item_cmpfunc.cc 88.8 KB
Newer Older
1
/* Copyright (C) 2000-2003 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
unknown's avatar
unknown committed
2

unknown's avatar
unknown committed
3 4 5 6
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
unknown's avatar
unknown committed
7

unknown's avatar
unknown committed
8 9 10 11
   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
12

unknown's avatar
unknown committed
13 14 15 16 17 18 19
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* This file defines all compare functions */

20
#ifdef USE_PRAGMA_IMPLEMENTATION
unknown's avatar
unknown committed
21 22 23 24 25
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
#include <m_ctype.h>
26
#include "sql_select.h"
27

28 29
static bool convert_constant_item(THD *thd, Field *field, Item **item);

30 31 32 33 34 35
static Item_result item_store_type(Item_result a,Item_result b)
{
  if (a == STRING_RESULT || b == STRING_RESULT)
    return STRING_RESULT;
  else if (a == REAL_RESULT || b == REAL_RESULT)
    return REAL_RESULT;
unknown's avatar
unknown committed
36 37
  else if (a == DECIMAL_RESULT || b == DECIMAL_RESULT)
    return DECIMAL_RESULT;
38 39 40 41 42 43 44 45 46 47 48 49
  else
    return INT_RESULT;
}

static void agg_result_type(Item_result *type, Item **items, uint nitems)
{
  uint i;
  type[0]= items[0]->result_type();
  for (i=1 ; i < nitems ; i++)
    type[0]= item_store_type(type[0], items[i]->result_type());
}

50 51

static void agg_cmp_type(THD *thd, Item_result *type, Item **items, uint nitems)
52 53
{
  uint i;
54 55 56 57 58 59 60 61 62 63
  Field *field= NULL;
  bool all_constant= TRUE;

  /* If the first argument is a FIELD_ITEM, pull out the field. */
  if (items[0]->type() == Item::FIELD_ITEM)
    field=((Item_field *)items[0])->field;
  /* But if it can't be compared as a longlong, we don't really care. */
  if (field && !field->can_be_compared_as_longlong())
    field= NULL;

64
  type[0]= items[0]->result_type();
65 66
  for (i= 1; i < nitems; i++)
  {
67
    type[0]= item_cmp_type(type[0], items[i]->result_type());
68 69 70 71 72 73 74 75 76 77
    if (field && !convert_constant_item(thd, field, &items[i]))
      all_constant= FALSE;
  }

  /*
    If we had a field that can be compared as a longlong, and all constant
    items, then the aggregate result will be an INT_RESULT.
  */
  if (field && all_constant)
    type[0]= INT_RESULT;
78 79
}

80

unknown's avatar
unknown committed
81 82
static void my_coll_agg_error(DTCollation &c1, DTCollation &c2,
                              const char *fname)
83
{
84 85 86 87
  my_error(ER_CANT_AGGREGATE_2COLLATIONS, MYF(0),
           c1.collation->name,c1.derivation_name(),
           c2.collation->name,c2.derivation_name(),
           fname);
88 89
}

unknown's avatar
unknown committed
90 91

Item_bool_func2* Eq_creator::create(Item *a, Item *b) const
unknown's avatar
unknown committed
92 93 94
{
  return new Item_func_eq(a, b);
}
unknown's avatar
unknown committed
95 96 97


Item_bool_func2* Ne_creator::create(Item *a, Item *b) const
unknown's avatar
unknown committed
98 99 100
{
  return new Item_func_ne(a, b);
}
unknown's avatar
unknown committed
101 102 103


Item_bool_func2* Gt_creator::create(Item *a, Item *b) const
unknown's avatar
unknown committed
104 105 106
{
  return new Item_func_gt(a, b);
}
unknown's avatar
unknown committed
107 108 109


Item_bool_func2* Lt_creator::create(Item *a, Item *b) const
unknown's avatar
unknown committed
110 111 112
{
  return new Item_func_lt(a, b);
}
unknown's avatar
unknown committed
113 114 115


Item_bool_func2* Ge_creator::create(Item *a, Item *b) const
unknown's avatar
unknown committed
116 117 118
{
  return new Item_func_ge(a, b);
}
unknown's avatar
unknown committed
119 120 121


Item_bool_func2* Le_creator::create(Item *a, Item *b) const
unknown's avatar
unknown committed
122 123 124
{
  return new Item_func_le(a, b);
}
unknown's avatar
unknown committed
125

unknown's avatar
unknown committed
126
/*
127
  Test functions
128 129
  Most of these  returns 0LL if false and 1LL if true and
  NULL if some arg is NULL.
unknown's avatar
unknown committed
130 131 132 133
*/

longlong Item_func_not::val_int()
{
134
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
135
  bool value= args[0]->val_bool();
unknown's avatar
unknown committed
136
  null_value=args[0]->null_value;
137
  return ((!null_value && value == 0) ? 1 : 0);
unknown's avatar
unknown committed
138 139
}

140 141 142 143 144
/*
  special NOT for ALL subquery
*/

longlong Item_func_not_all::val_int()
145 146
{
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
147
  bool value= args[0]->val_bool();
148 149

  /*
unknown's avatar
unknown committed
150 151
    return TRUE if there was records in underlying select in max/min
    optimization (ALL subquery)
152 153 154 155
  */
  if (empty_underlying_subquery())
    return 1;

156
  null_value= args[0]->null_value;
157 158 159 160 161 162 163 164
  return ((!null_value && value == 0) ? 1 : 0);
}


bool Item_func_not_all::empty_underlying_subquery()
{
  return ((test_sum_item && !test_sum_item->any_value()) ||
          (test_sub_item && !test_sub_item->any_value()));
165 166
}

unknown's avatar
unknown committed
167 168 169 170 171 172 173 174
void Item_func_not_all::print(String *str)
{
  if (show)
    Item_func::print(str);
  else
    args[0]->print(str);
}

175 176

/*
unknown's avatar
unknown committed
177
  Special NOP (No OPeration) for ALL subquery it is like  Item_func_not_all
unknown's avatar
unknown committed
178
  (return TRUE if underlying subquery do not return rows) but if subquery
unknown's avatar
unknown committed
179
  returns some rows it return same value as argument (TRUE/FALSE).
180 181 182 183 184
*/

longlong Item_func_nop_all::val_int()
{
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
185
  longlong value= args[0]->val_int();
186 187

  /*
unknown's avatar
unknown committed
188 189
    return FALSE if there was records in underlying select in max/min
    optimization (SAME/ANY subquery)
190 191
  */
  if (empty_underlying_subquery())
unknown's avatar
unknown committed
192
    return 0;
193 194 195 196 197 198

  null_value= args[0]->null_value;
  return (null_value || value == 0) ? 0 : 1;
}


unknown's avatar
unknown committed
199 200 201 202 203
/*
  Convert a constant expression or string to an integer.
  This is done when comparing DATE's of different formats and
  also when comparing bigint to strings (in which case the string
  is converted once to a bigint).
unknown's avatar
unknown committed
204 205 206 207

  RESULT VALUES
  0	Can't convert item
  1	Item was replaced with an integer version of the item
unknown's avatar
unknown committed
208
*/
unknown's avatar
unknown committed
209

210
static bool convert_constant_item(THD *thd, Field *field, Item **item)
unknown's avatar
unknown committed
211
{
212
  if ((*item)->const_item())
unknown's avatar
unknown committed
213
  {
214 215 216
    /* For comparison purposes allow invalid dates like 2000-01-32 */
    ulong orig_sql_mode= field->table->in_use->variables.sql_mode;
    field->table->in_use->variables.sql_mode|= MODE_INVALID_DATES;
unknown's avatar
unknown committed
217
    if (!(*item)->save_in_field(field, 1) && !((*item)->null_value))
unknown's avatar
unknown committed
218
    {
unknown's avatar
unknown committed
219 220
      Item *tmp=new Item_int_with_ref(field->val_int(), *item,
                                      test(field->flags & UNSIGNED_FLAG));
221
      field->table->in_use->variables.sql_mode= orig_sql_mode;
222
      if (tmp)
223
        thd->change_item_tree(item, tmp);
224
      return 1;					// Item was replaced
unknown's avatar
unknown committed
225
    }
226
    field->table->in_use->variables.sql_mode= orig_sql_mode;
unknown's avatar
unknown committed
227 228 229 230
  }
  return 0;
}

unknown's avatar
unknown committed
231

232 233 234
void Item_bool_func2::fix_length_and_dec()
{
  max_length= 1;				     // Function returns 0 or 1
235
  THD *thd= current_thd;
236 237 238 239 240 241 242

  /*
    As some compare functions are generated after sql_yacc,
    we have to check for out of memory conditions here
  */
  if (!args[0] || !args[1])
    return;
243 244 245 246 247 248 249 250 251 252 253 254 255

  /* 
    We allow to convert to Unicode character sets in some cases.
    The conditions when conversion is possible are:
    - arguments A and B have different charsets
    - A wins according to coercibility rules
    - character set of A is superset for character set of B
   
    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.
  */

256
  
257 258 259
  DTCollation coll;
  if (args[0]->result_type() == STRING_RESULT &&
      args[1]->result_type() == STRING_RESULT &&
unknown's avatar
unknown committed
260 261
      agg_arg_charsets(coll, args, 2, MY_COLL_CMP_CONV))
    return;
262 263
    
 
unknown's avatar
unknown committed
264
  // Make a special case of compare with fields to get nicer DATE comparisons
unknown's avatar
unknown committed
265 266 267 268 269 270

  if (functype() == LIKE_FUNC)  // Disable conversion in case of LIKE function.
  {
    set_cmp_func();
    return;
  }
271 272

  if (!thd->is_context_analysis_only())
unknown's avatar
unknown committed
273
  {
274 275
    Item *real_item= args[0]->real_item();
    if (real_item->type() == FIELD_ITEM)
unknown's avatar
unknown committed
276
    {
277
      Field *field=((Item_field*) real_item)->field;
278
      if (field->can_be_compared_as_longlong())
unknown's avatar
unknown committed
279
      {
280 281 282 283 284 285
        if (convert_constant_item(thd, field,&args[1]))
        {
          cmp.set_cmp_func(this, tmp_arg, tmp_arg+1,
                           INT_RESULT);		// Works for all types.
          return;
        }
unknown's avatar
unknown committed
286 287
      }
    }
288 289
    real_item= args[1]->real_item();
    if (real_item->type() == FIELD_ITEM /* && !real_item->const_item() */)
unknown's avatar
unknown committed
290
    {
291
      Field *field=((Item_field*) real_item)->field;
292
      if (field->can_be_compared_as_longlong())
unknown's avatar
unknown committed
293
      {
294 295 296 297 298 299
        if (convert_constant_item(thd, field,&args[0]))
        {
          cmp.set_cmp_func(this, tmp_arg, tmp_arg+1,
                           INT_RESULT); // Works for all types.
          return;
        }
unknown's avatar
unknown committed
300 301 302
      }
    }
  }
303
  set_cmp_func();
unknown's avatar
unknown committed
304 305
}

306

307
int Arg_comparator::set_compare_func(Item_bool_func2 *item, Item_result type)
unknown's avatar
unknown committed
308
{
309
  owner= item;
unknown's avatar
unknown committed
310 311
  func= comparator_matrix[type]
                         [test(owner->functype() == Item_func::EQUAL_FUNC)];
unknown's avatar
unknown committed
312
  switch (type) {
unknown's avatar
unknown committed
313
  case ROW_RESULT:
unknown's avatar
unknown committed
314
  {
315 316
    uint n= (*a)->cols();
    if (n != (*b)->cols())
317
    {
unknown's avatar
unknown committed
318
      my_error(ER_OPERAND_COLUMNS, MYF(0), n);
319 320 321
      comparators= 0;
      return 1;
    }
322
    if (!(comparators= new Arg_comparator[n]))
unknown's avatar
unknown committed
323 324 325 326
      return 1;
    for (uint i=0; i < n; i++)
    {
      if ((*a)->el(i)->cols() != (*b)->el(i)->cols())
unknown's avatar
unknown committed
327
      {
unknown's avatar
unknown committed
328
	my_error(ER_OPERAND_COLUMNS, MYF(0), (*a)->el(i)->cols());
unknown's avatar
unknown committed
329
	return 1;
unknown's avatar
unknown committed
330
      }
unknown's avatar
unknown committed
331 332
      comparators[i].set_cmp_func(owner, (*a)->addr(i), (*b)->addr(i));
    }
unknown's avatar
unknown committed
333
    break;
334
  }
unknown's avatar
unknown committed
335
  case STRING_RESULT:
336 337 338 339 340
  {
    /*
      We must set cmp_charset here as we may be called from for an automatic
      generated item, like in natural join
    */
341 342
    if (cmp_collation.set((*a)->collation, (*b)->collation) || 
	cmp_collation.derivation == DERIVATION_NONE)
343 344 345 346
    {
      my_coll_agg_error((*a)->collation, (*b)->collation, owner->func_name());
      return 1;
    }
347
    if (cmp_collation.collation == &my_charset_bin)
unknown's avatar
unknown committed
348 349
    {
      /*
350
	We are using BLOB/BINARY/VARBINARY, change to compare byte by byte,
unknown's avatar
unknown committed
351 352 353 354 355 356
	without removing end space
      */
      if (func == &Arg_comparator::compare_string)
	func= &Arg_comparator::compare_binary_string;
      else if (func == &Arg_comparator::compare_e_string)
	func= &Arg_comparator::compare_e_binary_string;
unknown's avatar
unknown committed
357 358

      /*
unknown's avatar
unknown committed
359
        As this is binary compassion, mark all fields that they can't be
unknown's avatar
unknown committed
360 361 362 363 364 365 366 367
        transformed. Otherwise we would get into trouble with comparisons
        like:
        WHERE col= 'j' AND col LIKE BINARY 'j'
        which would be transformed to:
        WHERE col= 'j'
      */
      (*a)->transform(&Item::set_no_const_sub, (byte*) 0);
      (*b)->transform(&Item::set_no_const_sub, (byte*) 0);
unknown's avatar
unknown committed
368
    }
unknown's avatar
unknown committed
369
    break;
370
  }
unknown's avatar
unknown committed
371
  case INT_RESULT:
372
  {
373
    if (func == &Arg_comparator::compare_int_signed)
374 375
    {
      if ((*a)->unsigned_flag)
unknown's avatar
unknown committed
376 377 378
        func= (((*b)->unsigned_flag)?
               &Arg_comparator::compare_int_unsigned :
               &Arg_comparator::compare_int_unsigned_signed);
379 380 381
      else if ((*b)->unsigned_flag)
        func= &Arg_comparator::compare_int_signed_unsigned;
    }
382 383 384 385 386
    else if (func== &Arg_comparator::compare_e_int)
    {
      if ((*a)->unsigned_flag ^ (*b)->unsigned_flag)
        func= &Arg_comparator::compare_e_int_diff_signedness;
    }
unknown's avatar
unknown committed
387 388 389 390 391 392 393
    break;
  }
  case DECIMAL_RESULT:
  case REAL_RESULT:
    break;
  default:
    DBUG_ASSERT(0);
394
  }
395
  return 0;
unknown's avatar
unknown committed
396
}
unknown's avatar
unknown committed
397

unknown's avatar
unknown committed
398

399
int Arg_comparator::compare_string()
unknown's avatar
unknown committed
400 401
{
  String *res1,*res2;
402
  if ((res1= (*a)->val_str(&owner->tmp_value1)))
unknown's avatar
unknown committed
403
  {
404
    if ((res2= (*b)->val_str(&owner->tmp_value2)))
unknown's avatar
unknown committed
405
    {
unknown's avatar
unknown committed
406
      owner->null_value= 0;
407
      return sortcmp(res1,res2,cmp_collation.collation);
unknown's avatar
unknown committed
408 409
    }
  }
unknown's avatar
unknown committed
410
  owner->null_value= 1;
unknown's avatar
unknown committed
411 412 413
  return -1;
}

unknown's avatar
unknown committed
414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446

/*
  Compare strings byte by byte. End spaces are also compared.

  RETURN
   < 0	*a < *b
   0	*b == *b
   > 0	*a > *b
*/

int Arg_comparator::compare_binary_string()
{
  String *res1,*res2;
  if ((res1= (*a)->val_str(&owner->tmp_value1)))
  {
    if ((res2= (*b)->val_str(&owner->tmp_value2)))
    {
      owner->null_value= 0;
      uint res1_length= res1->length();
      uint res2_length= res2->length();
      int cmp= memcmp(res1->ptr(), res2->ptr(), min(res1_length,res2_length));
      return cmp ? cmp : (int) (res1_length - res2_length);
    }
  }
  owner->null_value= 1;
  return -1;
}


/*
  Compare strings, but take into account that NULL == NULL
*/

unknown's avatar
unknown committed
447 448 449
int Arg_comparator::compare_e_string()
{
  String *res1,*res2;
450 451
  res1= (*a)->val_str(&owner->tmp_value1);
  res2= (*b)->val_str(&owner->tmp_value2);
unknown's avatar
unknown committed
452 453
  if (!res1 || !res2)
    return test(res1 == res2);
454
  return test(sortcmp(res1, res2, cmp_collation.collation) == 0);
unknown's avatar
unknown committed
455 456 457
}


unknown's avatar
unknown committed
458 459 460 461 462 463 464 465 466 467 468
int Arg_comparator::compare_e_binary_string()
{
  String *res1,*res2;
  res1= (*a)->val_str(&owner->tmp_value1);
  res2= (*b)->val_str(&owner->tmp_value2);
  if (!res1 || !res2)
    return test(res1 == res2);
  return test(stringcmp(res1, res2) == 0);
}


469
int Arg_comparator::compare_real()
unknown's avatar
unknown committed
470
{
471 472 473 474 475 476
  /*
    Fix yet another manifestation of Bug#2338. 'Volatile' will instruct
    gcc to flush double values out of 80-bit Intel FPU registers before
    performing the comparison.
  */
  volatile double val1, val2;
unknown's avatar
Merge  
unknown committed
477
  val1= (*a)->val_real();
478
  if (!(*a)->null_value)
unknown's avatar
unknown committed
479
  {
unknown's avatar
Merge  
unknown committed
480
    val2= (*b)->val_real();
481
    if (!(*b)->null_value)
unknown's avatar
unknown committed
482
    {
unknown's avatar
unknown committed
483
      owner->null_value= 0;
unknown's avatar
unknown committed
484 485 486 487 488
      if (val1 < val2)	return -1;
      if (val1 == val2) return 0;
      return 1;
    }
  }
unknown's avatar
unknown committed
489
  owner->null_value= 1;
unknown's avatar
unknown committed
490 491 492
  return -1;
}

unknown's avatar
unknown committed
493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510
int Arg_comparator::compare_decimal()
{
  my_decimal value1;
  my_decimal *val1= (*a)->val_decimal(&value1);
  if (!(*a)->null_value)
  {
    my_decimal value2;
    my_decimal *val2= (*b)->val_decimal(&value2);
    if (!(*b)->null_value)
    {
      owner->null_value= 0;
      return my_decimal_cmp(val1, val2);
    }
  }
  owner->null_value= 1;
  return -1;
}

unknown's avatar
unknown committed
511 512
int Arg_comparator::compare_e_real()
{
513 514
  double val1= (*a)->val_real();
  double val2= (*b)->val_real();
515 516
  if ((*a)->null_value || (*b)->null_value)
    return test((*a)->null_value && (*b)->null_value);
unknown's avatar
unknown committed
517 518
  return test(val1 == val2);
}
unknown's avatar
unknown committed
519

unknown's avatar
unknown committed
520 521 522 523 524 525 526 527 528 529
int Arg_comparator::compare_e_decimal()
{
  my_decimal value1, value2;
  my_decimal *val1= (*a)->val_decimal(&value1);
  my_decimal *val2= (*b)->val_decimal(&value2);
  if ((*a)->null_value || (*b)->null_value)
    return test((*a)->null_value && (*b)->null_value);
  return test(my_decimal_cmp(val1, val2) == 0);
}

530
int Arg_comparator::compare_int_signed()
unknown's avatar
unknown committed
531
{
532 533
  longlong val1= (*a)->val_int();
  if (!(*a)->null_value)
unknown's avatar
unknown committed
534
  {
535 536
    longlong val2= (*b)->val_int();
    if (!(*b)->null_value)
unknown's avatar
unknown committed
537
    {
unknown's avatar
unknown committed
538
      owner->null_value= 0;
unknown's avatar
unknown committed
539 540 541 542 543
      if (val1 < val2)	return -1;
      if (val1 == val2)   return 0;
      return 1;
    }
  }
unknown's avatar
unknown committed
544
  owner->null_value= 1;
unknown's avatar
unknown committed
545 546 547
  return -1;
}

548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623

/*
  Compare values as BIGINT UNSIGNED.
*/

int Arg_comparator::compare_int_unsigned()
{
  ulonglong val1= (*a)->val_int();
  if (!(*a)->null_value)
  {
    ulonglong val2= (*b)->val_int();
    if (!(*b)->null_value)
    {
      owner->null_value= 0;
      if (val1 < val2)	return -1;
      if (val1 == val2)   return 0;
      return 1;
    }
  }
  owner->null_value= 1;
  return -1;
}


/*
  Compare signed (*a) with unsigned (*B)
*/

int Arg_comparator::compare_int_signed_unsigned()
{
  longlong sval1= (*a)->val_int();
  if (!(*a)->null_value)
  {
    ulonglong uval2= (ulonglong)(*b)->val_int();
    if (!(*b)->null_value)
    {
      owner->null_value= 0;
      if (sval1 < 0 || (ulonglong)sval1 < uval2)
        return -1;
      if ((ulonglong)sval1 == uval2)
        return 0;
      return 1;
    }
  }
  owner->null_value= 1;
  return -1;
}


/*
  Compare unsigned (*a) with signed (*B)
*/

int Arg_comparator::compare_int_unsigned_signed()
{
  ulonglong uval1= (ulonglong)(*a)->val_int();
  if (!(*a)->null_value)
  {
    longlong sval2= (*b)->val_int();
    if (!(*b)->null_value)
    {
      owner->null_value= 0;
      if (sval2 < 0)
        return 1;
      if (uval1 < (ulonglong)sval2)
        return -1;
      if (uval1 == (ulonglong)sval2)
        return 0;
      return 1;
    }
  }
  owner->null_value= 1;
  return -1;
}


unknown's avatar
unknown committed
624 625
int Arg_comparator::compare_e_int()
{
626 627 628 629
  longlong val1= (*a)->val_int();
  longlong val2= (*b)->val_int();
  if ((*a)->null_value || (*b)->null_value)
    return test((*a)->null_value && (*b)->null_value);
unknown's avatar
unknown committed
630 631 632
  return test(val1 == val2);
}

633 634 635 636 637 638 639 640 641 642 643
/*
  Compare unsigned *a with signed *b or signed *a with unsigned *b.
*/
int Arg_comparator::compare_e_int_diff_signedness()
{
  longlong val1= (*a)->val_int();
  longlong val2= (*b)->val_int();
  if ((*a)->null_value || (*b)->null_value)
    return test((*a)->null_value && (*b)->null_value);
  return (val1 >= 0) && test(val1 == val2);
}
unknown's avatar
unknown committed
644

645
int Arg_comparator::compare_row()
unknown's avatar
unknown committed
646 647
{
  int res= 0;
648
  bool was_null= 0;
649 650
  (*a)->bring_value();
  (*b)->bring_value();
651
  uint n= (*a)->cols();
unknown's avatar
unknown committed
652
  for (uint i= 0; i<n; i++)
unknown's avatar
unknown committed
653
  {
654
    res= comparators[i].compare();
unknown's avatar
unknown committed
655
    if (owner->null_value)
656 657 658 659 660 661 662 663
    {
      // NULL was compared
      if (owner->abort_on_null)
        return -1; // We do not need correct NULL returning
      was_null= 1;
      owner->null_value= 0;
      res= 0;  // continue comparison (maybe we will meet explicit difference)
    }
664
    else if (res)
665
      return res;
unknown's avatar
unknown committed
666
  }
667 668 669 670 671 672 673 674 675 676
  if (was_null)
  {
    /*
      There was NULL(s) in comparison in some parts, but there was not
      explicit difference in other parts, so we have to return NULL
    */
    owner->null_value= 1;
    return -1;
  }
  return 0;
unknown's avatar
unknown committed
677
}
unknown's avatar
unknown committed
678

679

unknown's avatar
unknown committed
680 681
int Arg_comparator::compare_e_row()
{
682 683
  (*a)->bring_value();
  (*b)->bring_value();
684
  uint n= (*a)->cols();
unknown's avatar
unknown committed
685 686
  for (uint i= 0; i<n; i++)
  {
unknown's avatar
unknown committed
687
    if (!comparators[i].compare())
688
      return 0;
unknown's avatar
unknown committed
689 690 691 692
  }
  return 1;
}

693

694
bool Item_in_optimizer::fix_left(THD *thd, Item **ref)
unknown's avatar
unknown committed
695
{
696
  if (!args[0]->fixed && args[0]->fix_fields(thd, args) ||
unknown's avatar
unknown committed
697
      !cache && !(cache= Item_cache::get_cache(args[0]->result_type())))
698
    return 1;
699

700
  cache->setup(args[0]);
701
  if (cache->cols() == 1)
702
  {
unknown's avatar
unknown committed
703
    if ((used_tables_cache= args[0]->used_tables()))
unknown's avatar
unknown committed
704
      cache->set_used_tables(OUTER_REF_TABLE_BIT);
705 706 707
    else
      cache->set_used_tables(0);
  }
708 709 710 711
  else
  {
    uint n= cache->cols();
    for (uint i= 0; i < n; i++)
712 713
    {
      if (args[0]->el(i)->used_tables())
unknown's avatar
unknown committed
714
	((Item_cache *)cache->el(i))->set_used_tables(OUTER_REF_TABLE_BIT);
715 716 717
      else
	((Item_cache *)cache->el(i))->set_used_tables(0);
    }
unknown's avatar
unknown committed
718
    used_tables_cache= args[0]->used_tables();
719
  }
unknown's avatar
unknown committed
720 721 722
  not_null_tables_cache= args[0]->not_null_tables();
  with_sum_func= args[0]->with_sum_func;
  const_item_cache= args[0]->const_item();
723 724 725 726
  return 0;
}


727
bool Item_in_optimizer::fix_fields(THD *thd, Item **ref)
728
{
729
  DBUG_ASSERT(fixed == 0);
730
  if (fix_left(thd, ref))
unknown's avatar
unknown committed
731
    return TRUE;
732 733 734
  if (args[0]->maybe_null)
    maybe_null=1;

735
  if (!args[1]->fixed && args[1]->fix_fields(thd, args+1))
unknown's avatar
unknown committed
736
    return TRUE;
unknown's avatar
unknown committed
737 738 739
  Item_in_subselect * sub= (Item_in_subselect *)args[1];
  if (args[0]->cols() != sub->engine->cols())
  {
unknown's avatar
unknown committed
740
    my_error(ER_OPERAND_COLUMNS, MYF(0), args[0]->cols());
unknown's avatar
unknown committed
741
    return TRUE;
unknown's avatar
unknown committed
742
  }
743 744 745 746
  if (args[1]->maybe_null)
    maybe_null=1;
  with_sum_func= with_sum_func || args[1]->with_sum_func;
  used_tables_cache|= args[1]->used_tables();
unknown's avatar
unknown committed
747
  not_null_tables_cache|= args[1]->not_null_tables();
748
  const_item_cache&= args[1]->const_item();
749
  fixed= 1;
unknown's avatar
unknown committed
750
  return FALSE;
751 752
}

753

754 755
longlong Item_in_optimizer::val_int()
{
756
  DBUG_ASSERT(fixed == 1);
757 758
  cache->store(args[0]);
  if (cache->null_value)
759
  {
760
    null_value= 1;
761 762
    return 0;
  }
unknown's avatar
unknown committed
763
  bool tmp= args[1]->val_bool_result();
unknown's avatar
unknown committed
764
  null_value= args[1]->null_value;
765 766 767
  return tmp;
}

768 769 770 771 772 773 774 775

void Item_in_optimizer::keep_top_level_cache()
{
  cache->keep_array();
  save_cache= 1;
}


unknown's avatar
unknown committed
776 777 778 779
void Item_in_optimizer::cleanup()
{
  DBUG_ENTER("Item_in_optimizer::cleanup");
  Item_bool_func::cleanup();
780 781
  if (!save_cache)
    cache= 0;
unknown's avatar
unknown committed
782 783 784
  DBUG_VOID_RETURN;
}

785

786
bool Item_in_optimizer::is_null()
787
{
788 789
  cache->store(args[0]);
  return (null_value= (cache->null_value || args[1]->is_null()));
790
}
unknown's avatar
unknown committed
791

792

unknown's avatar
unknown committed
793 794
longlong Item_func_eq::val_int()
{
795
  DBUG_ASSERT(fixed == 1);
796
  int value= cmp.compare();
unknown's avatar
unknown committed
797 798 799
  return value == 0 ? 1 : 0;
}

800

unknown's avatar
unknown committed
801 802
/* Same as Item_func_eq, but NULL = NULL */

unknown's avatar
unknown committed
803 804 805 806 807 808
void Item_func_equal::fix_length_and_dec()
{
  Item_bool_func2::fix_length_and_dec();
  maybe_null=null_value=0;
}

unknown's avatar
unknown committed
809 810
longlong Item_func_equal::val_int()
{
811
  DBUG_ASSERT(fixed == 1);
812
  return cmp.compare();
unknown's avatar
unknown committed
813 814 815 816
}

longlong Item_func_ne::val_int()
{
817
  DBUG_ASSERT(fixed == 1);
818
  int value= cmp.compare();
819
  return value != 0 && !null_value ? 1 : 0;
unknown's avatar
unknown committed
820 821 822 823 824
}


longlong Item_func_ge::val_int()
{
825
  DBUG_ASSERT(fixed == 1);
826
  int value= cmp.compare();
unknown's avatar
unknown committed
827 828 829 830 831 832
  return value >= 0 ? 1 : 0;
}


longlong Item_func_gt::val_int()
{
833
  DBUG_ASSERT(fixed == 1);
834
  int value= cmp.compare();
unknown's avatar
unknown committed
835 836 837 838 839
  return value > 0 ? 1 : 0;
}

longlong Item_func_le::val_int()
{
840
  DBUG_ASSERT(fixed == 1);
841
  int value= cmp.compare();
unknown's avatar
unknown committed
842 843 844 845 846 847
  return value <= 0 && !null_value ? 1 : 0;
}


longlong Item_func_lt::val_int()
{
848
  DBUG_ASSERT(fixed == 1);
849
  int value= cmp.compare();
unknown's avatar
unknown committed
850 851 852 853 854 855
  return value < 0 && !null_value ? 1 : 0;
}


longlong Item_func_strcmp::val_int()
{
856
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
857 858 859 860 861 862 863
  String *a=args[0]->val_str(&tmp_value1);
  String *b=args[1]->val_str(&tmp_value2);
  if (!a || !b)
  {
    null_value=1;
    return 0;
  }
864
  int value= sortcmp(a,b,cmp.cmp_collation.collation);
unknown's avatar
unknown committed
865 866 867 868 869 870 871
  null_value=0;
  return !value ? 0 : (value < 0 ? (longlong) -1 : (longlong) 1);
}


void Item_func_interval::fix_length_and_dec()
{
unknown's avatar
unknown committed
872 873
  use_decimal_comparison= (row->el(0)->result_type() == DECIMAL_RESULT) ||
    (row->el(0)->result_type() == INT_RESULT);
874
  if (row->cols() > 8)
unknown's avatar
unknown committed
875
  {
876 877 878
    bool consts=1;

    for (uint i=1 ; consts && i < row->cols() ; i++)
unknown's avatar
unknown committed
879
    {
880
      consts&= row->el(i)->const_item();
unknown's avatar
unknown committed
881
    }
882 883

    if (consts &&
unknown's avatar
unknown committed
884 885
        (intervals=
          (interval_range*) sql_alloc(sizeof(interval_range)*(row->cols()-1))))
unknown's avatar
unknown committed
886
    {
unknown's avatar
unknown committed
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
      if (use_decimal_comparison)
      {
        for (uint i=1 ; i < row->cols(); i++)
        {
          Item *el= row->el(i);
          interval_range *range= intervals + (i-1);
          if ((el->result_type() == DECIMAL_RESULT) ||
              (el->result_type() == INT_RESULT))
          {
            range->type= DECIMAL_RESULT;
            range->dec.init();
            my_decimal *dec= el->val_decimal(&range->dec);
            if (dec != &range->dec)
            {
              range->dec= *dec;
              range->dec.fix_buffer_pointer();
            }
          }
          else
          {
            range->type= REAL_RESULT;
            range->dbl= el->val_real();
          }
        }
      }
      else
      {
        for (uint i=1 ; i < row->cols(); i++)
        {
          intervals[i-1].dbl= row->el(i)->val_real();
        }
      }
unknown's avatar
unknown committed
919 920
    }
  }
unknown's avatar
unknown committed
921 922
  maybe_null= 0;
  max_length= 2;
923
  used_tables_cache|= row->used_tables();
unknown's avatar
unknown committed
924
  not_null_tables_cache= row->not_null_tables();
925
  with_sum_func= with_sum_func || row->with_sum_func;
unknown's avatar
unknown committed
926
  const_item_cache&= row->const_item();
unknown's avatar
unknown committed
927 928
}

unknown's avatar
unknown committed
929

unknown's avatar
unknown committed
930
/*
unknown's avatar
unknown committed
931 932 933 934 935 936 937 938 939 940 941 942 943 944
  Execute Item_func_interval()

  SYNOPSIS
    Item_func_interval::val_int()

  NOTES
    If we are doing a decimal comparison, we are
    evaluating the first item twice.

  RETURN
    -1 if null value,
    0 if lower than lowest
    1 - arg_count-1 if between args[n] and args[n+1]
    arg_count if higher than biggest argument
unknown's avatar
unknown committed
945 946 947 948
*/

longlong Item_func_interval::val_int()
{
949
  DBUG_ASSERT(fixed == 1);
950
  double value;
unknown's avatar
unknown committed
951
  my_decimal dec_buf, *dec= NULL;
unknown's avatar
unknown committed
952 953
  uint i;

unknown's avatar
unknown committed
954 955 956
  if (use_decimal_comparison)
  {
    dec= row->el(0)->val_decimal(&dec_buf);
957 958 959 960 961 962 963 964 965
    if (row->el(0)->null_value)
      return -1;
    my_decimal2double(E_DEC_FATAL_ERROR, dec, &value);
  }
  else
  {
    value= row->el(0)->val_real();
    if (row->el(0)->null_value)
      return -1;
unknown's avatar
unknown committed
966
  }
unknown's avatar
unknown committed
967

unknown's avatar
unknown committed
968 969 970
  if (intervals)
  {					// Use binary search to find interval
    uint start,end;
971
    start= 0;
unknown's avatar
unknown committed
972
    end=   row->cols()-2;
unknown's avatar
unknown committed
973 974
    while (start != end)
    {
unknown's avatar
unknown committed
975
      uint mid= (start + end + 1) / 2;
unknown's avatar
unknown committed
976 977
      interval_range *range= intervals + mid;
      my_bool cmp_result;
unknown's avatar
unknown committed
978 979 980 981 982
      /*
        The values in the range intervall may have different types,
        Only do a decimal comparision of the first argument is a decimal
        and we are comparing against a decimal
      */
unknown's avatar
unknown committed
983 984 985 986 987
      if (dec && range->type == DECIMAL_RESULT)
        cmp_result= my_decimal_cmp(&range->dec, dec) <= 0;
      else
        cmp_result= (range->dbl <= value);
      if (cmp_result)
unknown's avatar
unknown committed
988
	start= mid;
unknown's avatar
unknown committed
989
      else
unknown's avatar
unknown committed
990
	end= mid - 1;
unknown's avatar
unknown committed
991
    }
unknown's avatar
unknown committed
992 993
    interval_range *range= intervals+start;
    return ((dec && range->type == DECIMAL_RESULT) ?
unknown's avatar
unknown committed
994
            my_decimal_cmp(dec, &range->dec) < 0 :
unknown's avatar
unknown committed
995
            value < range->dbl) ? 0 : start + 1;
unknown's avatar
unknown committed
996
  }
997 998

  for (i=1 ; i < row->cols() ; i++)
unknown's avatar
unknown committed
999
  {
unknown's avatar
unknown committed
1000 1001 1002 1003 1004 1005 1006 1007 1008
    Item *el= row->el(i);
    if (use_decimal_comparison &&
        ((el->result_type() == DECIMAL_RESULT) ||
         (el->result_type() == INT_RESULT)))
    {
      my_decimal e_dec_buf, *e_dec= row->el(i)->val_decimal(&e_dec_buf);
      if (my_decimal_cmp(e_dec, dec) > 0)
        return i-1;
    }
unknown's avatar
unknown committed
1009 1010
    else if (row->el(i)->val_real() > value)
      return i-1;
unknown's avatar
unknown committed
1011
  }
1012
  return i-1;
unknown's avatar
unknown committed
1013 1014
}

unknown's avatar
unknown committed
1015

unknown's avatar
unknown committed
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
/*
  Perform context analysis of a BETWEEN item tree

  SYNOPSIS:
    fix_fields()
    thd     reference to the global context of the query thread
    tables  list of all open tables involved in the query
    ref     pointer to Item* variable where pointer to resulting "fixed"
            item is to be assigned

  DESCRIPTION
    This function performs context analysis (name resolution) and calculates
    various attributes of the item tree with Item_func_between as its root.
    The function saves in ref the pointer to the item or to a newly created
    item that is considered as a replacement for the original one.

  NOTES
    Let T0(e)/T1(e) be the value of not_null_tables(e) when e is used on
    a predicate/function level. Then it's easy to show that:
      T0(e BETWEEN e1 AND e2)     = union(T1(e),T1(e1),T1(e2))
      T1(e BETWEEN e1 AND e2)     = union(T1(e),intersection(T1(e1),T1(e2)))
      T0(e NOT BETWEEN e1 AND e2) = union(T1(e),intersection(T1(e1),T1(e2)))
      T1(e NOT BETWEEN e1 AND e2) = union(T1(e),intersection(T1(e1),T1(e2)))

  RETURN
    0   ok
    1   got error
*/

unknown's avatar
unknown committed
1045
bool Item_func_between::fix_fields(THD *thd, Item **ref)
unknown's avatar
unknown committed
1046
{
1047
  if (Item_func_opt_neg::fix_fields(thd, ref))
unknown's avatar
unknown committed
1048 1049 1050 1051 1052 1053 1054
    return 1;

  /* not_null_tables_cache == union(T1(e),T1(e1),T1(e2)) */
  if (pred_level && !negated)
    return 0;

  /* not_null_tables_cache == union(T1(e), intersection(T1(e1),T1(e2))) */
unknown's avatar
unknown committed
1055 1056 1057
  not_null_tables_cache= (args[0]->not_null_tables() |
                          (args[1]->not_null_tables() &
                           args[2]->not_null_tables()));
unknown's avatar
unknown committed
1058 1059 1060 1061 1062

  return 0;
}


unknown's avatar
unknown committed
1063 1064
void Item_func_between::fix_length_and_dec()
{
unknown's avatar
unknown committed
1065
   max_length= 1;
1066
   THD *thd= current_thd;
unknown's avatar
unknown committed
1067

1068 1069
  /*
    As some compare functions are generated after sql_yacc,
unknown's avatar
unknown committed
1070
    we have to check for out of memory conditions here
1071
  */
unknown's avatar
unknown committed
1072 1073
  if (!args[0] || !args[1] || !args[2])
    return;
1074 1075
  agg_cmp_type(thd, &cmp_type, args, 3);

unknown's avatar
unknown committed
1076
  if (cmp_type == STRING_RESULT &&
unknown's avatar
unknown committed
1077
      agg_arg_charsets(cmp_collation, args, 3, MY_COLL_CMP_CONV))
unknown's avatar
unknown committed
1078
    return;
unknown's avatar
unknown committed
1079 1080 1081 1082 1083
}


longlong Item_func_between::val_int()
{						// ANSI BETWEEN
1084
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1085 1086 1087 1088 1089 1090 1091 1092 1093
  if (cmp_type == STRING_RESULT)
  {
    String *value,*a,*b;
    value=args[0]->val_str(&value0);
    if ((null_value=args[0]->null_value))
      return 0;
    a=args[1]->val_str(&value1);
    b=args[2]->val_str(&value2);
    if (!args[1]->null_value && !args[2]->null_value)
unknown's avatar
unknown committed
1094 1095 1096
      return (longlong) ((sortcmp(value,a,cmp_collation.collation) >= 0 &&
                          sortcmp(value,b,cmp_collation.collation) <= 0) !=
                         negated);
unknown's avatar
unknown committed
1097 1098 1099 1100
    if (args[1]->null_value && args[2]->null_value)
      null_value=1;
    else if (args[1]->null_value)
    {
unknown's avatar
unknown committed
1101 1102
      // Set to not null if false range.
      null_value= sortcmp(value,b,cmp_collation.collation) <= 0;
unknown's avatar
unknown committed
1103 1104 1105
    }
    else
    {
unknown's avatar
unknown committed
1106 1107
      // Set to not null if false range.
      null_value= sortcmp(value,a,cmp_collation.collation) >= 0;
unknown's avatar
unknown committed
1108 1109 1110 1111
    }
  }
  else if (cmp_type == INT_RESULT)
  {
1112
    longlong value=args[0]->val_int(), a, b;
unknown's avatar
unknown committed
1113
    if ((null_value=args[0]->null_value))
1114
      return 0;					/* purecov: inspected */
unknown's avatar
unknown committed
1115 1116 1117
    a=args[1]->val_int();
    b=args[2]->val_int();
    if (!args[1]->null_value && !args[2]->null_value)
unknown's avatar
unknown committed
1118
      return (longlong) ((value >= a && value <= b) != negated);
unknown's avatar
unknown committed
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
    if (args[1]->null_value && args[2]->null_value)
      null_value=1;
    else if (args[1]->null_value)
    {
      null_value= value <= b;			// not null if false range.
    }
    else
    {
      null_value= value >= a;
    }
  }
unknown's avatar
unknown committed
1130 1131 1132 1133 1134 1135 1136 1137 1138
  else if (cmp_type == DECIMAL_RESULT)
  {
    my_decimal dec_buf, *dec= args[0]->val_decimal(&dec_buf),
               a_buf, *a_dec, b_buf, *b_dec;
    if ((null_value=args[0]->null_value))
      return 0;					/* purecov: inspected */
    a_dec= args[1]->val_decimal(&a_buf);
    b_dec= args[2]->val_decimal(&b_buf);
    if (!args[1]->null_value && !args[2]->null_value)
1139 1140
      return (longlong) ((my_decimal_cmp(dec, a_dec) >= 0 &&
                          my_decimal_cmp(dec, b_dec) <= 0) != negated);
unknown's avatar
unknown committed
1141 1142 1143 1144 1145 1146 1147
    if (args[1]->null_value && args[2]->null_value)
      null_value=1;
    else if (args[1]->null_value)
      null_value= (my_decimal_cmp(dec, b_dec) <= 0);
    else
      null_value= (my_decimal_cmp(dec, a_dec) >= 0);
  }
unknown's avatar
unknown committed
1148 1149
  else
  {
1150
    double value= args[0]->val_real(),a,b;
unknown's avatar
unknown committed
1151
    if ((null_value=args[0]->null_value))
1152
      return 0;					/* purecov: inspected */
1153 1154
    a= args[1]->val_real();
    b= args[2]->val_real();
unknown's avatar
unknown committed
1155
    if (!args[1]->null_value && !args[2]->null_value)
unknown's avatar
unknown committed
1156
      return (longlong) ((value >= a && value <= b) != negated);
unknown's avatar
unknown committed
1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
    if (args[1]->null_value && args[2]->null_value)
      null_value=1;
    else if (args[1]->null_value)
    {
      null_value= value <= b;			// not null if false range.
    }
    else
    {
      null_value= value >= a;
    }
  }
unknown's avatar
unknown committed
1168
  return (longlong) (!null_value && negated);
unknown's avatar
unknown committed
1169 1170
}

1171 1172 1173 1174 1175

void Item_func_between::print(String *str)
{
  str->append('(');
  args[0]->print(str);
unknown's avatar
unknown committed
1176
  if (negated)
1177 1178
    str->append(STRING_WITH_LEN(" not"));
  str->append(STRING_WITH_LEN(" between "));
1179
  args[1]->print(str);
1180
  str->append(STRING_WITH_LEN(" and "));
1181 1182 1183 1184
  args[2]->print(str);
  str->append(')');
}

unknown's avatar
unknown committed
1185 1186 1187
void
Item_func_ifnull::fix_length_and_dec()
{
1188
  agg_result_type(&hybrid_type, args, 2);
unknown's avatar
unknown committed
1189
  maybe_null=args[1]->maybe_null;
unknown's avatar
unknown committed
1190
  decimals= max(args[0]->decimals, args[1]->decimals);
1191 1192 1193 1194 1195
  max_length= (hybrid_type == DECIMAL_RESULT || hybrid_type == INT_RESULT) ?
    (max(args[0]->max_length - args[0]->decimals,
         args[1]->max_length - args[1]->decimals) + decimals) :
    max(args[0]->max_length, args[1]->max_length);

unknown's avatar
unknown committed
1196
  switch (hybrid_type) {
unknown's avatar
unknown committed
1197
  case STRING_RESULT:
unknown's avatar
unknown committed
1198
    agg_arg_charsets(collation, args, arg_count, MY_COLL_CMP_CONV);
unknown's avatar
unknown committed
1199 1200 1201 1202 1203
    break;
  case DECIMAL_RESULT:
  case REAL_RESULT:
    break;
  case INT_RESULT:
1204
    decimals= 0;
unknown's avatar
unknown committed
1205 1206 1207 1208 1209
    break;
  case ROW_RESULT:
  default:
    DBUG_ASSERT(0);
  }
1210 1211 1212
  cached_field_type= args[0]->field_type();
  if (cached_field_type != args[1]->field_type())
    cached_field_type= Item_func::field_type();
unknown's avatar
unknown committed
1213 1214
}

unknown's avatar
unknown committed
1215 1216 1217 1218 1219 1220 1221 1222

uint Item_func_ifnull::decimal_precision() const
{
  int max_int_part=max(args[0]->decimal_int_part(),args[1]->decimal_int_part());
  return min(max_int_part + decimals, DECIMAL_MAX_PRECISION);
}


1223 1224 1225
enum_field_types Item_func_ifnull::field_type() const 
{
  return cached_field_type;
unknown's avatar
unknown committed
1226 1227
}

1228 1229 1230 1231
Field *Item_func_ifnull::tmp_table_field(TABLE *table)
{
  return tmp_table_field_from_field_type(table);
}
1232

unknown's avatar
unknown committed
1233
double
unknown's avatar
unknown committed
1234
Item_func_ifnull::real_op()
unknown's avatar
unknown committed
1235
{
1236
  DBUG_ASSERT(fixed == 1);
1237
  double value= args[0]->val_real();
unknown's avatar
unknown committed
1238 1239 1240 1241 1242
  if (!args[0]->null_value)
  {
    null_value=0;
    return value;
  }
1243
  value= args[1]->val_real();
unknown's avatar
unknown committed
1244 1245 1246 1247 1248 1249
  if ((null_value=args[1]->null_value))
    return 0.0;
  return value;
}

longlong
unknown's avatar
unknown committed
1250
Item_func_ifnull::int_op()
unknown's avatar
unknown committed
1251
{
1252
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
  longlong value=args[0]->val_int();
  if (!args[0]->null_value)
  {
    null_value=0;
    return value;
  }
  value=args[1]->val_int();
  if ((null_value=args[1]->null_value))
    return 0;
  return value;
}

unknown's avatar
unknown committed
1265

unknown's avatar
unknown committed
1266
my_decimal *Item_func_ifnull::decimal_op(my_decimal *decimal_value)
unknown's avatar
unknown committed
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
{
  DBUG_ASSERT(fixed == 1);
  my_decimal *value= args[0]->val_decimal(decimal_value);
  if (!args[0]->null_value)
  {
    null_value= 0;
    return value;
  }
  value= args[1]->val_decimal(decimal_value);
  if ((null_value= args[1]->null_value))
    return 0;
  return value;
}


unknown's avatar
unknown committed
1282
String *
unknown's avatar
unknown committed
1283
Item_func_ifnull::str_op(String *str)
unknown's avatar
unknown committed
1284
{
1285
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1286 1287 1288 1289
  String *res  =args[0]->val_str(str);
  if (!args[0]->null_value)
  {
    null_value=0;
1290
    res->set_charset(collation.collation);
unknown's avatar
unknown committed
1291 1292 1293 1294 1295
    return res;
  }
  res=args[1]->val_str(str);
  if ((null_value=args[1]->null_value))
    return 0;
1296
  res->set_charset(collation.collation);
unknown's avatar
unknown committed
1297 1298 1299
  return res;
}

1300

unknown's avatar
unknown committed
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
/*
  Perform context analysis of an IF item tree

  SYNOPSIS:
    fix_fields()
    thd     reference to the global context of the query thread
    tables  list of all open tables involved in the query
    ref     pointer to Item* variable where pointer to resulting "fixed"
            item is to be assigned

  DESCRIPTION
    This function performs context analysis (name resolution) and calculates
    various attributes of the item tree with Item_func_if as its root.
    The function saves in ref the pointer to the item or to a newly created
    item that is considered as a replacement for the original one.

  NOTES
    Let T0(e)/T1(e) be the value of not_null_tables(e) when e is used on
    a predicate/function level. Then it's easy to show that:
      T0(IF(e,e1,e2)  = T1(IF(e,e1,e2))
      T1(IF(e,e1,e2)) = intersection(T1(e1),T1(e2))

  RETURN
    0   ok
    1   got error
*/

bool
1329
Item_func_if::fix_fields(THD *thd, Item **ref)
unknown's avatar
unknown committed
1330 1331 1332 1333
{
  DBUG_ASSERT(fixed == 0);
  args[0]->top_level_item();

1334
  if (Item_func::fix_fields(thd, ref))
unknown's avatar
unknown committed
1335 1336
    return 1;

unknown's avatar
unknown committed
1337 1338
  not_null_tables_cache= (args[1]->not_null_tables() &
                          args[2]->not_null_tables());
unknown's avatar
unknown committed
1339 1340 1341 1342 1343

  return 0;
}


unknown's avatar
unknown committed
1344 1345 1346 1347
void
Item_func_if::fix_length_and_dec()
{
  maybe_null=args[1]->maybe_null || args[2]->maybe_null;
unknown's avatar
unknown committed
1348
  decimals= max(args[1]->decimals, args[2]->decimals);
1349

unknown's avatar
unknown committed
1350 1351
  enum Item_result arg1_type=args[1]->result_type();
  enum Item_result arg2_type=args[2]->result_type();
unknown's avatar
unknown committed
1352 1353
  bool null1=args[1]->const_item() && args[1]->null_value;
  bool null2=args[2]->const_item() && args[2]->null_value;
1354 1355 1356 1357

  if (null1)
  {
    cached_result_type= arg2_type;
1358
    collation.set(args[2]->collation.collation);
1359 1360 1361
  }
  else if (null2)
  {
unknown's avatar
unknown committed
1362
    cached_result_type= arg1_type;
1363
    collation.set(args[1]->collation.collation);
1364
  }
unknown's avatar
unknown committed
1365
  else
1366
  {
1367 1368 1369
    agg_result_type(&cached_result_type, args+1, 2);
    if (cached_result_type == STRING_RESULT)
    {
unknown's avatar
unknown committed
1370
      if (agg_arg_charsets(collation, args+1, 2, MY_COLL_ALLOW_CONV))
1371
        return;
1372
    }
1373
    else
1374
    {
1375
      collation.set(&my_charset_bin);	// Number
1376
    }
1377
  }
1378 1379 1380
  max_length=
    (cached_result_type == DECIMAL_RESULT || cached_result_type == INT_RESULT) ?
    (max(args[1]->max_length - args[1]->decimals,
1381 1382
         args[2]->max_length - args[2]->decimals) + decimals +
         (unsigned_flag ? 0 : 1) ) :
1383
    max(args[1]->max_length, args[2]->max_length);
unknown's avatar
unknown committed
1384 1385 1386
}


unknown's avatar
unknown committed
1387 1388 1389 1390 1391 1392 1393 1394
uint Item_func_if::decimal_precision() const
{
  int precision=(max(args[1]->decimal_int_part(),args[2]->decimal_int_part())+
                 decimals);
  return min(precision, DECIMAL_MAX_PRECISION);
}


unknown's avatar
unknown committed
1395
double
1396
Item_func_if::val_real()
unknown's avatar
unknown committed
1397
{
1398
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1399
  Item *arg= args[0]->val_bool() ? args[1] : args[2];
1400
  double value= arg->val_real();
unknown's avatar
unknown committed
1401 1402 1403 1404 1405 1406 1407
  null_value=arg->null_value;
  return value;
}

longlong
Item_func_if::val_int()
{
1408
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1409
  Item *arg= args[0]->val_bool() ? args[1] : args[2];
unknown's avatar
unknown committed
1410 1411 1412 1413 1414 1415 1416 1417
  longlong value=arg->val_int();
  null_value=arg->null_value;
  return value;
}

String *
Item_func_if::val_str(String *str)
{
1418
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1419
  Item *arg= args[0]->val_bool() ? args[1] : args[2];
unknown's avatar
unknown committed
1420
  String *res=arg->val_str(str);
1421
  if (res)
1422
    res->set_charset(collation.collation);
unknown's avatar
unknown committed
1423 1424 1425 1426 1427
  null_value=arg->null_value;
  return res;
}


unknown's avatar
unknown committed
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438
my_decimal *
Item_func_if::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed == 1);
  Item *arg= args[0]->val_bool() ? args[1] : args[2];
  my_decimal *value= arg->val_decimal(decimal_value);
  null_value= arg->null_value;
  return value;
}


unknown's avatar
unknown committed
1439 1440 1441 1442 1443 1444 1445 1446 1447
void
Item_func_nullif::fix_length_and_dec()
{
  Item_bool_func2::fix_length_and_dec();
  maybe_null=1;
  if (args[0])					// Only false if EOM
  {
    max_length=args[0]->max_length;
    decimals=args[0]->decimals;
unknown's avatar
unknown committed
1448 1449
    unsigned_flag= args[0]->unsigned_flag;
    cached_result_type= args[0]->result_type();
1450 1451 1452
    if (cached_result_type == STRING_RESULT &&
        agg_arg_charsets(collation, args, arg_count, MY_COLL_CMP_CONV))
      return;
unknown's avatar
unknown committed
1453 1454 1455
  }
}

unknown's avatar
unknown committed
1456

unknown's avatar
unknown committed
1457
/*
1458
  nullif () returns NULL if arguments are equal, else it returns the
unknown's avatar
unknown committed
1459 1460 1461 1462 1463 1464
  first argument.
  Note that we have to evaluate the first argument twice as the compare
  may have been done with a different type than return value
*/

double
1465
Item_func_nullif::val_real()
unknown's avatar
unknown committed
1466
{
1467
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1468
  double value;
unknown's avatar
unknown committed
1469
  if (!cmp.compare())
unknown's avatar
unknown committed
1470 1471 1472 1473
  {
    null_value=1;
    return 0.0;
  }
1474
  value= args[0]->val_real();
unknown's avatar
unknown committed
1475 1476 1477 1478 1479 1480 1481
  null_value=args[0]->null_value;
  return value;
}

longlong
Item_func_nullif::val_int()
{
1482
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1483
  longlong value;
unknown's avatar
unknown committed
1484
  if (!cmp.compare())
unknown's avatar
unknown committed
1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496
  {
    null_value=1;
    return 0;
  }
  value=args[0]->val_int();
  null_value=args[0]->null_value;
  return value;
}

String *
Item_func_nullif::val_str(String *str)
{
1497
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1498
  String *res;
unknown's avatar
unknown committed
1499
  if (!cmp.compare())
unknown's avatar
unknown committed
1500 1501 1502 1503 1504 1505 1506 1507 1508
  {
    null_value=1;
    return 0;
  }
  res=args[0]->val_str(str);
  null_value=args[0]->null_value;
  return res;
}

1509

unknown's avatar
unknown committed
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
my_decimal *
Item_func_nullif::val_decimal(my_decimal * decimal_value)
{
  DBUG_ASSERT(fixed == 1);
  my_decimal *res;
  if (!cmp.compare())
  {
    null_value=1;
    return 0;
  }
  res= args[0]->val_decimal(decimal_value);
  null_value= args[0]->null_value;
  return res;
}


1526 1527 1528
bool
Item_func_nullif::is_null()
{
unknown's avatar
unknown committed
1529
  return (null_value= (!cmp.compare() ? 1 : args[0]->null_value)); 
1530 1531
}

unknown's avatar
unknown committed
1532
/*
1533 1534
  CASE expression 
  Return the matching ITEM or NULL if all compares (including else) failed
unknown's avatar
unknown committed
1535 1536 1537 1538
*/

Item *Item_func_case::find_item(String *str)
{
unknown's avatar
unknown committed
1539 1540
  String *first_expr_str, *tmp;
  my_decimal *first_expr_dec, first_expr_dec_val;
unknown's avatar
unknown committed
1541 1542
  longlong first_expr_int;
  double   first_expr_real;
1543 1544
  char buff[MAX_FIELD_WIDTH];
  String buff_str(buff,sizeof(buff),default_charset());
unknown's avatar
unknown committed
1545

unknown's avatar
unknown committed
1546 1547 1548 1549
  /* These will be initialized later */
  LINT_INIT(first_expr_str);
  LINT_INIT(first_expr_int);
  LINT_INIT(first_expr_real);
unknown's avatar
unknown committed
1550
  LINT_INIT(first_expr_dec);
unknown's avatar
unknown committed
1551

unknown's avatar
unknown committed
1552 1553 1554 1555 1556 1557
  if (first_expr_num != -1)
  {
    switch (cmp_type)
    {
      case STRING_RESULT:
      	// We can't use 'str' here as this may be overwritten
1558
	if (!(first_expr_str= args[first_expr_num]->val_str(&buff_str)))
unknown's avatar
unknown committed
1559 1560 1561 1562 1563 1564 1565 1566
	  return else_expr_num != -1 ? args[else_expr_num] : 0;	// Impossible
        break;
      case INT_RESULT:
	first_expr_int= args[first_expr_num]->val_int();
	if (args[first_expr_num]->null_value)
	  return else_expr_num != -1 ? args[else_expr_num] : 0;
	break;
      case REAL_RESULT:
1567
	first_expr_real= args[first_expr_num]->val_real();
unknown's avatar
unknown committed
1568 1569 1570
	if (args[first_expr_num]->null_value)
	  return else_expr_num != -1 ? args[else_expr_num] : 0;
	break;
unknown's avatar
unknown committed
1571 1572 1573 1574 1575
      case DECIMAL_RESULT:
        first_expr_dec= args[first_expr_num]->val_decimal(&first_expr_dec_val);
        if (args[first_expr_num]->null_value)
          return else_expr_num != -1 ? args[else_expr_num] : 0;
        break;
unknown's avatar
unknown committed
1576 1577
      case ROW_RESULT:
      default:
unknown's avatar
unknown committed
1578
        // This case should never be chosen
unknown's avatar
unknown committed
1579 1580 1581 1582 1583
	DBUG_ASSERT(0);
	break;
    }
  }

unknown's avatar
unknown committed
1584
  // Compare every WHEN argument with it and return the first match
1585
  for (uint i=0 ; i < ncases ; i+=2)
unknown's avatar
unknown committed
1586
  {
1587
    if (first_expr_num == -1)
unknown's avatar
unknown committed
1588
    {
unknown's avatar
unknown committed
1589
      // No expression between CASE and the first WHEN
unknown's avatar
unknown committed
1590
      if (args[i]->val_bool())
unknown's avatar
unknown committed
1591 1592 1593
	return args[i+1];
      continue;
    }
unknown's avatar
unknown committed
1594
    switch (cmp_type) {
unknown's avatar
unknown committed
1595 1596
    case STRING_RESULT:
      if ((tmp=args[i]->val_str(str)))		// If not null
unknown's avatar
unknown committed
1597
	if (sortcmp(tmp,first_expr_str,cmp_collation.collation)==0)
unknown's avatar
unknown committed
1598 1599 1600 1601 1602 1603 1604
	  return args[i+1];
      break;
    case INT_RESULT:
      if (args[i]->val_int()==first_expr_int && !args[i]->null_value) 
        return args[i+1];
      break;
    case REAL_RESULT: 
1605
      if (args[i]->val_real() == first_expr_real && !args[i]->null_value)
unknown's avatar
unknown committed
1606
        return args[i+1];
unknown's avatar
unknown committed
1607
      break;
unknown's avatar
unknown committed
1608 1609 1610 1611 1612 1613 1614
    case DECIMAL_RESULT:
    {
      my_decimal value;
      if (my_decimal_cmp(args[i]->val_decimal(&value), first_expr_dec) == 0)
        return args[i+1];
      break;
    }
1615
    case ROW_RESULT:
unknown's avatar
unknown committed
1616
    default:
unknown's avatar
unknown committed
1617
      // This case should never be chosen
unknown's avatar
unknown committed
1618 1619
      DBUG_ASSERT(0);
      break;
unknown's avatar
unknown committed
1620 1621 1622
    }
  }
  // No, WHEN clauses all missed, return ELSE expression
1623
  return else_expr_num != -1 ? args[else_expr_num] : 0;
unknown's avatar
unknown committed
1624 1625 1626 1627 1628
}


String *Item_func_case::val_str(String *str)
{
1629
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1630 1631 1632 1633 1634 1635 1636 1637
  String *res;
  Item *item=find_item(str);

  if (!item)
  {
    null_value=1;
    return 0;
  }
unknown's avatar
unknown committed
1638
  null_value= 0;
unknown's avatar
unknown committed
1639
  if (!(res=item->val_str(str)))
unknown's avatar
unknown committed
1640
    null_value= 1;
unknown's avatar
unknown committed
1641 1642 1643 1644 1645 1646
  return res;
}


longlong Item_func_case::val_int()
{
1647
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1648
  char buff[MAX_FIELD_WIDTH];
1649
  String dummy_str(buff,sizeof(buff),default_charset());
unknown's avatar
unknown committed
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
  Item *item=find_item(&dummy_str);
  longlong res;

  if (!item)
  {
    null_value=1;
    return 0;
  }
  res=item->val_int();
  null_value=item->null_value;
  return res;
}

1663
double Item_func_case::val_real()
unknown's avatar
unknown committed
1664
{
1665
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1666
  char buff[MAX_FIELD_WIDTH];
1667
  String dummy_str(buff,sizeof(buff),default_charset());
unknown's avatar
unknown committed
1668 1669 1670 1671 1672 1673 1674 1675
  Item *item=find_item(&dummy_str);
  double res;

  if (!item)
  {
    null_value=1;
    return 0;
  }
1676
  res= item->val_real();
unknown's avatar
unknown committed
1677 1678 1679 1680
  null_value=item->null_value;
  return res;
}

unknown's avatar
unknown committed
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701

my_decimal *Item_func_case::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed == 1);
  char buff[MAX_FIELD_WIDTH];
  String dummy_str(buff, sizeof(buff), default_charset());
  Item *item= find_item(&dummy_str);
  my_decimal *res;

  if (!item)
  {
    null_value=1;
    return 0;
  }

  res= item->val_decimal(decimal_value);
  null_value= item->null_value;
  return res;
}


unknown's avatar
unknown committed
1702
bool Item_func_case::fix_fields(THD *thd, Item **ref)
unknown's avatar
unknown committed
1703 1704 1705 1706 1707 1708
{
  /*
    buff should match stack usage from
    Item_func_case::val_int() -> Item_func_case::find_item()
  */
  char buff[MAX_FIELD_WIDTH*2+sizeof(String)*2+sizeof(String*)*2+sizeof(double)*2+sizeof(longlong)*2];
unknown's avatar
unknown committed
1709 1710 1711 1712 1713
  bool res= Item_func::fix_fields(thd, ref);
  /*
    Call check_stack_overrun after fix_fields to be sure that stack variable
    is not optimized away
  */
unknown's avatar
unknown committed
1714 1715
  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
    return TRUE;				// Fatal error flag is set!
unknown's avatar
unknown committed
1716
  return res;
unknown's avatar
unknown committed
1717 1718 1719 1720
}



unknown's avatar
unknown committed
1721
void Item_func_case::fix_length_and_dec()
1722
{
1723 1724
  Item **agg;
  uint nagg;
1725
  THD *thd= current_thd;
1726 1727 1728 1729
  
  if (!(agg= (Item**) sql_alloc(sizeof(Item*)*(ncases+1))))
    return;
  
1730 1731 1732 1733
  /*
    Aggregate all THEN and ELSE expression types
    and collations when string result
  */
1734 1735 1736 1737 1738 1739 1740 1741 1742
  
  for (nagg= 0 ; nagg < ncases/2 ; nagg++)
    agg[nagg]= args[nagg*2+1];
  
  if (else_expr_num != -1)
    agg[nagg++]= args[else_expr_num];
  
  agg_result_type(&cached_result_type, agg, nagg);
  if ((cached_result_type == STRING_RESULT) &&
unknown's avatar
unknown committed
1743
      agg_arg_charsets(collation, agg, nagg, MY_COLL_ALLOW_CONV))
1744 1745 1746
    return;
  
  
unknown's avatar
unknown committed
1747 1748 1749 1750
  /*
    Aggregate first expression and all THEN expression types
    and collations when string comparison
  */
1751
  if (first_expr_num != -1)
1752
  {
1753 1754
    agg[0]= args[first_expr_num];
    for (nagg= 0; nagg < ncases/2 ; nagg++)
unknown's avatar
unknown committed
1755
      agg[nagg+1]= args[nagg*2];
1756
    nagg++;
1757
    agg_cmp_type(thd, &cmp_type, agg, nagg);
1758
    if ((cmp_type == STRING_RESULT) &&
unknown's avatar
unknown committed
1759
        agg_arg_charsets(cmp_collation, agg, nagg, MY_COLL_CMP_CONV))
unknown's avatar
unknown committed
1760
      return;
1761
  }
1762
  
unknown's avatar
unknown committed
1763
  if (else_expr_num == -1 || args[else_expr_num]->maybe_null)
1764
    maybe_null=1;
1765
  
unknown's avatar
unknown committed
1766 1767
  max_length=0;
  decimals=0;
1768
  for (uint i=0 ; i < ncases ; i+=2)
unknown's avatar
unknown committed
1769 1770 1771 1772
  {
    set_if_bigger(max_length,args[i+1]->max_length);
    set_if_bigger(decimals,args[i+1]->decimals);
  }
1773
  if (else_expr_num != -1) 
unknown's avatar
unknown committed
1774
  {
1775 1776
    set_if_bigger(max_length,args[else_expr_num]->max_length);
    set_if_bigger(decimals,args[else_expr_num]->decimals);
unknown's avatar
unknown committed
1777 1778 1779
  }
}

unknown's avatar
unknown committed
1780

unknown's avatar
unknown committed
1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
uint Item_func_case::decimal_precision() const
{
  int max_int_part=0;
  for (uint i=0 ; i < ncases ; i+=2)
    set_if_bigger(max_int_part, args[i+1]->decimal_int_part());

  if (else_expr_num != -1) 
    set_if_bigger(max_int_part, args[else_expr_num]->decimal_int_part());
  return min(max_int_part + decimals, DECIMAL_MAX_PRECISION);
}


1793
/* TODO:  Fix this so that it prints the whole CASE expression */
unknown's avatar
unknown committed
1794 1795 1796

void Item_func_case::print(String *str)
{
1797
  str->append(STRING_WITH_LEN("(case "));
1798 1799 1800 1801 1802 1803 1804
  if (first_expr_num != -1)
  {
    args[first_expr_num]->print(str);
    str->append(' ');
  }
  for (uint i=0 ; i < ncases ; i+=2)
  {
1805
    str->append(STRING_WITH_LEN("when "));
1806
    args[i]->print(str);
1807
    str->append(STRING_WITH_LEN(" then "));
1808 1809 1810 1811 1812
    args[i+1]->print(str);
    str->append(' ');
  }
  if (else_expr_num != -1)
  {
1813
    str->append(STRING_WITH_LEN("else "));
1814 1815 1816
    args[else_expr_num]->print(str);
    str->append(' ');
  }
1817
  str->append(STRING_WITH_LEN("end)"));
unknown's avatar
unknown committed
1818 1819 1820
}

/*
1821
  Coalesce - return first not NULL argument.
unknown's avatar
unknown committed
1822 1823
*/

unknown's avatar
unknown committed
1824
String *Item_func_coalesce::str_op(String *str)
unknown's avatar
unknown committed
1825
{
1826
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1827 1828 1829
  null_value=0;
  for (uint i=0 ; i < arg_count ; i++)
  {
unknown's avatar
unknown committed
1830 1831 1832
    String *res;
    if ((res=args[i]->val_str(str)))
      return res;
unknown's avatar
unknown committed
1833 1834 1835 1836 1837
  }
  null_value=1;
  return 0;
}

unknown's avatar
unknown committed
1838
longlong Item_func_coalesce::int_op()
unknown's avatar
unknown committed
1839
{
1840
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851
  null_value=0;
  for (uint i=0 ; i < arg_count ; i++)
  {
    longlong res=args[i]->val_int();
    if (!args[i]->null_value)
      return res;
  }
  null_value=1;
  return 0;
}

unknown's avatar
unknown committed
1852
double Item_func_coalesce::real_op()
unknown's avatar
unknown committed
1853
{
1854
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
1855 1856 1857
  null_value=0;
  for (uint i=0 ; i < arg_count ; i++)
  {
1858
    double res= args[i]->val_real();
unknown's avatar
unknown committed
1859 1860 1861 1862 1863 1864 1865 1866
    if (!args[i]->null_value)
      return res;
  }
  null_value=1;
  return 0;
}


unknown's avatar
unknown committed
1867
my_decimal *Item_func_coalesce::decimal_op(my_decimal *decimal_value)
unknown's avatar
unknown committed
1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
{
  DBUG_ASSERT(fixed == 1);
  null_value= 0;
  for (uint i= 0; i < arg_count; i++)
  {
    my_decimal *res= args[i]->val_decimal(decimal_value);
    if (!args[i]->null_value)
      return res;
  }
  null_value=1;
  return 0;
}


unknown's avatar
unknown committed
1882 1883
void Item_func_coalesce::fix_length_and_dec()
{
unknown's avatar
unknown committed
1884 1885
  agg_result_type(&hybrid_type, args, arg_count);
  switch (hybrid_type) {
unknown's avatar
unknown committed
1886 1887 1888
  case STRING_RESULT:
    count_only_length();
    decimals= NOT_FIXED_DEC;
unknown's avatar
unknown committed
1889
    agg_arg_charsets(collation, args, arg_count, MY_COLL_ALLOW_CONV);
unknown's avatar
unknown committed
1890 1891 1892 1893 1894 1895 1896 1897 1898
    break;
  case DECIMAL_RESULT:
    count_decimal_length();
    break;
  case REAL_RESULT:
    count_real_length();
    break;
  case INT_RESULT:
    count_only_length();
1899
    decimals= 0;
unknown's avatar
unknown committed
1900 1901
    break;
  case ROW_RESULT:
1902
  default:
unknown's avatar
unknown committed
1903 1904
    DBUG_ASSERT(0);
  }
unknown's avatar
unknown committed
1905 1906 1907
}

/****************************************************************************
1908
 Classes and function for the IN operator
unknown's avatar
unknown committed
1909 1910
****************************************************************************/

1911
static int cmp_longlong(void *cmp_arg, longlong *a,longlong *b)
unknown's avatar
unknown committed
1912 1913 1914 1915
{
  return *a < *b ? -1 : *a == *b ? 0 : 1;
}

1916
static int cmp_double(void *cmp_arg, double *a,double *b)
unknown's avatar
unknown committed
1917 1918 1919 1920
{
  return *a < *b ? -1 : *a == *b ? 0 : 1;
}

unknown's avatar
unknown committed
1921
static int cmp_row(void *cmp_arg, cmp_item_row *a, cmp_item_row *b)
unknown's avatar
unknown committed
1922 1923 1924 1925
{
  return a->compare(b);
}

unknown's avatar
unknown committed
1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938

static int cmp_decimal(void *cmp_arg, my_decimal *a, my_decimal *b)
{
  /*
    We need call of fixing buffer pointer, because fast sort just copy
    decimal buffers in memory and pointers left pointing on old buffer place
  */
  a->fix_buffer_pointer();
  b->fix_buffer_pointer();
  return my_decimal_cmp(a, b);
}


unknown's avatar
unknown committed
1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950
int in_vector::find(Item *item)
{
  byte *result=get_value(item);
  if (!result || !used_count)
    return 0;				// Null value

  uint start,end;
  start=0; end=used_count-1;
  while (start != end)
  {
    uint mid=(start+end+1)/2;
    int res;
1951
    if ((res=(*compare)(collation, base+mid*size, result)) == 0)
unknown's avatar
unknown committed
1952 1953 1954 1955 1956 1957
      return 1;
    if (res < 0)
      start=mid;
    else
      end=mid-1;
  }
1958
  return (int) ((*compare)(collation, base+start*size, result) == 0);
unknown's avatar
unknown committed
1959 1960
}

1961 1962
in_string::in_string(uint elements,qsort2_cmp cmp_func, CHARSET_INFO *cs)
  :in_vector(elements, sizeof(String), cmp_func, cs),
1963
   tmp(buff, sizeof(buff), &my_charset_bin)
unknown's avatar
unknown committed
1964 1965 1966 1967
{}

in_string::~in_string()
{
1968
  if (base)
1969
  {
unknown's avatar
unknown committed
1970
    // base was allocated with help of sql_alloc => following is OK
1971 1972
    for (uint i=0 ; i < count ; i++)
      ((String*) base)[i].free();
1973
  }
unknown's avatar
unknown committed
1974 1975 1976 1977 1978 1979 1980
}

void in_string::set(uint pos,Item *item)
{
  String *str=((String*) base)+pos;
  String *res=item->val_str(str);
  if (res && res != str)
1981 1982 1983
  {
    if (res->uses_buffer_owned_by(str))
      res->copy();
unknown's avatar
unknown committed
1984
    *str= *res;
1985
  }
1986
  if (!str->charset())
1987 1988
  {
    CHARSET_INFO *cs;
1989
    if (!(cs= item->collation.collation))
1990
      cs= &my_charset_bin;		// Should never happen for STR items
1991 1992
    str->set_charset(cs);
  }
unknown's avatar
unknown committed
1993 1994
}

1995

unknown's avatar
unknown committed
1996 1997 1998 1999 2000
byte *in_string::get_value(Item *item)
{
  return (byte*) item->val_str(&tmp);
}

unknown's avatar
unknown committed
2001 2002
in_row::in_row(uint elements, Item * item)
{
2003
  base= (char*) new cmp_item_row[count= elements];
unknown's avatar
unknown committed
2004
  size= sizeof(cmp_item_row);
2005
  compare= (qsort2_cmp) cmp_row;
unknown's avatar
unknown committed
2006
  tmp.store_value(item);
2007 2008 2009 2010 2011 2012
  /*
    We need to reset these as otherwise we will call sort() with
    uninitialized (even if not used) elements
  */
  used_count= elements;
  collation= 0;
2013 2014 2015 2016 2017
}

in_row::~in_row()
{
  if (base)
2018
    delete [] (cmp_item_row*) base;
unknown's avatar
unknown committed
2019 2020 2021 2022 2023
}

byte *in_row::get_value(Item *item)
{
  tmp.store_value(item);
unknown's avatar
unknown committed
2024 2025
  if (item->is_null())
    return 0;
unknown's avatar
unknown committed
2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
  return (byte *)&tmp;
}

void in_row::set(uint pos, Item *item)
{
  DBUG_ENTER("in_row::set");
  DBUG_PRINT("enter", ("pos %u item 0x%lx", pos, (ulong) item));
  ((cmp_item_row*) base)[pos].store_value_by_template(&tmp, item);
  DBUG_VOID_RETURN;
}
unknown's avatar
unknown committed
2036 2037

in_longlong::in_longlong(uint elements)
2038
  :in_vector(elements,sizeof(longlong),(qsort2_cmp) cmp_longlong, 0)
unknown's avatar
unknown committed
2039 2040 2041 2042 2043 2044 2045 2046 2047
{}

void in_longlong::set(uint pos,Item *item)
{
  ((longlong*) base)[pos]=item->val_int();
}

byte *in_longlong::get_value(Item *item)
{
unknown's avatar
unknown committed
2048
  tmp= item->val_int();
unknown's avatar
unknown committed
2049
  if (item->null_value)
unknown's avatar
unknown committed
2050
    return 0;
unknown's avatar
unknown committed
2051 2052 2053 2054
  return (byte*) &tmp;
}

in_double::in_double(uint elements)
2055
  :in_vector(elements,sizeof(double),(qsort2_cmp) cmp_double, 0)
unknown's avatar
unknown committed
2056 2057 2058 2059
{}

void in_double::set(uint pos,Item *item)
{
2060
  ((double*) base)[pos]= item->val_real();
unknown's avatar
unknown committed
2061 2062 2063 2064
}

byte *in_double::get_value(Item *item)
{
2065
  tmp= item->val_real();
unknown's avatar
unknown committed
2066
  if (item->null_value)
2067
    return 0;					/* purecov: inspected */
unknown's avatar
unknown committed
2068 2069 2070
  return (byte*) &tmp;
}

unknown's avatar
unknown committed
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099

in_decimal::in_decimal(uint elements)
  :in_vector(elements, sizeof(my_decimal),(qsort2_cmp) cmp_decimal, 0)
{}


void in_decimal::set(uint pos, Item *item)
{
  /* as far as 'item' is constant, we can store reference on my_decimal */
  my_decimal *dec= ((my_decimal *)base) + pos;
  dec->len= DECIMAL_BUFF_LENGTH;
  dec->fix_buffer_pointer();
  my_decimal *res= item->val_decimal(dec);
  if (res != dec)
    my_decimal2decimal(res, dec);
}


byte *in_decimal::get_value(Item *item)
{
  my_decimal *result= item->val_decimal(&val);
  if (item->null_value)
    return 0;
  return (byte *)result;
}


cmp_item* cmp_item::get_comparator(Item_result type,
                                   CHARSET_INFO *cs)
2100
{
unknown's avatar
unknown committed
2101
  switch (type) {
2102
  case STRING_RESULT:
unknown's avatar
unknown committed
2103
    return new cmp_item_sort_string(cs);
2104 2105 2106 2107 2108 2109
  case INT_RESULT:
    return new cmp_item_int;
  case REAL_RESULT:
    return new cmp_item_real;
  case ROW_RESULT:
    return new cmp_item_row;
unknown's avatar
unknown committed
2110 2111
  case DECIMAL_RESULT:
    return new cmp_item_decimal;
unknown's avatar
unknown committed
2112 2113 2114
  default:
    DBUG_ASSERT(0);
    break;
2115 2116 2117 2118
  }
  return 0; // to satisfy compiler :)
}

2119

unknown's avatar
unknown committed
2120 2121
cmp_item* cmp_item_sort_string::make_same()
{
2122
  return new cmp_item_sort_string_in_static(cmp_charset);
unknown's avatar
unknown committed
2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139
}

cmp_item* cmp_item_int::make_same()
{
  return new cmp_item_int();
}

cmp_item* cmp_item_real::make_same()
{
  return new cmp_item_real();
}

cmp_item* cmp_item_row::make_same()
{
  return new cmp_item_row();
}

2140 2141 2142 2143

cmp_item_row::~cmp_item_row()
{
  DBUG_ENTER("~cmp_item_row");
2144
  DBUG_PRINT("enter",("this: 0x%lx", this));
2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156
  if (comparators)
  {
    for (uint i= 0; i < n; i++)
    {
      if (comparators[i])
	delete comparators[i];
    }
  }
  DBUG_VOID_RETURN;
}


2157 2158
void cmp_item_row::store_value(Item *item)
{
2159
  DBUG_ENTER("cmp_item_row::store_value");
2160
  n= item->cols();
2161
  if (!comparators)
unknown's avatar
unknown committed
2162
    comparators= (cmp_item **) current_thd->calloc(sizeof(cmp_item *)*n);
2163
  if (comparators)
2164
  {
2165
    item->bring_value();
unknown's avatar
unknown committed
2166
    item->null_value= 0;
2167
    for (uint i=0; i < n; i++)
2168
    {
unknown's avatar
unknown committed
2169
      if (!comparators[i])
unknown's avatar
unknown committed
2170 2171 2172
        if (!(comparators[i]=
              cmp_item::get_comparator(item->el(i)->result_type(),
                                       item->el(i)->collation.collation)))
unknown's avatar
unknown committed
2173
	  break;					// new failed
2174 2175 2176
      comparators[i]->store_value(item->el(i));
      item->null_value|= item->el(i)->null_value;
    }
2177
  }
2178
  DBUG_VOID_RETURN;
2179 2180
}

2181

unknown's avatar
unknown committed
2182 2183 2184 2185 2186
void cmp_item_row::store_value_by_template(cmp_item *t, Item *item)
{
  cmp_item_row *tmpl= (cmp_item_row*) t;
  if (tmpl->n != item->cols())
  {
unknown's avatar
unknown committed
2187
    my_error(ER_OPERAND_COLUMNS, MYF(0), tmpl->n);
unknown's avatar
unknown committed
2188 2189 2190 2191 2192
    return;
  }
  n= tmpl->n;
  if ((comparators= (cmp_item **) sql_alloc(sizeof(cmp_item *)*n)))
  {
2193
    item->bring_value();
unknown's avatar
unknown committed
2194 2195
    item->null_value= 0;
    for (uint i=0; i < n; i++)
2196 2197 2198 2199 2200 2201 2202
    {
      if (!(comparators[i]= tmpl->comparators[i]->make_same()))
	break;					// new failed
      comparators[i]->store_value_by_template(tmpl->comparators[i],
					      item->el(i));
      item->null_value|= item->el(i)->null_value;
    }
unknown's avatar
unknown committed
2203 2204 2205
  }
}

2206

2207 2208
int cmp_item_row::cmp(Item *arg)
{
unknown's avatar
unknown committed
2209 2210 2211
  arg->null_value= 0;
  if (arg->cols() != n)
  {
unknown's avatar
unknown committed
2212
    my_error(ER_OPERAND_COLUMNS, MYF(0), n);
unknown's avatar
unknown committed
2213 2214
    return 1;
  }
unknown's avatar
unknown committed
2215
  bool was_null= 0;
2216
  arg->bring_value();
unknown's avatar
unknown committed
2217
  for (uint i=0; i < n; i++)
2218
  {
unknown's avatar
unknown committed
2219
    if (comparators[i]->cmp(arg->el(i)))
unknown's avatar
unknown committed
2220
    {
unknown's avatar
unknown committed
2221 2222 2223
      if (!arg->el(i)->null_value)
	return 1;
      was_null= 1;
unknown's avatar
unknown committed
2224
    }
2225
  }
unknown's avatar
unknown committed
2226
  return (arg->null_value= was_null);
unknown's avatar
unknown committed
2227 2228
}

2229

unknown's avatar
unknown committed
2230 2231 2232
int cmp_item_row::compare(cmp_item *c)
{
  cmp_item_row *cmp= (cmp_item_row *) c;
unknown's avatar
unknown committed
2233
  for (uint i=0; i < n; i++)
2234 2235
  {
    int res;
unknown's avatar
unknown committed
2236
    if ((res= comparators[i]->compare(cmp->comparators[i])))
unknown's avatar
unknown committed
2237
      return res;
2238
  }
2239 2240
  return 0;
}
unknown's avatar
unknown committed
2241

2242

unknown's avatar
unknown committed
2243 2244 2245
void cmp_item_decimal::store_value(Item *item)
{
  my_decimal *val= item->val_decimal(&value);
unknown's avatar
unknown committed
2246 2247
  /* val may be zero if item is nnull */
  if (val && val != &value)
unknown's avatar
unknown committed
2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260
    my_decimal2decimal(val, &value);
}


int cmp_item_decimal::cmp(Item *arg)
{
  my_decimal tmp_buf, *tmp= arg->val_decimal(&tmp_buf);
  if (arg->null_value)
    return 1;
  return my_decimal_cmp(&value, tmp);
}


unknown's avatar
unknown committed
2261
int cmp_item_decimal::compare(cmp_item *arg)
unknown's avatar
unknown committed
2262
{
unknown's avatar
unknown committed
2263
  cmp_item_decimal *cmp= (cmp_item_decimal*) arg;
unknown's avatar
unknown committed
2264 2265 2266 2267 2268 2269 2270 2271 2272 2273
  return my_decimal_cmp(&value, &cmp->value);
}


cmp_item* cmp_item_decimal::make_same()
{
  return new cmp_item_decimal();
}


unknown's avatar
unknown committed
2274 2275 2276
bool Item_func_in::nulls_in_row()
{
  Item **arg,**arg_end;
2277
  for (arg= args+1, arg_end= args+arg_count; arg != arg_end ; arg++)
unknown's avatar
unknown committed
2278 2279 2280 2281 2282 2283 2284
  {
    if ((*arg)->null_inside())
      return 1;
  }
  return 0;
}

2285

unknown's avatar
unknown committed
2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
/*
  Perform context analysis of an IN item tree

  SYNOPSIS:
    fix_fields()
    thd     reference to the global context of the query thread
    tables  list of all open tables involved in the query
    ref     pointer to Item* variable where pointer to resulting "fixed"
            item is to be assigned

  DESCRIPTION
    This function performs context analysis (name resolution) and calculates
    various attributes of the item tree with Item_func_in as its root.
    The function saves in ref the pointer to the item or to a newly created
    item that is considered as a replacement for the original one.

  NOTES
    Let T0(e)/T1(e) be the value of not_null_tables(e) when e is used on
    a predicate/function level. Then it's easy to show that:
      T0(e IN(e1,...,en))     = union(T1(e),intersection(T1(ei)))
      T1(e IN(e1,...,en))     = union(T1(e),intersection(T1(ei)))
      T0(e NOT IN(e1,...,en)) = union(T1(e),union(T1(ei)))
      T1(e NOT IN(e1,...,en)) = union(T1(e),intersection(T1(ei)))

  RETURN
    0   ok
    1   got error
*/

bool
2316
Item_func_in::fix_fields(THD *thd, Item **ref)
unknown's avatar
unknown committed
2317 2318 2319
{
  Item **arg, **arg_end;

2320
  if (Item_func_opt_neg::fix_fields(thd, ref))
unknown's avatar
unknown committed
2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335
    return 1;

  /* not_null_tables_cache == union(T1(e),union(T1(ei))) */
  if (pred_level && negated)
    return 0;

  /* not_null_tables_cache = union(T1(e),intersection(T1(ei))) */
  not_null_tables_cache= ~(table_map) 0;
  for (arg= args + 1, arg_end= args + arg_count; arg != arg_end; arg++)
    not_null_tables_cache&= (*arg)->not_null_tables();
  not_null_tables_cache|= (*args)->not_null_tables();
  return 0;
}


2336
static int srtcmp_in(CHARSET_INFO *cs, const String *x,const String *y)
2337
{
2338
  return cs->coll->strnncollsp(cs,
unknown's avatar
unknown committed
2339
                               (uchar *) x->ptr(),x->length(),
2340
                               (uchar *) y->ptr(),y->length(), 0);
2341 2342
}

2343

unknown's avatar
unknown committed
2344 2345
void Item_func_in::fix_length_and_dec()
{
2346 2347
  Item **arg, **arg_end;
  uint const_itm= 1;
2348
  THD *thd= current_thd;
2349
  
2350
  agg_cmp_type(thd, &cmp_type, args, arg_count);
2351

unknown's avatar
unknown committed
2352 2353 2354 2355
  if (cmp_type == STRING_RESULT &&
      agg_arg_charsets(cmp_collation, args, arg_count, MY_COLL_CMP_CONV))
    return;

2356
  for (arg=args+1, arg_end=args+arg_count; arg != arg_end ; arg++)
unknown's avatar
unknown committed
2357 2358 2359 2360 2361 2362 2363
  {
    if (!arg[0]->const_item())
    {
      const_itm= 0;
      break;
    }
  }
2364

unknown's avatar
unknown committed
2365 2366 2367 2368
  /*
    Row item with NULLs inside can return NULL or FALSE => 
    they can't be processed as static
  */
2369
  if (const_itm && !nulls_in_row())
unknown's avatar
unknown committed
2370
  {
2371
    switch (cmp_type) {
unknown's avatar
unknown committed
2372
    case STRING_RESULT:
2373
      array=new in_string(arg_count-1,(qsort2_cmp) srtcmp_in, 
2374
			  cmp_collation.collation);
unknown's avatar
unknown committed
2375 2376
      break;
    case INT_RESULT:
2377
      array= new in_longlong(arg_count-1);
unknown's avatar
unknown committed
2378 2379
      break;
    case REAL_RESULT:
2380
      array= new in_double(arg_count-1);
unknown's avatar
unknown committed
2381
      break;
unknown's avatar
unknown committed
2382
    case ROW_RESULT:
2383
      array= new in_row(arg_count-1, args[0]);
unknown's avatar
unknown committed
2384
      break;
unknown's avatar
unknown committed
2385 2386 2387
    case DECIMAL_RESULT:
      array= new in_decimal(arg_count - 1);
      break;
unknown's avatar
unknown committed
2388 2389 2390
    default:
      DBUG_ASSERT(0);
      return;
unknown's avatar
unknown committed
2391
    }
2392
    if (array && !(thd->is_fatal_error))		// If not EOM
unknown's avatar
unknown committed
2393
    {
unknown's avatar
unknown committed
2394
      uint j=0;
unknown's avatar
unknown committed
2395
      for (uint i=1 ; i < arg_count ; i++)
unknown's avatar
unknown committed
2396 2397 2398 2399
      {
	array->set(j,args[i]);
	if (!args[i]->null_value)			// Skip NULL values
	  j++;
unknown's avatar
unknown committed
2400 2401
	else
	  have_null= 1;
unknown's avatar
unknown committed
2402 2403 2404
      }
      if ((array->used_count=j))
	array->sort();
unknown's avatar
unknown committed
2405 2406 2407 2408
    }
  }
  else
  {
unknown's avatar
unknown committed
2409
    in_item= cmp_item::get_comparator(cmp_type, cmp_collation.collation);
2410
    if (cmp_type  == STRING_RESULT)
2411
      in_item->cmp_charset= cmp_collation.collation;
unknown's avatar
unknown committed
2412
  }
2413
  maybe_null= args[0]->maybe_null;
unknown's avatar
unknown committed
2414
  max_length= 1;
unknown's avatar
unknown committed
2415 2416 2417 2418 2419 2420
}


void Item_func_in::print(String *str)
{
  str->append('(');
2421
  args[0]->print(str);
unknown's avatar
unknown committed
2422
  if (negated)
2423 2424
    str->append(STRING_WITH_LEN(" not"));
  str->append(STRING_WITH_LEN(" in ("));
unknown's avatar
unknown committed
2425
  print_args(str, 1);
2426
  str->append(STRING_WITH_LEN("))"));
unknown's avatar
unknown committed
2427 2428 2429 2430 2431
}


longlong Item_func_in::val_int()
{
2432
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2433 2434
  if (array)
  {
2435 2436
    int tmp=array->find(args[0]);
    null_value=args[0]->null_value || (!tmp && have_null);
unknown's avatar
unknown committed
2437
    return (longlong) (!null_value && tmp != negated);
unknown's avatar
unknown committed
2438
  }
2439 2440
  in_item->store_value(args[0]);
  if ((null_value=args[0]->null_value))
unknown's avatar
unknown committed
2441
    return 0;
2442
  have_null= 0;
2443
  for (uint i=1 ; i < arg_count ; i++)
unknown's avatar
unknown committed
2444 2445
  {
    if (!in_item->cmp(args[i]) && !args[i]->null_value)
unknown's avatar
unknown committed
2446
      return (longlong) (!negated);
2447
    have_null|= args[i]->null_value;
unknown's avatar
unknown committed
2448
  }
2449
  null_value= have_null;
unknown's avatar
unknown committed
2450
  return (longlong) (!null_value && negated);
unknown's avatar
unknown committed
2451 2452 2453 2454 2455
}


longlong Item_func_bit_or::val_int()
{
2456
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475
  ulonglong arg1= (ulonglong) args[0]->val_int();
  if (args[0]->null_value)
  {
    null_value=1; /* purecov: inspected */
    return 0; /* purecov: inspected */
  }
  ulonglong arg2= (ulonglong) args[1]->val_int();
  if (args[1]->null_value)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (longlong) (arg1 | arg2);
}


longlong Item_func_bit_and::val_int()
{
2476
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492
  ulonglong arg1= (ulonglong) args[0]->val_int();
  if (args[0]->null_value)
  {
    null_value=1; /* purecov: inspected */
    return 0; /* purecov: inspected */
  }
  ulonglong arg2= (ulonglong) args[1]->val_int();
  if (args[1]->null_value)
  {
    null_value=1; /* purecov: inspected */
    return 0; /* purecov: inspected */
  }
  null_value=0;
  return (longlong) (arg1 & arg2);
}

2493
Item_cond::Item_cond(THD *thd, Item_cond *item)
2494
  :Item_bool_func(thd, item),
2495 2496
   abort_on_null(item->abort_on_null),
   and_tables_cache(item->and_tables_cache)
2497 2498
{
  /*
unknown's avatar
unknown committed
2499
    item->list will be copied by copy_andor_arguments() call
2500 2501 2502
  */
}

unknown's avatar
unknown committed
2503

2504 2505 2506
void Item_cond::copy_andor_arguments(THD *thd, Item_cond *item)
{
  List_iterator_fast<Item> li(item->list);
unknown's avatar
unknown committed
2507
  while (Item *it= li++)
2508 2509
    list.push_back(it->copy_andor_structure(thd));
}
unknown's avatar
unknown committed
2510

unknown's avatar
unknown committed
2511

unknown's avatar
unknown committed
2512
bool
2513
Item_cond::fix_fields(THD *thd, Item **ref)
unknown's avatar
unknown committed
2514
{
2515
  DBUG_ASSERT(fixed == 0);
unknown's avatar
unknown committed
2516 2517
  List_iterator<Item> li(list);
  Item *item;
2518
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
2519
  char buff[sizeof(char*)];			// Max local vars in function
2520
#endif
2521
  not_null_tables_cache= used_tables_cache= 0;
unknown's avatar
unknown committed
2522
  const_item_cache= 1;
2523 2524 2525 2526 2527
  /*
    and_table_cache is the value that Item_cond_or() returns for
    not_null_tables()
  */
  and_tables_cache= ~(table_map) 0;
unknown's avatar
unknown committed
2528

2529
  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
unknown's avatar
unknown committed
2530
    return TRUE;				// Fatal error flag is set!
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545
  /*
    The following optimization reduces the depth of an AND-OR tree.
    E.g. a WHERE clause like
      F1 AND (F2 AND (F2 AND F4))
    is parsed into a tree with the same nested structure as defined
    by braces. This optimization will transform such tree into
      AND (F1, F2, F3, F4).
    Trees of OR items are flattened as well:
      ((F1 OR F2) OR (F3 OR F4))   =>   OR (F1, F2, F3, F4)
    Items for removed AND/OR levels will dangle until the death of the
    entire statement.
    The optimization is currently prepared statements and stored procedures
    friendly as it doesn't allocate any memory and its effects are durable
    (i.e. do not depend on PS/SP arguments).
  */
unknown's avatar
unknown committed
2546 2547
  while ((item=li++))
  {
2548
    table_map tmp_table_map;
unknown's avatar
unknown committed
2549
    while (item->type() == Item::COND_ITEM &&
2550 2551
	   ((Item_cond*) item)->functype() == functype() &&
           !((Item_cond*) item)->list.is_empty())
unknown's avatar
unknown committed
2552 2553 2554 2555 2556
    {						// Identical function
      li.replace(((Item_cond*) item)->list);
      ((Item_cond*) item)->list.empty();
      item= *li.ref();				// new current item
    }
2557 2558
    if (abort_on_null)
      item->top_level_item();
2559 2560

    // item can be substituted in fix_fields
2561
    if ((!item->fixed &&
2562
	 item->fix_fields(thd, li.ref())) ||
2563
	(item= *li.ref())->check_cols(1))
unknown's avatar
unknown committed
2564
      return TRUE; /* purecov: inspected */
2565
    used_tables_cache|=     item->used_tables();
unknown's avatar
unknown committed
2566 2567 2568 2569 2570 2571 2572
    if (!item->const_item())
    {
      tmp_table_map= item->not_null_tables();
      not_null_tables_cache|= tmp_table_map;
      and_tables_cache&= tmp_table_map;
      const_item_cache= FALSE;
    }  
2573
    with_sum_func=	    with_sum_func || item->with_sum_func;
unknown's avatar
unknown committed
2574 2575
    if (item->maybe_null)
      maybe_null=1;
unknown's avatar
unknown committed
2576
  }
2577
  thd->lex->current_select->cond_count+= list.elements;
unknown's avatar
unknown committed
2578
  fix_length_and_dec();
2579
  fixed= 1;
unknown's avatar
unknown committed
2580
  return FALSE;
unknown's avatar
unknown committed
2581 2582
}

unknown's avatar
unknown committed
2583 2584 2585 2586 2587 2588 2589 2590 2591 2592
bool Item_cond::walk(Item_processor processor, byte *arg)
{
  List_iterator_fast<Item> li(list);
  Item *item;
  while ((item= li++))
    if (item->walk(processor, arg))
      return 1;
  return Item_func::walk(processor, arg);
}

unknown's avatar
unknown committed
2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604

/*
  Transform an Item_cond object with a transformer callback function
   
  SYNOPSIS
    transform()
    transformer   the transformer callback function to be applied to the nodes
                  of the tree of the object
    arg           parameter to be passed to the transformer
  
  DESCRIPTION
    The function recursively applies the transform method with the
unknown's avatar
unknown committed
2605
    same transformer to each member item of the condition list.
unknown's avatar
unknown committed
2606 2607 2608 2609 2610 2611 2612 2613 2614 2615
    If the call of the method for a member item returns a new item
    the old item is substituted for a new one.
    After this the transform method is applied to the root node
    of the Item_cond object. 
     
  RETURN VALUES
    Item returned as the result of transformation of the root node 
*/

Item *Item_cond::transform(Item_transformer transformer, byte *arg)
2616 2617 2618 2619 2620
{
  List_iterator<Item> li(list);
  Item *item;
  while ((item= li++))
  {
unknown's avatar
unknown committed
2621
    Item *new_item= item->transform(transformer, arg);
2622 2623 2624 2625 2626
    if (!new_item)
      return 0;
    if (new_item != item)
      li.replace(new_item);
  }
unknown's avatar
unknown committed
2627
  return Item_func::transform(transformer, arg);
2628 2629
}

2630 2631
void Item_cond::traverse_cond(Cond_traverser traverser,
                              void *arg, traverse_order order)
2632 2633 2634 2635
{
  List_iterator<Item> li(list);
  Item *item;

2636 2637 2638 2639 2640 2641 2642
  switch(order) {
  case(PREFIX):
    (*traverser)(this, arg);
    while ((item= li++))
    {
      item->traverse_cond(traverser, arg, order);
    }
2643
    (*traverser)(NULL, arg);
2644 2645 2646 2647 2648 2649 2650
    break;
  case(POSTFIX):
    while ((item= li++))
    {
      item->traverse_cond(traverser, arg, order);
    }
    (*traverser)(this, arg);
2651 2652
  }
}
unknown's avatar
unknown committed
2653

2654 2655 2656 2657
/*
  Move SUM items out from item tree and replace with reference

  SYNOPSIS
2658 2659 2660 2661
    split_sum_func()
    thd			Thread handler
    ref_pointer_array	Pointer to array of reference fields
    fields		All fields in select
2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672

  NOTES
   This function is run on all expression (SELECT list, WHERE, HAVING etc)
   that have or refer (HAVING) to a SUM expression.

   The split is done to get an unique item for each SUM function
   so that we can easily find and calculate them.
   (Calculation done by update_sum_func() and copy_sum_funcs() in
   sql_select.cc)
*/

2673 2674
void Item_cond::split_sum_func(THD *thd, Item **ref_pointer_array,
                               List<Item> &fields)
unknown's avatar
unknown committed
2675 2676 2677
{
  List_iterator<Item> li(list);
  Item *item;
2678
  while ((item= li++))
unknown's avatar
unknown committed
2679
    item->split_sum_func2(thd, ref_pointer_array, fields, li.ref(), TRUE);
unknown's avatar
unknown committed
2680 2681 2682 2683 2684 2685 2686 2687 2688
}


table_map
Item_cond::used_tables() const
{						// This caches used_tables
  return used_tables_cache;
}

2689

unknown's avatar
unknown committed
2690 2691
void Item_cond::update_used_tables()
{
unknown's avatar
unknown committed
2692
  List_iterator_fast<Item> li(list);
unknown's avatar
unknown committed
2693
  Item *item;
2694 2695 2696

  used_tables_cache=0;
  const_item_cache=1;
unknown's avatar
unknown committed
2697 2698 2699
  while ((item=li++))
  {
    item->update_used_tables();
2700
    used_tables_cache|= item->used_tables();
unknown's avatar
unknown committed
2701
    const_item_cache&= item->const_item();
unknown's avatar
unknown committed
2702 2703 2704 2705 2706 2707 2708
  }
}


void Item_cond::print(String *str)
{
  str->append('(');
unknown's avatar
unknown committed
2709
  List_iterator_fast<Item> li(list);
unknown's avatar
unknown committed
2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722
  Item *item;
  if ((item=li++))
    item->print(str);
  while ((item=li++))
  {
    str->append(' ');
    str->append(func_name());
    str->append(' ');
    item->print(str);
  }
  str->append(')');
}

2723

2724
void Item_cond::neg_arguments(THD *thd)
2725 2726 2727 2728 2729
{
  List_iterator<Item> li(list);
  Item *item;
  while ((item= li++))		/* Apply not transformation to the arguments */
  {
2730 2731 2732
    Item *new_item= item->neg_transformer(thd);
    if (!new_item)
    {
unknown's avatar
unknown committed
2733 2734
      if (!(new_item= new Item_func_not(item)))
	return;					// Fatal OEM error
2735 2736
    }
    VOID(li.replace(new_item));
2737 2738 2739 2740
  }
}


2741
/*
unknown's avatar
unknown committed
2742
  Evaluation of AND(expr, expr, expr ...)
2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757

  NOTES:
    abort_if_null is set for AND expressions for which we don't care if the
    result is NULL or 0. This is set for:
    - WHERE clause
    - HAVING clause
    - IF(expression)

  RETURN VALUES
    1  If all expressions are true
    0  If all expressions are false or if we find a NULL expression and
       'abort_on_null' is set.
    NULL if all expression are either 1 or NULL
*/

unknown's avatar
unknown committed
2758 2759 2760

longlong Item_cond_and::val_int()
{
2761
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2762
  List_iterator_fast<Item> li(list);
unknown's avatar
unknown committed
2763
  Item *item;
2764
  null_value= 0;
unknown's avatar
unknown committed
2765 2766
  while ((item=li++))
  {
unknown's avatar
unknown committed
2767
    if (!item->val_bool())
unknown's avatar
unknown committed
2768
    {
2769 2770
      if (abort_on_null || !(null_value= item->null_value))
	return 0;				// return FALSE
unknown's avatar
unknown committed
2771 2772
    }
  }
2773
  return null_value ? 0 : 1;
unknown's avatar
unknown committed
2774 2775
}

2776

unknown's avatar
unknown committed
2777 2778
longlong Item_cond_or::val_int()
{
2779
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2780
  List_iterator_fast<Item> li(list);
unknown's avatar
unknown committed
2781 2782 2783 2784
  Item *item;
  null_value=0;
  while ((item=li++))
  {
unknown's avatar
unknown committed
2785
    if (item->val_bool())
unknown's avatar
unknown committed
2786 2787 2788 2789 2790 2791 2792 2793 2794 2795
    {
      null_value=0;
      return 1;
    }
    if (item->null_value)
      null_value=1;
  }
  return 0;
}

2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819
/*
  Create an AND expression from two expressions

  SYNOPSIS
   and_expressions()
   a		expression or NULL
   b    	expression.
   org_item	Don't modify a if a == *org_item
		If a == NULL, org_item is set to point at b,
		to ensure that future calls will not modify b.

  NOTES
    This will not modify item pointed to by org_item or b
    The idea is that one can call this in a loop and create and
    'and' over all items without modifying any of the original items.

  RETURN
    NULL	Error
    Item
*/

Item *and_expressions(Item *a, Item *b, Item **org_item)
{
  if (!a)
2820
    return (*org_item= (Item*) b);
2821 2822 2823
  if (a == *org_item)
  {
    Item_cond *res;
2824
    if ((res= new Item_cond_and(a, (Item*) b)))
2825
    {
2826
      res->used_tables_cache= a->used_tables() | b->used_tables();
2827 2828
      res->not_null_tables_cache= a->not_null_tables() | b->not_null_tables();
    }
2829 2830
    return res;
  }
2831
  if (((Item_cond_and*) a)->add((Item*) b))
2832 2833
    return 0;
  ((Item_cond_and*) a)->used_tables_cache|= b->used_tables();
2834
  ((Item_cond_and*) a)->not_null_tables_cache|= b->not_null_tables();
2835 2836 2837 2838
  return a;
}


unknown's avatar
unknown committed
2839 2840
longlong Item_func_isnull::val_int()
{
2841
  DBUG_ASSERT(fixed == 1);
2842 2843 2844 2845 2846
  /*
    Handle optimization if the argument can't be null
    This has to be here because of the test in update_used_tables().
  */
  if (!used_tables_cache)
unknown's avatar
unknown committed
2847
    return cached_value;
unknown's avatar
unknown committed
2848
  return args[0]->is_null() ? 1: 0;
unknown's avatar
unknown committed
2849 2850
}

2851 2852
longlong Item_is_not_null_test::val_int()
{
2853
  DBUG_ASSERT(fixed == 1);
2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888
  DBUG_ENTER("Item_is_not_null_test::val_int");
  if (!used_tables_cache)
  {
    owner->was_null|= (!cached_value);
    DBUG_PRINT("info", ("cached :%d", cached_value));
    DBUG_RETURN(cached_value);
  }
  if (args[0]->is_null())
  {
    DBUG_PRINT("info", ("null"))
    owner->was_null|= 1;
    DBUG_RETURN(0);
  }
  else
    DBUG_RETURN(1);
}

/* Optimize case of not_null_column IS NULL */
void Item_is_not_null_test::update_used_tables()
{
  if (!args[0]->maybe_null)
  {
    used_tables_cache= 0;			/* is always true */
    cached_value= (longlong) 1;
  }
  else
  {
    args[0]->update_used_tables();
    if (!(used_tables_cache=args[0]->used_tables()))
    {
      /* Remember if the value is always NULL or never NULL */
      cached_value= (longlong) !args[0]->is_null();
    }
  }
}
2889

2890

unknown's avatar
unknown committed
2891 2892
longlong Item_func_isnotnull::val_int()
{
2893
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
2894
  return args[0]->is_null() ? 0 : 1;
unknown's avatar
unknown committed
2895 2896 2897
}


2898 2899 2900 2901
void Item_func_isnotnull::print(String *str)
{
  str->append('(');
  args[0]->print(str);
2902
  str->append(STRING_WITH_LEN(" is not null)"));
2903 2904 2905
}


unknown's avatar
unknown committed
2906 2907
longlong Item_func_like::val_int()
{
2908
  DBUG_ASSERT(fixed == 1);
2909
  String* res = args[0]->val_str(&tmp_value1);
unknown's avatar
unknown committed
2910 2911 2912 2913 2914
  if (args[0]->null_value)
  {
    null_value=1;
    return 0;
  }
2915
  String* res2 = args[1]->val_str(&tmp_value2);
unknown's avatar
unknown committed
2916 2917 2918 2919 2920 2921
  if (args[1]->null_value)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
2922 2923
  if (canDoTurboBM)
    return turboBM_matches(res->ptr(), res->length()) ? 1 : 0;
2924
  return my_wildcmp(cmp.cmp_collation.collation,
2925 2926 2927
		    res->ptr(),res->ptr()+res->length(),
		    res2->ptr(),res2->ptr()+res2->length(),
		    escape,wild_one,wild_many) ? 0 : 1;
unknown's avatar
unknown committed
2928 2929 2930 2931 2932 2933 2934
}


/* We can optimize a where if first character isn't a wildcard */

Item_func::optimize_type Item_func_like::select_optimize() const
{
2935
  if (args[1]->const_item())
unknown's avatar
unknown committed
2936
  {
2937 2938 2939 2940 2941 2942
    String* res2= args[1]->val_str((String *)&tmp_value2);

    if (!res2)
      return OPTIMIZE_NONE;

    if (*res2->ptr() != wild_many)
unknown's avatar
unknown committed
2943
    {
2944
      if (args[0]->result_type() != STRING_RESULT || *res2->ptr() != wild_one)
unknown's avatar
unknown committed
2945 2946 2947 2948 2949 2950
	return OPTIMIZE_OP;
    }
  }
  return OPTIMIZE_NONE;
}

2951

2952
bool Item_func_like::fix_fields(THD *thd, Item **ref)
2953
{
2954
  DBUG_ASSERT(fixed == 0);
2955 2956
  if (Item_bool_func2::fix_fields(thd, ref) ||
      escape_item->fix_fields(thd, &escape_item))
unknown's avatar
unknown committed
2957
    return TRUE;
2958

2959
  if (!escape_item->const_during_execution())
2960
  {
2961
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"ESCAPE");
unknown's avatar
unknown committed
2962
    return TRUE;
2963 2964 2965 2966 2967 2968
  }
  
  if (escape_item->const_item())
  {
    /* If we are on execution stage */
    String *escape_str= escape_item->val_str(&tmp_value1);
2969 2970
    if (escape_str)
    {
2971 2972 2973 2974 2975 2976 2977 2978 2979
      if (escape_used_in_parsing && (
             (((thd->variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES) &&
                escape_str->numchars() != 1) ||
               escape_str->numchars() > 1)))
      {
        my_error(ER_WRONG_ARGUMENTS,MYF(0),"ESCAPE");
        return TRUE;
      }

unknown's avatar
unknown committed
2980
      if (use_mb(cmp.cmp_collation.collation))
2981
      {
2982
        CHARSET_INFO *cs= escape_str->charset();
2983 2984 2985 2986 2987 2988 2989 2990 2991
        my_wc_t wc;
        int rc= cs->cset->mb_wc(cs, &wc,
                                (const uchar*) escape_str->ptr(),
                                (const uchar*) escape_str->ptr() +
                                               escape_str->length());
        escape= (int) (rc > 0 ? wc : '\\');
      }
      else
      {
unknown's avatar
unknown committed
2992 2993 2994 2995 2996
        /*
          In the case of 8bit character set, we pass native
          code instead of Unicode code as "escape" argument.
          Convert to "cs" if charset of escape differs.
        */
unknown's avatar
unknown committed
2997
        CHARSET_INFO *cs= cmp.cmp_collation.collation;
unknown's avatar
unknown committed
2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010
        uint32 unused;
        if (escape_str->needs_conversion(escape_str->length(),
                                         escape_str->charset(), cs, &unused))
        {
          char ch;
          uint errors;
          uint32 cnvlen= copy_and_convert(&ch, 1, cs, escape_str->ptr(),
                                          escape_str->length(),
                                          escape_str->charset(), &errors);
          escape= cnvlen ? ch : '\\';
        }
        else
          escape= *(escape_str->ptr());
3011 3012 3013 3014
      }
    }
    else
      escape= '\\';
unknown's avatar
unknown committed
3015

3016
    /*
3017 3018
      We could also do boyer-more for non-const items, but as we would have to
      recompute the tables for each row it's not worth it.
3019
    */
3020 3021
    if (args[1]->const_item() && !use_strnxfrm(collation.collation) &&
       !(specialflag & SPECIAL_NO_NEW_FUNC))
3022
    {
3023 3024
      String* res2 = args[1]->val_str(&tmp_value2);
      if (!res2)
unknown's avatar
unknown committed
3025
        return FALSE;				// Null argument
3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045
      
      const size_t len   = res2->length();
      const char*  first = res2->ptr();
      const char*  last  = first + len - 1;
      /*
        len must be > 2 ('%pattern%')
        heuristic: only do TurboBM for pattern_len > 2
      */
      
      if (len > MIN_TURBOBM_PATTERN_LEN + 2 &&
          *first == wild_many &&
          *last  == wild_many)
      {
        const char* tmp = first + 1;
        for (; *tmp != wild_many && *tmp != wild_one && *tmp != escape; tmp++) ;
        canDoTurboBM = (tmp == last) && !use_mb(args[0]->collation.collation);
      }
      if (canDoTurboBM)
      {
        pattern     = first + 1;
3046
        pattern_len = (int) len - 2;
3047
        DBUG_PRINT("info", ("Initializing pattern: '%s'", first));
3048 3049 3050
        int *suff = (int*) thd->alloc((int) (sizeof(int)*
                                      ((pattern_len + 1)*2+
                                      alphabet_size)));
3051 3052 3053 3054 3055 3056
        bmGs      = suff + pattern_len + 1;
        bmBc      = bmGs + pattern_len + 1;
        turboBM_compute_good_suffix_shifts(suff);
        turboBM_compute_bad_character_shifts();
        DBUG_PRINT("info",("done"));
      }
3057 3058
    }
  }
unknown's avatar
unknown committed
3059
  return FALSE;
3060 3061
}

3062 3063 3064 3065 3066 3067
void Item_func_like::cleanup()
{
  canDoTurboBM= FALSE;
  Item_bool_func2::cleanup();
}

unknown's avatar
unknown committed
3068 3069 3070
#ifdef USE_REGEX

bool
3071
Item_func_regex::fix_fields(THD *thd, Item **ref)
unknown's avatar
unknown committed
3072
{
3073
  DBUG_ASSERT(fixed == 0);
unknown's avatar
unknown committed
3074
  if ((!args[0]->fixed &&
3075
       args[0]->fix_fields(thd, args)) || args[0]->check_cols(1) ||
unknown's avatar
unknown committed
3076
      (!args[1]->fixed &&
3077
       args[1]->fix_fields(thd, args + 1)) || args[1]->check_cols(1))
unknown's avatar
unknown committed
3078
    return TRUE;				/* purecov: inspected */
unknown's avatar
unknown committed
3079
  with_sum_func=args[0]->with_sum_func || args[1]->with_sum_func;
unknown's avatar
unknown committed
3080 3081
  max_length= 1;
  decimals= 0;
3082

unknown's avatar
unknown committed
3083
  if (agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV))
unknown's avatar
unknown committed
3084
    return TRUE;
3085

unknown's avatar
unknown committed
3086
  used_tables_cache=args[0]->used_tables() | args[1]->used_tables();
3087 3088
  not_null_tables_cache= (args[0]->not_null_tables() |
			  args[1]->not_null_tables());
unknown's avatar
unknown committed
3089 3090 3091 3092
  const_item_cache=args[0]->const_item() && args[1]->const_item();
  if (!regex_compiled && args[1]->const_item())
  {
    char buff[MAX_FIELD_WIDTH];
3093
    String tmp(buff,sizeof(buff),&my_charset_bin);
unknown's avatar
unknown committed
3094 3095 3096 3097
    String *res=args[1]->val_str(&tmp);
    if (args[1]->null_value)
    {						// Will always return NULL
      maybe_null=1;
unknown's avatar
unknown committed
3098
      return FALSE;
unknown's avatar
unknown committed
3099 3100
    }
    int error;
unknown's avatar
unknown committed
3101 3102 3103 3104 3105 3106
    if ((error= my_regcomp(&preg,res->c_ptr(),
                           ((cmp_collation.collation->state &
                             (MY_CS_BINSORT | MY_CS_CSSORT)) ?
                            REG_EXTENDED | REG_NOSUB :
                            REG_EXTENDED | REG_NOSUB | REG_ICASE),
                           cmp_collation.collation)))
unknown's avatar
unknown committed
3107
    {
unknown's avatar
unknown committed
3108
      (void) my_regerror(error,&preg,buff,sizeof(buff));
3109
      my_error(ER_REGEXP_ERROR, MYF(0), buff);
unknown's avatar
unknown committed
3110
      return TRUE;
unknown's avatar
unknown committed
3111 3112 3113 3114 3115 3116
    }
    regex_compiled=regex_is_const=1;
    maybe_null=args[0]->maybe_null;
  }
  else
    maybe_null=1;
3117
  fixed= 1;
unknown's avatar
unknown committed
3118
  return FALSE;
unknown's avatar
unknown committed
3119 3120
}

3121

unknown's avatar
unknown committed
3122 3123
longlong Item_func_regex::val_int()
{
3124
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
3125
  char buff[MAX_FIELD_WIDTH];
3126
  String *res, tmp(buff,sizeof(buff),&my_charset_bin);
unknown's avatar
unknown committed
3127 3128 3129 3130 3131 3132 3133 3134 3135 3136

  res=args[0]->val_str(&tmp);
  if (args[0]->null_value)
  {
    null_value=1;
    return 0;
  }
  if (!regex_is_const)
  {
    char buff2[MAX_FIELD_WIDTH];
3137
    String *res2, tmp2(buff2,sizeof(buff2),&my_charset_bin);
unknown's avatar
unknown committed
3138 3139 3140 3141 3142 3143 3144

    res2= args[1]->val_str(&tmp2);
    if (args[1]->null_value)
    {
      null_value=1;
      return 0;
    }
unknown's avatar
unknown committed
3145
    if (!regex_compiled || stringcmp(res2,&prev_regexp))
unknown's avatar
unknown committed
3146 3147 3148 3149
    {
      prev_regexp.copy(*res2);
      if (regex_compiled)
      {
unknown's avatar
unknown committed
3150
	my_regfree(&preg);
unknown's avatar
unknown committed
3151 3152
	regex_compiled=0;
      }
unknown's avatar
Merge  
unknown committed
3153
      if (my_regcomp(&preg,res2->c_ptr_safe(),
unknown's avatar
unknown committed
3154 3155 3156 3157 3158
                     ((cmp_collation.collation->state &
                       (MY_CS_BINSORT | MY_CS_CSSORT)) ?
                      REG_EXTENDED | REG_NOSUB :
                      REG_EXTENDED | REG_NOSUB | REG_ICASE),
                     cmp_collation.collation))
unknown's avatar
unknown committed
3159 3160 3161 3162 3163 3164 3165 3166
      {
	null_value=1;
	return 0;
      }
      regex_compiled=1;
    }
  }
  null_value=0;
unknown's avatar
unknown committed
3167
  return my_regexec(&preg,res->c_ptr(),0,(my_regmatch_t*) 0,0) ? 0 : 1;
unknown's avatar
unknown committed
3168 3169 3170
}


3171
void Item_func_regex::cleanup()
unknown's avatar
unknown committed
3172
{
3173 3174
  DBUG_ENTER("Item_func_regex::cleanup");
  Item_bool_func::cleanup();
unknown's avatar
unknown committed
3175 3176
  if (regex_compiled)
  {
unknown's avatar
unknown committed
3177
    my_regfree(&preg);
unknown's avatar
unknown committed
3178 3179
    regex_compiled=0;
  }
3180
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
3181 3182
}

3183

unknown's avatar
unknown committed
3184
#endif /* USE_REGEX */
3185 3186 3187


#ifdef LIKE_CMP_TOUPPER
unknown's avatar
unknown committed
3188
#define likeconv(cs,A) (uchar) (cs)->toupper(A)
3189
#else
unknown's avatar
unknown committed
3190
#define likeconv(cs,A) (uchar) (cs)->sort_order[(uchar) (A)]
3191 3192 3193 3194 3195 3196 3197 3198
#endif


/**********************************************************************
  turboBM_compute_suffixes()
  Precomputation dependent only on pattern_len.
**********************************************************************/

3199
void Item_func_like::turboBM_compute_suffixes(int *suff)
3200 3201 3202 3203
{
  const int   plm1 = pattern_len - 1;
  int            f = 0;
  int            g = plm1;
unknown's avatar
unknown committed
3204
  int *const splm1 = suff + plm1;
3205
  CHARSET_INFO	*cs= cmp.cmp_collation.collation;
3206 3207 3208

  *splm1 = pattern_len;

unknown's avatar
unknown committed
3209
  if (!cs->sort_order)
3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240
  {
    int i;
    for (i = pattern_len - 2; i >= 0; i--)
    {
      int tmp = *(splm1 + i - f);
      if (g < i && tmp < i - g)
	suff[i] = tmp;
      else
      {
	if (i < g)
	  g = i; // g = min(i, g)
	f = i;
	while (g >= 0 && pattern[g] == pattern[g + plm1 - f])
	  g--;
	suff[i] = f - g;
      }
    }
  }
  else
  {
    int i;
    for (i = pattern_len - 2; 0 <= i; --i)
    {
      int tmp = *(splm1 + i - f);
      if (g < i && tmp < i - g)
	suff[i] = tmp;
      else
      {
	if (i < g)
	  g = i; // g = min(i, g)
	f = i;
3241
	while (g >= 0 &&
unknown's avatar
unknown committed
3242
	       likeconv(cs, pattern[g]) == likeconv(cs, pattern[g + plm1 - f]))
3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255
	  g--;
	suff[i] = f - g;
      }
    }
  }
}


/**********************************************************************
   turboBM_compute_good_suffix_shifts()
   Precomputation dependent only on pattern_len.
**********************************************************************/

3256
void Item_func_like::turboBM_compute_good_suffix_shifts(int *suff)
3257 3258 3259
{
  turboBM_compute_suffixes(suff);

3260 3261
  int *end = bmGs + pattern_len;
  int *k;
3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274
  for (k = bmGs; k < end; k++)
    *k = pattern_len;

  int tmp;
  int i;
  int j          = 0;
  const int plm1 = pattern_len - 1;
  for (i = plm1; i > -1; i--)
  {
    if (suff[i] == i + 1)
    {
      for (tmp = plm1 - i; j < tmp; j++)
      {
3275
	int *tmp2 = bmGs + j;
3276 3277 3278 3279 3280 3281
	if (*tmp2 == pattern_len)
	  *tmp2 = tmp;
      }
    }
  }

3282
  int *tmp2;
3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302
  for (tmp = plm1 - i; j < tmp; j++)
  {
    tmp2 = bmGs + j;
    if (*tmp2 == pattern_len)
      *tmp2 = tmp;
  }

  tmp2 = bmGs + plm1;
  for (i = 0; i <= pattern_len - 2; i++)
    *(tmp2 - suff[i]) = plm1 - i;
}


/**********************************************************************
   turboBM_compute_bad_character_shifts()
   Precomputation dependent on pattern_len.
**********************************************************************/

void Item_func_like::turboBM_compute_bad_character_shifts()
{
unknown's avatar
unknown committed
3303 3304 3305 3306
  int *i;
  int *end = bmBc + alphabet_size;
  int j;
  const int plm1 = pattern_len - 1;
3307
  CHARSET_INFO	*cs= cmp.cmp_collation.collation;
unknown's avatar
unknown committed
3308

3309 3310 3311
  for (i = bmBc; i < end; i++)
    *i = pattern_len;

unknown's avatar
unknown committed
3312
  if (!cs->sort_order)
unknown's avatar
unknown committed
3313
  {
3314
    for (j = 0; j < plm1; j++)
3315
      bmBc[(uint) (uchar) pattern[j]] = plm1 - j;
unknown's avatar
unknown committed
3316
  }
3317
  else
unknown's avatar
unknown committed
3318
  {
3319
    for (j = 0; j < plm1; j++)
unknown's avatar
unknown committed
3320
      bmBc[(uint) likeconv(cs,pattern[j])] = plm1 - j;
unknown's avatar
unknown committed
3321
  }
3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336
}


/**********************************************************************
  turboBM_matches()
  Search for pattern in text, returns true/false for match/no match
**********************************************************************/

bool Item_func_like::turboBM_matches(const char* text, int text_len) const
{
  register int bcShift;
  register int turboShift;
  int shift = pattern_len;
  int j     = 0;
  int u     = 0;
3337
  CHARSET_INFO	*cs= cmp.cmp_collation.collation;
3338

3339 3340
  const int plm1=  pattern_len - 1;
  const int tlmpl= text_len - pattern_len;
3341 3342

  /* Searching */
unknown's avatar
unknown committed
3343
  if (!cs->sort_order)
3344 3345 3346
  {
    while (j <= tlmpl)
    {
3347
      register int i= plm1;
3348 3349 3350 3351
      while (i >= 0 && pattern[i] == text[i + j])
      {
	i--;
	if (i == plm1 - shift)
3352
	  i-= u;
3353 3354
      }
      if (i < 0)
unknown's avatar
unknown committed
3355
	return 1;
3356 3357 3358

      register const int v = plm1 - i;
      turboShift = u - v;
3359
      bcShift    = bmBc[(uint) (uchar) text[i + j]] - plm1 + i;
3360 3361 3362 3363 3364 3365 3366 3367 3368 3369
      shift      = max(turboShift, bcShift);
      shift      = max(shift, bmGs[i]);
      if (shift == bmGs[i])
	u = min(pattern_len - shift, v);
      else
      {
	if (turboShift < bcShift)
	  shift = max(shift, u + 1);
	u = 0;
      }
3370
      j+= shift;
3371
    }
unknown's avatar
unknown committed
3372
    return 0;
3373 3374 3375 3376 3377 3378
  }
  else
  {
    while (j <= tlmpl)
    {
      register int i = plm1;
unknown's avatar
unknown committed
3379
      while (i >= 0 && likeconv(cs,pattern[i]) == likeconv(cs,text[i + j]))
3380 3381 3382
      {
	i--;
	if (i == plm1 - shift)
3383
	  i-= u;
3384 3385
      }
      if (i < 0)
unknown's avatar
unknown committed
3386
	return 1;
3387 3388 3389

      register const int v = plm1 - i;
      turboShift = u - v;
unknown's avatar
unknown committed
3390
      bcShift    = bmBc[(uint) likeconv(cs, text[i + j])] - plm1 + i;
3391 3392 3393 3394 3395 3396 3397 3398 3399 3400
      shift      = max(turboShift, bcShift);
      shift      = max(shift, bmGs[i]);
      if (shift == bmGs[i])
	u = min(pattern_len - shift, v);
      else
      {
	if (turboShift < bcShift)
	  shift = max(shift, u + 1);
	u = 0;
      }
3401
      j+= shift;
3402
    }
unknown's avatar
unknown committed
3403
    return 0;
3404 3405
  }
}
unknown's avatar
unknown committed
3406

3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427

/*
  Make a logical XOR of the arguments.

  SYNOPSIS
    val_int()

  DESCRIPTION
  If either operator is NULL, return NULL.

  NOTE
    As we don't do any index optimization on XOR this is not going to be
    very fast to use.

  TODO (low priority)
    Change this to be optimized as:
      A XOR B   ->  (A) == 1 AND (B) <> 1) OR (A <> 1 AND (B) == 1)
    To be able to do this, we would however first have to extend the MySQL
    range optimizer to handle OR better.
*/

unknown's avatar
unknown committed
3428 3429
longlong Item_cond_xor::val_int()
{
3430
  DBUG_ASSERT(fixed == 1);
unknown's avatar
unknown committed
3431 3432 3433
  List_iterator<Item> li(list);
  Item *item;
  int result=0;	
3434
  null_value=0;
unknown's avatar
unknown committed
3435 3436
  while ((item=li++))
  {
3437 3438 3439 3440 3441 3442
    result^= (item->val_int() != 0);
    if (item->null_value)
    {
      null_value=1;
      return 0;
    }
unknown's avatar
unknown committed
3443
  }
3444
  return (longlong) result;
unknown's avatar
unknown committed
3445
}
3446 3447 3448 3449

/*
  Apply NOT transformation to the item and return a new one.

unknown's avatar
unknown committed
3450
  SYNOPSIS
3451
    neg_transformer()
3452
    thd		thread handler
3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472

  DESCRIPTION
    Transform the item using next rules:
       a AND b AND ...    -> NOT(a) OR NOT(b) OR ...
       a OR b OR ...      -> NOT(a) AND NOT(b) AND ...
       NOT(a)             -> a
       a = b              -> a != b
       a != b             -> a = b
       a < b              -> a >= b
       a >= b             -> a < b
       a > b              -> a <= b
       a <= b             -> a > b
       IS NULL(a)         -> IS NOT NULL(a)
       IS NOT NULL(a)     -> IS NULL(a)

  RETURN
    New item or
    NULL if we cannot apply NOT transformation (see Item::neg_transformer()).
*/

3473
Item *Item_func_not::neg_transformer(THD *thd)	/* NOT(x)  ->  x */
3474
{
unknown's avatar
unknown committed
3475
  return args[0];
3476 3477
}

3478 3479

Item *Item_bool_rowready_func2::neg_transformer(THD *thd)
3480
{
3481 3482
  Item *item= negated_item();
  return item;
3483 3484
}

3485 3486 3487

/* a IS NULL  ->  a IS NOT NULL */
Item *Item_func_isnull::neg_transformer(THD *thd)
3488
{
3489 3490
  Item *item= new Item_func_isnotnull(args[0]);
  return item;
3491 3492
}

3493 3494 3495

/* a IS NOT NULL  ->  a IS NULL */
Item *Item_func_isnotnull::neg_transformer(THD *thd)
3496
{
3497 3498
  Item *item= new Item_func_isnull(args[0]);
  return item;
3499 3500
}

3501 3502 3503

Item *Item_cond_and::neg_transformer(THD *thd)	/* NOT(a AND b AND ...)  -> */
					/* NOT a OR NOT b OR ... */
3504
{
3505 3506 3507
  neg_arguments(thd);
  Item *item= new Item_cond_or(list);
  return item;
3508 3509
}

3510 3511 3512

Item *Item_cond_or::neg_transformer(THD *thd)	/* NOT(a OR b OR ...)  -> */
					/* NOT a AND NOT b AND ... */
3513
{
3514 3515 3516
  neg_arguments(thd);
  Item *item= new Item_cond_and(list);
  return item;
3517 3518
}

3519 3520

Item *Item_func_eq::negated_item()		/* a = b  ->  a != b */
3521
{
3522
  return new Item_func_ne(args[0], args[1]);
3523 3524
}

3525 3526

Item *Item_func_ne::negated_item()		/* a != b  ->  a = b */
3527
{
3528
  return new Item_func_eq(args[0], args[1]);
3529 3530
}

3531 3532

Item *Item_func_lt::negated_item()		/* a < b  ->  a >= b */
3533
{
3534
  return new Item_func_ge(args[0], args[1]);
3535 3536
}

3537 3538

Item *Item_func_ge::negated_item()		/* a >= b  ->  a < b */
3539
{
3540
  return new Item_func_lt(args[0], args[1]);
3541 3542
}

3543 3544

Item *Item_func_gt::negated_item()		/* a > b  ->  a <= b */
3545
{
3546
  return new Item_func_le(args[0], args[1]);
3547 3548
}

3549 3550

Item *Item_func_le::negated_item()		/* a <= b  ->  a > b */
3551
{
3552
  return new Item_func_gt(args[0], args[1]);
3553 3554
}

3555 3556
// just fake method, should never be called
Item *Item_bool_rowready_func2::negated_item()
3557
{
3558 3559
  DBUG_ASSERT(0);
  return 0;
3560
}
3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577

Item_equal::Item_equal(Item_field *f1, Item_field *f2)
  : Item_bool_func(), const_item(0), eval_item(0), cond_false(0)
{
  const_item_cache= 0;
  fields.push_back(f1);
  fields.push_back(f2);
}

Item_equal::Item_equal(Item *c, Item_field *f)
  : Item_bool_func(), eval_item(0), cond_false(0)
{
  const_item_cache= 0;
  fields.push_back(f);
  const_item= c;
}

3578

3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603
Item_equal::Item_equal(Item_equal *item_equal)
  : Item_bool_func(), eval_item(0), cond_false(0)
{
  const_item_cache= 0;
  List_iterator_fast<Item_field> li(item_equal->fields);
  Item_field *item;
  while ((item= li++))
  {
    fields.push_back(item);
  }
  const_item= item_equal->const_item;
  cond_false= item_equal->cond_false;
}

void Item_equal::add(Item *c)
{
  if (cond_false)
    return;
  if (!const_item)
  {
    const_item= c;
    return;
  }
  Item_func_eq *func= new Item_func_eq(c, const_item);
  func->set_cmp_func();
unknown's avatar
unknown committed
3604
  func->quick_fix_field();
3605 3606 3607 3608 3609 3610 3611 3612
  cond_false =  !(func->val_int());
}

void Item_equal::add(Item_field *f)
{
  fields.push_back(f);
}

unknown's avatar
unknown committed
3613 3614
uint Item_equal::members()
{
3615
  return fields.elements;
unknown's avatar
unknown committed
3616 3617 3618 3619 3620 3621 3622 3623
}


/*
  Check whether a field is referred in the multiple equality 

  SYNOPSIS
    contains()
unknown's avatar
unknown committed
3624
    field   field whose occurrence is to be checked
unknown's avatar
unknown committed
3625 3626
  
  DESCRIPTION
unknown's avatar
unknown committed
3627
    The function checks whether field is occurred in the Item_equal object 
unknown's avatar
unknown committed
3628 3629 3630 3631 3632 3633
    
  RETURN VALUES
    1       if nultiple equality contains a reference to field
    0       otherwise    
*/

3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645
bool Item_equal::contains(Field *field)
{
  List_iterator_fast<Item_field> it(fields);
  Item_field *item;
  while ((item= it++))
  {
    if (field->eq(item->field))
        return 1;
  }
  return 0;
}

unknown's avatar
unknown committed
3646 3647 3648 3649 3650 3651 3652 3653 3654

/*
  Join members of another Item_equal object  

  SYNOPSIS
    merge()
    item    multiple equality whose members are to be joined
  
  DESCRIPTION
unknown's avatar
unknown committed
3655
    The function actually merges two multiple equalities.
unknown's avatar
unknown committed
3656 3657 3658 3659 3660 3661 3662 3663 3664
    After this operation the Item_equal object additionally contains
    the field items of another item of the type Item_equal.
    If the optional constant items are not equal the cond_false flag is
    set to 1.  
       
  RETURN VALUES
    none    
*/

3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675
void Item_equal::merge(Item_equal *item)
{
  fields.concat(&item->fields);
  Item *c= item->const_item;
  if (c)
  {
    /* 
      The flag cond_false will be set to 1 after this, if 
      the multiple equality already contains a constant and its 
      value is  not equal to the value of c.
    */
unknown's avatar
unknown committed
3676
    add(c);
3677 3678 3679 3680
  }
  cond_false|= item->cond_false;
} 

unknown's avatar
unknown committed
3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706

/*
  Order field items in multiple equality according to a sorting criteria 

  SYNOPSIS
    sort()
    cmp          function to compare field item 
    arg          context extra parameter for the cmp function
  
  DESCRIPTION
    The function perform ordering of the field items in the Item_equal
    object according to the criteria determined by the cmp callback parameter.
    If cmp(item_field1,item_field2,arg)<0 than item_field1 must be
    placed after item_fiel2.

  IMPLEMENTATION
    The function sorts field items by the exchange sort algorithm.
    The list of field items is looked through and whenever two neighboring
    members follow in a wrong order they are swapped. This is performed
    again and again until we get all members in a right order.
         
  RETURN VALUES
    None    
*/

void Item_equal::sort(Item_field_cmpfunc cmp, void *arg)
3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718
{
  bool swap;
  List_iterator<Item_field> it(fields);
  do
  {
    Item_field *item1= it++;
    Item_field **ref1= it.ref();
    Item_field *item2;

    swap= FALSE;
    while ((item2= it++))
    {
unknown's avatar
unknown committed
3719 3720
      Item_field **ref2= it.ref();
      if (cmp(item1, item2, arg) < 0)
3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736
      {
        Item_field *item= *ref1;
        *ref1= *ref2;
        *ref2= item;
        swap= TRUE;
      }
      else
      {
        item1= item2;
        ref1= ref2;
      }
    }
    it.rewind();
  } while (swap);
}

3737
bool Item_equal::fix_fields(THD *thd, Item **ref)
3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761
{
  List_iterator_fast<Item_field> li(fields);
  Item *item;
  not_null_tables_cache= used_tables_cache= 0;
  const_item_cache= 0;
  while ((item=li++))
  {
    table_map tmp_table_map;
    used_tables_cache|= item->used_tables();
    tmp_table_map= item->not_null_tables();
    not_null_tables_cache|= tmp_table_map;
    if (item->maybe_null)
      maybe_null=1;
  }
  fix_length_and_dec();
  fixed= 1;
  return 0;
}

void Item_equal::update_used_tables()
{
  List_iterator_fast<Item_field> li(fields);
  Item *item;
  not_null_tables_cache= used_tables_cache= 0;
unknown's avatar
unknown committed
3762 3763
  if ((const_item_cache= cond_false))
    return;
3764 3765 3766 3767 3768 3769 3770 3771 3772 3773
  while ((item=li++))
  {
    item->update_used_tables();
    used_tables_cache|= item->used_tables();
    const_item_cache&= item->const_item();
  }
}

longlong Item_equal::val_int()
{
3774
  Item_field *item_field;
3775 3776 3777 3778 3779 3780 3781
  if (cond_false)
    return 0;
  List_iterator_fast<Item_field> it(fields);
  Item *item= const_item ? const_item : it++;
  if ((null_value= item->null_value))
    return 0;
  eval_item->store_value(item);
3782
  while ((item_field= it++))
3783
  {
3784 3785 3786 3787 3788 3789
    /* Skip fields of non-const tables. They haven't been read yet */
    if (item_field->field->table->const_table)
    {
      if ((null_value= item_field->null_value) || eval_item->cmp(item_field))
        return 0;
    }
3790 3791 3792 3793 3794 3795 3796
  }
  return 1;
}

void Item_equal::fix_length_and_dec()
{
  Item *item= const_item ? const_item : get_first();
unknown's avatar
unknown committed
3797 3798
  eval_item= cmp_item::get_comparator(item->result_type(),
                                      item->collation.collation);
3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812
  if (item->result_type() == STRING_RESULT)
    eval_item->cmp_charset= cmp_collation.collation;
}

bool Item_equal::walk(Item_processor processor, byte *arg)
{
  List_iterator_fast<Item_field> it(fields);
  Item *item;
  while ((item= it++))
    if (item->walk(processor, arg))
      return 1;
  return Item_func::walk(processor, arg);
}

unknown's avatar
unknown committed
3813
Item *Item_equal::transform(Item_transformer transformer, byte *arg)
3814 3815 3816 3817 3818
{
  List_iterator<Item_field> it(fields);
  Item *item;
  while ((item= it++))
  {
unknown's avatar
unknown committed
3819
    Item *new_item= item->transform(transformer, arg);
3820 3821 3822 3823 3824
    if (!new_item)
      return 0;
    if (new_item != item)
      it.replace((Item_field *) new_item);
  }
unknown's avatar
unknown committed
3825
  return Item_func::transform(transformer, arg);
3826 3827 3828 3829 3830 3831 3832 3833
}

void Item_equal::print(String *str)
{
  str->append(func_name());
  str->append('(');
  List_iterator_fast<Item_field> it(fields);
  Item *item;
unknown's avatar
unknown committed
3834 3835 3836 3837 3838
  if (const_item)
    const_item->print(str);
  else
  {
    item= it++;
3839
    item->print(str);
unknown's avatar
unknown committed
3840
  }
3841 3842 3843 3844 3845 3846 3847 3848 3849
  while ((item= it++))
  {
    str->append(',');
    str->append(' ');
    item->print(str);
  }
  str->append(')');
}