timestamp columns here because they will be 
      first converted to a string (in date/time format) and compared as such if
      compared with another string.
    */
    if (item && field->type() != FIELD_TYPE_TIMESTAMP && cmp_context != INT_RESULT)
4440 4441 4442 4443
      convert_zerofill_number_to_string(&item, (Field_num *)field);
    else
      item= this;
  }
unknown's avatar
unknown committed
4444 4445 4446 4447
  return item;
}


unknown's avatar
unknown committed
4448 4449 4450 4451
/**
  Mark the item to not be part of substitution if it's not a binary item.

  See comments in Arg_comparator::set_compare_func() for details.
4452 4453
*/

4454
bool Item_field::set_no_const_sub(uchar *arg)
4455 4456 4457
{
  if (field->charset() != &my_charset_bin)
    no_const_subst=1;
4458
  return FALSE;
4459 4460 4461
}


unknown's avatar
unknown committed
4462
/**
unknown's avatar
unknown committed
4463
  Replace an Item_field for an equal Item_field that evaluated earlier
unknown's avatar
unknown committed
4464
  (if any).
unknown's avatar
unknown committed
4465

unknown's avatar
unknown committed
4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477
  The function returns a pointer to an item that is taken from
  the very beginning of the item_equal list which the Item_field
  object refers to (belongs to) unless item_equal contains  a constant
  item. In this case the function returns this constant item, 
  (if the substitution does not require conversion).   
  If the Item_field object does not refer any Item_equal object
  'this' is returned .

  @param arg   a dummy parameter, is not used here


  @note
unknown's avatar
unknown committed
4478
    This function is supposed to be called as a callback parameter in calls
unknown's avatar
unknown committed
4479
    of the thransformer method.
unknown's avatar
unknown committed
4480

unknown's avatar
unknown committed
4481 4482 4483 4484
  @return
    - pointer to a replacement Item_field if there is a better equal item or
      a pointer to a constant equal item;
    - this - otherwise.
unknown's avatar
unknown committed
4485 4486
*/

4487
Item *Item_field::replace_equal_field(uchar *arg)
unknown's avatar
unknown committed
4488 4489 4490
{
  if (item_equal)
  {
4491 4492 4493
    Item *const_item= item_equal->get_const();
    if (const_item)
    {
4494
      if (cmp_context != IMPOSSIBLE_RESULT &&
4495 4496 4497 4498
          const_item->cmp_context != cmp_context)
        return this;
      return const_item;
    }
unknown's avatar
unknown committed
4499
    Item_field *subst= item_equal->get_first();
unknown's avatar
unknown committed
4500
    if (subst && !field->eq(subst->field))
unknown's avatar
unknown committed
4501
      return subst;
unknown's avatar
unknown committed
4502
  }
unknown's avatar
unknown committed
4503
  return this;
unknown's avatar
unknown committed
4504
}
unknown's avatar
unknown committed
4505

4506

unknown's avatar
unknown committed
4507
void Item::init_make_field(Send_field *tmp_field,
4508
			   enum enum_field_types field_type_arg)
4509
{
4510
  char *empty_name= (char*) "";
4511
  tmp_field->db_name=		empty_name;
4512 4513 4514 4515
  tmp_field->org_table_name=	empty_name;
  tmp_field->org_col_name=	empty_name;
  tmp_field->table_name=	empty_name;
  tmp_field->col_name=		name;
4516
  tmp_field->charsetnr=         collation.collation->number;
4517 4518 4519
  tmp_field->flags=             (maybe_null ? 0 : NOT_NULL_FLAG) | 
                                (my_binary_compare(collation.collation) ?
                                 BINARY_FLAG : 0);
4520
  tmp_field->type=              field_type_arg;
unknown's avatar
unknown committed
4521 4522
  tmp_field->length=max_length;
  tmp_field->decimals=decimals;
4523 4524
  if (unsigned_flag)
    tmp_field->flags |= UNSIGNED_FLAG;
unknown's avatar
unknown committed
4525 4526
}

4527
void Item::make_field(Send_field *tmp_field)
unknown's avatar
unknown committed
4528
{
4529
  init_make_field(tmp_field, field_type());
unknown's avatar
unknown committed
4530 4531 4532
}


4533
enum_field_types Item::string_field_type() const
4534
{
unknown's avatar
unknown committed
4535
  enum_field_types f_type= MYSQL_TYPE_VAR_STRING;
4536
  if (max_length >= 16777216)
unknown's avatar
unknown committed
4537
    f_type= MYSQL_TYPE_LONG_BLOB;
4538
  else if (max_length >= 65536)
unknown's avatar
unknown committed
4539
    f_type= MYSQL_TYPE_MEDIUM_BLOB;
unknown's avatar
unknown committed
4540
  return f_type;
4541 4542 4543 4544 4545 4546
}


void Item_empty_string::make_field(Send_field *tmp_field)
{
  init_make_field(tmp_field, string_field_type());
4547 4548
}

unknown's avatar
unknown committed
4549

4550
enum_field_types Item::field_type() const
unknown's avatar
unknown committed
4551
{
4552
  switch (result_type()) {
4553
  case STRING_RESULT:  return string_field_type();
4554 4555 4556
  case INT_RESULT:     return MYSQL_TYPE_LONGLONG;
  case DECIMAL_RESULT: return MYSQL_TYPE_NEWDECIMAL;
  case REAL_RESULT:    return MYSQL_TYPE_DOUBLE;
unknown's avatar
unknown committed
4557 4558 4559
  case ROW_RESULT:
  default:
    DBUG_ASSERT(0);
4560 4561
    return MYSQL_TYPE_VARCHAR;
  }
unknown's avatar
unknown committed
4562 4563
}

4564

4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579
bool Item::is_datetime()
{
  switch (field_type())
  {
    case MYSQL_TYPE_DATE:
    case MYSQL_TYPE_DATETIME:
    case MYSQL_TYPE_TIMESTAMP:
      return TRUE;
    default:
      break;
  }
  return FALSE;
}


4580
String *Item::check_well_formed_result(String *str, bool send_error)
4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595
{
  /* Check whether we got a well-formed string */
  CHARSET_INFO *cs= str->charset();
  int well_formed_error;
  uint wlen= cs->cset->well_formed_len(cs,
                                       str->ptr(), str->ptr() + str->length(),
                                       str->length(), &well_formed_error);
  if (wlen < str->length())
  {
    THD *thd= current_thd;
    char hexbuf[7];
    enum MYSQL_ERROR::enum_warning_level level;
    uint diff= str->length() - wlen;
    set_if_smaller(diff, 3);
    octet2hex(hexbuf, str->ptr() + wlen, diff);
4596 4597 4598 4599 4600 4601 4602 4603
    if (send_error)
    {
      my_error(ER_INVALID_CHARACTER_STRING, MYF(0),
               cs->csname,  hexbuf);
      return 0;
    }
    if ((thd->variables.sql_mode &
         (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES)))
4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619
    {
      level= MYSQL_ERROR::WARN_LEVEL_ERROR;
      null_value= 1;
      str= 0;
    }
    else
    {
      level= MYSQL_ERROR::WARN_LEVEL_WARN;
      str->length(wlen);
    }
    push_warning_printf(thd, level, ER_INVALID_CHARACTER_STRING,
                        ER(ER_INVALID_CHARACTER_STRING), cs->csname, hexbuf);
  }
  return str;
}

unknown's avatar
unknown committed
4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662
/*
  Compare two items using a given collation
  
  SYNOPSIS
    eq_by_collation()
    item               item to compare with
    binary_cmp         TRUE <-> compare as binaries
    cs                 collation to use when comparing strings

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

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

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

4663

unknown's avatar
unknown committed
4664 4665
/**
  Create a field to hold a string value from an item.
4666

unknown's avatar
unknown committed
4667 4668 4669
  If max_length > CONVERT_IF_BIGGER_TO_BLOB create a blob @n
  If max_length > 0 create a varchar @n
  If max_length == 0 create a CHAR(0) 
4670

unknown's avatar
unknown committed
4671
  @param table		Table for which the field is created
4672 4673 4674 4675
*/

Field *Item::make_string_field(TABLE *table)
{
unknown's avatar
unknown committed
4676
  Field *field;
4677 4678
  DBUG_ASSERT(collation.collation);
  if (max_length/collation.collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB)
unknown's avatar
unknown committed
4679
    field= new Field_blob(max_length, maybe_null, name,
4680
                          collation.collation);
4681
  /* Item_type_holder holds the exact type, do not change it */
4682
  else if (max_length > 0 &&
4683
      (type() != Item::TYPE_HOLDER || field_type() != MYSQL_TYPE_STRING))
unknown's avatar
unknown committed
4684
    field= new Field_varstring(max_length, maybe_null, name, table->s,
4685
                               collation.collation);
unknown's avatar
unknown committed
4686 4687 4688 4689 4690 4691
  else
    field= new Field_string(max_length, maybe_null, name,
                            collation.collation);
  if (field)
    field->init(table);
  return field;
4692 4693 4694
}


unknown's avatar
unknown committed
4695 4696
/**
  Create a field based on field_type of argument.
4697 4698

  For now, this is only used to create a field for
unknown's avatar
unknown committed
4699
  IFNULL(x,something) and time functions
4700

unknown's avatar
unknown committed
4701 4702 4703 4704
  @retval
    NULL  error
  @retval
    \#    Created field
4705 4706
*/

unknown's avatar
unknown committed
4707
Field *Item::tmp_table_field_from_field_type(TABLE *table, bool fixed_length)
4708
{
4709 4710 4711 4712
  /*
    The field functions defines a field to be not null if null_ptr is not 0
  */
  uchar *null_ptr= maybe_null ? (uchar*) "" : 0;
unknown's avatar
unknown committed
4713
  Field *field;
4714 4715

  switch (field_type()) {
4716
  case MYSQL_TYPE_DECIMAL:
unknown's avatar
unknown committed
4717
  case MYSQL_TYPE_NEWDECIMAL:
4718
    field= new Field_new_decimal((uchar*) 0, max_length, null_ptr, 0,
unknown's avatar
unknown committed
4719
                                 Field::NONE, name, decimals, 0,
unknown's avatar
unknown committed
4720
                                 unsigned_flag);
unknown's avatar
unknown committed
4721
    break;
4722
  case MYSQL_TYPE_TINY:
4723
    field= new Field_tiny((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
4724 4725
			  name, 0, unsigned_flag);
    break;
4726
  case MYSQL_TYPE_SHORT:
4727
    field= new Field_short((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
4728 4729
			   name, 0, unsigned_flag);
    break;
4730
  case MYSQL_TYPE_LONG:
4731
    field= new Field_long((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
4732 4733
			  name, 0, unsigned_flag);
    break;
4734 4735
#ifdef HAVE_LONG_LONG
  case MYSQL_TYPE_LONGLONG:
4736
    field= new Field_longlong((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
4737 4738
			      name, 0, unsigned_flag);
    break;
4739
#endif
4740
  case MYSQL_TYPE_FLOAT:
4741
    field= new Field_float((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
4742 4743
			   name, decimals, 0, unsigned_flag);
    break;
4744
  case MYSQL_TYPE_DOUBLE:
4745
    field= new Field_double((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
4746 4747
			    name, decimals, 0, unsigned_flag);
    break;
4748
  case MYSQL_TYPE_NULL:
4749
    field= new Field_null((uchar*) 0, max_length, Field::NONE,
unknown's avatar
unknown committed
4750 4751
			  name, &my_charset_bin);
    break;
4752
  case MYSQL_TYPE_INT24:
4753
    field= new Field_medium((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
4754 4755
			    name, 0, unsigned_flag);
    break;
4756
  case MYSQL_TYPE_NEWDATE:
4757
  case MYSQL_TYPE_DATE:
4758
    field= new Field_newdate(maybe_null, name, &my_charset_bin);
unknown's avatar
unknown committed
4759
    break;
4760
  case MYSQL_TYPE_TIME:
unknown's avatar
unknown committed
4761 4762
    field= new Field_time(maybe_null, name, &my_charset_bin);
    break;
4763
  case MYSQL_TYPE_TIMESTAMP:
unknown's avatar
unknown committed
4764 4765
    field= new Field_timestamp(maybe_null, name, &my_charset_bin);
    break;
4766
  case MYSQL_TYPE_DATETIME:
unknown's avatar
unknown committed
4767 4768
    field= new Field_datetime(maybe_null, name, &my_charset_bin);
    break;
4769
  case MYSQL_TYPE_YEAR:
4770
    field= new Field_year((uchar*) 0, max_length, null_ptr, 0, Field::NONE,
unknown's avatar
unknown committed
4771 4772
			  name);
    break;
unknown's avatar
unknown committed
4773
  case MYSQL_TYPE_BIT:
4774
    field= new Field_bit_as_char(NULL, max_length, null_ptr, 0,
unknown's avatar
unknown committed
4775 4776
                                 Field::NONE, name);
    break;
4777
  default:
4778
    /* This case should never be chosen */
4779 4780
    DBUG_ASSERT(0);
    /* If something goes awfully wrong, it's better to get a string than die */
unknown's avatar
unknown committed
4781 4782 4783 4784 4785 4786 4787 4788
  case MYSQL_TYPE_STRING:
    if (fixed_length && max_length < CONVERT_IF_BIGGER_TO_BLOB)
    {
      field= new Field_string(max_length, maybe_null, name,
                              collation.collation);
      break;
    }
    /* Fall through to make_string_field() */
4789 4790
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
4791
  case MYSQL_TYPE_VAR_STRING:
4792
  case MYSQL_TYPE_VARCHAR:
4793
    return make_string_field(table);
4794 4795 4796 4797
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
4798
    if (this->type() == Item::TYPE_HOLDER)
unknown's avatar
unknown committed
4799 4800
      field= new Field_blob(max_length, maybe_null, name, collation.collation,
                            1);
4801
    else
unknown's avatar
unknown committed
4802
      field= new Field_blob(max_length, maybe_null, name, collation.collation);
4803
    break;					// Blob handled outside of case
4804
#ifdef HAVE_SPATIAL
unknown's avatar
unknown committed
4805
  case MYSQL_TYPE_GEOMETRY:
4806 4807
    field= new Field_geom(max_length, maybe_null,
                          name, table->s, get_geometry_type());
4808
#endif /* HAVE_SPATIAL */
4809
  }
unknown's avatar
unknown committed
4810 4811 4812
  if (field)
    field->init(table);
  return field;
4813 4814
}

4815

4816 4817
/* ARGSUSED */
void Item_field::make_field(Send_field *tmp_field)
unknown's avatar
unknown committed
4818
{
4819
  field->make_field(tmp_field);
4820
  DBUG_ASSERT(tmp_field->table_name != 0);
4821 4822
  if (name)
    tmp_field->col_name=name;			// Use user supplied name
4823 4824 4825 4826
  if (table_name)
    tmp_field->table_name= table_name;
  if (db_name)
    tmp_field->db_name= db_name;
unknown's avatar
unknown committed
4827 4828
}

4829

unknown's avatar
unknown committed
4830 4831
/**
  Set a field's value from a item.
unknown's avatar
unknown committed
4832 4833 4834 4835 4836 4837 4838
*/

void Item_field::save_org_in_field(Field *to)
{
  if (field->is_null())
  {
    null_value=1;
4839
    set_field_to_null_with_conversions(to, 1);
unknown's avatar
unknown committed
4840 4841 4842 4843 4844 4845 4846 4847 4848
  }
  else
  {
    to->set_notnull();
    field_conv(to,field);
    null_value=0;
  }
}

unknown's avatar
unknown committed
4849
int Item_field::save_in_field(Field *to, bool no_conversions)
unknown's avatar
unknown committed
4850
{
4851
  int res;
unknown's avatar
unknown committed
4852 4853 4854
  if (result_field->is_null())
  {
    null_value=1;
4855
    res= set_field_to_null_with_conversions(to, no_conversions);
unknown's avatar
unknown committed
4856 4857 4858 4859
  }
  else
  {
    to->set_notnull();
4860
    res= field_conv(to,result_field);
unknown's avatar
unknown committed
4861 4862
    null_value=0;
  }
4863
  return res;
unknown's avatar
unknown committed
4864 4865
}

4866

unknown's avatar
unknown committed
4867 4868
/**
  Store null in field.
unknown's avatar
unknown committed
4869

unknown's avatar
unknown committed
4870 4871
  This is used on INSERT.
  Allow NULL to be inserted in timestamp and auto_increment values.
unknown's avatar
unknown committed
4872

unknown's avatar
unknown committed
4873
  @param field		Field where we want to store NULL
unknown's avatar
unknown committed
4874

unknown's avatar
unknown committed
4875 4876 4877 4878 4879
  @retval
    0   ok
  @retval
    1   Field doesn't support NULL values and can't handle 'field = NULL'
*/
unknown's avatar
unknown committed
4880

unknown's avatar
unknown committed
4881
int Item_null::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
4882
{
4883
  return set_field_to_null_with_conversions(field, no_conversions);
unknown's avatar
unknown committed
4884 4885 4886
}


unknown's avatar
unknown committed
4887 4888
/**
  Store null in field.
4889

unknown's avatar
unknown committed
4890
  @param field		Field where we want to store NULL
4891

unknown's avatar
unknown committed
4892
  @retval
unknown's avatar
unknown committed
4893
    0	 OK
unknown's avatar
unknown committed
4894
  @retval
4895
    1	 Field doesn't support NULL values
unknown's avatar
unknown committed
4896
*/
4897

unknown's avatar
unknown committed
4898
int Item_null::save_safe_in_field(Field *field)
unknown's avatar
unknown committed
4899 4900 4901 4902 4903
{
  return set_field_to_null(field);
}


4904 4905 4906 4907 4908 4909
/*
  This implementation can lose str_value content, so if the
  Item uses str_value to store something, it should
  reimplement it's ::save_in_field() as Item_string, for example, does
*/

unknown's avatar
unknown committed
4910
int Item::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
4911
{
4912
  int error;
unknown's avatar
unknown committed
4913
  if (result_type() == STRING_RESULT ||
4914 4915
      (result_type() == REAL_RESULT &&
       field->result_type() == STRING_RESULT))
unknown's avatar
unknown committed
4916 4917
  {
    String *result;
4918
    CHARSET_INFO *cs= collation.collation;
unknown's avatar
unknown committed
4919
    char buff[MAX_FIELD_WIDTH];		// Alloc buffer for small columns
unknown's avatar
unknown committed
4920
    str_value.set_quick(buff, sizeof(buff), cs);
unknown's avatar
unknown committed
4921 4922
    result=val_str(&str_value);
    if (null_value)
4923
    {
unknown's avatar
unknown committed
4924
      str_value.set_quick(0, 0, cs);
4925
      return set_field_to_null_with_conversions(field, no_conversions);
4926
    }
4927 4928 4929

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

unknown's avatar
unknown committed
4930
    field->set_notnull();
4931
    error=field->store(result->ptr(),result->length(),cs);
4932
    str_value.set_quick(0, 0, cs);
unknown's avatar
unknown committed
4933 4934 4935
  }
  else if (result_type() == REAL_RESULT)
  {
4936
    double nr= val_real();
unknown's avatar
unknown committed
4937 4938 4939
    if (null_value)
      return set_field_to_null(field);
    field->set_notnull();
4940
    error=field->store(nr);
unknown's avatar
unknown committed
4941
  }
unknown's avatar
unknown committed
4942 4943 4944 4945 4946
  else if (result_type() == DECIMAL_RESULT)
  {
    my_decimal decimal_value;
    my_decimal *value= val_decimal(&decimal_value);
    if (null_value)
unknown's avatar
unknown committed
4947
      return set_field_to_null_with_conversions(field, no_conversions);
unknown's avatar
unknown committed
4948 4949 4950
    field->set_notnull();
    error=field->store_decimal(value);
  }
unknown's avatar
unknown committed
4951 4952 4953 4954
  else
  {
    longlong nr=val_int();
    if (null_value)
4955
      return set_field_to_null_with_conversions(field, no_conversions);
unknown's avatar
unknown committed
4956
    field->set_notnull();
4957
    error=field->store(nr, unsigned_flag);
unknown's avatar
unknown committed
4958
  }
unknown's avatar
unknown committed
4959
  return error;
unknown's avatar
unknown committed
4960 4961
}

4962

unknown's avatar
unknown committed
4963
int Item_string::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
4964 4965 4966
{
  String *result;
  result=val_str(&str_value);
4967
  return save_str_value_in_field(field, result);
unknown's avatar
unknown committed
4968 4969
}

4970

unknown's avatar
unknown committed
4971
int Item_uint::save_in_field(Field *field, bool no_conversions)
4972
{
4973
  /* Item_int::save_in_field handles both signed and unsigned. */
unknown's avatar
unknown committed
4974
  return Item_int::save_in_field(field, no_conversions);
4975 4976
}

unknown's avatar
unknown committed
4977 4978

int Item_int::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
4979 4980 4981 4982 4983
{
  longlong nr=val_int();
  if (null_value)
    return set_field_to_null(field);
  field->set_notnull();
4984
  return field->store(nr, unsigned_flag);
unknown's avatar
unknown committed
4985 4986
}

unknown's avatar
unknown committed
4987 4988 4989 4990 4991 4992 4993 4994

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


4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010
bool Item_int::eq(const Item *arg, bool binary_cmp) const
{
  /* No need to check for null value as basic constant can't be NULL */
  if (arg->basic_const_item() && arg->type() == type())
  {
    /*
      We need to cast off const to call val_int(). This should be OK for
      a basic constant.
    */
    Item *item= (Item*) arg;
    return item->val_int() == value && item->unsigned_flag == unsigned_flag;
  }
  return FALSE;
}


5011
Item *Item_int_with_ref::clone_item()
5012
{
5013
  DBUG_ASSERT(ref->const_item());
5014 5015 5016 5017 5018 5019 5020 5021 5022 5023
  /*
    We need to evaluate the constant to make sure it works with
    parameter markers.
  */
  return (ref->unsigned_flag ?
          new Item_uint(ref->name, ref->val_int(), ref->max_length) :
          new Item_int(ref->name, ref->val_int(), ref->max_length));
}


unknown's avatar
unknown committed
5024 5025
Item_num *Item_uint::neg()
{
5026
  Item_decimal *item= new Item_decimal(value, 1);
unknown's avatar
unknown committed
5027
  return item->neg();
unknown's avatar
unknown committed
5028
}
unknown's avatar
unknown committed
5029

unknown's avatar
unknown committed
5030

5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053
static uint nr_of_decimals(const char *str, const char *end)
{
  const char *decimal_point;

  /* Find position for '.' */
  for (;;)
  {
    if (str == end)
      return 0;
    if (*str == 'e' || *str == 'E')
      return NOT_FIXED_DEC;    
    if (*str++ == '.')
      break;
  }
  decimal_point= str;
  for (; my_isdigit(system_charset_info, *str) ; str++)
    ;
  if (*str == 'e' || *str == 'E')
    return NOT_FIXED_DEC;
  return (uint) (str - decimal_point);
}


unknown's avatar
unknown committed
5054
/**
unknown's avatar
unknown committed
5055 5056 5057 5058
  This function is only called during parsing. We will signal an error if
  value is not a true double value (overflow)
*/

unknown's avatar
unknown committed
5059
Item_float::Item_float(const char *str_arg, uint length)
unknown's avatar
unknown committed
5060 5061
{
  int error;
5062 5063 5064
  char *end_not_used;
  value= my_strntod(&my_charset_bin, (char*) str_arg, length, &end_not_used,
                    &error);
unknown's avatar
unknown committed
5065 5066 5067 5068 5069 5070 5071
  if (error)
  {
    /*
      Note that we depend on that str_arg is null terminated, which is true
      when we are in the parser
    */
    DBUG_ASSERT(str_arg[length] == 0);
5072
    my_error(ER_ILLEGAL_VALUE_FOR_TYPE, MYF(0), "double", (char*) str_arg);
unknown's avatar
unknown committed
5073 5074
  }
  presentation= name=(char*) str_arg;
5075
  decimals=(uint8) nr_of_decimals(str_arg, str_arg+length);
unknown's avatar
unknown committed
5076 5077 5078 5079 5080
  max_length=length;
  fixed= 1;
}


unknown's avatar
unknown committed
5081
int Item_float::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
5082
{
5083
  double nr= val_real();
unknown's avatar
unknown committed
5084 5085 5086
  if (null_value)
    return set_field_to_null(field);
  field->set_notnull();
unknown's avatar
unknown committed
5087
  return field->store(nr);
unknown's avatar
unknown committed
5088 5089
}

5090

5091
void Item_float::print(String *str, enum_query_type query_type)
5092 5093 5094 5095 5096 5097 5098 5099
{
  if (presentation)
  {
    str->append(presentation);
    return;
  }
  char buffer[20];
  String num(buffer, sizeof(buffer), &my_charset_bin);
5100
  num.set_real(value, decimals, &my_charset_bin);
5101 5102 5103 5104
  str->append(num);
}


unknown's avatar
unknown committed
5105 5106 5107 5108 5109
/*
  hex item
  In string context this is a binary string.
  In number context this is a longlong value.
*/
unknown's avatar
unknown committed
5110

5111
bool Item_float::eq(const Item *arg, bool binary_cmp) const
5112 5113 5114 5115 5116 5117 5118 5119
{
  if (arg->basic_const_item() && arg->type() == type())
  {
    /*
      We need to cast off const to call val_int(). This should be OK for
      a basic constant.
    */
    Item *item= (Item*) arg;
5120
    return item->val_real() == value;
5121 5122 5123 5124
  }
  return FALSE;
}

unknown's avatar
unknown committed
5125

unknown's avatar
unknown committed
5126
inline uint char_val(char X)
unknown's avatar
unknown committed
5127 5128 5129 5130 5131 5132
{
  return (uint) (X >= '0' && X <= '9' ? X-'0' :
		 X >= 'A' && X <= 'Z' ? X-'A'+10 :
		 X-'a'+10);
}

5133

unknown's avatar
unknown committed
5134
Item_hex_string::Item_hex_string(const char *str, uint str_length)
unknown's avatar
unknown committed
5135 5136 5137 5138 5139
{
  max_length=(str_length+1)/2;
  char *ptr=(char*) sql_alloc(max_length+1);
  if (!ptr)
    return;
unknown's avatar
unknown committed
5140
  str_value.set(ptr,max_length,&my_charset_bin);
unknown's avatar
unknown committed
5141 5142 5143 5144 5145 5146 5147 5148 5149
  char *end=ptr+max_length;
  if (max_length*2 != str_length)
    *ptr++=char_val(*str++);			// Not even, assume 0 prefix
  while (ptr != end)
  {
    *ptr++= (char) (char_val(str[0])*16+char_val(str[1]));
    str+=2;
  }
  *ptr=0;					// Keep purify happy
5150
  collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
unknown's avatar
unknown committed
5151
  fixed= 1;
unknown's avatar
unknown committed
5152
  unsigned_flag= 1;
unknown's avatar
unknown committed
5153 5154
}

unknown's avatar
unknown committed
5155
longlong Item_hex_string::val_int()
unknown's avatar
unknown committed
5156
{
unknown's avatar
unknown committed
5157
  // following assert is redundant, because fixed=1 assigned in constructor
5158
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
5159 5160 5161 5162 5163 5164 5165 5166 5167 5168
  char *end=(char*) str_value.ptr()+str_value.length(),
       *ptr=end-min(str_value.length(),sizeof(longlong));

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


unknown's avatar
unknown committed
5169 5170 5171 5172 5173 5174 5175 5176 5177 5178
my_decimal *Item_hex_string::val_decimal(my_decimal *decimal_value)
{
  // following assert is redundant, because fixed=1 assigned in constructor
  DBUG_ASSERT(fixed == 1);
  ulonglong value= (ulonglong)val_int();
  int2my_decimal(E_DEC_FATAL_ERROR, value, TRUE, decimal_value);
  return (decimal_value);
}


unknown's avatar
unknown committed
5179
int Item_hex_string::save_in_field(Field *field, bool no_conversions)
unknown's avatar
unknown committed
5180 5181 5182
{
  field->set_notnull();
  if (field->result_type() == STRING_RESULT)
5183 5184 5185 5186 5187
    return field->store(str_value.ptr(), str_value.length(), 
                        collation.collation);

  ulonglong nr;
  uint32 length= str_value.length();
5188 5189 5190
  if (!length)
    return 1;

5191
  if (length > 8)
unknown's avatar
unknown committed
5192
  {
5193 5194
    nr= field->flags & UNSIGNED_FLAG ? ULONGLONG_MAX : LONGLONG_MAX;
    goto warn;
unknown's avatar
unknown committed
5195
  }
5196 5197
  nr= (ulonglong) val_int();
  if ((length == 8) && !(field->flags & UNSIGNED_FLAG) && (nr > LONGLONG_MAX))
unknown's avatar
unknown committed
5198
  {
5199 5200
    nr= LONGLONG_MAX;
    goto warn;
unknown's avatar
unknown committed
5201
  }
unknown's avatar
unknown committed
5202
  return field->store((longlong) nr, TRUE);  // Assume hex numbers are unsigned
5203 5204

warn:
unknown's avatar
unknown committed
5205
  if (!field->store((longlong) nr, TRUE))
5206 5207 5208
    field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE,
                       1);
  return 1;
unknown's avatar
unknown committed
5209 5210 5211
}


5212
void Item_hex_string::print(String *str, enum_query_type query_type)
5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224
{
  char *end= (char*) str_value.ptr() + str_value.length(),
       *ptr= end - min(str_value.length(), sizeof(longlong));
  str->append("0x");
  for (; ptr != end ; ptr++)
  {
    str->append(_dig_vec_lower[((uchar) *ptr) >> 4]);
    str->append(_dig_vec_lower[((uchar) *ptr) & 0x0F]);
  }
}


5225
bool Item_hex_string::eq(const Item *arg, bool binary_cmp) const
5226 5227 5228 5229 5230 5231 5232 5233 5234 5235
{
  if (arg->basic_const_item() && arg->type() == type())
  {
    if (binary_cmp)
      return !stringcmp(&str_value, &arg->str_value);
    return !sortcmp(&str_value, &arg->str_value, collation.collation);
  }
  return FALSE;
}

unknown's avatar
unknown committed
5236

unknown's avatar
unknown committed
5237
Item *Item_hex_string::safe_charset_converter(CHARSET_INFO *tocs)
unknown's avatar
unknown committed
5238 5239 5240 5241 5242 5243 5244
{
  Item_string *conv;
  String tmp, *str= val_str(&tmp);

  if (!(conv= new Item_string(str->ptr(), str->length(), tocs)))
    return NULL;
  conv->str_value.copy();
5245
  conv->str_value.mark_as_const();
unknown's avatar
unknown committed
5246 5247 5248 5249
  return conv;
}


unknown's avatar
unknown committed
5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266
/*
  bin item.
  In string context this is a binary string.
  In number context this is a longlong value.
*/
  
Item_bin_string::Item_bin_string(const char *str, uint str_length)
{
  const char *end= str + str_length - 1;
  uchar bits= 0;
  uint power= 1;

  max_length= (str_length + 7) >> 3;
  char *ptr= (char*) sql_alloc(max_length + 1);
  if (!ptr)
    return;
  str_value.set(ptr, max_length, &my_charset_bin);
Gleb Shchepa's avatar
Gleb Shchepa committed
5267 5268

  if (max_length > 0)
unknown's avatar
unknown committed
5269
  {
Gleb Shchepa's avatar
Gleb Shchepa committed
5270 5271 5272
    ptr+= max_length - 1;
    ptr[1]= 0;                     // Set end null for string
    for (; end >= str; end--)
unknown's avatar
unknown committed
5273
    {
Gleb Shchepa's avatar
Gleb Shchepa committed
5274 5275 5276 5277 5278 5279 5280 5281 5282
      if (power == 256)
      {
        power= 1;
        *ptr--= bits;
        bits= 0;
      }
      if (*end == '1')
        bits|= power;
      power<<= 1;
unknown's avatar
unknown committed
5283
    }
Gleb Shchepa's avatar
Gleb Shchepa committed
5284
    *ptr= (char) bits;
unknown's avatar
unknown committed
5285
  }
Gleb Shchepa's avatar
Gleb Shchepa committed
5286 5287 5288
  else
    ptr[0]= 0;

unknown's avatar
unknown committed
5289 5290 5291 5292 5293
  collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
  fixed= 1;
}


unknown's avatar
unknown committed
5294 5295
/**
  Pack data in buffer for sending.
5296 5297 5298
*/

bool Item_null::send(Protocol *protocol, String *packet)
unknown's avatar
unknown committed
5299
{
5300
  return protocol->store_null();
unknown's avatar
unknown committed
5301 5302
}

unknown's avatar
unknown committed
5303 5304
/**
  This is only called from items that is not of type item_field.
unknown's avatar
unknown committed
5305 5306
*/

5307
bool Item::send(Protocol *protocol, String *buffer)
unknown's avatar
unknown committed
5308
{
5309
  bool result;
5310
  enum_field_types f_type;
5311
  LINT_INIT(result);                     // Will be set if null_value == 0
5312

5313
  switch ((f_type=field_type())) {
5314
  default:
5315 5316 5317 5318 5319 5320 5321 5322 5323
  case MYSQL_TYPE_NULL:
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_GEOMETRY:
5324 5325
  case MYSQL_TYPE_STRING:
  case MYSQL_TYPE_VAR_STRING:
5326
  case MYSQL_TYPE_VARCHAR:
unknown's avatar
unknown committed
5327
  case MYSQL_TYPE_BIT:
unknown's avatar
unknown committed
5328
  case MYSQL_TYPE_NEWDECIMAL:
5329 5330 5331
  {
    String *res;
    if ((res=val_str(buffer)))
5332
      result= protocol->store(res->ptr(),res->length(),res->charset());
5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343
    break;
  }
  case MYSQL_TYPE_TINY:
  {
    longlong nr;
    nr= val_int();
    if (!null_value)
      result= protocol->store_tiny(nr);
    break;
  }
  case MYSQL_TYPE_SHORT:
unknown's avatar
unknown committed
5344
  case MYSQL_TYPE_YEAR:
5345 5346 5347 5348 5349 5350 5351
  {
    longlong nr;
    nr= val_int();
    if (!null_value)
      result= protocol->store_short(nr);
    break;
  }
5352
  case MYSQL_TYPE_INT24:
5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368
  case MYSQL_TYPE_LONG:
  {
    longlong nr;
    nr= val_int();
    if (!null_value)
      result= protocol->store_long(nr);
    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
    longlong nr;
    nr= val_int();
    if (!null_value)
      result= protocol->store_longlong(nr, unsigned_flag);
    break;
  }
unknown's avatar
unknown committed
5369 5370 5371
  case MYSQL_TYPE_FLOAT:
  {
    float nr;
5372
    nr= (float) val_real();
unknown's avatar
unknown committed
5373 5374 5375 5376
    if (!null_value)
      result= protocol->store(nr, decimals, buffer);
    break;
  }
5377 5378
  case MYSQL_TYPE_DOUBLE:
  {
5379
    double nr= val_real();
5380 5381 5382 5383 5384 5385
    if (!null_value)
      result= protocol->store(nr, decimals, buffer);
    break;
  }
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_DATE:
5386
  case MYSQL_TYPE_TIMESTAMP:
5387
  {
5388
    MYSQL_TIME tm;
5389
    get_date(&tm, TIME_FUZZY_DATE);
5390 5391
    if (!null_value)
    {
5392
      if (f_type == MYSQL_TYPE_DATE)
5393 5394 5395 5396 5397 5398 5399 5400
	return protocol->store_date(&tm);
      else
	result= protocol->store(&tm);
    }
    break;
  }
  case MYSQL_TYPE_TIME:
  {
5401
    MYSQL_TIME tm;
5402 5403 5404 5405 5406 5407 5408 5409 5410
    get_time(&tm);
    if (!null_value)
      result= protocol->store_time(&tm);
    break;
  }
  }
  if (null_value)
    result= protocol->store_null();
  return result;
unknown's avatar
unknown committed
5411 5412
}

5413 5414

bool Item_field::send(Protocol *protocol, String *buffer)
unknown's avatar
unknown committed
5415
{
5416
  return protocol->store(result_field);
unknown's avatar
unknown committed
5417 5418
}

5419

5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435
void Item_field::update_null_value() 
{ 
  /* 
    need to set no_errors to prevent warnings about type conversion 
    popping up.
  */
  THD *thd= field->table->in_use;
  int no_errors;

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


5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457
/*
  Add the field to the select list and substitute it for the reference to
  the field.

  SYNOPSIS
    Item_field::update_value_transformer()
    select_arg      current select

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

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

5458
Item *Item_field::update_value_transformer(uchar *select_arg)
5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480
{
  SELECT_LEX *select= (SELECT_LEX*)select_arg;
  DBUG_ASSERT(fixed);

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

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


5481
void Item_field::print(String *str, enum_query_type query_type)
5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492
{
  if (field && field->table->const_table)
  {
    char buff[MAX_FIELD_WIDTH];
    String tmp(buff,sizeof(buff),str->charset());
    field->val_str(&tmp);
    str->append('\'');
    str->append(tmp);
    str->append('\'');
    return;
  }
5493
  Item_ident::print(str, query_type);
5494 5495 5496
}


5497 5498
Item_ref::Item_ref(Name_resolution_context *context_arg,
                   Item **item, const char *table_name_arg,
unknown's avatar
unknown committed
5499 5500
                   const char *field_name_arg,
                   bool alias_name_used_arg)
5501 5502
  :Item_ident(context_arg, NullS, table_name_arg, field_name_arg),
   result_field(0), ref(item)
unknown's avatar
unknown committed
5503
{
unknown's avatar
unknown committed
5504
  alias_name_used= alias_name_used_arg;
unknown's avatar
unknown committed
5505 5506 5507
  /*
    This constructor used to create some internals references over fixed items
  */
5508
  if (ref && *ref && (*ref)->fixed)
unknown's avatar
unknown committed
5509 5510 5511 5512
    set_properties();
}


unknown's avatar
unknown committed
5513
/**
5514
  Resolve the name of a reference to a column reference.
5515

unknown's avatar
unknown committed
5516 5517 5518 5519
  The method resolves the column reference represented by 'this' as a column
  present in one of: GROUP BY clause, SELECT clause, outer queries. It is
  used typically for columns in the HAVING clause which are not under
  aggregate functions.
5520

unknown's avatar
unknown committed
5521 5522
  POSTCONDITION @n
  Item_ref::ref is 0 or points to a valid item.
5523

unknown's avatar
unknown committed
5524
  @note
5525 5526
    The name resolution algorithm used is (where [T_j] is an optional table
    name that qualifies the column name):
5527

unknown's avatar
unknown committed
5528 5529
  @code
        resolve_extended([T_j].col_ref_i)
5530
        {
unknown's avatar
unknown committed
5531 5532
          Search for a column or derived column named col_ref_i [in table T_j]
          in the SELECT and GROUP clauses of Q.
5533

unknown's avatar
unknown committed
5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550
          if such a column is NOT found AND    // Lookup in outer queries.
             there are outer queries
          {
            for each outer query Q_k beginning from the inner-most one
           {
              Search for a column or derived column named col_ref_i
              [in table T_j] in the SELECT and GROUP clauses of Q_k.

              if such a column is not found AND
                 - Q_k is not a group query AND
                 - Q_k is not inside an aggregate function
                 OR
                 - Q_(k-1) is not in a HAVING or SELECT clause of Q_k
              {
                search for a column or derived column named col_ref_i
                [in table T_j] in the FROM clause of Q_k;
              }
5551 5552 5553
            }
          }
        }
unknown's avatar
unknown committed
5554 5555
  @endcode
  @n
5556
    This procedure treats GROUP BY and SELECT clauses as one namespace for
5557 5558 5559
    column references in HAVING. Notice that compared to
    Item_field::fix_fields, here we first search the SELECT and GROUP BY
    clauses, and then we search the FROM clause.
5560

unknown's avatar
unknown committed
5561 5562 5563
  @param[in]     thd        current thread
  @param[in,out] reference  view column if this item was resolved to a
    view column
5564

unknown's avatar
unknown committed
5565 5566 5567 5568 5569 5570 5571
  @todo
    Here we could first find the field anyway, and then test this
    condition, so that we can give a better error message -
    ER_WRONG_FIELD_WITH_GROUP, instead of the less informative
    ER_BAD_FIELD_ERROR which we produce now.

  @retval
5572
    TRUE  if error
unknown's avatar
unknown committed
5573
  @retval
5574 5575
    FALSE on success
*/
unknown's avatar
unknown committed
5576

5577
bool Item_ref::fix_fields(THD *thd, Item **reference)
unknown's avatar
unknown committed
5578
{
5579
  enum_parsing_place place= NO_MATTER;
5580
  DBUG_ASSERT(fixed == 0);
5581 5582
  SELECT_LEX *current_sel= thd->lex->current_select;

unknown's avatar
unknown committed
5583
  if (!ref || ref == not_found_item)
unknown's avatar
unknown committed
5584
  {
5585 5586 5587
    if (!(ref= resolve_ref_in_select_and_group(thd, this,
                                               context->select_lex)))
      goto error;             /* Some error occurred (e.g. ambiguous names). */
5588

5589
    if (ref == not_found_item) /* This reference was not resolved. */
unknown's avatar
unknown committed
5590
    {
5591 5592
      Name_resolution_context *last_checked_context= context;
      Name_resolution_context *outer_context= context->outer_context;
5593 5594 5595
      Field *from_field;
      ref= 0;

5596
      if (!outer_context)
5597 5598 5599 5600
      {
        /* The current reference cannot be resolved in this query. */
        my_error(ER_BAD_FIELD_ERROR,MYF(0),
                 this->full_name(), current_thd->where);
5601
        goto error;
5602
      }
5603

unknown's avatar
unknown committed
5604
      /*
5605 5606 5607
        If there is an outer context (select), and it is not a derived table
        (which do not support the use of outer fields for now), try to
        resolve this reference in the outer select(s).
5608

5609 5610 5611
        We treat each subselect as a separate namespace, so that different
        subselects may contain columns with the same names. The subselects are
        searched starting from the innermost.
unknown's avatar
unknown committed
5612
      */
5613 5614
      from_field= (Field*) not_found_field;

5615
      do
5616
      {
5617 5618 5619 5620
        SELECT_LEX *select= outer_context->select_lex;
        Item_subselect *prev_subselect_item=
          last_checked_context->select_lex->master_unit()->item;
        last_checked_context= outer_context;
5621

5622
        /* Search in the SELECT and GROUP lists of the outer select. */
5623
        if (outer_context->resolve_in_select_list)
5624
        {
5625 5626
          if (!(ref= resolve_ref_in_select_and_group(thd, this, select)))
            goto error; /* Some error occurred (e.g. ambiguous names). */
5627
          if (ref != not_found_item)
5628
          {
5629 5630 5631 5632
            DBUG_ASSERT(*ref && (*ref)->fixed);
            prev_subselect_item->used_tables_cache|= (*ref)->used_tables();
            prev_subselect_item->const_item_cache&= (*ref)->const_item();
            break;
5633 5634
          }
          /*
5635 5636 5637
            Set ref to 0 to ensure that we get an error in case we replaced
            this item with another item and still use this item in some
            other place of the parse tree.
5638
          */
5639
          ref= 0;
5640
        }
5641

5642 5643 5644 5645 5646
        place= prev_subselect_item->parsing_place;
        /*
          Check table fields only if the subquery is used somewhere out of
          HAVING or the outer SELECT does not use grouping (i.e. tables are
          accessible).
5647
          TODO:
5648 5649 5650 5651 5652 5653
          Here we could first find the field anyway, and then test this
          condition, so that we can give a better error message -
          ER_WRONG_FIELD_WITH_GROUP, instead of the less informative
          ER_BAD_FIELD_ERROR which we produce now.
        */
        if ((place != IN_HAVING ||
5654 5655
             (!select->with_sum_func &&
              select->group_list.elements == 0)))
5656
        {
5657
          /*
5658 5659 5660
            In case of view, find_field_in_tables() write pointer to view
            field expression to 'reference', i.e. it substitute that
            expression instead of this Item_ref
5661
          */
5662
          from_field= find_field_in_tables(thd, this,
unknown's avatar
unknown committed
5663 5664 5665 5666
                                           outer_context->
                                             first_name_resolution_table,
                                           outer_context->
                                             last_name_resolution_table,
5667 5668
                                           reference,
                                           IGNORE_EXCEPT_NON_UNIQUE,
5669
                                           TRUE, TRUE);
5670
          if (! from_field)
5671
            goto error;
5672
          if (from_field == view_ref_found)
5673
          {
5674
            Item::Type refer_type= (*reference)->type();
5675 5676 5677 5678 5679
            prev_subselect_item->used_tables_cache|=
              (*reference)->used_tables();
            prev_subselect_item->const_item_cache&=
              (*reference)->const_item();
            DBUG_ASSERT((*reference)->type() == REF_ITEM);
5680 5681
            mark_as_dependent(thd, last_checked_context->select_lex,
                              context->select_lex, this,
5682 5683
                              ((refer_type == REF_ITEM ||
                                refer_type == FIELD_ITEM) ?
5684 5685 5686 5687 5688 5689
                               (Item_ident*) (*reference) :
                               0));
            /*
              view reference found, we substituted it instead of this
              Item, so can quit
            */
5690 5691
            return FALSE;
          }
5692 5693
          if (from_field != not_found_field)
          {
5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712
            if (cached_table && cached_table->select_lex &&
                outer_context->select_lex &&
                cached_table->select_lex != outer_context->select_lex)
            {
              /*
                Due to cache, find_field_in_tables() can return field which
                doesn't belong to provided outer_context. In this case we have
                to find proper field context in order to fix field correcly.
              */
              do
              {
                outer_context= outer_context->outer_context;
                select= outer_context->select_lex;
                prev_subselect_item=
                  last_checked_context->select_lex->master_unit()->item;
                last_checked_context= outer_context;
              } while (outer_context && outer_context->select_lex &&
                       cached_table->select_lex != outer_context->select_lex);
            }
5713 5714 5715 5716
            prev_subselect_item->used_tables_cache|= from_field->table->map;
            prev_subselect_item->const_item_cache= 0;
            break;
          }
5717
        }
5718 5719 5720 5721 5722 5723
        DBUG_ASSERT(from_field == not_found_field);

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

5724 5725
        outer_context= outer_context->outer_context;
      } while (outer_context);
5726 5727 5728

      DBUG_ASSERT(from_field != 0 && from_field != view_ref_found);
      if (from_field != not_found_field)
5729
      {
5730 5731
        Item_field* fld;
        if (!(fld= new Item_field(from_field)))
5732
          goto error;
5733
        thd->change_item_tree(reference, fld);
5734 5735
        mark_as_dependent(thd, last_checked_context->select_lex,
                          thd->lex->current_select, this, fld);
unknown's avatar
unknown committed
5736 5737 5738 5739 5740 5741 5742 5743 5744 5745
        /*
          A reference is resolved to a nest level that's outer or the same as
          the nest level of the enclosing set function : adjust the value of
          max_arg_level for the function if it's needed.
        */
        if (thd->lex->in_sum_func &&
            thd->lex->in_sum_func->nest_level >= 
            last_checked_context->select_lex->nest_level)
          set_if_bigger(thd->lex->in_sum_func->max_arg_level,
                        last_checked_context->select_lex->nest_level);
5746 5747 5748 5749 5750 5751
        return FALSE;
      }
      if (ref == 0)
      {
        /* The item was not a table field and not a reference */
        my_error(ER_BAD_FIELD_ERROR, MYF(0),
5752
                 this->full_name(), current_thd->where);
5753
        goto error;
5754
      }
5755 5756
      /* Should be checked in resolve_ref_in_select_and_group(). */
      DBUG_ASSERT(*ref && (*ref)->fixed);
5757 5758
      mark_as_dependent(thd, last_checked_context->select_lex,
                        context->select_lex, this, this);
unknown's avatar
unknown committed
5759 5760 5761 5762 5763 5764 5765 5766 5767 5768
      /*
        A reference is resolved to a nest level that's outer or the same as
        the nest level of the enclosing set function : adjust the value of
        max_arg_level for the function if it's needed.
      */
      if (thd->lex->in_sum_func &&
          thd->lex->in_sum_func->nest_level >= 
          last_checked_context->select_lex->nest_level)
        set_if_bigger(thd->lex->in_sum_func->max_arg_level,
                      last_checked_context->select_lex->nest_level);
5769
    }
unknown's avatar
unknown committed
5770
  }
5771

5772
  DBUG_ASSERT(*ref);
5773
  /*
5774
    Check if this is an incorrect reference in a group function or forward
unknown's avatar
unknown committed
5775 5776 5777
    reference. Do not issue an error if this is:
      1. outer reference (will be fixed later by the fix_inner_refs function);
      2. an unnamed reference inside an aggregate function.
5778
  */
unknown's avatar
unknown committed
5779 5780 5781 5782 5783 5784
  if (!((*ref)->type() == REF_ITEM &&
       ((Item_ref *)(*ref))->ref_type() == OUTER_REF) &&
      (((*ref)->with_sum_func && name &&
        !(current_sel->linkage != GLOBAL_OPTIONS_TYPE &&
          current_sel->having_fix_field)) ||
       !(*ref)->fixed))
5785
  {
5786 5787 5788 5789
    my_error(ER_ILLEGAL_REFERENCE, MYF(0),
             name, ((*ref)->with_sum_func?
                    "reference to group function":
                    "forward reference in item list"));
5790
    goto error;
5791
  }
5792 5793 5794

  set_properties();

5795
  if ((*ref)->check_cols(1))
5796
    goto error;
5797
  return FALSE;
5798 5799 5800 5801

error:
  context->process_error(thd);
  return TRUE;
5802 5803
}

5804

5805 5806
void Item_ref::set_properties()
{
5807 5808 5809
  max_length= (*ref)->max_length;
  maybe_null= (*ref)->maybe_null;
  decimals=   (*ref)->decimals;
5810
  collation.set((*ref)->collation);
unknown's avatar
unknown committed
5811 5812 5813 5814
  /*
    We have to remember if we refer to a sum function, to ensure that
    split_sum_func() doesn't try to change the reference.
  */
unknown's avatar
unknown committed
5815
  with_sum_func= (*ref)->with_sum_func;
unknown's avatar
Merge  
unknown committed
5816
  unsigned_flag= (*ref)->unsigned_flag;
unknown's avatar
unknown committed
5817 5818 5819
  fixed= 1;
  if (alias_name_used)
    return;
unknown's avatar
unknown committed
5820 5821 5822 5823
  if ((*ref)->type() == FIELD_ITEM)
    alias_name_used= ((Item_ident *) (*ref))->alias_name_used;
  else
    alias_name_used= TRUE; // it is not field, so it is was resolved by alias
unknown's avatar
unknown committed
5824 5825
}

5826

unknown's avatar
unknown committed
5827 5828
void Item_ref::cleanup()
{
unknown's avatar
unknown committed
5829
  DBUG_ENTER("Item_ref::cleanup");
unknown's avatar
unknown committed
5830
  Item_ident::cleanup();
5831
  result_field= 0;
unknown's avatar
unknown committed
5832
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
5833 5834 5835
}


5836
void Item_ref::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
5837
{
5838
  if (ref)
unknown's avatar
unknown committed
5839 5840
  {
    if ((*ref)->type() != Item::CACHE_ITEM && ref_type() != VIEW_REF &&
unknown's avatar
unknown committed
5841
        !table_name && name && alias_name_used)
unknown's avatar
unknown committed
5842 5843 5844 5845 5846
    {
      THD *thd= current_thd;
      append_identifier(thd, str, name, (uint) strlen(name));
    }
    else
5847
      (*ref)->print(str, query_type);
unknown's avatar
unknown committed
5848
  }
unknown's avatar
unknown committed
5849
  else
5850
    Item_ident::print(str, query_type);
unknown's avatar
unknown committed
5851 5852 5853
}


5854 5855 5856 5857 5858 5859 5860 5861
bool Item_ref::send(Protocol *prot, String *tmp)
{
  if (result_field)
    return prot->store(result_field);
  return (*ref)->send(prot, tmp);
}


5862 5863 5864 5865 5866 5867 5868 5869
double Item_ref::val_result()
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
      return 0.0;
    return result_field->val_real();
  }
5870
  return val_real();
5871 5872 5873
}


5874 5875 5876 5877 5878 5879 5880 5881 5882
bool Item_ref::is_null_result()
{
  if (result_field)
    return (null_value=result_field->is_null());

  return is_null();
}


5883 5884 5885 5886 5887
longlong Item_ref::val_int_result()
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
5888
      return 0;
5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907
    return result_field->val_int();
  }
  return val_int();
}


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


unknown's avatar
unknown committed
5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925
my_decimal *Item_ref::val_decimal_result(my_decimal *decimal_value)
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
      return 0;
    return result_field->val_decimal(decimal_value);
  }
  return val_decimal(decimal_value);
}


bool Item_ref::val_bool_result()
{
  if (result_field)
  {
    if ((null_value= result_field->is_null()))
      return 0;
5926
    switch (result_field->result_type()) {
unknown's avatar
unknown committed
5927
    case INT_RESULT:
5928
      return result_field->val_int() != 0;
unknown's avatar
unknown committed
5929
    case DECIMAL_RESULT:
5930 5931 5932 5933 5934 5935 5936
    {
      my_decimal decimal_value;
      my_decimal *val= result_field->val_decimal(&decimal_value);
      if (val)
        return !my_decimal_is_zero(val);
      return 0;
    }
unknown's avatar
unknown committed
5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987
    case REAL_RESULT:
    case STRING_RESULT:
      return result_field->val_real() != 0.0;
    case ROW_RESULT:
    default:
      DBUG_ASSERT(0);
    }
  }
  return val_bool();
}


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


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


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


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


bool Item_ref::is_null()
{
  DBUG_ASSERT(fixed);
5988 5989 5990
  bool tmp=(*ref)->is_null_result();
  null_value=(*ref)->null_value;
  return tmp;
unknown's avatar
unknown committed
5991 5992 5993
}


5994
bool Item_ref::get_date(MYSQL_TIME *ltime,uint fuzzydate)
unknown's avatar
unknown committed
5995 5996 5997 5998 5999 6000 6001
{
  return (null_value=(*ref)->get_date_result(ltime,fuzzydate));
}


my_decimal *Item_ref::val_decimal(my_decimal *decimal_value)
{
unknown's avatar
unknown committed
6002
  my_decimal *val= (*ref)->val_decimal_result(decimal_value);
unknown's avatar
unknown committed
6003 6004 6005 6006
  null_value= (*ref)->null_value;
  return val;
}

6007 6008 6009
int Item_ref::save_in_field(Field *to, bool no_conversions)
{
  int res;
6010
  DBUG_ASSERT(!result_field);
6011 6012 6013 6014 6015
  res= (*ref)->save_in_field(to, no_conversions);
  null_value= (*ref)->null_value;
  return res;
}

unknown's avatar
unknown committed
6016

unknown's avatar
unknown committed
6017 6018 6019 6020 6021 6022
void Item_ref::save_org_in_field(Field *field)
{
  (*ref)->save_org_in_field(field);
}


6023 6024 6025 6026 6027 6028 6029 6030 6031 6032
void Item_ref::make_field(Send_field *field)
{
  (*ref)->make_field(field);
  /* Non-zero in case of a view */
  if (name)
    field->col_name= name;
  if (table_name)
    field->table_name= table_name;
  if (db_name)
    field->db_name= db_name;
6033 6034 6035 6036
  if (orig_field_name)
    field->org_col_name= orig_field_name;
  if (orig_table_name)
    field->org_table_name= orig_table_name;
unknown's avatar
unknown committed
6037
}
6038 6039


unknown's avatar
unknown committed
6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054
Item *Item_ref::get_tmp_table_item(THD *thd)
{
  if (!result_field)
    return (*ref)->get_tmp_table_item(thd);

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


6055
void Item_ref_null_helper::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
6056
{
6057
  str->append(STRING_WITH_LEN("<ref_null_helper>("));
6058
  if (ref)
6059
    (*ref)->print(str, query_type);
unknown's avatar
unknown committed
6060 6061 6062 6063 6064 6065
  else
    str->append('?');
  str->append(')');
}


unknown's avatar
unknown committed
6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107
double Item_direct_ref::val_real()
{
  double tmp=(*ref)->val_real();
  null_value=(*ref)->null_value;
  return tmp;
}


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


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


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


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


bool Item_direct_ref::is_null()
{
unknown's avatar
unknown committed
6108
  return (*ref)->is_null();
unknown's avatar
unknown committed
6109 6110 6111
}


6112
bool Item_direct_ref::get_date(MYSQL_TIME *ltime,uint fuzzydate)
unknown's avatar
unknown committed
6113 6114 6115 6116 6117
{
  return (null_value=(*ref)->get_date(ltime,fuzzydate));
}


unknown's avatar
unknown committed
6118 6119
/**
  Prepare referenced field then call usual Item_direct_ref::fix_fields .
6120

unknown's avatar
unknown committed
6121 6122
  @param thd         thread handler
  @param reference   reference on reference where this item stored
6123

unknown's avatar
unknown committed
6124
  @retval
6125
    FALSE   OK
unknown's avatar
unknown committed
6126
  @retval
6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140
    TRUE    Error
*/

bool Item_direct_view_ref::fix_fields(THD *thd, Item **reference)
{
  /* view fild reference must be defined */
  DBUG_ASSERT(*ref);
  /* (*ref)->check_cols() will be made in Item_direct_ref::fix_fields */
  if (!(*ref)->fixed &&
      ((*ref)->fix_fields(thd, ref)))
    return TRUE;
  return Item_direct_ref::fix_fields(thd, reference);
}

6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155
/*
  Prepare referenced outer field then call usual Item_direct_ref::fix_fields

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

  RETURN
    FALSE   OK
    TRUE    Error
*/

bool Item_outer_ref::fix_fields(THD *thd, Item **reference)
{
6156 6157 6158
  bool err;
  /* outer_ref->check_cols() will be made in Item_direct_ref::fix_fields */
  if ((*ref) && !(*ref)->fixed && ((*ref)->fix_fields(thd, reference)))
6159
    return TRUE;
6160 6161 6162 6163 6164 6165
  err= Item_direct_ref::fix_fields(thd, reference);
  if (!outer_ref)
    outer_ref= *ref;
  if ((*ref)->type() == Item::FIELD_ITEM)
    table_name= ((Item_field*)outer_ref)->table_name;
  return err;
6166 6167
}

6168

unknown's avatar
unknown committed
6169
/**
6170
  Compare two view column references for equality.
6171

unknown's avatar
unknown committed
6172 6173 6174 6175
  A view column reference is considered equal to another column
  reference if the second one is a view column and if both column
  references resolve to the same item. It is assumed that both
  items are of the same type.
6176

unknown's avatar
unknown committed
6177 6178
  @param item        item to compare with
  @param binary_cmp  make binary comparison
6179

unknown's avatar
unknown committed
6180
  @retval
6181
    TRUE    Referenced item is equal to given item
unknown's avatar
unknown committed
6182
  @retval
6183 6184 6185 6186 6187
    FALSE   otherwise
*/

bool Item_direct_view_ref::eq(const Item *item, bool binary_cmp) const
{
6188 6189 6190 6191 6192 6193
  if (item->type() == REF_ITEM)
  {
    Item_ref *item_ref= (Item_ref*) item;
    if (item_ref->ref_type() == VIEW_REF)
    {
      Item *item_ref_ref= *(item_ref->ref);
6194
      return ((*ref)->real_item() == item_ref_ref->real_item());
6195 6196 6197
    }
  }
  return FALSE;
6198
}
6199

unknown's avatar
SCRUM  
unknown committed
6200 6201
bool Item_default_value::eq(const Item *item, bool binary_cmp) const
{
unknown's avatar
SCRUM  
unknown committed
6202
  return item->type() == DEFAULT_VALUE_ITEM && 
unknown's avatar
SCRUM  
unknown committed
6203 6204 6205
    ((Item_default_value *)item)->arg->eq(arg, binary_cmp);
}

6206

6207
bool Item_default_value::fix_fields(THD *thd, Item **items)
unknown's avatar
SCRUM  
unknown committed
6208
{
6209
  Item *real_arg;
unknown's avatar
unknown committed
6210 6211
  Item_field *field_arg;
  Field *def_field;
6212
  DBUG_ASSERT(fixed == 0);
unknown's avatar
unknown committed
6213

unknown's avatar
SCRUM  
unknown committed
6214
  if (!arg)
6215 6216
  {
    fixed= 1;
unknown's avatar
unknown committed
6217
    return FALSE;
6218
  }
6219 6220 6221
  if (!arg->fixed && arg->fix_fields(thd, &arg))
    goto error;

6222

6223 6224
  real_arg= arg->real_item();
  if (real_arg->type() != FIELD_ITEM)
unknown's avatar
SCRUM  
unknown committed
6225
  {
6226
    my_error(ER_NO_DEFAULT_FOR_FIELD, MYF(0), arg->name);
6227
    goto error;
unknown's avatar
SCRUM  
unknown committed
6228
  }
6229

6230
  field_arg= (Item_field *)real_arg;
unknown's avatar
unknown committed
6231 6232
  if (field_arg->field->flags & NO_DEFAULT_VALUE_FLAG)
  {
6233
    my_error(ER_NO_DEFAULT_FOR_FIELD, MYF(0), field_arg->field->field_name);
6234
    goto error;
unknown's avatar
unknown committed
6235 6236
  }
  if (!(def_field= (Field*) sql_alloc(field_arg->field->size_of())))
6237
    goto error;
unknown's avatar
SCRUM  
unknown committed
6238
  memcpy(def_field, field_arg->field, field_arg->field->size_of());
unknown's avatar
unknown committed
6239 6240 6241
  def_field->move_field_offset((my_ptrdiff_t)
                               (def_field->table->s->default_values -
                                def_field->table->record[0]));
unknown's avatar
SCRUM  
unknown committed
6242
  set_field(def_field);
unknown's avatar
unknown committed
6243
  return FALSE;
6244 6245 6246 6247

error:
  context->process_error(thd);
  return TRUE;
unknown's avatar
SCRUM  
unknown committed
6248 6249
}

6250

6251
void Item_default_value::print(String *str, enum_query_type query_type)
unknown's avatar
SCRUM  
unknown committed
6252
{
unknown's avatar
SCRUM  
unknown committed
6253 6254
  if (!arg)
  {
6255
    str->append(STRING_WITH_LEN("default"));
unknown's avatar
SCRUM  
unknown committed
6256
    return;
unknown's avatar
SCRUM  
unknown committed
6257
  }
6258
  str->append(STRING_WITH_LEN("default("));
6259
  arg->print(str, query_type);
unknown's avatar
SCRUM  
unknown committed
6260 6261
  str->append(')');
}
6262

6263 6264 6265 6266 6267 6268 6269

int Item_default_value::save_in_field(Field *field_arg, bool no_conversions)
{
  if (!arg)
  {
    if (field_arg->flags & NO_DEFAULT_VALUE_FLAG)
    {
6270 6271 6272 6273 6274 6275 6276
      if (field_arg->reset())
      {
        my_message(ER_CANT_CREATE_GEOMETRY_OBJECT,
                   ER(ER_CANT_CREATE_GEOMETRY_OBJECT), MYF(0));
        return -1;
      }

6277 6278
      if (context->error_processor == &view_error_processor)
      {
unknown's avatar
unknown committed
6279
        TABLE_LIST *view= cached_table->top_table();
6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294
        push_warning_printf(field_arg->table->in_use,
                            MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_NO_DEFAULT_FOR_VIEW_FIELD,
                            ER(ER_NO_DEFAULT_FOR_VIEW_FIELD),
                            view->view_db.str,
                            view->view_name.str);
      }
      else
      {
        push_warning_printf(field_arg->table->in_use,
                            MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_NO_DEFAULT_FOR_FIELD,
                            ER(ER_NO_DEFAULT_FOR_FIELD),
                            field_arg->field_name);
      }
6295 6296 6297 6298 6299 6300 6301 6302 6303
      return 1;
    }
    field_arg->set_default();
    return 0;
  }
  return Item_field::save_in_field(field_arg, no_conversions);
}


unknown's avatar
unknown committed
6304
/**
6305
  This method like the walk method traverses the item tree, but at the
unknown's avatar
unknown committed
6306
  same time it can replace some nodes in the tree.
6307
*/ 
6308

6309
Item *Item_default_value::transform(Item_transformer transformer, uchar *args)
6310 6311 6312
{
  DBUG_ASSERT(!current_thd->is_stmt_prepare());

6313 6314 6315 6316 6317 6318 6319
  /*
    If the value of arg is NULL, then this object represents a constant,
    so further transformation is unnecessary (and impossible).
  */
  if (!arg)
    return 0;

6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335
  Item *new_item= arg->transform(transformer, args);
  if (!new_item)
    return 0;

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


unknown's avatar
unknown committed
6336 6337 6338 6339 6340 6341 6342
bool Item_insert_value::eq(const Item *item, bool binary_cmp) const
{
  return item->type() == INSERT_VALUE_ITEM &&
    ((Item_default_value *)item)->arg->eq(arg, binary_cmp);
}


6343
bool Item_insert_value::fix_fields(THD *thd, Item **items)
unknown's avatar
unknown committed
6344
{
6345
  DBUG_ASSERT(fixed == 0);
6346
  /* We should only check that arg is in first table */
6347
  if (!arg->fixed)
6348
  {
6349
    bool res;
6350
    TABLE_LIST *orig_next_table= context->last_name_resolution_table;
6351 6352
    context->last_name_resolution_table= context->first_name_resolution_table;
    res= arg->fix_fields(thd, &arg);
6353
    context->last_name_resolution_table= orig_next_table;
6354 6355
    if (res)
      return TRUE;
6356
  }
6357

unknown's avatar
unknown committed
6358 6359 6360 6361 6362
  if (arg->type() == REF_ITEM)
  {
    Item_ref *ref= (Item_ref *)arg;
    if (ref->ref[0]->type() != FIELD_ITEM)
    {
6363
      my_error(ER_BAD_FIELD_ERROR, MYF(0), "", "VALUES() function");
unknown's avatar
unknown committed
6364
      return TRUE;
unknown's avatar
unknown committed
6365 6366 6367
    }
    arg= ref->ref[0];
  }
6368 6369 6370 6371 6372 6373
  /*
    According to our SQL grammar, VALUES() function can reference
    only to a column.
  */
  DBUG_ASSERT(arg->type() == FIELD_ITEM);

unknown's avatar
unknown committed
6374
  Item_field *field_arg= (Item_field *)arg;
6375

unknown's avatar
unknown committed
6376 6377 6378 6379
  if (field_arg->field->table->insert_values)
  {
    Field *def_field= (Field*) sql_alloc(field_arg->field->size_of());
    if (!def_field)
unknown's avatar
unknown committed
6380
      return TRUE;
unknown's avatar
unknown committed
6381
    memcpy(def_field, field_arg->field, field_arg->field->size_of());
unknown's avatar
unknown committed
6382 6383 6384
    def_field->move_field_offset((my_ptrdiff_t)
                                 (def_field->table->insert_values -
                                  def_field->table->record[0]));
unknown's avatar
unknown committed
6385 6386 6387 6388
    set_field(def_field);
  }
  else
  {
6389
    Field *tmp_field= field_arg->field;
unknown's avatar
unknown committed
6390
    /* charset doesn't matter here, it's to avoid sigsegv only */
unknown's avatar
unknown committed
6391 6392 6393 6394 6395 6396 6397
    tmp_field= new Field_null(0, 0, Field::NONE, field_arg->field->field_name,
                          &my_charset_bin);
    if (tmp_field)
    {
      tmp_field->init(field_arg->field->table);
      set_field(tmp_field);
    }
unknown's avatar
unknown committed
6398
  }
unknown's avatar
unknown committed
6399
  return FALSE;
unknown's avatar
unknown committed
6400 6401
}

6402
void Item_insert_value::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
6403
{
6404
  str->append(STRING_WITH_LEN("values("));
6405
  arg->print(str, query_type);
unknown's avatar
unknown committed
6406 6407 6408
  str->append(')');
}

6409

unknown's avatar
unknown committed
6410
/**
unknown's avatar
unknown committed
6411 6412
  Find index of Field object which will be appropriate for item
  representing field of row being changed in trigger.
6413

unknown's avatar
unknown committed
6414 6415 6416
  @param thd     current thread context
  @param table   table of trigger (and where we looking for fields)
  @param table_grant_info   GRANT_INFO of the subject table
6417

unknown's avatar
unknown committed
6418
  @note
6419
    This function does almost the same as fix_fields() for Item_field
unknown's avatar
unknown committed
6420 6421 6422 6423 6424 6425 6426 6427
    but is invoked right after trigger definition parsing. Since at
    this stage we can't say exactly what Field object (corresponding
    to TABLE::record[0] or TABLE::record[1]) should be bound to this
    Item, we only find out index of the Field and then select concrete
    Field object in fix_fields() (by that time Table_trigger_list::old_field/
    new_field should point to proper array of Fields).
    It also binds Item_trigger_field to Table_triggers_list object for
    table of trigger which uses this item.
6428
*/
unknown's avatar
unknown committed
6429

unknown's avatar
unknown committed
6430 6431
void Item_trigger_field::setup_field(THD *thd, TABLE *table,
                                     GRANT_INFO *table_grant_info)
6432
{
6433
  /*
6434 6435 6436 6437 6438
    It is too early to mark fields used here, because before execution
    of statement that will invoke trigger other statements may use same
    TABLE object, so all such mark-up will be wiped out.
    So instead we do it in Table_triggers_list::mark_fields_used()
    method which is called during execution of these statements.
6439
  */
6440 6441
  enum_mark_columns save_mark_used_columns= thd->mark_used_columns;
  thd->mark_used_columns= MARK_COLUMNS_NONE;
unknown's avatar
unknown committed
6442 6443 6444 6445
  /*
    Try to find field by its name and if it will be found
    set field_idx properly.
  */
unknown's avatar
unknown committed
6446
  (void)find_field_in_table(thd, table, field_name, (uint) strlen(field_name),
6447
                            0, &field_idx);
6448
  thd->mark_used_columns= save_mark_used_columns;
unknown's avatar
unknown committed
6449
  triggers= table->triggers;
unknown's avatar
unknown committed
6450
  table_grants= table_grant_info;
6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462
}


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


6463
void Item_trigger_field::set_required_privilege(bool rw)
6464 6465 6466 6467 6468 6469 6470 6471 6472
{
  /*
    Require SELECT and UPDATE privilege if this field will be read and
    set, and only UPDATE privilege for setting the field.
  */
  want_privilege= (rw ? SELECT_ACL | UPDATE_ACL : UPDATE_ACL);
}


6473
bool Item_trigger_field::set_value(THD *thd, sp_rcontext * /*ctx*/, Item **it)
6474
{
6475
  Item *item= sp_prepare_func_item(thd, it);
6476 6477 6478 6479 6480 6481

  return (!item || (!fixed && fix_fields(thd, 0)) ||
          (item->save_in_field(field, 0) < 0));
}


6482
bool Item_trigger_field::fix_fields(THD *thd, Item **items)
6483 6484 6485 6486 6487 6488
{
  /*
    Since trigger is object tightly associated with TABLE object most
    of its set up can be performed during trigger loading i.e. trigger
    parsing! So we have little to do in fix_fields. :)
  */
unknown's avatar
unknown committed
6489

6490
  DBUG_ASSERT(fixed == 0);
6491

unknown's avatar
unknown committed
6492 6493
  /* Set field. */

unknown's avatar
unknown committed
6494
  if (field_idx != (uint)-1)
6495
  {
unknown's avatar
unknown committed
6496 6497 6498 6499 6500 6501 6502 6503
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    /*
      Check access privileges for the subject table. We check privileges only
      in runtime.
    */

    if (table_grants)
    {
6504
      table_grants->want_privilege= want_privilege;
unknown's avatar
unknown committed
6505

unknown's avatar
unknown committed
6506 6507
      if (check_grant_column(thd, table_grants, triggers->trigger_table->s->db.str,
                             triggers->trigger_table->s->table_name.str, field_name,
unknown's avatar
unknown committed
6508 6509 6510 6511 6512
                             strlen(field_name), thd->security_ctx))
        return TRUE;
    }
#endif // NO_EMBEDDED_ACCESS_CHECKS

unknown's avatar
unknown committed
6513 6514
    field= (row_version == OLD_ROW) ? triggers->old_field[field_idx] :
                                      triggers->new_field[field_idx];
6515 6516
    set_field(field);
    fixed= 1;
unknown's avatar
unknown committed
6517
    return FALSE;
6518 6519 6520 6521
  }

  my_error(ER_BAD_FIELD_ERROR, MYF(0), field_name,
           (row_version == NEW_ROW) ? "NEW" : "OLD");
unknown's avatar
unknown committed
6522
  return TRUE;
6523 6524 6525
}


6526
void Item_trigger_field::print(String *str, enum_query_type query_type)
6527 6528 6529 6530 6531 6532 6533 6534 6535
{
  str->append((row_version == NEW_ROW) ? "NEW" : "OLD", 3);
  str->append('.');
  str->append(field_name);
}


void Item_trigger_field::cleanup()
{
6536
  want_privilege= original_privilege;
6537 6538 6539 6540 6541 6542 6543 6544
  /*
    Since special nature of Item_trigger_field we should not do most of
    things from Item_field::cleanup() or Item_ident::cleanup() here.
  */
  Item::cleanup();
}


unknown's avatar
unknown committed
6545 6546 6547 6548
Item_result item_cmp_type(Item_result a,Item_result b)
{
  if (a == STRING_RESULT && b == STRING_RESULT)
    return STRING_RESULT;
6549
  if (a == INT_RESULT && b == INT_RESULT)
unknown's avatar
unknown committed
6550
    return INT_RESULT;
unknown's avatar
unknown committed
6551 6552
  else if (a == ROW_RESULT || b == ROW_RESULT)
    return ROW_RESULT;
unknown's avatar
unknown committed
6553 6554 6555
  if ((a == INT_RESULT || a == DECIMAL_RESULT) &&
      (b == INT_RESULT || b == DECIMAL_RESULT))
    return DECIMAL_RESULT;
6556
  return REAL_RESULT;
unknown's avatar
unknown committed
6557 6558 6559
}


6560
void resolve_const_item(THD *thd, Item **ref, Item *comp_item)
unknown's avatar
unknown committed
6561
{
6562
  Item *item= *ref;
6563
  Item *new_item= NULL;
unknown's avatar
unknown committed
6564
  if (item->basic_const_item())
6565
    return;                                     // Can't be better
unknown's avatar
unknown committed
6566 6567 6568 6569
  Item_result res_type=item_cmp_type(comp_item->result_type(),
				     item->result_type());
  char *name=item->name;			// Alloced by sql_alloc

6570
  switch (res_type) {
unknown's avatar
unknown committed
6571
  case STRING_RESULT:
unknown's avatar
unknown committed
6572 6573
  {
    char buff[MAX_FIELD_WIDTH];
unknown's avatar
unknown committed
6574
    String tmp(buff,sizeof(buff),&my_charset_bin),*result;
unknown's avatar
unknown committed
6575 6576
    result=item->val_str(&tmp);
    if (item->null_value)
6577 6578 6579 6580 6581 6582 6583
      new_item= new Item_null(name);
    else
    {
      uint length= result->length();
      char *tmp_str= sql_strmake(result->ptr(), length);
      new_item= new Item_string(name, tmp_str, length, result->charset());
    }
unknown's avatar
unknown committed
6584
    break;
unknown's avatar
unknown committed
6585
  }
unknown's avatar
unknown committed
6586
  case INT_RESULT:
unknown's avatar
unknown committed
6587 6588 6589 6590
  {
    longlong result=item->val_int();
    uint length=item->max_length;
    bool null_value=item->null_value;
6591 6592
    new_item= (null_value ? (Item*) new Item_null(name) :
               (Item*) new Item_int(name, result, length));
unknown's avatar
unknown committed
6593
    break;
unknown's avatar
unknown committed
6594
  }
6595
  case ROW_RESULT:
6596
  if (item->type() == Item::ROW_ITEM && comp_item->type() == Item::ROW_ITEM)
6597
  {
6598 6599 6600 6601 6602 6603 6604 6605
    /*
      Substitute constants only in Item_rows. Don't affect other Items
      with ROW_RESULT (eg Item_singlerow_subselect).

      For such Items more optimal is to detect if it is constant and replace
      it with Item_row. This would optimize queries like this:
      SELECT * FROM t1 WHERE (a,b) = (SELECT a,b FROM t2 LIMIT 1);
    */
unknown's avatar
unknown committed
6606 6607 6608
    Item_row *item_row= (Item_row*) item;
    Item_row *comp_item_row= (Item_row*) comp_item;
    uint col;
6609 6610 6611
    new_item= 0;
    /*
      If item and comp_item are both Item_rows and have same number of cols
unknown's avatar
unknown committed
6612 6613 6614
      then process items in Item_row one by one.
      We can't ignore NULL values here as this item may be used with <=>, in
      which case NULL's are significant.
6615
    */
unknown's avatar
unknown committed
6616 6617 6618 6619
    DBUG_ASSERT(item->result_type() == comp_item->result_type());
    DBUG_ASSERT(item_row->cols() == comp_item_row->cols());
    col= item_row->cols();
    while (col-- > 0)
6620 6621
      resolve_const_item(thd, item_row->addr(col),
                         comp_item_row->element_index(col));
unknown's avatar
unknown committed
6622
    break;
6623
  }
6624
  /* Fallthrough */
unknown's avatar
unknown committed
6625
  case REAL_RESULT:
unknown's avatar
unknown committed
6626
  {						// It must REAL_RESULT
6627
    double result= item->val_real();
unknown's avatar
unknown committed
6628 6629
    uint length=item->max_length,decimals=item->decimals;
    bool null_value=item->null_value;
6630
    new_item= (null_value ? (Item*) new Item_null(name) : (Item*)
unknown's avatar
unknown committed
6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646
               new Item_float(name, result, decimals, length));
    break;
  }
  case DECIMAL_RESULT:
  {
    my_decimal decimal_value;
    my_decimal *result= item->val_decimal(&decimal_value);
    uint length= item->max_length, decimals= item->decimals;
    bool null_value= item->null_value;
    new_item= (null_value ?
               (Item*) new Item_null(name) :
               (Item*) new Item_decimal(name, result, length, decimals));
    break;
  }
  default:
    DBUG_ASSERT(0);
unknown's avatar
unknown committed
6647
  }
6648 6649
  if (new_item)
    thd->change_item_tree(ref, new_item);
unknown's avatar
unknown committed
6650 6651
}

unknown's avatar
unknown committed
6652 6653 6654 6655
/**
  Return true if the value stored in the field is equal to the const
  item.

unknown's avatar
unknown committed
6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668
  We need to use this on the range optimizer because in some cases
  we can't store the value in the field without some precision/character loss.
*/

bool field_is_equal_to_item(Field *field,Item *item)
{

  Item_result res_type=item_cmp_type(field->result_type(),
				     item->result_type());
  if (res_type == STRING_RESULT)
  {
    char item_buff[MAX_FIELD_WIDTH];
    char field_buff[MAX_FIELD_WIDTH];
unknown's avatar
unknown committed
6669 6670
    String item_tmp(item_buff,sizeof(item_buff),&my_charset_bin),*item_result;
    String field_tmp(field_buff,sizeof(field_buff),&my_charset_bin);
unknown's avatar
unknown committed
6671 6672 6673
    item_result=item->val_str(&item_tmp);
    if (item->null_value)
      return 1;					// This must be true
6674
    field->val_str(&field_tmp);
unknown's avatar
unknown committed
6675
    return !stringcmp(&field_tmp,item_result);
unknown's avatar
unknown committed
6676 6677 6678
  }
  if (res_type == INT_RESULT)
    return 1;					// Both where of type int
unknown's avatar
unknown committed
6679 6680 6681 6682 6683 6684 6685 6686 6687 6688
  if (res_type == DECIMAL_RESULT)
  {
    my_decimal item_buf, *item_val,
               field_buf, *field_val;
    item_val= item->val_decimal(&item_buf);
    if (item->null_value)
      return 1;					// This must be true
    field_val= field->val_decimal(&field_buf);
    return !my_decimal_cmp(item_val, field_val);
  }
6689
  double result= item->val_real();
unknown's avatar
unknown committed
6690 6691 6692 6693 6694
  if (item->null_value)
    return 1;
  return result == field->val_real();
}

6695
Item_cache* Item_cache::get_cache(const Item *item)
6696
{
6697
  switch (item->result_type()) {
6698 6699 6700 6701
  case INT_RESULT:
    return new Item_cache_int();
  case REAL_RESULT:
    return new Item_cache_real();
unknown's avatar
unknown committed
6702 6703
  case DECIMAL_RESULT:
    return new Item_cache_decimal();
6704
  case STRING_RESULT:
6705
    return new Item_cache_str(item);
unknown's avatar
unknown committed
6706 6707
  case ROW_RESULT:
    return new Item_cache_row();
6708 6709 6710 6711 6712 6713 6714
  default:
    // should never be in real life
    DBUG_ASSERT(0);
    return 0;
  }
}

unknown's avatar
unknown committed
6715

6716
void Item_cache::print(String *str, enum_query_type query_type)
unknown's avatar
unknown committed
6717
{
6718
  str->append(STRING_WITH_LEN("<cache>("));
unknown's avatar
unknown committed
6719
  if (example)
6720
    example->print(str, query_type);
unknown's avatar
unknown committed
6721
  else
6722
    Item::print(str, query_type);
unknown's avatar
unknown committed
6723 6724 6725 6726 6727 6728 6729 6730
  str->append(')');
}


void Item_cache_int::store(Item *item)
{
  value= item->val_int_result();
  null_value= item->null_value;
unknown's avatar
unknown committed
6731 6732 6733 6734
  unsigned_flag= item->unsigned_flag;
}


6735 6736 6737 6738 6739 6740 6741 6742
void Item_cache_int::store(Item *item, longlong val_arg)
{
  value= val_arg;
  null_value= item->null_value;
  unsigned_flag= item->unsigned_flag;
}


unknown's avatar
unknown committed
6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755
String *Item_cache_int::val_str(String *str)
{
  DBUG_ASSERT(fixed == 1);
  str->set(value, default_charset());
  return str;
}


my_decimal *Item_cache_int::val_decimal(my_decimal *decimal_val)
{
  DBUG_ASSERT(fixed == 1);
  int2my_decimal(E_DEC_FATAL_ERROR, value, unsigned_flag, decimal_val);
  return decimal_val;
unknown's avatar
unknown committed
6756 6757 6758 6759 6760 6761 6762 6763 6764 6765
}


void Item_cache_real::store(Item *item)
{
  value= item->val_result();
  null_value= item->null_value;
}


unknown's avatar
unknown committed
6766 6767 6768
longlong Item_cache_real::val_int()
{
  DBUG_ASSERT(fixed == 1);
6769
  return (longlong) rint(value);
unknown's avatar
unknown committed
6770 6771 6772 6773 6774 6775
}


String* Item_cache_real::val_str(String *str)
{
  DBUG_ASSERT(fixed == 1);
6776
  str->set_real(value, decimals, default_charset());
unknown's avatar
unknown committed
6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791
  return str;
}


my_decimal *Item_cache_real::val_decimal(my_decimal *decimal_val)
{
  DBUG_ASSERT(fixed == 1);
  double2my_decimal(E_DEC_FATAL_ERROR, value, decimal_val);
  return decimal_val;
}


void Item_cache_decimal::store(Item *item)
{
  my_decimal *val= item->val_decimal_result(&decimal_value);
6792
  if (!(null_value= item->null_value) && val != &decimal_value)
unknown's avatar
unknown committed
6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818 6819 6820 6821 6822 6823 6824 6825 6826 6827
    my_decimal2decimal(val, &decimal_value);
}

double Item_cache_decimal::val_real()
{
  DBUG_ASSERT(fixed);
  double res;
  my_decimal2double(E_DEC_FATAL_ERROR, &decimal_value, &res);
  return res;
}

longlong Item_cache_decimal::val_int()
{
  DBUG_ASSERT(fixed);
  longlong res;
  my_decimal2int(E_DEC_FATAL_ERROR, &decimal_value, unsigned_flag, &res);
  return res;
}

String* Item_cache_decimal::val_str(String *str)
{
  DBUG_ASSERT(fixed);
  my_decimal_round(E_DEC_FATAL_ERROR, &decimal_value, decimals, FALSE,
                   &decimal_value);
  my_decimal2string(E_DEC_FATAL_ERROR, &decimal_value, 0, 0, 0, str);
  return str;
}

my_decimal *Item_cache_decimal::val_decimal(my_decimal *val)
{
  DBUG_ASSERT(fixed);
  return &decimal_value;
}


6828 6829
void Item_cache_str::store(Item *item)
{
unknown's avatar
merge  
unknown committed
6830
  value_buff.set(buffer, sizeof(buffer), item->collation.collation);
6831
  value= item->str_result(&value_buff);
6832 6833
  if ((null_value= item->null_value))
    value= 0;
6834
  else if (value != &value_buff)
6835 6836 6837 6838 6839 6840 6841 6842 6843
  {
    /*
      We copy string value to avoid changing value if 'item' is table field
      in queries like following (where t1.c is varchar):
      select a, 
             (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),
             (select c from t1 where a=t2.a)
        from t2;
    */
6844 6845
    value_buff.copy(*value);
    value= &value_buff;
6846 6847
  }
}
6848

6849
double Item_cache_str::val_real()
6850 6851
{
  DBUG_ASSERT(fixed == 1);
6852 6853
  int err_not_used;
  char *end_not_used;
6854
  if (value)
6855
    return my_strntod(value->charset(), (char*) value->ptr(),
6856 6857
		      value->length(), &end_not_used, &err_not_used);
  return (double) 0;
6858
}
6859 6860


6861 6862
longlong Item_cache_str::val_int()
{
6863
  DBUG_ASSERT(fixed == 1);
6864
  int err;
6865 6866
  if (value)
    return my_strntoll(value->charset(), value->ptr(),
6867
		       value->length(), 10, (char**) 0, &err);
6868 6869 6870
  else
    return (longlong)0;
}
unknown's avatar
unknown committed
6871

unknown's avatar
unknown committed
6872 6873 6874 6875 6876 6877 6878 6879 6880 6881
my_decimal *Item_cache_str::val_decimal(my_decimal *decimal_val)
{
  DBUG_ASSERT(fixed == 1);
  if (value)
    string2my_decimal(E_DEC_FATAL_ERROR, value, decimal_val);
  else
    decimal_val= 0;
  return decimal_val;
}

6882

6883 6884 6885 6886 6887 6888 6889 6890
int Item_cache_str::save_in_field(Field *field, bool no_conversions)
{
  int res= Item_cache::save_in_field(field, no_conversions);
  return (is_varbinary && field->type() == MYSQL_TYPE_STRING &&
          value->length() < field->field_length) ? 1 : res;
}


unknown's avatar
unknown committed
6891 6892
bool Item_cache_row::allocate(uint num)
{
unknown's avatar
unknown committed
6893
  item_count= num;
unknown's avatar
unknown committed
6894
  THD *thd= current_thd;
unknown's avatar
unknown committed
6895 6896
  return (!(values= 
	    (Item_cache **) thd->calloc(sizeof(Item_cache *)*item_count)));
unknown's avatar
unknown committed
6897 6898
}

6899

unknown's avatar
unknown committed
6900 6901
bool Item_cache_row::setup(Item * item)
{
unknown's avatar
unknown committed
6902
  example= item;
unknown's avatar
unknown committed
6903 6904
  if (!values && allocate(item->cols()))
    return 1;
unknown's avatar
unknown committed
6905
  for (uint i= 0; i < item_count; i++)
unknown's avatar
unknown committed
6906
  {
6907
    Item *el= item->element_index(i);
unknown's avatar
unknown committed
6908
    Item_cache *tmp;
6909
    if (!(tmp= values[i]= Item_cache::get_cache(el)))
unknown's avatar
unknown committed
6910
      return 1;
unknown's avatar
unknown committed
6911
    tmp->setup(el);
unknown's avatar
unknown committed
6912 6913 6914 6915
  }
  return 0;
}

6916

unknown's avatar
unknown committed
6917 6918 6919 6920
void Item_cache_row::store(Item * item)
{
  null_value= 0;
  item->bring_value();
unknown's avatar
unknown committed
6921
  for (uint i= 0; i < item_count; i++)
unknown's avatar
unknown committed
6922
  {
6923
    values[i]->store(item->element_index(i));
unknown's avatar
unknown committed
6924 6925 6926 6927
    null_value|= values[i]->null_value;
  }
}

6928

unknown's avatar
unknown committed
6929 6930 6931 6932 6933
void Item_cache_row::illegal_method_call(const char *method)
{
  DBUG_ENTER("Item_cache_row::illegal_method_call");
  DBUG_PRINT("error", ("!!! %s method was called for row item", method));
  DBUG_ASSERT(0);
unknown's avatar
unknown committed
6934
  my_error(ER_OPERAND_COLUMNS, MYF(0), 1);
unknown's avatar
unknown committed
6935 6936 6937
  DBUG_VOID_RETURN;
}

6938

unknown's avatar
unknown committed
6939 6940
bool Item_cache_row::check_cols(uint c)
{
unknown's avatar
unknown committed
6941
  if (c != item_count)
unknown's avatar
unknown committed
6942
  {
unknown's avatar
unknown committed
6943
    my_error(ER_OPERAND_COLUMNS, MYF(0), c);
unknown's avatar
unknown committed
6944 6945 6946 6947 6948
    return 1;
  }
  return 0;
}

6949

unknown's avatar
unknown committed
6950 6951
bool Item_cache_row::null_inside()
{
unknown's avatar
unknown committed
6952
  for (uint i= 0; i < item_count; i++)
unknown's avatar
unknown committed
6953 6954 6955 6956 6957 6958 6959 6960
  {
    if (values[i]->cols() > 1)
    {
      if (values[i]->null_inside())
	return 1;
    }
    else
    {
6961
      values[i]->update_null_value();
unknown's avatar
unknown committed
6962 6963 6964 6965 6966 6967 6968
      if (values[i]->null_value)
	return 1;
    }
  }
  return 0;
}

6969

unknown's avatar
unknown committed
6970 6971
void Item_cache_row::bring_value()
{
unknown's avatar
unknown committed
6972
  for (uint i= 0; i < item_count; i++)
unknown's avatar
unknown committed
6973 6974 6975
    values[i]->bring_value();
  return;
}
unknown's avatar
unknown committed
6976

6977

6978 6979
Item_type_holder::Item_type_holder(THD *thd, Item *item)
  :Item(thd, item), enum_set_typelib(0), fld_type(get_real_type(item))
6980 6981
{
  DBUG_ASSERT(item->fixed);
6982
  maybe_null= item->maybe_null;
6983
  collation.set(item->collation);
6984
  get_full_info(item);
unknown's avatar
unknown committed
6985 6986 6987
  /* fix variable decimals which always is NOT_FIXED_DEC */
  if (Field::result_merge_type(fld_type) == INT_RESULT)
    decimals= 0;
unknown's avatar
unknown committed
6988
  prev_decimal_int_part= item->decimal_int_part();
6989
#ifdef HAVE_SPATIAL
6990
  if (item->field_type() == MYSQL_TYPE_GEOMETRY)
6991
    geometry_type= item->get_geometry_type();
6992
#endif /* HAVE_SPATIAL */
6993 6994 6995
}


unknown's avatar
unknown committed
6996 6997
/**
  Return expression type of Item_type_holder.
6998

unknown's avatar
unknown committed
6999 7000
  @return
    Item_result (type of internal MySQL expression result)
7001 7002
*/

7003
Item_result Item_type_holder::result_type() const
7004
{
7005
  return Field::result_merge_type(fld_type);
7006
}
7007

7008

unknown's avatar
unknown committed
7009 7010
/**
  Find real field type of item.
unknown's avatar
unknown committed
7011

unknown's avatar
unknown committed
7012
  @return
7013
    type of field which should be created to store item value
unknown's avatar
unknown committed
7014 7015
*/

7016
enum_field_types Item_type_holder::get_real_type(Item *item)
7017
{
7018
  switch(item->type())
7019
  {
7020
  case FIELD_ITEM:
7021
  {
unknown's avatar
unknown committed
7022
    /*
7023 7024
      Item_fields::field_type ask Field_type() but sometimes field return
      a different type, like for enum/set, so we need to ask real type.
unknown's avatar
unknown committed
7025
    */
7026 7027
    Field *field= ((Item_field *) item)->field;
    enum_field_types type= field->real_type();
7028 7029
    if (field->is_created_from_null_item)
      return MYSQL_TYPE_NULL;
7030 7031 7032 7033
    /* work around about varchar type field detection */
    if (type == MYSQL_TYPE_STRING && field->type() == MYSQL_TYPE_VAR_STRING)
      return MYSQL_TYPE_VAR_STRING;
    return type;
7034
  }
7035
  case SUM_FUNC_ITEM:
7036
  {
7037 7038 7039 7040
    /*
      Argument of aggregate function sometimes should be asked about field
      type
    */
7041 7042
    Item_sum *item_sum= (Item_sum *) item;
    if (item_sum->keep_field_type())
7043
      return get_real_type(item_sum->get_arg(0));
7044 7045 7046
    break;
  }
  case FUNC_ITEM:
unknown's avatar
unknown committed
7047
    if (((Item_func *) item)->functype() == Item_func::GUSERVAR_FUNC)
7048
    {
7049
      /*
7050 7051 7052 7053
        There are work around of problem with changing variable type on the
        fly and variable always report "string" as field type to get
        acceptable information for client in send_field, so we make field
        type from expression type.
7054
      */
unknown's avatar
unknown committed
7055
      switch (item->result_type()) {
7056 7057 7058 7059 7060 7061
      case STRING_RESULT:
        return MYSQL_TYPE_VAR_STRING;
      case INT_RESULT:
        return MYSQL_TYPE_LONGLONG;
      case REAL_RESULT:
        return MYSQL_TYPE_DOUBLE;
unknown's avatar
unknown committed
7062 7063
      case DECIMAL_RESULT:
        return MYSQL_TYPE_NEWDECIMAL;
7064 7065 7066 7067 7068
      case ROW_RESULT:
      default:
        DBUG_ASSERT(0);
        return MYSQL_TYPE_VAR_STRING;
      }
7069
    }
7070 7071 7072
    break;
  default:
    break;
7073
  }
7074
  return item->field_type();
7075 7076
}

unknown's avatar
unknown committed
7077
/**
7078 7079
  Find field type which can carry current Item_type_holder type and
  type of given Item.
7080

unknown's avatar
unknown committed
7081 7082
  @param thd     thread handler
  @param item    given item to join its parameters with this item ones
7083

unknown's avatar
unknown committed
7084
  @retval
7085
    TRUE   error - types are incompatible
unknown's avatar
unknown committed
7086
  @retval
7087
    FALSE  OK
7088 7089
*/

7090
bool Item_type_holder::join_types(THD *thd, Item *item)
7091
{
unknown's avatar
unknown committed
7092 7093
  uint max_length_orig= max_length;
  uint decimals_orig= decimals;
unknown's avatar
unknown committed
7094 7095 7096 7097 7098 7099 7100
  DBUG_ENTER("Item_type_holder::join_types");
  DBUG_PRINT("info:", ("was type %d len %d, dec %d name %s",
                       fld_type, max_length, decimals,
                       (name ? name : "<NULL>")));
  DBUG_PRINT("info:", ("in type %d len %d, dec %d",
                       get_real_type(item),
                       item->max_length, item->decimals));
7101
  fld_type= Field::field_type_merge(fld_type, get_real_type(item));
7102
  {
unknown's avatar
unknown committed
7103 7104 7105 7106 7107
    int item_decimals= item->decimals;
    /* fix variable decimals which always is NOT_FIXED_DEC */
    if (Field::result_merge_type(fld_type) == INT_RESULT)
      item_decimals= 0;
    decimals= max(decimals, item_decimals);
7108
  }
unknown's avatar
unknown committed
7109
  if (Field::result_merge_type(fld_type) == DECIMAL_RESULT)
7110
  {
unknown's avatar
unknown committed
7111
    decimals= min(max(decimals, item->decimals), DECIMAL_MAX_SCALE);
7112 7113 7114
    int item_int_part= item->decimal_int_part();
    int item_prec = max(prev_decimal_int_part, item_int_part) + decimals;
    int precision= min(item_prec, DECIMAL_MAX_PRECISION);
unknown's avatar
unknown committed
7115 7116 7117
    unsigned_flag&= item->unsigned_flag;
    max_length= my_decimal_precision_to_length(precision, decimals,
                                               unsigned_flag);
7118
  }
7119

unknown's avatar
unknown committed
7120 7121 7122
  switch (Field::result_merge_type(fld_type))
  {
  case STRING_RESULT:
7123
  {
7124
    const char *old_cs, *old_derivation;
7125
    uint32 old_max_chars= max_length / collation.collation->mbmaxlen;
7126 7127
    old_cs= collation.collation->name;
    old_derivation= collation.derivation_name();
7128
    if (collation.aggregate(item->collation, MY_COLL_ALLOW_CONV))
7129
    {
7130
      my_error(ER_CANT_AGGREGATE_2COLLATIONS, MYF(0),
7131 7132 7133 7134
	       old_cs, old_derivation,
	       item->collation.collation->name,
	       item->collation.derivation_name(),
	       "UNION");
unknown's avatar
unknown committed
7135
      DBUG_RETURN(TRUE);
7136
    }
7137 7138 7139 7140 7141
    /*
      To figure out max_length, we have to take into account possible
      expansion of the size of the values because of character set
      conversions.
     */
unknown's avatar
unknown committed
7142 7143 7144 7145 7146 7147 7148 7149 7150
    if (collation.collation != &my_charset_bin)
    {
      max_length= max(old_max_chars * collation.collation->mbmaxlen,
                      display_length(item) /
                      item->collation.collation->mbmaxlen *
                      collation.collation->mbmaxlen);
    }
    else
      set_if_bigger(max_length, display_length(item));
unknown's avatar
unknown committed
7151
    break;
7152
  }
unknown's avatar
unknown committed
7153 7154 7155 7156 7157 7158
  case REAL_RESULT:
  {
    if (decimals != NOT_FIXED_DEC)
    {
      int delta1= max_length_orig - decimals_orig;
      int delta2= item->max_length - item->decimals;
7159 7160 7161 7162 7163 7164 7165 7166 7167 7168 7169
      max_length= max(delta1, delta2) + decimals;
      if (fld_type == MYSQL_TYPE_FLOAT && max_length > FLT_DIG + 2) 
      {
        max_length= FLT_DIG + 6;
        decimals= NOT_FIXED_DEC;
      } 
      if (fld_type == MYSQL_TYPE_DOUBLE && max_length > DBL_DIG + 2) 
      {
        max_length= DBL_DIG + 7;
        decimals= NOT_FIXED_DEC;
      }
unknown's avatar
unknown committed
7170 7171 7172 7173
    }
    else
      max_length= (fld_type == MYSQL_TYPE_FLOAT) ? FLT_DIG+6 : DBL_DIG+7;
    break;
7174
  }
7175 7176
  default:
    max_length= max(max_length, display_length(item));
unknown's avatar
unknown committed
7177
  };
7178 7179
  maybe_null|= item->maybe_null;
  get_full_info(item);
unknown's avatar
unknown committed
7180 7181 7182

  /* Remember decimal integer part to be used in DECIMAL_RESULT handleng */
  prev_decimal_int_part= decimal_int_part();
7183 7184
  DBUG_PRINT("info", ("become type: %d  len: %u  dec: %u",
                      (int) fld_type, max_length, (uint) decimals));
unknown's avatar
unknown committed
7185
  DBUG_RETURN(FALSE);
7186 7187
}

unknown's avatar
unknown committed
7188 7189
/**
  Calculate lenth for merging result for given Item type.
7190

unknown's avatar
unknown committed
7191
  @param item  Item for length detection
7192

unknown's avatar
unknown committed
7193
  @return
7194 7195
    length
*/
7196

7197
uint32 Item_type_holder::display_length(Item *item)
7198 7199
{
  if (item->type() == Item::FIELD_ITEM)
unknown's avatar
unknown committed
7200
    return ((Item_field *)item)->max_disp_length();
7201

7202
  switch (item->field_type())
7203
  {
7204 7205 7206 7207 7208 7209 7210
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_YEAR:
  case MYSQL_TYPE_NEWDATE:
unknown's avatar
unknown committed
7211 7212 7213
  case MYSQL_TYPE_VARCHAR:
  case MYSQL_TYPE_BIT:
  case MYSQL_TYPE_NEWDECIMAL:
7214 7215 7216 7217 7218 7219 7220 7221 7222
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
  case MYSQL_TYPE_GEOMETRY:
7223
    return item->max_length;
7224 7225 7226 7227 7228
  case MYSQL_TYPE_TINY:
    return 4;
  case MYSQL_TYPE_SHORT:
    return 6;
  case MYSQL_TYPE_LONG:
7229
    return MY_INT32_NUM_DECIMAL_DIGITS;
7230 7231 7232
  case MYSQL_TYPE_FLOAT:
    return 25;
  case MYSQL_TYPE_DOUBLE:
7233
    return 53;
7234
  case MYSQL_TYPE_NULL:
7235
    return 0;
7236
  case MYSQL_TYPE_LONGLONG:
7237
    return 20;
7238 7239
  case MYSQL_TYPE_INT24:
    return 8;
7240 7241 7242 7243 7244
  default:
    DBUG_ASSERT(0); // we should never go there
    return 0;
  }
}
7245

7246

unknown's avatar
unknown committed
7247
/**
7248
  Make temporary table field according collected information about type
unknown's avatar
unknown committed
7249
  of UNION result.
7250

unknown's avatar
unknown committed
7251
  @param table  temporary table for which we create fields
7252

unknown's avatar
unknown committed
7253
  @return
7254 7255 7256 7257 7258
    created field
*/

Field *Item_type_holder::make_field_by_type(TABLE *table)
{
unknown's avatar
unknown committed
7259 7260 7261 7262
  /*
    The field functions defines a field to be not null if null_ptr is not 0
  */
  uchar *null_ptr= maybe_null ? (uchar*) "" : 0;
unknown's avatar
unknown committed
7263 7264 7265
  Field *field;

  switch (fld_type) {
unknown's avatar
unknown committed
7266
  case MYSQL_TYPE_ENUM:
7267
    DBUG_ASSERT(enum_set_typelib);
7268
    field= new Field_enum((uchar *) 0, max_length, null_ptr, 0,
unknown's avatar
unknown committed
7269
                          Field::NONE, name,
unknown's avatar
unknown committed
7270
                          get_enum_pack_length(enum_set_typelib->count),
unknown's avatar
unknown committed
7271
                          enum_set_typelib, collation.collation);
unknown's avatar
unknown committed
7272 7273 7274
    if (field)
      field->init(table);
    return field;
unknown's avatar
unknown committed
7275 7276
  case MYSQL_TYPE_SET:
    DBUG_ASSERT(enum_set_typelib);
7277
    field= new Field_set((uchar *) 0, max_length, null_ptr, 0,
unknown's avatar
unknown committed
7278
                         Field::NONE, name,
unknown's avatar
unknown committed
7279
                         get_set_pack_length(enum_set_typelib->count),
unknown's avatar
unknown committed
7280
                         enum_set_typelib, collation.collation);
unknown's avatar
unknown committed
7281 7282 7283
    if (field)
      field->init(table);
    return field;
7284 7285
  case MYSQL_TYPE_NULL:
    return make_string_field(table);
unknown's avatar
unknown committed
7286 7287
  default:
    break;
7288
  }
unknown's avatar
unknown committed
7289
  return tmp_table_field_from_field_type(table, 0);
7290 7291 7292
}


unknown's avatar
unknown committed
7293
/**
7294
  Get full information from Item about enum/set fields to be able to create
unknown's avatar
unknown committed
7295
  them later.
7296

unknown's avatar
unknown committed
7297
  @param item    Item for information collection
7298 7299 7300 7301 7302 7303
*/
void Item_type_holder::get_full_info(Item *item)
{
  if (fld_type == MYSQL_TYPE_ENUM ||
      fld_type == MYSQL_TYPE_SET)
  {
7304 7305 7306
    if (item->type() == Item::SUM_FUNC_ITEM &&
        (((Item_sum*)item)->sum_func() == Item_sum::MAX_FUNC ||
         ((Item_sum*)item)->sum_func() == Item_sum::MIN_FUNC))
7307
      item = ((Item_sum*)item)->get_arg(0);
7308
    /*
7309 7310
      We can have enum/set type after merging only if we have one enum|set
      field (or MIN|MAX(enum|set field)) and number of NULL fields
7311 7312 7313 7314 7315 7316 7317 7318 7319 7320 7321 7322 7323 7324 7325 7326
    */
    DBUG_ASSERT((enum_set_typelib &&
                 get_real_type(item) == MYSQL_TYPE_NULL) ||
                (!enum_set_typelib &&
                 item->type() == Item::FIELD_ITEM &&
                 (get_real_type(item) == MYSQL_TYPE_ENUM ||
                  get_real_type(item) == MYSQL_TYPE_SET) &&
                 ((Field_enum*)((Item_field *) item)->field)->typelib));
    if (!enum_set_typelib)
    {
      enum_set_typelib= ((Field_enum*)((Item_field *) item)->field)->typelib;
    }
  }
}


7327
double Item_type_holder::val_real()
7328 7329 7330 7331 7332 7333 7334 7335 7336 7337 7338 7339
{
  DBUG_ASSERT(0); // should never be called
  return 0.0;
}


longlong Item_type_holder::val_int()
{
  DBUG_ASSERT(0); // should never be called
  return 0;
}

unknown's avatar
unknown committed
7340 7341 7342 7343 7344
my_decimal *Item_type_holder::val_decimal(my_decimal *)
{
  DBUG_ASSERT(0); // should never be called
  return 0;
}
7345 7346 7347 7348 7349 7350 7351

String *Item_type_holder::val_str(String*)
{
  DBUG_ASSERT(0); // should never be called
  return 0;
}

7352 7353 7354 7355 7356 7357 7358 7359
void Item_result_field::cleanup()
{
  DBUG_ENTER("Item_result_field::cleanup()");
  Item::cleanup();
  result_field= 0;
  DBUG_VOID_RETURN;
}

unknown's avatar
unknown committed
7360 7361
/**
  Dummy error processor used by default by Name_resolution_context.
7362

unknown's avatar
unknown committed
7363
  @note
7364 7365 7366 7367 7368 7369
    do nothing
*/

void dummy_error_processor(THD *thd, void *data)
{}

unknown's avatar
unknown committed
7370 7371 7372
/**
  Wrapper of hide_view_error call for Name_resolution_context error
  processor.
7373

unknown's avatar
unknown committed
7374
  @note
7375 7376 7377 7378 7379 7380 7381 7382
    hide view underlying tables details in error messages
*/

void view_error_processor(THD *thd, void *data)
{
  ((TABLE_LIST *)data)->hide_view_error(thd);
}

unknown's avatar
unknown committed
7383 7384 7385 7386
/*****************************************************************************
** Instantiate templates
*****************************************************************************/

7387
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
unknown's avatar
unknown committed
7388 7389
template class List<Item>;
template class List_iterator<Item>;
unknown's avatar
unknown committed
7390
template class List_iterator_fast<Item>;
7391
template class List_iterator_fast<Item_field>;
unknown's avatar
unknown committed
7392 7393
template class List<List_item>;
#endif