item_func.cc 125 KB
Newer Older
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
1
/* Copyright (C) 2000-2003 MySQL AB
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

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


/* This file defines all numerical functions */

20
#ifdef USE_PRAGMA_IMPLEMENTATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
21 22 23 24
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
25
#include "slave.h"				// for wait_for_master_pos
bk@work.mysql.com's avatar
bk@work.mysql.com committed
26 27 28 29 30
#include <m_ctype.h>
#include <hash.h>
#include <time.h>
#include <ft_global.h>

31 32 33
#include "sp_head.h"
#include "sp_rcontext.h"
#include "sp.h"
34

monty@mysql.com's avatar
monty@mysql.com committed
35 36 37 38 39
#ifdef NO_EMBEDDED_ACCESS_CHECKS
#define sp_restore_security_context(A,B) while (0) {}
#endif


40 41 42 43 44 45 46 47 48 49
bool check_reserved_words(LEX_STRING *name)
{
  if (!my_strcasecmp(system_charset_info, name->str, "GLOBAL") ||
      !my_strcasecmp(system_charset_info, name->str, "LOCAL") ||
      !my_strcasecmp(system_charset_info, name->str, "SESSION"))
    return TRUE;
  return FALSE;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
50 51 52 53 54 55 56 57
/* return TRUE if item is a constant */

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

58

59
void Item_func::set_arguments(List<Item> &list)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
60
{
61
  allowed_arg_cols= 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
62
  arg_count=list.elements;
monty@mysql.com's avatar
monty@mysql.com committed
63 64
  args= tmp_arg;                                // If 2 arguments
  if (arg_count <= 2 || (args=(Item**) sql_alloc(sizeof(Item*)*arg_count)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
65
  {
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
66
    List_iterator_fast<Item> li(list);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
67
    Item *item;
monty@mysql.com's avatar
monty@mysql.com committed
68
    Item **save_args= args;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
69 70 71

    while ((item=li++))
    {
monty@mysql.com's avatar
monty@mysql.com committed
72
      *(save_args++)= item;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
73 74 75 76 77 78
      with_sum_func|=item->with_sum_func;
    }
  }
  list.empty();					// Fields are used
}

79 80 81 82 83 84
Item_func::Item_func(List<Item> &list)
  :allowed_arg_cols(1)
{
  set_arguments(list);
}

85
Item_func::Item_func(THD *thd, Item_func *item)
86
  :Item_result_field(thd, item),
87 88 89 90 91
   allowed_arg_cols(item->allowed_arg_cols),
   arg_count(item->arg_count),
   used_tables_cache(item->used_tables_cache),
   not_null_tables_cache(item->not_null_tables_cache),
   const_item_cache(item->const_item_cache)
92 93 94 95 96 97 98 99 100 101
{
  if (arg_count)
  {
    if (arg_count <=2)
      args= tmp_arg;
    else
    {
      if (!(args=(Item**) thd->alloc(sizeof(Item*)*arg_count)))
	return;
    }
102
    memcpy((char*) args, (char*) item->args, sizeof(Item*)*arg_count);
103 104 105
  }
}

monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
106 107

/*
108
  Resolve references to table column for a function and its argument
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123

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

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

    Sets as a side effect the following class variables:
      maybe_null	Set if any argument may return NULL
      with_sum_func	Set if any of the arguments contains a sum function
konstantin@mysql.com's avatar
konstantin@mysql.com committed
124
      used_tables_cache Set to union of the tables used by arguments
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
125 126 127

      str_value.charset If this is a string function, set this to the
			character set for the first argument.
128
			If any argument is binary, this is set to binary
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
129 130 131 132 133 134 135

   If for any item any of the defaults are wrong, then this can
   be fixed in the fix_length_and_dec() function that is called
   after this one or by writing a specialized fix_fields() for the
   item.

  RETURN VALUES
136 137
  FALSE	ok
  TRUE	Got error.  Stored with my_error().
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
138 139
*/

bk@work.mysql.com's avatar
bk@work.mysql.com committed
140
bool
141
Item_func::fix_fields(THD *thd, Item **ref)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
142
{
143
  DBUG_ASSERT(fixed == 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
144
  Item **arg,**arg_end;
145 146 147
#ifndef EMBEDDED_LIBRARY			// Avoid compiler warning
  char buff[STACK_BUFF_ALLOC];			// Max argument in function
#endif
148

149
  used_tables_cache= not_null_tables_cache= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
150 151
  const_item_cache=1;

152
  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
153
    return TRUE;				// Fatal error if flag is set!
bk@work.mysql.com's avatar
bk@work.mysql.com committed
154 155 156 157
  if (arg_count)
  {						// Print purify happy
    for (arg=args, arg_end=args+arg_count; arg != arg_end ; arg++)
    {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
158
      Item *item;
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
159 160 161 162
      /*
	We can't yet set item to *arg as fix_fields may change *arg
	We shouldn't call fix_fields() twice, so check 'fixed' field first
      */
163
      if ((!(*arg)->fixed && (*arg)->fix_fields(thd, arg)))
164
	return TRUE;				/* purecov: inspected */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
165
      item= *arg;
166 167 168 169 170 171 172 173 174 175 176 177 178 179

      if (allowed_arg_cols)
      {
        if (item->check_cols(allowed_arg_cols))
          return 1;
      }
      else
      {
        /*  we have to fetch allowed_arg_cols from first argument */
        DBUG_ASSERT(arg == args); // it is first argument
        allowed_arg_cols= item->cols();
        DBUG_ASSERT(allowed_arg_cols); // Can't be 0 any more
      }

180
      if (item->maybe_null)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
181
	maybe_null=1;
182

183
      with_sum_func= with_sum_func || item->with_sum_func;
184 185 186
      used_tables_cache|=     item->used_tables();
      not_null_tables_cache|= item->not_null_tables();
      const_item_cache&=      item->const_item();
187
      with_subselect|=        item->with_subselect;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
188 189 190
    }
  }
  fix_length_and_dec();
191 192
  if (thd->net.report_error) // An error inside fix_length_and_dec occured
    return TRUE;
193
  fixed= 1;
194
  return FALSE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
195 196
}

197 198 199

bool Item_func::walk(Item_processor processor, bool walk_subquery,
                     byte *argument)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
200 201 202 203 204 205
{
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
206
      if ((*arg)->walk(processor, walk_subquery, argument))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
207 208 209 210 211
	return 1;
    }
  }
  return (this->*processor)(argument);
}
212

213 214
void Item_func::traverse_cond(Cond_traverser traverser,
                              void *argument, traverse_order order)
215 216 217 218
{
  if (arg_count)
  {
    Item **arg,**arg_end;
219 220 221

    switch (order) {
    case(PREFIX):
mskold@mysql.com's avatar
mskold@mysql.com committed
222
      (*traverser)(this, argument);
223 224 225 226 227 228 229 230 231 232
      for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
      {
	(*arg)->traverse_cond(traverser, argument, order);
      }
      break;
    case (POSTFIX):
      for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
      {
	(*arg)->traverse_cond(traverser, argument, order);
      }
mskold@mysql.com's avatar
mskold@mysql.com committed
233
      (*traverser)(this, argument);
234 235 236 237
    }
  }
}

igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
238 239 240 241 242 243

/*
  Transform an Item_func object with a transformer callback function
   
  SYNOPSIS
    transform()
244 245 246
      transformer   the transformer callback function to be applied to the nodes
                    of the tree of the object
      argument      parameter to be passed to the transformer
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
247 248
  
  DESCRIPTION
249 250 251
    The function recursively applies the transform method to each
    argument of the Item_func node.
    If the call of the method for an argument item returns a new item
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
252
    the old item is substituted for a new one.
253
    After this the transformer is applied to the root node
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
254 255 256 257 258 259 260
    of the Item_func object. 
     
  RETURN VALUES
    Item returned as the result of transformation of the root node 
*/

Item *Item_func::transform(Item_transformer transformer, byte *argument)
261
{
262 263
  DBUG_ASSERT(!current_thd->is_stmt_prepare());

264 265 266 267 268
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
269
      Item *new_item= (*arg)->transform(transformer, argument);
270 271
      if (!new_item)
	return 0;
272 273 274 275 276 277 278

      /*
        THD::change_item_tree() should be called only if the tree was
        really transformed, i.e. when a new item has been created.
        Otherwise we'll be allocating a lot of unnecessary memory for
        change records at each execution.
      */
monty@mysql.com's avatar
monty@mysql.com committed
279 280
      if (*arg != new_item)
        current_thd->change_item_tree(arg, new_item);
281 282
    }
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
283
  return (this->*transformer)(argument);
284 285 286
}


287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326
/*
  Compile Item_func object with a processor and a transformer callback functions
   
  SYNOPSIS
    compile()
      analyzer      the analyzer callback function to be applied to the nodes
                    of the tree of the object
      arg_p         in/out parameter to be passed to the processor
      transformer   the transformer callback function to be applied to the nodes
                    of the tree of the object
      arg_t         parameter to be passed to the transformer
  
  DESCRIPTION
    First the function applies the analyzer to the root node of
    the Item_func object. Then if the analizer succeeeds (returns TRUE)
    the function recursively applies the compile method to each argument
    of the Item_func node.
    If the call of the method for an argument item returns a new item
    the old item is substituted for a new one.
    After this the transformer is applied to the root node
    of the Item_func object. 
     
  RETURN VALUES
    Item returned as the result of transformation of the root node 
*/

Item *Item_func::compile(Item_analyzer analyzer, byte **arg_p,
                         Item_transformer transformer, byte *arg_t)
{
  if (!(this->*analyzer)(arg_p))
    return 0;
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
      /* 
        The same parameter value of arg_p must be passed
        to analyze any argument of the condition formula.
      */   
327
      byte *arg_v= *arg_p;
328 329 330 331 332 333 334 335
      Item *new_item= (*arg)->compile(analyzer, &arg_v, transformer, arg_t);
      if (new_item && *arg != new_item)
        current_thd->change_item_tree(arg, new_item);
    }
  }
  return (this->*transformer)(arg_t);
}

336 337
/* See comments in Item_cmp_func::split_sum_func() */

338 339
void Item_func::split_sum_func(THD *thd, Item **ref_pointer_array,
                               List<Item> &fields)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
340
{
341 342
  Item **arg, **arg_end;
  for (arg= args, arg_end= args+arg_count; arg != arg_end ; arg++)
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
343
    (*arg)->split_sum_func2(thd, ref_pointer_array, fields, arg, TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364
}


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


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

365 366 367 368 369 370 371

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


bk@work.mysql.com's avatar
bk@work.mysql.com committed
372 373 374 375
void Item_func::print(String *str)
{
  str->append(func_name());
  str->append('(');
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
376
  print_args(str, 0);
377 378 379 380
  str->append(')');
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
381
void Item_func::print_args(String *str, uint from)
382
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
383
  for (uint i=from ; i < arg_count ; i++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
384
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
385
    if (i != from)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405
      str->append(',');
    args[i]->print(str);
  }
}


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

monty@mysql.com's avatar
monty@mysql.com committed
406

407
bool Item_func::eq(const Item *item, bool binary_cmp) const
bk@work.mysql.com's avatar
bk@work.mysql.com committed
408 409 410 411 412 413 414 415 416 417 418
{
  /* Assume we don't have rtti */
  if (this == item)
    return 1;
  if (item->type() != FUNC_ITEM)
    return 0;
  Item_func *item_func=(Item_func*) item;
  if (arg_count != item_func->arg_count ||
      func_name() != item_func->func_name())
    return 0;
  for (uint i=0; i < arg_count ; i++)
419
    if (!args[i]->eq(item_func->args[i], binary_cmp))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
420 421 422 423
      return 0;
  return 1;
}

424

425
Field *Item_func::tmp_table_field(TABLE *table)
426
{
427 428
  Field *field;
  LINT_INIT(field);
429

430
  switch (result_type()) {
431 432
  case INT_RESULT:
    if (max_length > 11)
433
      field= new Field_longlong(max_length, maybe_null, name, unsigned_flag);
434
    else
435
      field= new Field_long(max_length, maybe_null, name, unsigned_flag);
436 437
    break;
  case REAL_RESULT:
438
    field= new Field_double(max_length, maybe_null, name, decimals);
439 440
    break;
  case STRING_RESULT:
441
    return make_string_field(table);
442
    break;
443
  case DECIMAL_RESULT:
444 445 446 447
    field= new Field_new_decimal(my_decimal_precision_to_length(decimal_precision(),
                                                                decimals,
                                                                unsigned_flag),
                                 maybe_null, name, decimals, unsigned_flag);
448
    break;
449
  case ROW_RESULT:
450
  default:
451
    // This case should never be chosen
452
    DBUG_ASSERT(0);
453
    field= 0;
454
    break;
455
  }
456 457 458
  if (field)
    field->init(table);
  return field;
459 460
}

461

462
bool Item_func::is_expensive_processor(byte *arg)
463
{
464
  return is_expensive();
465 466 467
}


468 469 470 471 472 473 474
my_decimal *Item_func::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed);
  int2my_decimal(E_DEC_FATAL_ERROR, val_int(), unsigned_flag, decimal_value);
  return decimal_value;
}

475

bk@work.mysql.com's avatar
bk@work.mysql.com committed
476 477
String *Item_real_func::val_str(String *str)
{
478
  DBUG_ASSERT(fixed == 1);
479
  double nr= val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
480 481
  if (null_value)
    return 0; /* purecov: inspected */
482
  str->set_real(nr,decimals, &my_charset_bin);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
483 484 485 486
  return str;
}


487 488 489 490 491 492 493 494 495 496 497
my_decimal *Item_real_func::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed);
  double nr= val_real();
  if (null_value)
    return 0; /* purecov: inspected */
  double2my_decimal(E_DEC_FATAL_ERROR, nr, decimal_value);
  return decimal_value;
}


498
void Item_func::fix_num_length_and_dec()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
499
{
500
  uint fl_length= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
501
  decimals=0;
502
  for (uint i=0 ; i < arg_count ; i++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
503 504
  {
    set_if_bigger(decimals,args[i]->decimals);
505 506
    set_if_bigger(fl_length, args[i]->max_length);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
507
  max_length=float_length(decimals);
508 509 510 511
  if (fl_length > max_length)
  {
    decimals= NOT_FIXED_DEC;
    max_length= float_length(NOT_FIXED_DEC);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
512
  }
513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529
}


void Item_func_numhybrid::fix_num_length_and_dec()
{}


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

  SYNOPSIS
    Item_func::count_decimal_length()
*/

void Item_func::count_decimal_length()
{
530
  int max_int_part= 0;
531
  decimals= 0;
532
  unsigned_flag= 1;
533
  for (uint i=0 ; i < arg_count ; i++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
534
  {
535
    set_if_bigger(decimals, args[i]->decimals);
536 537
    set_if_bigger(max_int_part, args[i]->decimal_int_part());
    set_if_smaller(unsigned_flag, args[i]->unsigned_flag);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
538
  }
539 540 541
  int precision= min(max_int_part + decimals, DECIMAL_MAX_PRECISION);
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
542 543 544
}


545 546 547 548 549 550 551 552
/*
  Set max_length of if it is maximum length of its arguments

  SYNOPSIS
    Item_func::count_only_length()
*/

void Item_func::count_only_length()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
553
{
554
  max_length= 0;
555
  unsigned_flag= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
556
  for (uint i=0 ; i < arg_count ; i++)
557
  {
558
    set_if_bigger(max_length, args[i]->max_length);
559 560
    set_if_bigger(unsigned_flag, args[i]->unsigned_flag);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
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

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

  SYNOPSIS
    Item_func::count_real_length()
*/

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



599 600 601 602 603 604 605 606 607 608
void Item_func::signal_divide_by_null()
{
  THD *thd= current_thd;
  if (thd->variables.sql_mode & MODE_ERROR_FOR_DIVISION_BY_ZERO)
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_DIVISION_BY_ZERO,
                 ER(ER_DIVISION_BY_ZERO));
  null_value= 1;
}


609
Item *Item_func::get_tmp_table_item(THD *thd)
610
{
611
  if (!with_sum_func && !const_item() && functype() != SUSERVAR_FUNC)
612
    return new Item_field(result_field);
613
  return copy_or_same(thd);
614 615
}

bk@work.mysql.com's avatar
bk@work.mysql.com committed
616 617
String *Item_int_func::val_str(String *str)
{
618
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
619 620 621
  longlong nr=val_int();
  if (null_value)
    return 0;
622
  str->set_int(nr, unsigned_flag, &my_charset_bin);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
623 624 625
  return str;
}

626

627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
void Item_func_connection_id::fix_length_and_dec()
{
  Item_int_func::fix_length_and_dec();
  max_length= 10;
}


bool Item_func_connection_id::fix_fields(THD *thd, Item **ref)
{
  if (Item_int_func::fix_fields(thd, ref))
    return TRUE;

  /*
    To replicate CONNECTION_ID() properly we should use
    pseudo_thread_id on slave, which contains the value of thread_id
    on master.
  */
  value= ((thd->slave_thread) ?
          thd->variables.pseudo_thread_id :
          thd->thread_id);

  return FALSE;
}


652
/*
653 654
  Check arguments here to determine result's type for a numeric
  function of two arguments.
655 656 657

  SYNOPSIS
    Item_num_op::find_num_type()
658
*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
659 660 661

void Item_num_op::find_num_type(void)
{
662 663 664 665 666 667 668 669
  DBUG_ENTER("Item_num_op::find_num_type");
  DBUG_PRINT("info", ("name %s", func_name()));
  DBUG_ASSERT(arg_count == 2);
  Item_result r0= args[0]->result_type();
  Item_result r1= args[1]->result_type();

  if (r0 == REAL_RESULT || r1 == REAL_RESULT ||
      r0 == STRING_RESULT || r1 ==STRING_RESULT)
670
  {
671 672 673 674 675 676 677 678 679
    count_real_length();
    max_length= float_length(decimals);
    hybrid_type= REAL_RESULT;
  }
  else if (r0 == DECIMAL_RESULT || r1 == DECIMAL_RESULT)
  {
    hybrid_type= DECIMAL_RESULT;
    result_precision();
  }
680
  else
681
  {
682
    DBUG_ASSERT(r0 == INT_RESULT && r1 == INT_RESULT);
683
    decimals= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
684
    hybrid_type=INT_RESULT;
685
    result_precision();
686
  }
687 688 689 690 691 692
  DBUG_PRINT("info", ("Type: %s",
             (hybrid_type == REAL_RESULT ? "REAL_RESULT" :
              hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
              hybrid_type == INT_RESULT ? "INT_RESULT" :
              "--ILLEGAL!!!--")));
  DBUG_VOID_RETURN;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
693 694
}

695 696

/*
697 698 699
  Set result type for a numeric function of one argument
  (can be also used by a numeric function of many arguments, if the result
  type depends only on the first argument)
700 701 702 703

  SYNOPSIS
    Item_func_num1::find_num_type()
*/
704

705 706 707 708
void Item_func_num1::find_num_type()
{
  DBUG_ENTER("Item_func_num1::find_num_type");
  DBUG_PRINT("info", ("name %s", func_name()));
709
  switch (hybrid_type= args[0]->result_type()) {
710
  case INT_RESULT:
711
    unsigned_flag= args[0]->unsigned_flag;
712 713 714 715 716 717 718 719 720 721
    break;
  case STRING_RESULT:
  case REAL_RESULT:
    hybrid_type= REAL_RESULT;
    max_length= float_length(decimals);
    break;
  case DECIMAL_RESULT:
    break;
  default:
    DBUG_ASSERT(0);
722
  }
723 724 725 726 727 728
  DBUG_PRINT("info", ("Type: %s",
                      (hybrid_type == REAL_RESULT ? "REAL_RESULT" :
                       hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
                       hybrid_type == INT_RESULT ? "INT_RESULT" :
                       "--ILLEGAL!!!--")));
  DBUG_VOID_RETURN;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
729 730
}

731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746

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


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


String *Item_func_numhybrid::val_str(String *str)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
747
{
748
  DBUG_ASSERT(fixed == 1);
749
  switch (hybrid_type) {
750 751 752 753
  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    if (!(val= decimal_op(&decimal_value)))
754
      return 0;                                 // null is set
755 756 757 758 759 760 761
    my_decimal_round(E_DEC_FATAL_ERROR, val, decimals, FALSE, val);
    my_decimal2string(E_DEC_FATAL_ERROR, val, 0, 0, 0, str);
    break;
  }
  case INT_RESULT:
  {
    longlong nr= int_op();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
762 763
    if (null_value)
      return 0; /* purecov: inspected */
764
    str->set_int(nr, unsigned_flag, &my_charset_bin);
765
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
766
  }
767
  case REAL_RESULT:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
768
  {
769
    double nr= real_op();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
770 771
    if (null_value)
      return 0; /* purecov: inspected */
772
    str->set_real(nr,decimals,&my_charset_bin);
773 774
    break;
  }
775 776
  case STRING_RESULT:
    return str_op(&str_value);
777 778
  default:
    DBUG_ASSERT(0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
779 780 781 782 783
  }
  return str;
}


784 785 786
double Item_func_numhybrid::val_real()
{
  DBUG_ASSERT(fixed == 1);
787
  switch (hybrid_type) {
788 789 790 791
  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    double result;
792 793
    if (!(val= decimal_op(&decimal_value)))
      return 0.0;                               // null is set
794 795 796 797 798 799 800
    my_decimal2double(E_DEC_FATAL_ERROR, val, &result);
    return result;
  }
  case INT_RESULT:
    return (double)int_op();
  case REAL_RESULT:
    return real_op();
801 802 803 804 805 806 807 808
  case STRING_RESULT:
  {
    char *end_not_used;
    int err_not_used;
    String *res= str_op(&str_value);
    return (res ? my_strntod(res->charset(), (char*) res->ptr(), res->length(),
			     &end_not_used, &err_not_used) : 0.0);
  }
809 810 811 812 813 814 815 816 817 818
  default:
    DBUG_ASSERT(0);
  }
  return 0.0;
}


longlong Item_func_numhybrid::val_int()
{
  DBUG_ASSERT(fixed == 1);
819
  switch (hybrid_type) {
820 821 822 823
  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    if (!(val= decimal_op(&decimal_value)))
824
      return 0;                                 // null is set
825 826 827 828 829 830 831
    longlong result;
    my_decimal2int(E_DEC_FATAL_ERROR, val, unsigned_flag, &result);
    return result;
  }
  case INT_RESULT:
    return int_op();
  case REAL_RESULT:
832
    return (longlong) rint(real_op());
833 834 835
  case STRING_RESULT:
  {
    int err_not_used;
andrey@lmy004's avatar
andrey@lmy004 committed
836 837 838 839
    String *res;
    if (!(res= str_op(&str_value)))
      return 0;

840
    char *end= (char*) res->ptr() + res->length();
841
    CHARSET_INFO *cs= str_value.charset();
andrey@lmy004's avatar
andrey@lmy004 committed
842
    return (*(cs->cset->strtoll10))(cs, res->ptr(), &end, &err_not_used);
843
  }
844 845 846 847 848 849 850 851 852 853 854
  default:
    DBUG_ASSERT(0);
  }
  return 0;
}


my_decimal *Item_func_numhybrid::val_decimal(my_decimal *decimal_value)
{
  my_decimal *val= decimal_value;
  DBUG_ASSERT(fixed == 1);
855
  switch (hybrid_type) {
856 857 858 859 860 861 862 863 864 865 866
  case DECIMAL_RESULT:
    val= decimal_op(decimal_value);
    break;
  case INT_RESULT:
  {
    longlong result= int_op();
    int2my_decimal(E_DEC_FATAL_ERROR, result, unsigned_flag, decimal_value);
    break;
  }
  case REAL_RESULT:
  {
867
    double result= (double)real_op();
868 869 870 871
    double2my_decimal(E_DEC_FATAL_ERROR, result, decimal_value);
    break;
  }
  case STRING_RESULT:
872
  {
andrey@lmy004's avatar
andrey@lmy004 committed
873 874 875 876
    String *res;
    if (!(res= str_op(&str_value)))
      return NULL;

877 878 879 880
    str2my_decimal(E_DEC_FATAL_ERROR, (char*) res->ptr(),
                   res->length(), res->charset(), decimal_value);
    break;
  }  
881 882 883 884 885 886 887 888
  case ROW_RESULT:
  default:
    DBUG_ASSERT(0);
  }
  return val;
}


889 890
void Item_func_signed::print(String *str)
{
891
  str->append(STRING_WITH_LEN("cast("));
892
  args[0]->print(str);
893
  str->append(STRING_WITH_LEN(" as signed)"));
894 895 896 897

}


898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
longlong Item_func_signed::val_int_from_str(int *error)
{
  char buff[MAX_FIELD_WIDTH], *end;
  String tmp(buff,sizeof(buff), &my_charset_bin), *res;
  longlong value;

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

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


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

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

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


950 951
void Item_func_unsigned::print(String *str)
{
952
  str->append(STRING_WITH_LEN("cast("));
953
  args[0]->print(str);
954
  str->append(STRING_WITH_LEN(" as unsigned)"));
955 956 957 958

}


959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979
longlong Item_func_unsigned::val_int()
{
  longlong value;
  int error;

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

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


980 981 982
String *Item_decimal_typecast::val_str(String *str)
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
983 984
  if (null_value)
    return NULL;
985 986 987 988 989 990 991 992 993
  my_decimal2string(E_DEC_FATAL_ERROR, &tmp_buf, 0, 0, 0, str);
  return str;
}


double Item_decimal_typecast::val_real()
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
  double res;
994 995
  if (null_value)
    return 0.0;
996 997 998 999 1000 1001 1002 1003 1004
  my_decimal2double(E_DEC_FATAL_ERROR, tmp, &res);
  return res;
}


longlong Item_decimal_typecast::val_int()
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
  longlong res;
1005 1006
  if (null_value)
    return 0;
1007 1008 1009 1010 1011 1012 1013 1014
  my_decimal2int(E_DEC_FATAL_ERROR, tmp, unsigned_flag, &res);
  return res;
}


my_decimal *Item_decimal_typecast::val_decimal(my_decimal *dec)
{
  my_decimal tmp_buf, *tmp= args[0]->val_decimal(&tmp_buf);
1015
  bool sign;
1016 1017
  if ((null_value= args[0]->null_value))
    return NULL;
1018
  my_decimal_round(E_DEC_FATAL_ERROR, tmp, decimals, FALSE, dec);
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
  sign= dec->sign();
  if (unsigned_flag)
  {
    if (sign)
    {
      my_decimal_set_zero(dec);
      goto err;
    }
  }
  if (max_length - 2 - decimals < (uint) my_decimal_intg(dec))
  {
    max_my_decimal(dec, max_length - 2, decimals);
    dec->sign(sign);
    goto err;
  }
  return dec;

err:
  push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
                      ER_WARN_DATA_OUT_OF_RANGE,
                      ER(ER_WARN_DATA_OUT_OF_RANGE),
                      name, 1);
1041 1042 1043 1044
  return dec;
}


1045 1046
void Item_decimal_typecast::print(String *str)
{
1047
  str->append(STRING_WITH_LEN("cast("));
1048
  args[0]->print(str);
1049
  str->append(STRING_WITH_LEN(" as decimal)"));
1050 1051 1052
}


1053
double Item_func_plus::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1054
{
1055
  double value= args[0]->val_real() + args[1]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1056 1057 1058 1059 1060
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0;
  return value;
}

1061 1062

longlong Item_func_plus::int_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1063
{
1064 1065 1066 1067 1068 1069 1070
  longlong value=args[0]->val_int()+args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
}


1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
/*
  Calculate plus of two decimail's

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

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

1083 1084
my_decimal *Item_func_plus::decimal_op(my_decimal *decimal_value)
{
1085 1086 1087
  my_decimal value1, *val1;
  my_decimal value2, *val2;
  val1= args[0]->val_decimal(&value1);
1088 1089
  if ((null_value= args[0]->null_value))
    return 0;
1090
  val2= args[1]->val_decimal(&value2);
1091
  if (!(null_value= (args[1]->null_value ||
1092 1093
                     (my_decimal_add(E_DEC_FATAL_ERROR, decimal_value, val1,
                                     val2) > 3))))
1094 1095
    return decimal_value;
  return 0;
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
}

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

  SYNOPSIS
    Item_func_additive_op::result_precision()
*/
void Item_func_additive_op::result_precision()
{
  decimals= max(args[0]->decimals, args[1]->decimals);
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
  int max_int_part= max(args[0]->decimal_precision() - args[0]->decimals,
                        args[1]->decimal_precision() - args[1]->decimals);
  int precision= min(max_int_part + 1 + decimals, DECIMAL_MAX_PRECISION);

  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1118 1119
}

1120 1121 1122 1123 1124 1125 1126 1127 1128 1129

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

void Item_func_minus::fix_length_and_dec()
{
  Item_num_op::fix_length_and_dec();
  if (unsigned_flag &&
1130
      (current_thd->variables.sql_mode & MODE_NO_UNSIGNED_SUBTRACTION))
1131 1132 1133 1134
    unsigned_flag=0;
}


1135
double Item_func_minus::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1136
{
1137
  double value= args[0]->val_real() - args[1]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1138 1139 1140 1141 1142
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0;
  return value;
}

1143 1144

longlong Item_func_minus::int_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1145
{
1146 1147 1148 1149
  longlong value=args[0]->val_int() - args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1150 1151
}

1152

1153 1154
/* See Item_func_plus::decimal_op for comments */

1155 1156
my_decimal *Item_func_minus::decimal_op(my_decimal *decimal_value)
{
1157 1158 1159 1160
  my_decimal value1, *val1;
  my_decimal value2, *val2= 

  val1= args[0]->val_decimal(&value1);
1161 1162
  if ((null_value= args[0]->null_value))
    return 0;
1163
  val2= args[1]->val_decimal(&value2);
1164
  if (!(null_value= (args[1]->null_value ||
1165 1166
                     (my_decimal_sub(E_DEC_FATAL_ERROR, decimal_value, val1,
                                     val2) > 3))))
1167 1168
    return decimal_value;
  return 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1169 1170
}

1171

1172
double Item_func_mul::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1173
{
1174
  DBUG_ASSERT(fixed == 1);
1175
  double value= args[0]->val_real() * args[1]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1176
  if ((null_value=args[0]->null_value || args[1]->null_value))
1177
    return 0.0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1178 1179 1180
  return value;
}

1181 1182

longlong Item_func_mul::int_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1183
{
1184
  DBUG_ASSERT(fixed == 1);
1185 1186 1187 1188
  longlong value=args[0]->val_int()*args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1189 1190 1191
}


1192 1193
/* See Item_func_plus::decimal_op for comments */

1194 1195
my_decimal *Item_func_mul::decimal_op(my_decimal *decimal_value)
{
1196 1197 1198
  my_decimal value1, *val1;
  my_decimal value2, *val2;
  val1= args[0]->val_decimal(&value1);
1199 1200
  if ((null_value= args[0]->null_value))
    return 0;
1201
  val2= args[1]->val_decimal(&value2);
1202
  if (!(null_value= (args[1]->null_value ||
1203 1204
                     (my_decimal_mul(E_DEC_FATAL_ERROR, decimal_value, val1,
                                    val2) > 3))))
1205 1206
    return decimal_value;
  return 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1207 1208 1209
}


1210 1211
void Item_func_mul::result_precision()
{
1212 1213 1214 1215 1216 1217 1218 1219 1220
  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  decimals= min(args[0]->decimals + args[1]->decimals, DECIMAL_MAX_SCALE);
  int precision= min(args[0]->decimal_precision() + args[1]->decimal_precision(),
                     DECIMAL_MAX_PRECISION);
  max_length= my_decimal_precision_to_length(precision, decimals,unsigned_flag);
1221 1222 1223 1224
}


double Item_func_div::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1225
{
1226
  DBUG_ASSERT(fixed == 1);
1227 1228
  double value= args[0]->val_real();
  double val2= args[1]->val_real();
1229 1230 1231 1232 1233
  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0.0;
  if (val2 == 0.0)
  {
    signal_divide_by_null();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1234
    return 0.0;
1235
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1236 1237 1238
  return value/val2;
}

1239

1240
my_decimal *Item_func_div::decimal_op(my_decimal *decimal_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1241
{
1242 1243
  my_decimal value1, *val1;
  my_decimal value2, *val2;
1244
  int err;
1245 1246

  val1= args[0]->val_decimal(&value1);
1247 1248
  if ((null_value= args[0]->null_value))
    return 0;
1249
  val2= args[1]->val_decimal(&value2);
1250 1251
  if ((null_value= args[1]->null_value))
    return 0;
1252 1253 1254 1255 1256 1257
  if ((err= my_decimal_div(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
                           val1, val2, prec_increment)) > 3)
  {
    if (err == E_DEC_DIV_ZERO)
      signal_divide_by_null();
    null_value= 1;
1258
    return 0;
1259
  }
1260
  return decimal_value;
1261 1262 1263 1264 1265
}


void Item_func_div::result_precision()
{
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
  uint precision=min(args[0]->decimal_precision() + prec_increment,
                     DECIMAL_MAX_PRECISION);
  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  decimals= min(args[0]->decimals + prec_increment, DECIMAL_MAX_SCALE);
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1276 1277
}

1278

bk@work.mysql.com's avatar
bk@work.mysql.com committed
1279 1280
void Item_func_div::fix_length_and_dec()
{
1281
  DBUG_ENTER("Item_func_div::fix_length_and_dec");
1282
  prec_increment= current_thd->variables.div_precincrement;
1283
  Item_num_op::fix_length_and_dec();
1284
  switch(hybrid_type) {
1285 1286
  case REAL_RESULT:
  {
1287
    decimals=max(args[0]->decimals,args[1]->decimals)+prec_increment;
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
    set_if_smaller(decimals, NOT_FIXED_DEC);
    max_length=args[0]->max_length - args[0]->decimals + decimals;
    uint tmp=float_length(decimals);
    set_if_smaller(max_length,tmp);
    break;
  }
  case INT_RESULT:
    hybrid_type= DECIMAL_RESULT;
    DBUG_PRINT("info", ("Type changed: DECIMAL_RESULT"));
    result_precision();
    break;
  case DECIMAL_RESULT:
    result_precision();
    break;
  default:
    DBUG_ASSERT(0);
  }
  maybe_null= 1; // devision by zero
  DBUG_VOID_RETURN;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1307 1308
}

1309 1310 1311 1312

/* Integer division */
longlong Item_func_int_div::val_int()
{
1313
  DBUG_ASSERT(fixed == 1);
1314 1315
  longlong value=args[0]->val_int();
  longlong val2=args[1]->val_int();
1316
  if ((null_value= (args[0]->null_value || args[1]->null_value)))
1317 1318 1319 1320
    return 0;
  if (val2 == 0)
  {
    signal_divide_by_null();
1321
    return 0;
1322
  }
1323 1324 1325
  return (unsigned_flag ?
	  (ulonglong) value / (ulonglong) val2 :
	  value / val2);
1326 1327 1328 1329 1330 1331 1332
}


void Item_func_int_div::fix_length_and_dec()
{
  max_length=args[0]->max_length - args[0]->decimals;
  maybe_null=1;
1333
  unsigned_flag=args[0]->unsigned_flag | args[1]->unsigned_flag;
1334 1335 1336
}


1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
longlong Item_func_mod::int_op()
{
  DBUG_ASSERT(fixed == 1);
  longlong value=  args[0]->val_int();
  longlong val2= args[1]->val_int();
  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0; /* purecov: inspected */
  if (val2 == 0)
  {
    signal_divide_by_null();
    return 0;
  }
  return value % val2;
}

double Item_func_mod::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1353
{
1354
  DBUG_ASSERT(fixed == 1);
1355 1356
  double value= args[0]->val_real();
  double val2=  args[1]->val_real();
1357
  if ((null_value= args[0]->null_value || args[1]->null_value))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1358
    return 0.0; /* purecov: inspected */
1359 1360 1361 1362 1363
  if (val2 == 0.0)
  {
    signal_divide_by_null();
    return 0.0;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1364 1365 1366
  return fmod(value,val2);
}

1367 1368

my_decimal *Item_func_mod::decimal_op(my_decimal *decimal_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1369
{
1370 1371 1372 1373
  my_decimal value1, *val1;
  my_decimal value2, *val2;

  val1= args[0]->val_decimal(&value1);
1374 1375
  if ((null_value= args[0]->null_value))
    return 0;
1376
  val2= args[1]->val_decimal(&value2);
1377 1378 1379
  if ((null_value= args[1]->null_value))
    return 0;
  switch (my_decimal_mod(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
1380
                         val1, val2)) {
1381 1382 1383 1384
  case E_DEC_TRUNCATED:
  case E_DEC_OK:
    return decimal_value;
  case E_DEC_DIV_ZERO:
1385
    signal_divide_by_null();
1386
  default:
1387
    null_value= 1;
1388 1389
    return 0;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1390 1391
}

1392 1393

void Item_func_mod::result_precision()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1394
{
1395 1396
  decimals= max(args[0]->decimals, args[1]->decimals);
  max_length= max(args[0]->max_length, args[1]->max_length);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1397 1398 1399 1400 1401
}


void Item_func_mod::fix_length_and_dec()
{
1402
  Item_num_op::fix_length_and_dec();
1403
  maybe_null= 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1404 1405 1406
}


1407
double Item_func_neg::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1408
{
1409
  double value= args[0]->val_real();
1410
  null_value= args[0]->null_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1411 1412 1413
  return -value;
}

1414

1415
longlong Item_func_neg::int_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1416
{
1417 1418
  longlong value= args[0]->val_int();
  null_value= args[0]->null_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1419 1420 1421
  return -value;
}

1422

1423
my_decimal *Item_func_neg::decimal_op(my_decimal *decimal_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1424
{
1425 1426 1427 1428 1429
  my_decimal val, *value= args[0]->val_decimal(&val);
  if (!(null_value= args[0]->null_value))
  {
    my_decimal2decimal(value, decimal_value);
    my_decimal_neg(decimal_value);
1430
    return decimal_value;
1431
  }
1432
  return 0;
1433 1434
}

1435

1436
void Item_func_neg::fix_num_length_and_dec()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1437
{
1438 1439 1440
  decimals= args[0]->decimals;
  /* 1 add because sign can appear */
  max_length= args[0]->max_length + 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1441 1442
}

1443

1444
void Item_func_neg::fix_length_and_dec()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1445
{
1446
  DBUG_ENTER("Item_func_neg::fix_length_and_dec");
1447
  Item_func_num1::fix_length_and_dec();
1448 1449 1450 1451

  /*
    If this is in integer context keep the context as integer if possible
    (This is how multiplication and other integer functions works)
1452 1453
    Use val() to get value as arg_type doesn't mean that item is
    Item_int or Item_real due to existence of Item_param.
1454
  */
1455 1456
  if (hybrid_type == INT_RESULT &&
      args[0]->type() == INT_ITEM &&
1457
      ((ulonglong) args[0]->val_int() >= (ulonglong) LONGLONG_MIN))
1458 1459
  {
    /*
1460 1461
      Ensure that result is converted to DECIMAL, as longlong can't hold
      the negated number
1462
    */
1463 1464
    hybrid_type= DECIMAL_RESULT;
    DBUG_PRINT("info", ("Type changed: DECIMAL_RESULT"));
1465
  }
1466
  unsigned_flag= 0;
1467
  DBUG_VOID_RETURN;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1468 1469
}

1470

1471
double Item_func_abs::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1472
{
1473
  double value= args[0]->val_real();
1474
  null_value= args[0]->null_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1475 1476 1477
  return fabs(value);
}

1478

1479
longlong Item_func_abs::int_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1480
{
1481 1482
  longlong value= args[0]->val_int();
  null_value= args[0]->null_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1483 1484 1485
  return value >= 0 ? value : -value;
}

1486

1487
my_decimal *Item_func_abs::decimal_op(my_decimal *decimal_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1488
{
1489 1490
  my_decimal val, *value= args[0]->val_decimal(&val);
  if (!(null_value= args[0]->null_value))
1491
  {
1492 1493 1494
    my_decimal2decimal(value, decimal_value);
    if (decimal_value->sign())
      my_decimal_neg(decimal_value);
1495
    return decimal_value;
1496
  }
1497
  return 0;
1498 1499 1500 1501 1502 1503
}


void Item_func_abs::fix_length_and_dec()
{
  Item_func_num1::fix_length_and_dec();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1504 1505
}

1506

1507
/* Gateway to natural LOG function */
1508
double Item_func_ln::val_real()
1509
{
1510
  DBUG_ASSERT(fixed == 1);
1511
  double value= args[0]->val_real();
1512
  if ((null_value= args[0]->null_value))
1513
    return 0.0;
1514
  if (value <= 0.0)
1515 1516
  {
    signal_divide_by_null();
1517
    return 0.0;
1518
  }
1519 1520 1521 1522 1523 1524 1525 1526
  return log(value);
}

/* 
 Extended but so slower LOG function
 We have to check if all values are > zero and first one is not one
 as these are the cases then result is not a number.
*/ 
1527
double Item_func_log::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1528
{
1529
  DBUG_ASSERT(fixed == 1);
1530
  double value= args[0]->val_real();
1531
  if ((null_value= args[0]->null_value))
1532
    return 0.0;
1533
  if (value <= 0.0)
1534 1535 1536 1537
  {
    signal_divide_by_null();
    return 0.0;
  }
1538 1539
  if (arg_count == 2)
  {
1540
    double value2= args[1]->val_real();
1541
    if ((null_value= args[1]->null_value))
1542
      return 0.0;
1543
    if (value2 <= 0.0 || value == 1.0)
1544 1545 1546 1547
    {
      signal_divide_by_null();
      return 0.0;
    }
1548 1549
    return log(value2) / log(value);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1550 1551 1552
  return log(value);
}

1553
double Item_func_log2::val_real()
1554
{
1555
  DBUG_ASSERT(fixed == 1);
1556
  double value= args[0]->val_real();
1557 1558

  if ((null_value=args[0]->null_value))
1559
    return 0.0;
1560
  if (value <= 0.0)
1561 1562 1563 1564
  {
    signal_divide_by_null();
    return 0.0;
  }
1565
  return log(value) / M_LN2;
1566 1567
}

1568
double Item_func_log10::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1569
{
1570
  DBUG_ASSERT(fixed == 1);
1571
  double value= args[0]->val_real();
1572
  if ((null_value= args[0]->null_value))
1573
    return 0.0;
1574
  if (value <= 0.0)
1575 1576 1577 1578
  {
    signal_divide_by_null();
    return 0.0;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1579 1580 1581
  return log10(value);
}

1582
double Item_func_exp::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1583
{
1584
  DBUG_ASSERT(fixed == 1);
1585
  double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1586 1587 1588 1589 1590
  if ((null_value=args[0]->null_value))
    return 0.0; /* purecov: inspected */
  return exp(value);
}

1591
double Item_func_sqrt::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1592
{
1593
  DBUG_ASSERT(fixed == 1);
1594
  double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1595 1596 1597 1598 1599
  if ((null_value=(args[0]->null_value || value < 0)))
    return 0.0; /* purecov: inspected */
  return sqrt(value);
}

1600
double Item_func_pow::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1601
{
1602
  DBUG_ASSERT(fixed == 1);
1603 1604
  double value= args[0]->val_real();
  double val2= args[1]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1605 1606 1607 1608 1609 1610 1611
  if ((null_value=(args[0]->null_value || args[1]->null_value)))
    return 0.0; /* purecov: inspected */
  return pow(value,val2);
}

// Trigonometric functions

1612
double Item_func_acos::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1613
{
1614
  DBUG_ASSERT(fixed == 1);
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
1615
  // the volatile's for BUG #2338 to calm optimizer down (because of gcc's bug)
1616
  volatile double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1617 1618 1619 1620 1621
  if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
    return 0.0;
  return fix_result(acos(value));
}

1622
double Item_func_asin::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1623
{
1624
  DBUG_ASSERT(fixed == 1);
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
1625
  // the volatile's for BUG #2338 to calm optimizer down (because of gcc's bug)
1626
  volatile double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1627 1628 1629 1630 1631
  if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
    return 0.0;
  return fix_result(asin(value));
}

1632
double Item_func_atan::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1633
{
1634
  DBUG_ASSERT(fixed == 1);
1635
  double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1636 1637 1638 1639
  if ((null_value=args[0]->null_value))
    return 0.0;
  if (arg_count == 2)
  {
1640
    double val2= args[1]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1641 1642 1643 1644 1645 1646 1647
    if ((null_value=args[1]->null_value))
      return 0.0;
    return fix_result(atan2(value,val2));
  }
  return fix_result(atan(value));
}

1648
double Item_func_cos::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1649
{
1650
  DBUG_ASSERT(fixed == 1);
1651
  double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1652 1653 1654 1655 1656
  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(cos(value));
}

1657
double Item_func_sin::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1658
{
1659
  DBUG_ASSERT(fixed == 1);
1660
  double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1661 1662 1663 1664 1665
  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(sin(value));
}

1666
double Item_func_tan::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1667
{
1668
  DBUG_ASSERT(fixed == 1);
1669
  double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(tan(value));
}


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


longlong Item_func_shift_left::val_int()
{
1681
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
  uint shift;
  ulonglong res= ((ulonglong) args[0]->val_int() <<
		  (shift=(uint) args[1]->val_int()));
  if (args[0]->null_value || args[1]->null_value)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (shift < sizeof(longlong)*8 ? (longlong) res : LL(0));
}

longlong Item_func_shift_right::val_int()
{
1696
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
  uint shift;
  ulonglong res= (ulonglong) args[0]->val_int() >>
    (shift=(uint) args[1]->val_int());
  if (args[0]->null_value || args[1]->null_value)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (shift < sizeof(longlong)*8 ? (longlong) res : LL(0));
}


longlong Item_func_bit_neg::val_int()
{
1712
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
  ulonglong res= (ulonglong) args[0]->val_int();
  if ((null_value=args[0]->null_value))
    return 0;
  return ~res;
}


// Conversion functions

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

1730
void Item_func_int_val::fix_num_length_and_dec()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1731
{
1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783
  max_length= args[0]->max_length - (args[0]->decimals ?
                                     args[0]->decimals + 1 :
                                     0) + 2;
  uint tmp= float_length(decimals);
  set_if_smaller(max_length,tmp);
  decimals= 0;
}


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

  DBUG_VOID_RETURN;
}


longlong Item_func_ceiling::int_op()
{
1784 1785 1786 1787 1788 1789 1790 1791 1792
  longlong result;
  switch (args[0]->result_type()) {
  case INT_RESULT:
    result= args[0]->val_int();
    null_value= args[0]->null_value;
    break;
  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec;
1793
    if ((dec= Item_func_ceiling::decimal_op(&dec_buf)))
1794 1795 1796 1797 1798 1799
      my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
    else
      result= 0;
    break;
  }
  default:
1800
    result= (longlong)Item_func_ceiling::real_op();
1801 1802
  };
  return result;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1803 1804
}

1805 1806

double Item_func_ceiling::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1807
{
1808 1809 1810 1811
  /*
    the volatile's for BUG #3051 to calm optimizer down (because of gcc's
    bug)
  */
1812
  volatile double value= args[0]->val_real();
1813 1814 1815 1816 1817 1818
  null_value= args[0]->null_value;
  return ceil(value);
}


my_decimal *Item_func_ceiling::decimal_op(my_decimal *decimal_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1819
{
1820
  my_decimal val, *value= args[0]->val_decimal(&val);
1821 1822 1823 1824 1825
  if (!(null_value= (args[0]->null_value ||
                     my_decimal_ceiling(E_DEC_FATAL_ERROR, value,
                                        decimal_value) > 1)))
    return decimal_value;
  return 0;
1826 1827 1828 1829 1830
}


longlong Item_func_floor::int_op()
{
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
  longlong result;
  switch (args[0]->result_type()) {
  case INT_RESULT:
    result= args[0]->val_int();
    null_value= args[0]->null_value;
    break;
  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec;
    if ((dec= Item_func_floor::decimal_op(&dec_buf)))
      my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
    else
      result= 0;
    break;
  }
  default:
    result= (longlong)Item_func_floor::real_op();
  };
  return result;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1850 1851
}

1852 1853

double Item_func_floor::real_op()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1854
{
1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
  /*
    the volatile's for BUG #3051 to calm optimizer down (because of gcc's
    bug)
  */
  volatile double value= args[0]->val_real();
  null_value= args[0]->null_value;
  return floor(value);
}


my_decimal *Item_func_floor::decimal_op(my_decimal *decimal_value)
{
  my_decimal val, *value= args[0]->val_decimal(&val);
1868 1869 1870 1871 1872
  if (!(null_value= (args[0]->null_value ||
                     my_decimal_floor(E_DEC_FATAL_ERROR, value,
                                      decimal_value) > 1)))
    return decimal_value;
  return 0;
1873 1874 1875
}


1876
void Item_func_round::fix_length_and_dec()
1877
{
1878 1879
  unsigned_flag= args[0]->unsigned_flag;
  if (!args[1]->const_item())
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1880
  {
1881 1882 1883 1884 1885 1886
    max_length= args[0]->max_length;
    decimals= args[0]->decimals;
    hybrid_type= REAL_RESULT;
    return;
  }
  
1887
  int decimals_to_set= max((int)args[1]->val_int(), 0);
1888 1889 1890 1891 1892 1893 1894 1895
  if (args[0]->decimals == NOT_FIXED_DEC)
  {
    max_length= args[0]->max_length;
    decimals= min(decimals_to_set, NOT_FIXED_DEC);
    hybrid_type= REAL_RESULT;
    return;
  }
  
1896
  switch (args[0]->result_type()) {
1897 1898 1899 1900 1901 1902 1903
  case REAL_RESULT:
  case STRING_RESULT:
    hybrid_type= REAL_RESULT;
    decimals= min(decimals_to_set, NOT_FIXED_DEC);
    max_length= float_length(decimals);
    break;
  case INT_RESULT:
1904
    if (!decimals_to_set &&
1905
        (truncate || (args[0]->decimal_precision() < DECIMAL_LONGLONG_DIGITS)))
1906
    {
1907 1908
      int length_can_increase= test(!truncate && (args[1]->val_int() < 0));
      max_length= args[0]->max_length + length_can_increase;
1909 1910 1911 1912 1913
      /* Here we can keep INT_RESULT */
      hybrid_type= INT_RESULT;
      decimals= 0;
      break;
    }
1914
    /* fall through */
1915 1916 1917 1918 1919
  case DECIMAL_RESULT:
  {
    hybrid_type= DECIMAL_RESULT;
    int decimals_delta= args[0]->decimals - decimals_to_set;
    int precision= args[0]->decimal_precision();
1920 1921 1922 1923
    int length_increase= ((decimals_delta <= 0) || truncate) ? 0:1;

    precision-= decimals_delta - length_increase;
    decimals= decimals_to_set;
1924
    max_length= my_decimal_precision_to_length(precision, decimals,
1925
                                               unsigned_flag);
1926 1927 1928 1929
    break;
  }
  default:
    DBUG_ASSERT(0); /* This result type isn't handled */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1930 1931 1932
  }
}

1933
double my_double_round(double value, int dec, bool truncate)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1934
{
1935
  double tmp;
1936
  uint abs_dec= abs(dec);
1937 1938 1939 1940 1941
  /*
    tmp2 is here to avoid return the value with 80 bit precision
    This will fix that the test round(0.1,1) = round(0.1,1) is true
  */
  volatile double tmp2;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1942

1943 1944
  tmp=(abs_dec < array_elements(log_10) ?
       log_10[abs_dec] : pow(10.0,(double) abs_dec));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1945 1946

  if (truncate)
1947 1948
  {
    if (value >= 0)
1949
      tmp2= dec < 0 ? floor(value/tmp)*tmp : floor(value*tmp)/tmp;
1950
    else
1951
      tmp2= dec < 0 ? ceil(value/tmp)*tmp : ceil(value*tmp)/tmp;
1952
  }
1953 1954 1955
  else
    tmp2=dec < 0 ? rint(value/tmp)*tmp : rint(value*tmp)/tmp;
  return tmp2;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1956 1957 1958
}


1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
double Item_func_round::real_op()
{
  double value= args[0]->val_real();
  int dec= (int) args[1]->val_int();

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

  return 0.0;
}


1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
longlong Item_func_round::int_op()
{
  longlong value= args[0]->val_int();
  int dec=(int) args[1]->val_int();
  decimals= 0;
  uint abs_dec;
  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0;
  if (dec >= 0)
    return value; // integer have not digits after point

  abs_dec= -dec;
gunnar@mysql.com's avatar
gunnar@mysql.com committed
1983 1984 1985 1986 1987 1988 1989
  longlong tmp;
  
  if(abs_dec >= array_elements(log_10_int))
    return 0;
  
  tmp= log_10_int[abs_dec];
  
1990 1991 1992
  if (truncate)
  {
    if (unsigned_flag)
gunnar@mysql.com's avatar
gunnar@mysql.com committed
1993
      value= (ulonglong(value)/tmp)*tmp;
1994
    else
gunnar@mysql.com's avatar
gunnar@mysql.com committed
1995
      value= (value/tmp)*tmp;
1996 1997
  }
  else
gunnar@mysql.com's avatar
gunnar@mysql.com committed
1998 1999 2000 2001 2002 2003 2004 2005 2006
  {
    if (unsigned_flag)
      value= ((ulonglong(value)+(tmp>>1))/tmp)*tmp;
    else if ( value >= 0)
      value= ((value+(tmp>>1))/tmp)*tmp;
    else
      value= ((value-(tmp>>1))/tmp)*tmp;
  }
  return value;
2007 2008 2009 2010 2011 2012 2013 2014
}


my_decimal *Item_func_round::decimal_op(my_decimal *decimal_value)
{
  my_decimal val, *value= args[0]->val_decimal(&val);
  int dec=(int) args[1]->val_int();
  if (dec > 0)
2015 2016 2017
  {
    decimals= min(dec, DECIMAL_MAX_SCALE); // to get correct output
  }
2018 2019 2020 2021 2022
  if (!(null_value= (args[0]->null_value || args[1]->null_value ||
                     my_decimal_round(E_DEC_FATAL_ERROR, value, dec, truncate,
                                      decimal_value) > 1)))
    return decimal_value;
  return 0;
2023 2024 2025
}


2026
bool Item_func_rand::fix_fields(THD *thd,Item **ref)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2027
{
2028
  if (Item_real_func::fix_fields(thd, ref))
2029
    return TRUE;
2030
  used_tables_cache|= RAND_TABLE_BIT;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2031 2032
  if (arg_count)
  {					// Only use argument once in query
2033 2034 2035 2036 2037
    if (!args[0]->const_during_execution())
    {
      my_error(ER_WRONG_ARGUMENTS, MYF(0), "RAND");
      return TRUE;
    }
2038
    /*
konstantin@mysql.com's avatar
konstantin@mysql.com committed
2039
      Allocate rand structure once: we must use thd->stmt_arena
2040 2041
      to create rand in proper mem_root if it's a prepared statement or
      stored procedure.
2042 2043 2044

      No need to send a Rand log event if seed was given eg: RAND(seed),
      as it will be replicated in the query as such.
2045 2046
    */
    if (!rand && !(rand= (struct rand_struct*)
konstantin@mysql.com's avatar
konstantin@mysql.com committed
2047
                   thd->stmt_arena->alloc(sizeof(*rand))))
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062
      return TRUE;
    /*
      PARAM_ITEM is returned if we're in statement prepare and consequently
      no placeholder value is set yet.
    */
    if (args[0]->type() != PARAM_ITEM)
    {
      /*
        TODO: do not do reinit 'rand' for every execute of PS/SP if
        args[0] is a constant.
      */
      uint32 tmp= (uint32) args[0]->val_int();
      randominit(rand, (uint32) (tmp*0x10001L+55555555L),
                 (uint32) (tmp*0x10000001L));
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2063
  }
2064
  else
nick@mysql.com's avatar
nick@mysql.com committed
2065
  {
2066 2067 2068 2069 2070
    /*
      Save the seed only the first time RAND() is used in the query
      Once events are forwarded rather than recreated,
      the following can be skipped if inside the slave thread
    */
2071 2072 2073 2074 2075 2076
    if (!thd->rand_used)
    {
      thd->rand_used= 1;
      thd->rand_saved_seed1= thd->rand.seed1;
      thd->rand_saved_seed2= thd->rand.seed2;
    }
2077
    rand= &thd->rand;
nick@mysql.com's avatar
nick@mysql.com committed
2078
  }
2079
  return FALSE;
2080 2081
}

2082 2083 2084 2085 2086 2087
void Item_func_rand::update_used_tables()
{
  Item_real_func::update_used_tables();
  used_tables_cache|= RAND_TABLE_BIT;
}

2088

2089
double Item_func_rand::val_real()
2090
{
2091
  DBUG_ASSERT(fixed == 1);
2092
  return my_rnd(rand);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2093 2094 2095 2096
}

longlong Item_func_sign::val_int()
{
2097
  DBUG_ASSERT(fixed == 1);
2098
  double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2099 2100 2101 2102 2103
  null_value=args[0]->null_value;
  return value < 0.0 ? -1 : (value > 0 ? 1 : 0);
}


2104
double Item_func_units::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2105
{
2106
  DBUG_ASSERT(fixed == 1);
2107
  double value= args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2108 2109 2110 2111 2112 2113 2114 2115
  if ((null_value=args[0]->null_value))
    return 0;
  return value*mul+add;
}


void Item_func_min_max::fix_length_and_dec()
{
2116
  int max_int_part=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2117 2118
  decimals=0;
  max_length=0;
2119
  maybe_null=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2120
  cmp_type=args[0]->result_type();
2121

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2122 2123
  for (uint i=0 ; i < arg_count ; i++)
  {
2124 2125
    set_if_bigger(max_length, args[i]->max_length);
    set_if_bigger(decimals, args[i]->decimals);
2126
    set_if_bigger(max_int_part, args[i]->decimal_int_part());
2127 2128
    if (args[i]->maybe_null)
      maybe_null=1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2129 2130
    cmp_type=item_cmp_type(cmp_type,args[i]->result_type());
  }
bar@bar.mysql.r18.ru's avatar
bar@bar.mysql.r18.ru committed
2131
  if (cmp_type == STRING_RESULT)
2132
    agg_arg_charsets(collation, args, arg_count, MY_COLL_CMP_CONV, 1);
2133 2134 2135
  else if ((cmp_type == DECIMAL_RESULT) || (cmp_type == INT_RESULT))
    max_length= my_decimal_precision_to_length(max_int_part+decimals, decimals,
                                            unsigned_flag);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2136 2137 2138 2139 2140
}


String *Item_func_min_max::val_str(String *str)
{
2141
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2142 2143 2144 2145 2146 2147
  switch (cmp_type) {
  case INT_RESULT:
  {
    longlong nr=val_int();
    if (null_value)
      return 0;
2148
    str->set_int(nr, unsigned_flag, &my_charset_bin);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2149 2150
    return str;
  }
2151 2152 2153 2154 2155 2156 2157 2158
  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec_val= val_decimal(&dec_buf);
    if (null_value)
      return 0;
    my_decimal2string(E_DEC_FATAL_ERROR, dec_val, 0, 0, 0, str);
    return str;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2159 2160
  case REAL_RESULT:
  {
2161
    double nr= val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2162 2163
    if (null_value)
      return 0; /* purecov: inspected */
2164
    str->set_real(nr,decimals,&my_charset_bin);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2165 2166 2167 2168 2169 2170 2171 2172
    return str;
  }
  case STRING_RESULT:
  {
    String *res;
    LINT_INIT(res);
    for (uint i=0; i < arg_count ; i++)
    {
2173
      if (i == 0)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2174 2175 2176 2177 2178 2179 2180
	res=args[i]->val_str(str);
      else
      {
	String *res2;
	res2= args[i]->val_str(res == str ? &tmp_value : str);
	if (res2)
	{
2181
	  int cmp= sortcmp(res,res2,collation.collation);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2182 2183 2184 2185
	  if ((cmp_sign < 0 ? cmp : -cmp) < 0)
	    res=res2;
	}
      }
2186
      if ((null_value= args[i]->null_value))
2187
        return 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2188
    }
2189
    res->set_charset(collation.collation);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2190 2191
    return res;
  }
2192
  case ROW_RESULT:
2193
  default:
2194
    // This case should never be chosen
2195 2196
    DBUG_ASSERT(0);
    return 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2197 2198 2199 2200 2201
  }
  return 0;					// Keep compiler happy
}


2202
double Item_func_min_max::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2203
{
2204
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2205 2206 2207
  double value=0.0;
  for (uint i=0; i < arg_count ; i++)
  {
2208
    if (i == 0)
2209
      value= args[i]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2210 2211
    else
    {
2212
      double tmp= args[i]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2213 2214 2215
      if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
	value=tmp;
    }
2216 2217
    if ((null_value= args[i]->null_value))
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2218 2219 2220 2221 2222 2223 2224
  }
  return value;
}


longlong Item_func_min_max::val_int()
{
2225
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2226 2227 2228
  longlong value=0;
  for (uint i=0; i < arg_count ; i++)
  {
2229
    if (i == 0)
2230
      value=args[i]->val_int();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2231 2232
    else
    {
2233 2234 2235
      longlong tmp=args[i]->val_int();
      if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
	value=tmp;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2236
    }
2237 2238
    if ((null_value= args[i]->null_value))
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2239 2240 2241 2242
  }
  return value;
}

2243 2244 2245 2246

my_decimal *Item_func_min_max::val_decimal(my_decimal *dec)
{
  DBUG_ASSERT(fixed == 1);
2247 2248 2249
  my_decimal tmp_buf, *tmp, *res;
  LINT_INIT(res);

2250 2251
  for (uint i=0; i < arg_count ; i++)
  {
2252
    if (i == 0)
2253 2254 2255
      res= args[i]->val_decimal(dec);
    else
    {
2256 2257
      tmp= args[i]->val_decimal(&tmp_buf);      // Zero if NULL
      if (tmp && (my_decimal_cmp(tmp, res) * cmp_sign) < 0)
2258 2259 2260
      {
        if (tmp == &tmp_buf)
        {
2261
          /* Move value out of tmp_buf as this will be reused on next loop */
2262 2263 2264 2265 2266 2267 2268
          my_decimal2decimal(tmp, dec);
          res= dec;
        }
        else
          res= tmp;
      }
    }
2269
    if ((null_value= args[i]->null_value))
2270 2271
    {
      res= 0;
2272
      break;
2273
    }
2274 2275 2276 2277 2278
  }
  return res;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
2279 2280
longlong Item_func_length::val_int()
{
2281
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
  return (longlong) res->length();
}

2292

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2293 2294
longlong Item_func_char_length::val_int()
{
2295
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2296 2297 2298 2299 2300 2301 2302
  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
2303
  return (longlong) res->numchars();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2304 2305
}

2306

bar@bar.mysql.r18.ru's avatar
bar@bar.mysql.r18.ru committed
2307 2308
longlong Item_func_coercibility::val_int()
{
2309
  DBUG_ASSERT(fixed == 1);
bar@bar.mysql.r18.ru's avatar
bar@bar.mysql.r18.ru committed
2310
  null_value= 0;
2311
  return (longlong) args[0]->collation.derivation;
bar@bar.mysql.r18.ru's avatar
bar@bar.mysql.r18.ru committed
2312
}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2313

2314

2315 2316 2317
void Item_func_locate::fix_length_and_dec()
{
  maybe_null=0; max_length=11;
2318
  agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
2319 2320
}

2321

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2322 2323
longlong Item_func_locate::val_int()
{
2324
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2325 2326 2327 2328 2329 2330 2331 2332
  String *a=args[0]->val_str(&value1);
  String *b=args[1]->val_str(&value2);
  if (!a || !b)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
2333 2334 2335
  /* must be longlong to avoid truncation */
  longlong start=  0; 
  longlong start0= 0;
2336
  my_match_t match;
2337

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2338 2339
  if (arg_count == 3)
  {
2340 2341 2342 2343 2344 2345 2346 2347 2348
    start0= start= args[2]->val_int() - 1;

    if ((start < 0) || (start > a->length()))
      return 0;

    /* start is now sufficiently valid to pass to charpos function */
    start= a->charpos(start);

    if (start + b->length() > a->length())
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2349 2350
      return 0;
  }
2351

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2352
  if (!b->length())				// Found empty string at start
2353
    return start + 1;
2354
  
2355
  if (!cmp_collation.collation->coll->instr(cmp_collation.collation,
2356
                                            a->ptr()+start, a->length()-start,
2357 2358 2359 2360
                                            b->ptr(), b->length(),
                                            &match, 1))
    return 0;
  return (longlong) match.mblen + start0 + 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2361 2362 2363
}


2364 2365
void Item_func_locate::print(String *str)
{
2366
  str->append(STRING_WITH_LEN("locate("));
2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378
  args[1]->print(str);
  str->append(',');
  args[0]->print(str);
  if (arg_count == 3)
  {
    str->append(',');
    args[2]->print(str);
  }
  str->append(')');
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
2379 2380
longlong Item_func_field::val_int()
{
2381
  DBUG_ASSERT(fixed == 1);
2382

2383 2384 2385
  if (cmp_type == STRING_RESULT)
  {
    String *field;
2386 2387
    if (!(field= args[0]->val_str(&value)))
      return 0;
2388
    for (uint i=1 ; i < arg_count ; i++)
2389 2390
    {
      String *tmp_value=args[i]->val_str(&tmp);
bar@bar.mysql.r18.ru's avatar
Fix:  
bar@bar.mysql.r18.ru committed
2391
      if (tmp_value && !sortcmp(field,tmp_value,cmp_collation.collation))
2392
        return (longlong) (i);
2393 2394 2395 2396
    }
  }
  else if (cmp_type == INT_RESULT)
  {
2397
    longlong val= args[0]->val_int();
serg@serg.mylan's avatar
serg@serg.mylan committed
2398 2399
    if (args[0]->null_value)
      return 0;
2400
    for (uint i=1; i < arg_count ; i++)
2401
    {
2402
      if (val == args[i]->val_int() && !args[i]->null_value)
2403
        return (longlong) (i);
2404 2405
    }
  }
2406 2407 2408 2409
  else if (cmp_type == DECIMAL_RESULT)
  {
    my_decimal dec_arg_buf, *dec_arg,
               dec_buf, *dec= args[0]->val_decimal(&dec_buf);
serg@serg.mylan's avatar
serg@serg.mylan committed
2410 2411
    if (args[0]->null_value)
      return 0;
2412 2413 2414
    for (uint i=1; i < arg_count; i++)
    {
      dec_arg= args[i]->val_decimal(&dec_arg_buf);
monty@mysql.com's avatar
monty@mysql.com committed
2415
      if (!args[i]->null_value && !my_decimal_cmp(dec_arg, dec))
2416 2417 2418
        return (longlong) (i);
    }
  }
2419
  else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2420
  {
2421
    double val= args[0]->val_real();
serg@serg.mylan's avatar
serg@serg.mylan committed
2422 2423
    if (args[0]->null_value)
      return 0;
2424
    for (uint i=1; i < arg_count ; i++)
2425
    {
monty@mysql.com's avatar
monty@mysql.com committed
2426
      if (val == args[i]->val_real() && !args[i]->null_value)
2427
        return (longlong) (i);
2428
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2429 2430 2431 2432
  }
  return 0;
}

2433

2434 2435 2436
void Item_func_field::fix_length_and_dec()
{
  maybe_null=0; max_length=3;
2437 2438
  cmp_type= args[0]->result_type();
  for (uint i=1; i < arg_count ; i++)
2439 2440
    cmp_type= item_cmp_type(cmp_type, args[i]->result_type());
  if (cmp_type == STRING_RESULT)
2441
    agg_arg_charsets(cmp_collation, args, arg_count, MY_COLL_CMP_CONV, 1);
2442
}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2443

2444

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2445 2446
longlong Item_func_ascii::val_int()
{
2447
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459
  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (longlong) (res->length() ? (uchar) (*res)[0] : (uchar) 0);
}

longlong Item_func_ord::val_int()
{
2460
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2461 2462 2463 2464 2465 2466 2467 2468 2469
  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  if (!res->length()) return 0;
#ifdef USE_MB
2470
  if (use_mb(res->charset()))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2471 2472
  {
    register const char *str=res->ptr();
2473
    register uint32 n=0, l=my_ismbchar(res->charset(),str,str+res->length());
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2474 2475
    if (!l)
      return (longlong)((uchar) *str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499
    while (l--)
      n=(n<<8)|(uint32)((uchar) *str++);
    return (longlong) n;
  }
#endif
  return (longlong) ((uchar) (*res)[0]);
}

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

void Item_func_find_in_set::fix_length_and_dec()
{
  decimals=0;
  max_length=3;					// 1-999
  if (args[0]->const_item() && args[1]->type() == FIELD_ITEM)
  {
    Field *field= ((Item_field*) args[1])->field;
    if (field->real_type() == FIELD_TYPE_SET)
    {
      String *find=args[0]->val_str(&value);
      if (find)
      {
2500 2501
	enum_value= find_type(((Field_enum*) field)->typelib,find->ptr(),
			      find->length(), 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2502 2503 2504 2505 2506 2507
	enum_bit=0;
	if (enum_value)
	  enum_bit=LL(1) << (enum_value-1);
      }
    }
  }
2508
  agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2509 2510 2511 2512 2513 2514
}

static const char separator=',';

longlong Item_func_find_in_set::val_int()
{
2515
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
  if (enum_value)
  {
    ulonglong tmp=(ulonglong) args[1]->val_int();
    if (!(null_value=args[1]->null_value || args[0]->null_value))
    {
      if (tmp & enum_bit)
	return enum_value;
    }
    return 0L;
  }

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

  int diff;
  if ((diff=buffer->length() - find->length()) >= 0)
  {
2539 2540 2541 2542 2543 2544 2545 2546 2547
    my_wc_t wc;
    CHARSET_INFO *cs= cmp_collation.collation;
    const char *str_begin= buffer->ptr();
    const char *str_end= buffer->ptr();
    const char *real_end= str_end+buffer->length();
    const uchar *find_str= (const uchar *) find->ptr();
    uint find_str_len= find->length();
    int position= 0;
    while (1)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2548
    {
2549 2550 2551
      int symbol_len;
      if ((symbol_len= cs->cset->mb_wc(cs, &wc, (uchar*) str_end, 
                                       (uchar*) real_end)) > 0)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2552
      {
2553 2554
        const char *substr_end= str_end + symbol_len;
        bool is_last_item= (substr_end == real_end);
2555 2556
        bool is_separator= (wc == (my_wc_t) separator);
        if (is_separator || is_last_item)
2557 2558
        {
          position++;
2559
          if (is_last_item && !is_separator)
2560 2561 2562 2563 2564 2565 2566 2567 2568
            str_end= substr_end;
          if (!my_strnncoll(cs, (const uchar *) str_begin,
                            str_end - str_begin,
                            find_str, find_str_len))
            return (longlong) position;
          else
            str_begin= substr_end;
        }
        str_end= substr_end;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2569
      }
serg@serg.mylan's avatar
serg@serg.mylan committed
2570 2571
      else if (str_end - str_begin == 0 &&
               find_str_len == 0 &&
2572 2573 2574
               wc == (my_wc_t) separator)
        return (longlong) ++position;
      else
serg@serg.mylan's avatar
serg@serg.mylan committed
2575
        return LL(0);
2576
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2577 2578 2579 2580 2581 2582
  }
  return 0;
}

longlong Item_func_bit_count::val_int()
{
2583
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2584
  ulonglong value= (ulonglong) args[0]->val_int();
2585
  if ((null_value= args[0]->null_value))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2586
    return 0; /* purecov: inspected */
2587
  return (longlong) my_count_bits(value);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2588 2589 2590 2591 2592 2593
}


/****************************************************************************
** Functions to handle dynamic loadable functions
** Original source by: Alexis Mikhailov <root@medinf.chuvashia.su>
2594
** Rewritten by monty.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2595 2596 2597 2598
****************************************************************************/

#ifdef HAVE_DLOPEN

2599
void udf_handler::cleanup()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2600
{
2601
  if (!not_original)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2602
  {
2603
    if (initialized)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2604
    {
2605 2606
      if (u_d->func_deinit != NULL)
      {
2607
        Udf_func_deinit deinit= u_d->func_deinit;
2608 2609 2610
        (*deinit)(&initid);
      }
      free_udf(u_d);
2611
      initialized= FALSE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2612
    }
2613 2614
    if (buffers)				// Because of bug in ecc
      delete [] buffers;
2615
    buffers= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2616 2617 2618 2619 2620
  }
}


bool
2621
udf_handler::fix_fields(THD *thd, Item_result_field *func,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2622 2623
			uint arg_count, Item **arguments)
{
2624 2625 2626
#ifndef EMBEDDED_LIBRARY			// Avoid compiler warning
  char buff[STACK_BUFF_ALLOC];			// Max argument in function
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2627 2628
  DBUG_ENTER("Item_udf_func::fix_fields");

2629
  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
2630
    DBUG_RETURN(TRUE);				// Fatal error flag is set!
2631

2632
  udf_func *tmp_udf=find_udf(u_d->name.str,(uint) u_d->name.length,1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2633 2634 2635

  if (!tmp_udf)
  {
2636
    my_error(ER_CANT_FIND_UDF, MYF(0), u_d->name.str, errno);
2637
    DBUG_RETURN(TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2638 2639 2640 2641 2642
  }
  u_d=tmp_udf;
  args=arguments;

  /* Fix all arguments */
2643
  func->maybe_null=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653
  used_tables_cache=0;
  const_item_cache=1;

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

    {
      free_udf(u_d);
2654
      DBUG_RETURN(TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2655 2656 2657 2658 2659 2660 2661
    }
    uint i;
    Item **arg,**arg_end;
    for (i=0, arg=arguments, arg_end=arguments+arg_count;
	 arg != arg_end ;
	 arg++,i++)
    {
2662
      if (!(*arg)->fixed &&
2663
          (*arg)->fix_fields(thd, arg))
2664
	DBUG_RETURN(1);
2665
      // we can't assign 'item' before, because fix_fields() can change arg
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2666
      Item *item= *arg;
2667
      if (item->check_cols(1))
2668
	DBUG_RETURN(TRUE);
2669 2670 2671 2672 2673 2674 2675 2676 2677
      /*
	TODO: We should think about this. It is not always
	right way just to set an UDF result to return my_charset_bin
	if one argument has binary sorting order.
	The result collation should be calculated according to arguments
	derivations in some cases and should not in other cases.
	Moreover, some arguments can represent a numeric input
	which doesn't effect the result character set and collation.
	There is no a general rule for UDF. Everything depends on
2678
        the particular user defined function.
2679
      */
2680 2681
      if (item->collation.collation->state & MY_CS_BINSORT)
	func->collation.set(&my_charset_bin);
2682
      if (item->maybe_null)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2683
	func->maybe_null=1;
2684 2685 2686 2687
      func->with_sum_func= func->with_sum_func || item->with_sum_func;
      used_tables_cache|=item->used_tables();
      const_item_cache&=item->const_item();
      f_args.arg_type[i]=item->result_type();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2688
    }
2689
    //TODO: why all following memory is not allocated with 1 call of sql_alloc?
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2690 2691
    if (!(buffers=new String[arg_count]) ||
	!(f_args.args= (char**) sql_alloc(arg_count * sizeof(char *))) ||
2692 2693 2694 2695 2696 2697 2698
	!(f_args.lengths= (ulong*) sql_alloc(arg_count * sizeof(long))) ||
	!(f_args.maybe_null= (char*) sql_alloc(arg_count * sizeof(char))) ||
	!(num_buffer= (char*) sql_alloc(arg_count *
					ALIGN_SIZE(sizeof(double)))) ||
	!(f_args.attributes= (char**) sql_alloc(arg_count * sizeof(char *))) ||
	!(f_args.attribute_lengths= (ulong*) sql_alloc(arg_count *
						       sizeof(long))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2699 2700
    {
      free_udf(u_d);
2701
      DBUG_RETURN(TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716
    }
  }
  func->fix_length_and_dec();
  initid.max_length=func->max_length;
  initid.maybe_null=func->maybe_null;
  initid.const_item=const_item_cache;
  initid.decimals=func->decimals;
  initid.ptr=0;

  if (u_d->func_init)
  {
    char *to=num_buffer;
    for (uint i=0; i < arg_count; i++)
    {
      f_args.args[i]=0;
2717 2718 2719 2720
      f_args.lengths[i]= arguments[i]->max_length;
      f_args.maybe_null[i]= (char) arguments[i]->maybe_null;
      f_args.attributes[i]= arguments[i]->name;
      f_args.attribute_lengths[i]= arguments[i]->name_length;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2721 2722 2723 2724

      switch(arguments[i]->type()) {
      case Item::STRING_ITEM:			// Constant string !
      {
2725
	String *res=arguments[i]->val_str(&buffers[i]);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739
	if (arguments[i]->null_value)
	  continue;
	f_args.args[i]=    (char*) res->ptr();
	break;
      }
      case Item::INT_ITEM:
	*((longlong*) to) = arguments[i]->val_int();
	if (!arguments[i]->null_value)
	{
	  f_args.args[i]=to;
	  to+= ALIGN_SIZE(sizeof(longlong));
	}
	break;
      case Item::REAL_ITEM:
2740
	*((double*) to)= arguments[i]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2741 2742 2743 2744 2745 2746 2747 2748 2749 2750
	if (!arguments[i]->null_value)
	{
	  f_args.args[i]=to;
	  to+= ALIGN_SIZE(sizeof(double));
	}
	break;
      default:					// Skip these
	break;
      }
    }
2751
    thd->net.last_error[0]=0;
2752
    Udf_func_init init= u_d->func_init;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2753 2754
    if ((error=(uchar) init(&initid, &f_args, thd->net.last_error)))
    {
2755 2756
      my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
               u_d->name.str, thd->net.last_error);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2757
      free_udf(u_d);
2758
      DBUG_RETURN(TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2759 2760 2761 2762
    }
    func->max_length=min(initid.max_length,MAX_BLOB_WIDTH);
    func->maybe_null=initid.maybe_null;
    const_item_cache=initid.const_item;
2763
    func->decimals=min(initid.decimals,NOT_FIXED_DEC);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2764 2765 2766 2767
  }
  initialized=1;
  if (error)
  {
2768 2769
    my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
             u_d->name.str, ER(ER_UNKNOWN_ERROR));
2770
    DBUG_RETURN(TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2771
  }
2772
  DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786
}


bool udf_handler::get_arguments()
{
  if (error)
    return 1;					// Got an error earlier
  char *to= num_buffer;
  uint str_count=0;
  for (uint i=0; i < f_args.arg_count; i++)
  {
    f_args.args[i]=0;
    switch (f_args.arg_type[i]) {
    case STRING_RESULT:
2787
    case DECIMAL_RESULT:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805
      {
	String *res=args[i]->val_str(&buffers[str_count++]);
	if (!(args[i]->null_value))
	{
	  f_args.args[i]=    (char*) res->ptr();
	  f_args.lengths[i]= res->length();
	  break;
	}
      }
    case INT_RESULT:
      *((longlong*) to) = args[i]->val_int();
      if (!args[i]->null_value)
      {
	f_args.args[i]=to;
	to+= ALIGN_SIZE(sizeof(longlong));
      }
      break;
    case REAL_RESULT:
2806
      *((double*) to)= args[i]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2807 2808 2809 2810 2811 2812
      if (!args[i]->null_value)
      {
	f_args.args[i]=to;
	to+= ALIGN_SIZE(sizeof(double));
      }
      break;
2813
    case ROW_RESULT:
2814
    default:
2815
      // This case should never be chosen
2816
      DBUG_ASSERT(0);
2817
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2818 2819 2820 2821 2822 2823 2824 2825 2826
    }
  }
  return 0;
}

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

String *udf_handler::val_str(String *str,String *save_str)
{
2827
  uchar is_null_tmp=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2828
  ulong res_length;
2829
  DBUG_ENTER("udf_handler::val_str");
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2830 2831

  if (get_arguments())
2832
    DBUG_RETURN(0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2833 2834 2835 2836 2837 2838 2839 2840 2841
  char * (*func)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *)=
    (char* (*)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *))
    u_d->func;

  if ((res_length=str->alloced_length()) < MAX_FIELD_WIDTH)
  {						// This happens VERY seldom
    if (str->alloc(MAX_FIELD_WIDTH))
    {
      error=1;
2842
      DBUG_RETURN(0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2843 2844
    }
  }
2845 2846
  char *res=func(&initid, &f_args, (char*) str->ptr(), &res_length,
		 &is_null_tmp, &error);
2847
  DBUG_PRINT("info", ("udf func returned, res_length: %lu", res_length));
2848
  if (is_null_tmp || !res || error)		// The !res is for safety
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2849
  {
2850 2851
    DBUG_PRINT("info", ("Null or error"));
    DBUG_RETURN(0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2852 2853 2854 2855
  }
  if (res == str->ptr())
  {
    str->length(res_length);
2856 2857
    DBUG_PRINT("exit", ("str: %s", str->ptr()));
    DBUG_RETURN(str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2858
  }
2859
  save_str->set(res, res_length, str->charset());
2860 2861
  DBUG_PRINT("exit", ("save_str: %s", save_str->ptr()));
  DBUG_RETURN(save_str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2862 2863 2864
}


2865 2866 2867 2868
/*
  For the moment, UDF functions are returning DECIMAL values as strings
*/

2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888
my_decimal *udf_handler::val_decimal(my_bool *null_value, my_decimal *dec_buf)
{
  char buf[DECIMAL_MAX_STR_LENGTH+1], *end;
  ulong res_length= DECIMAL_MAX_STR_LENGTH;

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

  char *res= func(&initid, &f_args, buf, &res_length, &is_null, &error);
  if (is_null || error)
  {
    *null_value= 1;
    return 0;
  }
2889 2890
  end= res+ res_length;
  str2my_decimal(E_DEC_FATAL_ERROR, res, dec_buf, &end);
2891 2892 2893
  return dec_buf;
}

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2894

2895 2896 2897 2898 2899 2900
void Item_udf_func::cleanup()
{
  udf.cleanup();
  Item_func::cleanup();
}

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2901

2902
double Item_func_udf_float::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2903
{
2904
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2905 2906 2907 2908 2909 2910 2911 2912 2913
  DBUG_ENTER("Item_func_udf_float::val");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
		     args[0]->result_type(), arg_count));
  DBUG_RETURN(udf.val(&null_value));
}


String *Item_func_udf_float::val_str(String *str)
{
2914
  DBUG_ASSERT(fixed == 1);
2915
  double nr= val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2916 2917
  if (null_value)
    return 0;					/* purecov: inspected */
2918
  str->set_real(nr,decimals,&my_charset_bin);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2919 2920 2921 2922 2923 2924
  return str;
}


longlong Item_func_udf_int::val_int()
{
2925
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2926 2927 2928 2929 2930 2931 2932
  DBUG_ENTER("Item_func_udf_int::val_int");
  DBUG_RETURN(udf.val_int(&null_value));
}


String *Item_func_udf_int::val_str(String *str)
{
2933
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2934 2935 2936
  longlong nr=val_int();
  if (null_value)
    return 0;
2937
  str->set_int(nr, unsigned_flag, &my_charset_bin);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2938 2939 2940
  return str;
}

2941 2942 2943 2944

longlong Item_func_udf_decimal::val_int()
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
2945
  longlong result;
2946 2947 2948 2949 2950 2951 2952 2953 2954 2955
  if (null_value)
    return 0;
  my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
  return result;
}


double Item_func_udf_decimal::val_real()
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
2956
  double result;
2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993
  if (null_value)
    return 0.0;
  my_decimal2double(E_DEC_FATAL_ERROR, dec, &result);
  return result;
}


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

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


String *Item_func_udf_decimal::val_str(String *str)
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
  if (null_value)
    return 0;
  if (str->length() < DECIMAL_MAX_STR_LENGTH)
    str->length(DECIMAL_MAX_STR_LENGTH);
  my_decimal_round(E_DEC_FATAL_ERROR, dec, decimals, FALSE, &dec_buf);
  my_decimal2string(E_DEC_FATAL_ERROR, &dec_buf, 0, 0, '0', str);
  return str;
}


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


bk@work.mysql.com's avatar
bk@work.mysql.com committed
2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006
/* Default max_length is max argument length */

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

String *Item_func_udf_str::val_str(String *str)
{
3007
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3008 3009 3010 3011 3012
  String *res=udf.val_str(str,&str_value);
  null_value = !res;
  return res;
}

3013 3014

/*
3015 3016
   This has to come last in the udf_handler methods, or C for AIX
   version 6.0.0.0 fails to compile with debugging enabled. (Yes, really.)
3017 3018 3019 3020
 */

udf_handler::~udf_handler()
{
3021 3022
  /* Everything should be properly cleaned up by this moment. */
  DBUG_ASSERT(not_original || !(initialized || buffers));
3023 3024
}

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035
#else
bool udf_handler::get_arguments() { return 0; }
#endif /* HAVE_DLOPEN */

/*
** User level locks
*/

pthread_mutex_t LOCK_user_locks;
static HASH hash_user_locks;

3036
class User_level_lock
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3037 3038 3039 3040 3041 3042 3043 3044 3045
{
  char *key;
  uint key_length;

public:
  int count;
  bool locked;
  pthread_cond_t cond;
  pthread_t thread;
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
3046
  ulong thread_id;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3047

3048
  User_level_lock(const char *key_arg,uint length, ulong id) 
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
3049
    :key_length(length),count(1),locked(1), thread_id(id)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3050 3051 3052 3053 3054
  {
    key=(char*) my_memdup((byte*) key_arg,length,MYF(0));
    pthread_cond_init(&cond,NULL);
    if (key)
    {
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3055
      if (my_hash_insert(&hash_user_locks,(byte*) this))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3056 3057 3058 3059 3060 3061
      {
	my_free((gptr) key,MYF(0));
	key=0;
      }
    }
  }
3062
  ~User_level_lock()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3063 3064 3065 3066 3067 3068 3069 3070 3071
  {
    if (key)
    {
      hash_delete(&hash_user_locks,(byte*) this);
      my_free((gptr) key,MYF(0));
    }
    pthread_cond_destroy(&cond);
  }
  inline bool initialized() { return key != 0; }
3072 3073 3074
  friend void item_user_lock_release(User_level_lock *ull);
  friend char *ull_get_key(const User_level_lock *ull, uint *length,
                           my_bool not_used);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3075 3076
};

3077
char *ull_get_key(const User_level_lock *ull, uint *length,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3078 3079 3080 3081 3082 3083
		  my_bool not_used __attribute__((unused)))
{
  *length=(uint) ull->key_length;
  return (char*) ull->key;
}

3084 3085 3086

static bool item_user_lock_inited= 0;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3087 3088
void item_user_lock_init(void)
{
3089
  pthread_mutex_init(&LOCK_user_locks,MY_MUTEX_INIT_SLOW);
3090 3091
  hash_init(&hash_user_locks,system_charset_info,
	    16,0,0,(hash_get_key) ull_get_key,NULL,0);
3092
  item_user_lock_inited= 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3093 3094 3095 3096
}

void item_user_lock_free(void)
{
3097 3098 3099 3100 3101 3102
  if (item_user_lock_inited)
  {
    item_user_lock_inited= 0;
    hash_free(&hash_user_locks);
    pthread_mutex_destroy(&LOCK_user_locks);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3103 3104
}

3105
void item_user_lock_release(User_level_lock *ull)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3106 3107
{
  ull->locked=0;
3108
  ull->thread_id= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3109 3110 3111 3112 3113 3114
  if (--ull->count)
    pthread_cond_signal(&ull->cond);
  else
    delete ull;
}

3115 3116 3117 3118 3119 3120 3121
/*
   Wait until we are at or past the given position in the master binlog
   on the slave
 */

longlong Item_master_pos_wait::val_int()
{
3122
  DBUG_ASSERT(fixed == 1);
3123 3124
  THD* thd = current_thd;
  String *log_name = args[0]->val_str(&value);
3125
  int event_count= 0;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3126

monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3127 3128 3129 3130 3131 3132
  null_value=0;
  if (thd->slave_thread || !log_name || !log_name->length())
  {
    null_value = 1;
    return 0;
  }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3133
  longlong pos = (ulong)args[1]->val_int();
3134
  longlong timeout = (arg_count==3) ? args[2]->val_int() : 0 ;
hf@deer.mysql.r18.ru's avatar
SCRUM  
hf@deer.mysql.r18.ru committed
3135
#ifdef HAVE_REPLICATION
3136
  if ((event_count = active_mi->rli.wait_for_pos(thd, log_name, pos, timeout)) == -2)
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3137 3138 3139 3140
  {
    null_value = 1;
    event_count=0;
  }
3141
#endif
3142 3143 3144
  return event_count;
}

3145 3146 3147 3148
#ifdef EXTRA_DEBUG
void debug_sync_point(const char* lock_name, uint lock_timeout)
{
  THD* thd=current_thd;
3149
  User_level_lock* ull;
3150
  struct timespec abstime;
3151
  int lock_name_len;
3152 3153 3154 3155 3156 3157 3158 3159 3160
  lock_name_len=strlen(lock_name);
  pthread_mutex_lock(&LOCK_user_locks);

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

3161 3162 3163 3164 3165
  /*
    If the lock has not been aquired by some client, we do not want to
    create an entry for it, since we immediately release the lock. In
    this case, we will not be waiting, but rather, just waste CPU and
    memory on the whole deal
3166
  */
3167
  if (!(ull= ((User_level_lock*) hash_search(&hash_user_locks, lock_name,
3168 3169 3170 3171 3172 3173 3174
				 lock_name_len))))
  {
    pthread_mutex_unlock(&LOCK_user_locks);
    return;
  }
  ull->count++;

3175 3176 3177 3178
  /*
    Structure is now initialized.  Try to get the lock.
    Set up control struct to allow others to abort locks
  */
3179 3180 3181 3182
  thd->proc_info="User lock";
  thd->mysys_var->current_mutex= &LOCK_user_locks;
  thd->mysys_var->current_cond=  &ull->cond;

3183
  set_timespec(abstime,lock_timeout);
monty@mysql.com's avatar
monty@mysql.com committed
3184 3185 3186 3187 3188 3189 3190
  while (ull->locked && !thd->killed)
  {
    int error= pthread_cond_timedwait(&ull->cond, &LOCK_user_locks, &abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
  }

3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218
  if (ull->locked)
  {
    if (!--ull->count)
      delete ull;				// Should never happen
  }
  else
  {
    ull->locked=1;
    ull->thread=thd->real_id;
    thd->ull=ull;
  }
  pthread_mutex_unlock(&LOCK_user_locks);
  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->proc_info=0;
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond=  0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);
  pthread_mutex_lock(&LOCK_user_locks);
  if (thd->ull)
  {
    item_user_lock_release(thd->ull);
    thd->ull=0;
  }
  pthread_mutex_unlock(&LOCK_user_locks);
}

#endif

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3219 3220 3221 3222 3223 3224 3225 3226 3227
/*
  Get a user level lock. If the thread has an old lock this is first released.
  Returns 1:  Got lock
  Returns 0:  Timeout
  Returns NULL: Error
*/

longlong Item_func_get_lock::val_int()
{
3228
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3229 3230 3231 3232
  String *res=args[0]->val_str(&value);
  longlong timeout=args[1]->val_int();
  struct timespec abstime;
  THD *thd=current_thd;
3233
  User_level_lock *ull;
monty@mysql.com's avatar
monty@mysql.com committed
3234
  int error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3235

3236 3237 3238 3239 3240 3241 3242 3243 3244 3245
  /*
    In slave thread no need to get locks, everything is serialized. Anyway
    there is no way to make GET_LOCK() work on slave like it did on master
    (i.e. make it return exactly the same value) because we don't have the
    same other concurrent threads environment. No matter what we return here,
    it's not guaranteed to be same as on master.
  */
  if (thd->slave_thread)
    return 1;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261
  pthread_mutex_lock(&LOCK_user_locks);

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

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

3262 3263 3264
  if (!(ull= ((User_level_lock *) hash_search(&hash_user_locks,
                                              (byte*) res->ptr(),
                                              res->length()))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3265
  {
3266
    ull=new User_level_lock(res->ptr(),res->length(), thd->thread_id);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280
    if (!ull || !ull->initialized())
    {
      delete ull;
      pthread_mutex_unlock(&LOCK_user_locks);
      null_value=1;				// Probably out of memory
      return 0;
    }
    ull->thread=thd->real_id;
    thd->ull=ull;
    pthread_mutex_unlock(&LOCK_user_locks);
    return 1;					// Got new lock
  }
  ull->count++;

3281 3282 3283 3284
  /*
    Structure is now initialized.  Try to get the lock.
    Set up control struct to allow others to abort locks.
  */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3285 3286 3287 3288
  thd->proc_info="User lock";
  thd->mysys_var->current_mutex= &LOCK_user_locks;
  thd->mysys_var->current_cond=  &ull->cond;

3289
  set_timespec(abstime,timeout);
monty@mysql.com's avatar
monty@mysql.com committed
3290 3291 3292 3293 3294 3295 3296 3297 3298
  error= 0;
  while (ull->locked && !thd->killed)
  {
    error= pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
    error= 0;
  }

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3299 3300 3301
  if (ull->locked)
  {
    if (!--ull->count)
monty@mysql.com's avatar
monty@mysql.com committed
3302 3303
    {
      DBUG_ASSERT(0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3304
      delete ull;				// Should never happen
monty@mysql.com's avatar
monty@mysql.com committed
3305 3306
    }
    if (!error)                                 // Killed (thd->killed != 0)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3307 3308 3309 3310 3311
    {
      error=1;
      null_value=1;				// Return NULL
    }
  }
monty@mysql.com's avatar
monty@mysql.com committed
3312
  else                                          // We got the lock
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3313 3314 3315
  {
    ull->locked=1;
    ull->thread=thd->real_id;
3316
    ull->thread_id= thd->thread_id;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332
    thd->ull=ull;
    error=0;
  }
  pthread_mutex_unlock(&LOCK_user_locks);

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

  return !error ? 1 : 0;
}


/*
3333 3334 3335 3336 3337
  Release a user level lock.
  Return:
    1 if lock released
    0 if lock wasn't held
    (SQL) NULL if no such lock
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3338 3339 3340 3341
*/

longlong Item_func_release_lock::val_int()
{
3342
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3343
  String *res=args[0]->val_str(&value);
3344
  User_level_lock *ull;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3345 3346 3347 3348 3349 3350 3351 3352 3353 3354
  longlong result;
  if (!res || !res->length())
  {
    null_value=1;
    return 0;
  }
  null_value=0;

  result=0;
  pthread_mutex_lock(&LOCK_user_locks);
3355 3356 3357
  if (!(ull= ((User_level_lock*) hash_search(&hash_user_locks,
                                             (const byte*) res->ptr(),
                                             res->length()))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374
  {
    null_value=1;
  }
  else
  {
    if (ull->locked && pthread_equal(pthread_self(),ull->thread))
    {
      result=1;					// Release is ok
      item_user_lock_release(ull);
      current_thd->ull=0;
    }
  }
  pthread_mutex_unlock(&LOCK_user_locks);
  return result;
}


3375
longlong Item_func_last_insert_id::val_int()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3376
{
3377
  THD *thd= current_thd;
3378
  DBUG_ASSERT(fixed == 1);
3379 3380
  if (arg_count)
  {
3381 3382
    longlong value= args[0]->val_int();
    null_value= args[0]->null_value;
3383 3384 3385 3386 3387 3388 3389 3390 3391 3392
    /*
      LAST_INSERT_ID(X) must affect the client's mysql_insert_id() as
      documented in the manual. We don't want to touch
      first_successful_insert_id_in_cur_stmt because it would make
      LAST_INSERT_ID(X) take precedence over an generated auto_increment
      value for this row.
    */
    thd->arg_of_last_insert_id_function= TRUE;
    thd->first_successful_insert_id_in_prev_stmt= value;
    return value;
3393
  }
3394
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
3395
  return thd->read_first_successful_insert_id_in_prev_stmt();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3396 3397 3398 3399 3400 3401
}

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

longlong Item_func_benchmark::val_int()
{
3402
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3403
  char buff[MAX_FIELD_WIDTH];
3404
  String tmp(buff,sizeof(buff), &my_charset_bin);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3405 3406 3407 3408 3409 3410
  THD *thd=current_thd;

  for (ulong loop=0 ; loop < loop_count && !thd->killed; loop++)
  {
    switch (args[0]->result_type()) {
    case REAL_RESULT:
3411
      (void) args[0]->val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3412 3413 3414 3415 3416 3417 3418
      break;
    case INT_RESULT:
      (void) args[0]->val_int();
      break;
    case STRING_RESULT:
      (void) args[0]->val_str(&tmp);
      break;
3419
    case ROW_RESULT:
3420
    default:
3421
      // This case should never be chosen
3422 3423
      DBUG_ASSERT(0);
      return 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3424 3425 3426 3427 3428
    }
  }
  return 0;
}

3429

3430 3431
void Item_func_benchmark::print(String *str)
{
3432
  str->append(STRING_WITH_LEN("benchmark("));
3433
  char buffer[20];
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3434 3435 3436
  // my_charset_bin is good enough for numbers
  String st(buffer, sizeof(buffer), &my_charset_bin);
  st.set((ulonglong)loop_count, &my_charset_bin);
3437 3438 3439 3440 3441 3442
  str->append(st);
  str->append(',');
  args[0]->print(str);
  str->append(')');
}

monty@mysql.com's avatar
monty@mysql.com committed
3443

3444 3445 3446 3447
/* This function is just used to create tests with time gaps */

longlong Item_func_sleep::val_int()
{
3448 3449 3450
  THD *thd= current_thd;
  struct timespec abstime;
  pthread_cond_t cond;
3451
  int error;
3452

3453
  DBUG_ASSERT(fixed == 1);
3454

3455
  double time= args[0]->val_real();
3456 3457 3458 3459 3460 3461 3462 3463
  set_timespec_nsec(abstime, (ulonglong)(time * ULL(1000000000)));

  pthread_cond_init(&cond, NULL);
  pthread_mutex_lock(&LOCK_user_locks);

  thd->mysys_var->current_mutex= &LOCK_user_locks;
  thd->mysys_var->current_cond=  &cond;

monty@mysql.com's avatar
monty@mysql.com committed
3464 3465 3466 3467 3468 3469 3470 3471
  error= 0;
  while (!thd->killed)
  {
    error= pthread_cond_timedwait(&cond, &LOCK_user_locks, &abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
    error= 0;
  }
3472 3473 3474 3475 3476 3477 3478 3479 3480

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

  pthread_mutex_unlock(&LOCK_user_locks);
  pthread_cond_destroy(&cond);

monty@mysql.com's avatar
monty@mysql.com committed
3481
  return test(!error); 		// Return 1 killed
3482 3483 3484
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505
#define extra_size sizeof(double)

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

  if (!(entry = (user_var_entry*) hash_search(hash, (byte*) name.str,
					      name.length)) &&
      create_if_not_exists)
  {
    uint size=ALIGN_SIZE(sizeof(user_var_entry))+name.length+1+extra_size;
    if (!hash_inited(hash))
      return 0;
    if (!(entry = (user_var_entry*) my_malloc(size,MYF(MY_WME))))
      return 0;
    entry->name.str=(char*) entry+ ALIGN_SIZE(sizeof(user_var_entry))+
      extra_size;
    entry->name.length=name.length;
    entry->value=0;
    entry->length=0;
3506
    entry->update_query_id=0;
3507
    entry->collation.set(NULL, DERIVATION_IMPLICIT);
kaa@polly.local's avatar
kaa@polly.local committed
3508
    entry->unsigned_flag= 0;
3509 3510 3511 3512 3513 3514 3515 3516 3517 3518
    /*
      If we are here, we were called from a SET or a query which sets a
      variable. Imagine it is this:
      INSERT INTO t SELECT @a:=10, @a:=@a+1.
      Then when we have a Item_func_get_user_var (because of the @a+1) so we
      think we have to write the value of @a to the binlog. But before that,
      we have a Item_func_set_user_var to create @a (@a:=10), in this we mark
      the variable as "already logged" (line below) so that it won't be logged
      by Item_func_get_user_var (because that's not necessary).
    */
3519
    entry->used_query_id=current_thd->query_id;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3520 3521
    entry->type=STRING_RESULT;
    memcpy(entry->name.str, name.str, name.length+1);
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3522
    if (my_hash_insert(hash,(byte*) entry))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3523 3524 3525 3526 3527 3528 3529 3530
    {
      my_free((char*) entry,MYF(0));
      return 0;
    }
  }
  return entry;
}

3531
/*
3532 3533
  When a user variable is updated (in a SET command or a query like
  SELECT @a:= ).
3534
*/
3535

3536
bool Item_func_set_user_var::fix_fields(THD *thd, Item **ref)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3537
{
3538
  DBUG_ASSERT(fixed == 0);
3539
  /* fix_fields will call Item_func_set_user_var::fix_length_and_dec */
3540
  if (Item_func::fix_fields(thd, ref) ||
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3541
      !(entry= get_variable(&thd->user_vars, name, 1)))
3542
    return TRUE;
3543 3544 3545 3546 3547
  /* 
     Remember the last query which updated it, this way a query can later know
     if this variable is a constant item in the query (it is if update_query_id
     is different from query_id).
  */
3548
  entry->update_query_id= thd->query_id;
3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563
  /*
    As it is wrong and confusing to associate any 
    character set with NULL, @a should be latin2
    after this query sequence:

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

    I.e. the second query should not change the charset
    to the current default value, but should keep the 
    original value assigned during the first query.
    In order to do it, we don't copy charset
    from the argument if the argument is NULL
    and the variable has previously been initialized.
  */
3564 3565
  null_item= (args[0]->type() == NULL_ITEM);
  if (!entry->collation.collation || !null_item)
3566 3567
    entry->collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
  collation.set(entry->collation.collation, DERIVATION_IMPLICIT);
3568
  cached_result_type= args[0]->result_type();
3569
  return FALSE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3570 3571 3572 3573 3574 3575 3576 3577 3578
}


void
Item_func_set_user_var::fix_length_and_dec()
{
  maybe_null=args[0]->maybe_null;
  max_length=args[0]->max_length;
  decimals=args[0]->decimals;
3579
  collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3580 3581
}

3582

3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594
/*
  Set value to user variable.

  SYNOPSYS
    update_hash()
    entry    - pointer to structure representing variable
    set_null - should we set NULL value ?
    ptr      - pointer to buffer with new value
    length   - length of new value
    type     - type of new value
    cs       - charset info for new value
    dv       - derivation for new value
3595
    unsigned_arg - indiates if a value of type INT_RESULT is unsigned
3596 3597 3598 3599 3600 3601 3602

  RETURN VALUE
    False - success, True - failure
*/

static bool
update_hash(user_var_entry *entry, bool set_null, void *ptr, uint length,
3603 3604
            Item_result type, CHARSET_INFO *cs, Derivation dv,
            bool unsigned_arg)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3605
{
3606
  if (set_null)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3607 3608 3609 3610
  {
    char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
    if (entry->value && entry->value != pos)
      my_free(entry->value,MYF(0));
3611 3612
    entry->value= 0;
    entry->length= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3613 3614 3615
  }
  else
  {
3616 3617
    if (type == STRING_RESULT)
      length++;					// Store strings with end \0
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638
    if (length <= extra_size)
    {
      /* Save value in value struct */
      char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
      if (entry->value != pos)
      {
	if (entry->value)
	  my_free(entry->value,MYF(0));
	entry->value=pos;
      }
    }
    else
    {
      /* Allocate variable */
      if (entry->length != length)
      {
	char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
	if (entry->value == pos)
	  entry->value=0;
	if (!(entry->value=(char*) my_realloc(entry->value, length,
					      MYF(MY_ALLOW_ZERO_PTR))))
3639
	  return 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3640 3641
      }
    }
3642 3643 3644 3645 3646
    if (type == STRING_RESULT)
    {
      length--;					// Fix length change above
      entry->value[length]= 0;			// Store end \0
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3647
    memcpy(entry->value,ptr,length);
3648 3649
    if (type == DECIMAL_RESULT)
      ((my_decimal*)entry->value)->fix_buffer_pointer();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3650
    entry->length= length;
3651
    entry->collation.set(cs, dv);
kaa@polly.local's avatar
kaa@polly.local committed
3652
    entry->unsigned_flag= unsigned_arg;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3653
  }
3654
  entry->type=type;
3655
  return 0;
3656
}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3657

3658 3659 3660

bool
Item_func_set_user_var::update_hash(void *ptr, uint length, Item_result type,
3661 3662
                                    CHARSET_INFO *cs, Derivation dv,
                                    bool unsigned_arg)
3663
{
3664 3665 3666 3667 3668 3669
  /*
    If we set a variable explicitely to NULL then keep the old
    result type of the variable
  */
  if ((null_value= args[0]->null_value) && null_item)
    type= entry->type;                          // Don't change type of item
3670
  if (::update_hash(entry, (null_value= args[0]->null_value),
3671
                    ptr, length, type, cs, dv, unsigned_arg))
3672 3673 3674 3675 3676 3677
  {
    current_thd->fatal_error();     // Probably end of memory
    null_value= 1;
    return 1;
  }
  return 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3678 3679 3680
}


3681 3682
/* Get the value of a variable as a double */

3683
double user_var_entry::val_real(my_bool *null_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3684
{
3685 3686 3687 3688 3689 3690 3691 3692
  if ((*null_value= (value == 0)))
    return 0.0;

  switch (type) {
  case REAL_RESULT:
    return *(double*) value;
  case INT_RESULT:
    return (double) *(longlong*) value;
3693 3694 3695 3696 3697 3698
  case DECIMAL_RESULT:
  {
    double result;
    my_decimal2double(E_DEC_FATAL_ERROR, (my_decimal *)value, &result);
    return result;
  }
3699
  case STRING_RESULT:
serg@serg.mylan's avatar
serg@serg.mylan committed
3700
    return my_atof(value);                      // This is null terminated
3701 3702 3703
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3704
  }
3705
  return 0.0;					// Impossible
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3706 3707 3708
}


3709 3710 3711
/* Get the value of a variable as an integer */

longlong user_var_entry::val_int(my_bool *null_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3712
{
3713 3714 3715 3716 3717 3718 3719 3720
  if ((*null_value= (value == 0)))
    return LL(0);

  switch (type) {
  case REAL_RESULT:
    return (longlong) *(double*) value;
  case INT_RESULT:
    return *(longlong*) value;
3721 3722 3723
  case DECIMAL_RESULT:
  {
    longlong result;
3724
    my_decimal2int(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, &result);
3725 3726
    return result;
  }
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3727
  case STRING_RESULT:
monty@mysql.com's avatar
monty@mysql.com committed
3728 3729 3730 3731
  {
    int error;
    return my_strtoll10(value, (char**) 0, &error);// String is null terminated
  }
3732 3733 3734
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3735
  }
3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749
  return LL(0);					// Impossible
}


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

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

  switch (type) {
  case REAL_RESULT:
3750
    str->set_real(*(double*) value, decimals, &my_charset_bin);
3751 3752
    break;
  case INT_RESULT:
3753 3754 3755 3756
    if (!unsigned_flag)
      str->set(*(longlong*) value, &my_charset_bin);
    else
      str->set(*(ulonglong*) value, &my_charset_bin);
3757
    break;
3758 3759 3760
  case DECIMAL_RESULT:
    my_decimal2string(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, 0, 0, str);
    break;
3761
  case STRING_RESULT:
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3762
    if (str->copy(value, length, collation.collation))
3763
      str= 0;					// EOM error
3764 3765 3766
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3767
  }
3768
  return(str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3769 3770
}

3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797
/* Get the value of a variable as a decimal */

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

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

3798 3799
/*
  This functions is invoked on SET @variable or @variable:= expression.
3800
  Evaluate (and check expression), store results.
3801 3802 3803 3804 3805

  SYNOPSYS
    Item_func_set_user_var::check()

  NOTES
3806 3807
    For now it always return OK. All problem with value evaluating
    will be caught by thd->net.report_error check in sql_set_variables().
3808 3809

  RETURN
3810
    FALSE OK.
3811 3812 3813
*/

bool
3814
Item_func_set_user_var::check(bool use_result_field)
3815 3816
{
  DBUG_ENTER("Item_func_set_user_var::check");
3817 3818
  if (use_result_field)
    DBUG_ASSERT(result_field);
3819 3820 3821 3822

  switch (cached_result_type) {
  case REAL_RESULT:
  {
3823 3824
    save_result.vreal= use_result_field ? result_field->val_real() :
                        args[0]->val_real();
3825 3826 3827 3828
    break;
  }
  case INT_RESULT:
  {
3829 3830 3831 3832
    save_result.vint= use_result_field ? result_field->val_int() :
                       args[0]->val_int();
    unsigned_flag= use_result_field ? ((Field_num*)result_field)->unsigned_flag:
                    args[0]->unsigned_flag;
3833 3834 3835 3836
    break;
  }
  case STRING_RESULT:
  {
3837 3838
    save_result.vstr= use_result_field ? result_field->val_str(&value) :
                       args[0]->val_str(&value);
3839 3840
    break;
  }
3841 3842
  case DECIMAL_RESULT:
  {
3843 3844 3845
    save_result.vdec= use_result_field ?
                       result_field->val_decimal(&decimal_buff) :
                       args[0]->val_decimal(&decimal_buff);
3846 3847
    break;
  }
3848 3849
  case ROW_RESULT:
  default:
3850
    // This case should never be chosen
3851 3852 3853
    DBUG_ASSERT(0);
    break;
  }
3854
  DBUG_RETURN(FALSE);
3855 3856
}

3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868

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

  SYNOPSIS
    Item_func_set_user_var::update()

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

  RETURN
3869
    0	OK
3870 3871 3872 3873
    1	EOM Error

*/

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3874 3875 3876
bool
Item_func_set_user_var::update()
{
3877 3878 3879 3880
  bool res;
  DBUG_ENTER("Item_func_set_user_var::update");
  LINT_INIT(res);

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3881 3882
  switch (cached_result_type) {
  case REAL_RESULT:
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3883
  {
3884
    res= update_hash((void*) &save_result.vreal,sizeof(save_result.vreal),
kaa@polly.local's avatar
kaa@polly.local committed
3885
		     REAL_RESULT, &my_charset_bin, DERIVATION_IMPLICIT, 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3886
    break;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3887
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3888
  case INT_RESULT:
3889
  {
3890
    res= update_hash((void*) &save_result.vint, sizeof(save_result.vint),
3891
                     INT_RESULT, &my_charset_bin, DERIVATION_IMPLICIT,
3892
                     unsigned_flag);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3893
    break;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3894
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3895
  case STRING_RESULT:
3896
  {
3897
    if (!save_result.vstr)					// Null value
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3898
      res= update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin,
kaa@polly.local's avatar
kaa@polly.local committed
3899
		       DERIVATION_IMPLICIT, 0);
3900
    else
3901 3902 3903
      res= update_hash((void*) save_result.vstr->ptr(),
		       save_result.vstr->length(), STRING_RESULT,
		       save_result.vstr->charset(),
kaa@polly.local's avatar
kaa@polly.local committed
3904
		       DERIVATION_IMPLICIT, 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3905 3906
    break;
  }
3907 3908 3909 3910
  case DECIMAL_RESULT:
  {
    if (!save_result.vdec)					// Null value
      res= update_hash((void*) 0, 0, DECIMAL_RESULT, &my_charset_bin,
kaa@polly.local's avatar
kaa@polly.local committed
3911
                       DERIVATION_IMPLICIT, 0);
3912 3913 3914
    else
      res= update_hash((void*) save_result.vdec,
                       sizeof(my_decimal), DECIMAL_RESULT,
kaa@polly.local's avatar
kaa@polly.local committed
3915
                       &my_charset_bin, DERIVATION_IMPLICIT, 0);
3916 3917
    break;
  }
3918
  case ROW_RESULT:
3919
  default:
3920
    // This case should never be chosen
3921 3922 3923
    DBUG_ASSERT(0);
    break;
  }
3924
  DBUG_RETURN(res);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3925 3926 3927
}


3928
double Item_func_set_user_var::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3929
{
3930
  DBUG_ASSERT(fixed == 1);
3931
  check(0);
3932
  update();					// Store expression
3933
  return entry->val_real(&null_value);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3934 3935
}

3936
longlong Item_func_set_user_var::val_int()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3937
{
3938
  DBUG_ASSERT(fixed == 1);
3939
  check(0);
3940 3941
  update();					// Store expression
  return entry->val_int(&null_value);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3942 3943
}

3944
String *Item_func_set_user_var::val_str(String *str)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3945
{
3946
  DBUG_ASSERT(fixed == 1);
3947
  check(0);
3948 3949
  update();					// Store expression
  return entry->val_str(&null_value, str, decimals);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3950 3951 3952
}


3953 3954 3955
my_decimal *Item_func_set_user_var::val_decimal(my_decimal *val)
{
  DBUG_ASSERT(fixed == 1);
3956
  check(0);
3957 3958 3959 3960 3961
  update();					// Store expression
  return entry->val_decimal(&null_value, val);
}


3962 3963
void Item_func_set_user_var::print(String *str)
{
3964
  str->append(STRING_WITH_LEN("(@"));
3965
  str->append(name.str, name.length);
3966
  str->append(STRING_WITH_LEN(":="));
3967 3968 3969 3970 3971
  args[0]->print(str);
  str->append(')');
}


3972 3973
void Item_func_set_user_var::print_as_stmt(String *str)
{
3974
  str->append(STRING_WITH_LEN("set @"));
3975
  str->append(name.str, name.length);
3976
  str->append(STRING_WITH_LEN(":="));
3977 3978 3979 3980
  args[0]->print(str);
  str->append(')');
}

3981 3982 3983 3984 3985 3986 3987 3988 3989 3990
bool Item_func_set_user_var::send(Protocol *protocol, String *str_arg)
{
  if (result_field)
  {
    check(1);
    update();
    return protocol->store(result_field);
  }
  return Item::send(protocol, str_arg);
}
3991

3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003
void Item_func_set_user_var::make_field(Send_field *tmp_field)
{
  if (result_field)
  {
    result_field->make_field(tmp_field);
    DBUG_ASSERT(tmp_field->table_name != 0);
    if (Item::name)
      tmp_field->col_name=Item::name;               // Use user supplied name
  }
  else
    Item::make_field(tmp_field);
}
4004

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4005 4006 4007
String *
Item_func_get_user_var::val_str(String *str)
{
4008
  DBUG_ASSERT(fixed == 1);
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
4009
  DBUG_ENTER("Item_func_get_user_var::val_str");
4010
  if (!var_entry)
4011
    DBUG_RETURN((String*) 0);			// No such variable
4012
  DBUG_RETURN(var_entry->val_str(&null_value, str, decimals));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4013 4014 4015
}


4016
double Item_func_get_user_var::val_real()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4017
{
4018
  DBUG_ASSERT(fixed == 1);
4019 4020
  if (!var_entry)
    return 0.0;					// No such variable
4021 4022 4023 4024 4025 4026 4027 4028 4029 4030
  return (var_entry->val_real(&null_value));
}


my_decimal *Item_func_get_user_var::val_decimal(my_decimal *dec)
{
  DBUG_ASSERT(fixed == 1);
  if (!var_entry)
    return 0;
  return var_entry->val_decimal(&null_value, dec);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4031 4032 4033 4034 4035
}


longlong Item_func_get_user_var::val_int()
{
4036
  DBUG_ASSERT(fixed == 1);
4037 4038 4039
  if (!var_entry)
    return LL(0);				// No such variable
  return (var_entry->val_int(&null_value));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4040 4041 4042
}


4043
/*
4044 4045 4046 4047 4048 4049 4050 4051 4052 4053
  Get variable by name and, if necessary, put the record of variable 
  use into the binary log.
  
  SYNOPSIS
    get_var_with_binlog()
      thd        Current thread
      name       Variable name 
      out_entry  [out] variable structure or NULL. The pointer is set 
                 regardless of whether function succeeded or not.

4054 4055 4056 4057
  When a user variable is invoked from an update query (INSERT, UPDATE etc),
  stores this variable and its value in thd->user_var_events, so that it can be
  written to the binlog (will be written just before the query is written, see
  log.cc).
4058

4059
  RETURN
4060
    0  OK
4061
    1  Failed to put appropriate record into binary log
4062

4063 4064
*/

4065 4066
int get_var_with_binlog(THD *thd, enum_sql_command sql_command,
                        LEX_STRING &name, user_var_entry **out_entry)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4067
{
4068
  BINLOG_USER_VAR_EVENT *user_var_event;
4069 4070
  user_var_entry *var_entry;
  var_entry= get_variable(&thd->user_vars, name, 0);
4071 4072

  if (!(opt_bin_log && is_update_query(sql_command)))
4073 4074 4075 4076
  {
    *out_entry= var_entry;
    return 0;
  }
4077 4078

  if (!var_entry)
4079
  {
4080
    /*
4081 4082 4083 4084
      If the variable does not exist, it's NULL, but we want to create it so
      that it gets into the binlog (if it didn't, the slave could be
      influenced by a variable of the same name previously set by another
      thread).
4085 4086
      We create it like if it had been explicitly set with SET before.
      The 'new' mimics what sql_yacc.yy does when 'SET @a=10;'.
4087 4088 4089
      sql_set_variables() is what is called from 'case SQLCOM_SET_OPTION'
      in dispatch_command()). Instead of building a one-element list to pass to
      sql_set_variables(), we could instead manually call check() and update();
4090 4091
      this would save memory and time; but calling sql_set_variables() makes
      one unique place to maintain (sql_set_variables()). 
4092 4093 4094

      Manipulation with lex is necessary since free_underlaid_joins
      is going to release memory belonging to the main query.
4095 4096 4097
    */

    List<set_var_base> tmp_var_list;
4098 4099 4100
    LEX *sav_lex= thd->lex, lex_tmp;
    thd->lex= &lex_tmp;
    lex_start(thd, NULL, 0);
4101 4102
    tmp_var_list.push_back(new set_var_user(new Item_func_set_user_var(name,
                                                                       new Item_null())));
4103 4104
    /* Create the variable */
    if (sql_set_variables(thd, &tmp_var_list))
4105 4106
    {
      thd->lex= sav_lex;
4107
      goto err;
4108 4109
    }
    thd->lex= sav_lex;
4110 4111 4112
    if (!(var_entry= get_variable(&thd->user_vars, name, 0)))
      goto err;
  }
4113 4114
  else if (var_entry->used_query_id == thd->query_id ||
           mysql_bin_log.is_query_in_union(thd, var_entry->used_query_id))
4115 4116 4117 4118 4119 4120 4121 4122 4123
  {
    /* 
       If this variable was already stored in user_var_events by this query
       (because it's used in more than one place in the query), don't store
       it.
    */
    *out_entry= var_entry;
    return 0;
  }
4124 4125 4126 4127

  uint size;
  /*
    First we need to store value of var_entry, when the next situation
4128
    appears:
4129 4130
    > set @a:=1;
    > insert into t1 values (@a), (@a:=@a+1), (@a:=@a+1);
4131 4132 4133 4134 4135 4136
    We have to write to binlog value @a= 1.
    
    We allocate the user_var_event on user_var_events_alloc pool, not on
    the this-statement-execution pool because in SPs user_var_event objects 
    may need to be valid after current [SP] statement execution pool is
    destroyed.
4137
  */
4138 4139 4140
  size= ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT)) + var_entry->length;
  if (!(user_var_event= (BINLOG_USER_VAR_EVENT *)
        alloc_root(thd->user_var_events_alloc, size)))
4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152
    goto err;
  
  user_var_event->value= (char*) user_var_event +
    ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT));
  user_var_event->user_var_event= var_entry;
  user_var_event->type= var_entry->type;
  user_var_event->charset_number= var_entry->collation.collation->number;
  if (!var_entry->value)
  {
    /* NULL value*/
    user_var_event->length= 0;
    user_var_event->value= 0;
4153
  }
4154 4155 4156 4157 4158 4159 4160 4161 4162 4163
  else
  {
    user_var_event->length= var_entry->length;
    memcpy(user_var_event->value, var_entry->value,
           var_entry->length);
  }
  /* Mark that this variable has been used by this query */
  var_entry->used_query_id= thd->query_id;
  if (insert_dynamic(&thd->user_var_events, (gptr) &user_var_event))
    goto err;
4164 4165 4166
  
  *out_entry= var_entry;
  return 0;
4167

4168
err:
4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180
  *out_entry= var_entry;
  return 1;
}


void Item_func_get_user_var::fix_length_and_dec()
{
  THD *thd=current_thd;
  int error;
  maybe_null=1;
  decimals=NOT_FIXED_DEC;
  max_length=MAX_BLOB_WIDTH;
4181

4182
  error= get_var_with_binlog(thd, thd->lex->sql_command, name, &var_entry);
4183 4184

  if (var_entry)
4185
  {
4186
    collation.set(var_entry->collation);
4187 4188 4189
    switch (var_entry->type) {
    case REAL_RESULT:
      max_length= DBL_DIG + 8;
4190
      break;
4191 4192
    case INT_RESULT:
      max_length= MAX_BIGINT_WIDTH;
4193
      decimals=0;
4194 4195 4196 4197
      break;
    case STRING_RESULT:
      max_length= MAX_BLOB_WIDTH;
      break;
4198
    case DECIMAL_RESULT:
4199 4200
      max_length= DECIMAL_MAX_STR_LENGTH;
      decimals= DECIMAL_MAX_SCALE;
4201
      break;
monty@mysql.com's avatar
monty@mysql.com committed
4202
    case ROW_RESULT:                            // Keep compiler happy
4203 4204
    default:
      DBUG_ASSERT(0);
monty@mysql.com's avatar
monty@mysql.com committed
4205
      break;
4206 4207
    }
  }
4208
  else
4209 4210
  {
    collation.set(&my_charset_bin, DERIVATION_IMPLICIT);
4211
    null_value= 1;
4212
  }
4213

4214 4215
  if (error)
    thd->fatal_error();
4216

4217
  return;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4218 4219 4220
}


4221
bool Item_func_get_user_var::const_item() const
4222
{
4223
  return (!var_entry || current_thd->query_id != var_entry->update_query_id);
4224
}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236


enum Item_result Item_func_get_user_var::result_type() const
{
  user_var_entry *entry;
  if (!(entry = (user_var_entry*) hash_search(&current_thd->user_vars,
					      (byte*) name.str,
					      name.length)))
    return STRING_RESULT;
  return entry->type;
}

4237 4238 4239

void Item_func_get_user_var::print(String *str)
{
4240
  str->append(STRING_WITH_LEN("(@"));
4241 4242 4243 4244
  str->append(name.str,name.length);
  str->append(')');
}

4245

4246
bool Item_func_get_user_var::eq(const Item *item, bool binary_cmp) const
4247 4248 4249 4250 4251 4252
{
  /* Assume we don't have rtti */
  if (this == item)
    return 1;					// Same item is same.
  /* Check if other type is also a get_user_var() object */
  if (item->type() != FUNC_ITEM ||
4253
      ((Item_func*) item)->functype() != functype())
4254 4255 4256 4257 4258 4259 4260
    return 0;
  Item_func_get_user_var *other=(Item_func_get_user_var*) item;
  return (name.length == other->name.length &&
	  !memcmp(name.str, other->name.str, name.length));
}


4261
bool Item_func_get_user_var::set_value(THD *thd,
4262
                                       sp_rcontext */*ctx*/, Item **it)
4263
{
4264
  Item_func_set_user_var *suv= new Item_func_set_user_var(get_name(), *it);
4265 4266 4267 4268
  /*
    Item_func_set_user_var is not fixed after construction, call
    fix_fields().
  */
4269
  return (!suv || suv->fix_fields(thd, it) || suv->check(0) || suv->update());
4270 4271 4272
}


4273
bool Item_user_var_as_out_param::fix_fields(THD *thd, Item **ref)
4274 4275
{
  DBUG_ASSERT(fixed == 0);
4276
  if (Item::fix_fields(thd, ref) ||
4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293
      !(entry= get_variable(&thd->user_vars, name, 1)))
    return TRUE;
  entry->type= STRING_RESULT;
  /*
    Let us set the same collation which is used for loading
    of fields in LOAD DATA INFILE.
    (Since Item_user_var_as_out_param is used only there).
  */
  entry->collation.set(thd->variables.collation_database);
  entry->update_query_id= thd->query_id;
  return FALSE;
}


void Item_user_var_as_out_param::set_null_value(CHARSET_INFO* cs)
{
  if (::update_hash(entry, TRUE, 0, 0, STRING_RESULT, cs,
4294
                    DERIVATION_IMPLICIT, 0 /* unsigned_arg */))
4295 4296 4297 4298 4299 4300 4301 4302
    current_thd->fatal_error();			// Probably end of memory
}


void Item_user_var_as_out_param::set_value(const char *str, uint length,
                                           CHARSET_INFO* cs)
{
  if (::update_hash(entry, FALSE, (void*)str, length, STRING_RESULT, cs,
4303
                    DERIVATION_IMPLICIT, 0 /* unsigned_arg */))
4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342
    current_thd->fatal_error();			// Probably end of memory
}


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


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


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


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


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


4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354
Item_func_get_system_var::
Item_func_get_system_var(sys_var *var_arg, enum_var_type var_type_arg,
                       LEX_STRING *component_arg, const char *name_arg,
                       size_t name_len_arg)
  :var(var_arg), var_type(var_type_arg), component(*component_arg)
{
  /* set_name() will allocate the name */
  set_name(name_arg, name_len_arg, system_charset_info);
}


bool
4355
Item_func_get_system_var::fix_fields(THD *thd, Item **ref)
4356
{
4357
  Item *item;
4358
  DBUG_ENTER("Item_func_get_system_var::fix_fields");
4359

4360 4361 4362 4363 4364
  /*
    Evaluate the system variable and substitute the result (a basic constant)
    instead of this item. If the variable can not be evaluated,
    the error is reported in sys_var::item().
  */
4365
  if (!(item= var->item(thd, var_type, &component)))
4366 4367 4368 4369 4370 4371 4372 4373
    DBUG_RETURN(1);                             // Impossible
  item->set_name(name, 0, system_charset_info); // don't allocate a new name
  thd->change_item_tree(ref, item);

  DBUG_RETURN(0);
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
4374 4375
longlong Item_func_inet_aton::val_int()
{
4376
  DBUG_ASSERT(fixed == 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4377 4378 4379 4380 4381
  uint byte_result = 0;
  ulonglong result = 0;			// We are ready for 64 bit addresses
  const char *p,* end;
  char c = '.'; // we mark c to indicate invalid IP in case length is 0
  char buff[36];
4382
  int dot_count= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4383

4384
  String *s,tmp(buff,sizeof(buff),&my_charset_bin);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400
  if (!(s = args[0]->val_str(&tmp)))		// If null value
    goto err;
  null_value=0;

  end= (p = s->ptr()) + s->length();
  while (p < end)
  {
    c = *p++;
    int digit = (int) (c - '0');		// Assume ascii
    if (digit >= 0 && digit <= 9)
    {
      if ((byte_result = byte_result * 10 + digit) > 255)
	goto err;				// Wrong address
    }
    else if (c == '.')
    {
4401
      dot_count++;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4402 4403 4404 4405 4406 4407 4408
      result= (result << 8) + (ulonglong) byte_result;
      byte_result = 0;
    }
    else
      goto err;					// Invalid character
  }
  if (c != '.')					// IP number can't end on '.'
4409
  {
4410 4411 4412 4413 4414 4415
    /*
      Handle short-forms addresses according to standard. Examples:
      127		-> 0.0.0.127
      127.1		-> 127.0.0.1
      127.2.1		-> 127.2.0.1
    */
4416
    switch (dot_count) {
4417 4418
    case 1: result<<= 8; /* Fall through */
    case 2: result<<= 8; /* Fall through */
4419
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4420
    return (result << 8) + (ulonglong) byte_result;
4421
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4422 4423 4424 4425 4426 4427

err:
  null_value=1;
  return 0;
}

4428

4429
void Item_func_match::init_search(bool no_order)
4430
{
4431
  DBUG_ENTER("Item_func_match::init_search");
4432 4433

  /* Check if init_search() has been called before */
4434
  if (ft_handler)
4435
    DBUG_VOID_RETURN;
4436

4437
  if (key == NO_SUCH_KEY)
4438 4439
  {
    List<Item> fields;
4440
    fields.push_back(new Item_string(" ",1, cmp_collation.collation));
4441 4442
    for (uint i=1; i < arg_count; i++)
      fields.push_back(args[i]);
4443
    concat=new Item_func_concat_ws(fields);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4444 4445 4446
    /*
      Above function used only to get value and do not need fix_fields for it:
      Item_string - basic constant
monty@mysql.com's avatar
monty@mysql.com committed
4447 4448
      fields - fix_fields() was already called for this arguments
      Item_func_concat_ws - do not need fix_fields() to produce value
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4449 4450
    */
    concat->quick_fix_field();
4451
  }
4452

4453 4454
  if (master)
  {
4455 4456
    join_key=master->join_key=join_key|master->join_key;
    master->init_search(no_order);
4457 4458
    ft_handler=master->ft_handler;
    join_key=master->join_key;
4459
    DBUG_VOID_RETURN;
4460 4461
  }

monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
4462
  String *ft_tmp= 0;
4463

4464
  // MATCH ... AGAINST (NULL) is meaningless, but possible
4465
  if (!(ft_tmp=key_item()->val_str(&value)))
4466
  {
4467 4468
    ft_tmp= &value;
    value.set("",0,cmp_collation.collation);
4469 4470
  }

4471 4472
  if (ft_tmp->charset() != cmp_collation.collation)
  {
4473
    uint dummy_errors;
4474
    search_value.copy(ft_tmp->ptr(), ft_tmp->length(), ft_tmp->charset(),
4475
                      cmp_collation.collation, &dummy_errors);
4476
    ft_tmp= &search_value;
4477 4478
  }

4479 4480
  if (join_key && !no_order)
    flags|=FT_SORTED;
4481
  ft_handler=table->file->ft_init_ext(flags, key, ft_tmp);
4482 4483 4484

  if (join_key)
    table->file->ft_handler=ft_handler;
4485 4486

  DBUG_VOID_RETURN;
4487 4488
}

4489

4490
bool Item_func_match::fix_fields(THD *thd, Item **ref)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4491
{
4492
  DBUG_ASSERT(fixed == 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4493
  Item *item;
4494
  LINT_INIT(item);				// Safe as arg_count is > 1
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4495

4496 4497 4498
  maybe_null=1;
  join_key=0;

4499 4500 4501 4502 4503
  /*
    const_item is assumed in quite a bit of places, so it would be difficult
    to remove;  If it would ever to be removed, this should include
    modifications to find_best and auto_close as complement to auto_init code
    above.
4504
   */
4505
  if (Item_func::fix_fields(thd, ref) ||
4506
      !args[0]->const_during_execution())
4507 4508
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"AGAINST");
4509
    return TRUE;
4510
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4511

4512 4513
  const_item_cache=0;
  for (uint i=1 ; i < arg_count ; i++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4514
  {
4515
    item=args[i];
serg@serg.mysql.com's avatar
serg@serg.mysql.com committed
4516
    if (item->type() == Item::REF_ITEM)
4517 4518
      args[i]= item= *((Item_ref *)item)->ref;
    if (item->type() != Item::FIELD_ITEM)
4519
      key=NO_SUCH_KEY;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4520
  }
4521 4522
  /*
    Check that all columns come from the same table.
4523
    We've already checked that columns in MATCH are fields so
4524 4525 4526
    PARAM_TABLE_BIT can only appear from AGAINST argument.
  */
  if ((used_tables_cache & ~PARAM_TABLE_BIT) != item->used_tables())
4527
    key=NO_SUCH_KEY;
4528

4529
  if (key == NO_SUCH_KEY && !(flags & FT_BOOL))
4530 4531
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"MATCH");
4532
    return TRUE;
4533
  }
4534
  table=((Item_field *)item)->field->table;
4535
  if (!(table->file->ha_table_flags() & HA_CAN_FULLTEXT))
4536
  {
monty@mysql.com's avatar
monty@mysql.com committed
4537
    my_error(ER_TABLE_CANT_HANDLE_FT, MYF(0));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4538
    return 1;
4539
  }
4540
  table->fulltext_searched=1;
4541 4542
  return agg_arg_collations_for_comparison(cmp_collation,
                                           args+1, arg_count-1, 0);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4543
}
4544

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4545 4546 4547
bool Item_func_match::fix_index()
{
  Item_field *item;
4548
  uint ft_to_key[MAX_KEY], ft_cnt[MAX_KEY], fts=0, keynr;
4549
  uint max_cnt=0, mkeys=0, i;
4550

4551
  if (key == NO_SUCH_KEY)
4552
    return 0;
4553 4554 4555
  
  if (!table) 
    goto err;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4556

4557
  for (keynr=0 ; keynr < table->s->keys ; keynr++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4558
  {
4559
    if ((table->key_info[keynr].flags & HA_FULLTEXT) &&
4560
        (table->keys_in_use_for_query.is_set(keynr)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4561
    {
4562
      ft_to_key[fts]=keynr;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4563 4564 4565 4566 4567 4568
      ft_cnt[fts]=0;
      fts++;
    }
  }

  if (!fts)
4569
    goto err;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4570

4571
  for (i=1; i < arg_count; i++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4572
  {
4573
    item=(Item_field*)args[i];
4574
    for (keynr=0 ; keynr < fts ; keynr++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4575
    {
4576
      KEY *ft_key=&table->key_info[ft_to_key[keynr]];
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4577 4578 4579 4580 4581
      uint key_parts=ft_key->key_parts;

      for (uint part=0 ; part < key_parts ; part++)
      {
	if (item->field->eq(ft_key->key_part[part].field))
4582
	  ft_cnt[keynr]++;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4583 4584 4585 4586
      }
    }
  }

4587
  for (keynr=0 ; keynr < fts ; keynr++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4588
  {
4589
    if (ft_cnt[keynr] > max_cnt)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4590
    {
4591
      mkeys=0;
4592 4593
      max_cnt=ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
4594 4595
      continue;
    }
4596
    if (max_cnt && ft_cnt[keynr] == max_cnt)
4597 4598
    {
      mkeys++;
4599 4600
      ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
4601
      continue;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4602 4603 4604
    }
  }

4605
  for (keynr=0 ; keynr <= mkeys ; keynr++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4606
  {
4607 4608
    // partial keys doesn't work
    if (max_cnt < arg_count-1 ||
4609
        max_cnt < table->key_info[ft_to_key[keynr]].key_parts)
4610
      continue;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4611

4612
    key=ft_to_key[keynr];
4613

4614 4615 4616
    return 0;
  }

4617
err:
4618
  if (flags & FT_BOOL)
4619
  {
4620
    key=NO_SUCH_KEY;
4621 4622
    return 0;
  }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4623 4624
  my_message(ER_FT_MATCHING_KEY_NOT_FOUND,
             ER(ER_FT_MATCHING_KEY_NOT_FOUND), MYF(0));
4625
  return 1;
4626 4627
}

4628

4629
bool Item_func_match::eq(const Item *item, bool binary_cmp) const
4630
{
4631 4632
  if (item->type() != FUNC_ITEM ||
      ((Item_func*)item)->functype() != FT_FUNC ||
4633
      flags != ((Item_func_match*)item)->flags)
4634 4635 4636 4637 4638
    return 0;

  Item_func_match *ifm=(Item_func_match*) item;

  if (key == ifm->key && table == ifm->table &&
4639
      key_item()->eq(ifm->key_item(), binary_cmp))
4640
    return 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4641 4642 4643 4644

  return 0;
}

4645

4646
double Item_func_match::val_real()
4647
{
4648
  DBUG_ASSERT(fixed == 1);
4649
  DBUG_ENTER("Item_func_match::val");
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4650
  if (ft_handler == NULL)
4651
    DBUG_RETURN(-1.0);
4652

4653
  if (key != NO_SUCH_KEY && table->null_row) /* NULL row from an outer join */
monty@mysql.com's avatar
monty@mysql.com committed
4654
    DBUG_RETURN(0.0);
4655

4656 4657 4658
  if (join_key)
  {
    if (table->file->ft_handler)
4659
      DBUG_RETURN(ft_handler->please->get_relevance(ft_handler));
4660 4661 4662
    join_key=0;
  }

4663
  if (key == NO_SUCH_KEY)
4664
  {
4665 4666
    String *a= concat->val_str(&value);
    if ((null_value= (a == 0)))
4667 4668 4669
      DBUG_RETURN(0);
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
				      (byte *)a->ptr(), a->length()));
4670
  }
monty@mysql.com's avatar
monty@mysql.com committed
4671 4672
  DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
                                                 table->record[0], 0));
4673 4674
}

4675 4676
void Item_func_match::print(String *str)
{
4677
  str->append(STRING_WITH_LEN("(match "));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4678
  print_args(str, 1);
4679
  str->append(STRING_WITH_LEN(" against ("));
4680
  args[0]->print(str);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4681
  if (flags & FT_BOOL)
4682
    str->append(STRING_WITH_LEN(" in boolean mode"));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4683
  else if (flags & FT_EXPAND)
4684 4685
    str->append(STRING_WITH_LEN(" with query expansion"));
  str->append(STRING_WITH_LEN("))"));
4686
}
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
4687

4688 4689
longlong Item_func_bit_xor::val_int()
{
4690
  DBUG_ASSERT(fixed == 1);
4691 4692
  ulonglong arg1= (ulonglong) args[0]->val_int();
  ulonglong arg2= (ulonglong) args[1]->val_int();
4693
  if ((null_value= (args[0]->null_value || args[1]->null_value)))
4694 4695 4696 4697
    return 0;
  return (longlong) (arg1 ^ arg2);
}

4698

4699 4700 4701 4702
/***************************************************************************
  System variables
****************************************************************************/

4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719
/*
  Return value of an system variable base[.name] as a constant item

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

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

  RETURN
    0	error
    #	constant item
*/
4720

4721 4722 4723

Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
		     LEX_STRING component)
4724
{
4725 4726 4727
  sys_var *var;
  LEX_STRING *base_name, *component_name;

4728 4729 4730 4731 4732 4733 4734 4735 4736 4737
  if (component.str)
  {
    base_name= &component;
    component_name= &name;
  }
  else
  {
    base_name= &name;
    component_name= &component;			// Empty string
  }
4738

4739
  if (!(var= find_sys_var(base_name->str, base_name->length)))
4740
    return 0;
4741 4742 4743 4744
  if (component.str)
  {
    if (!var->is_struct())
    {
4745
      my_error(ER_VARIABLE_IS_NOT_STRUCT, MYF(0), base_name->str);
4746 4747 4748
      return 0;
    }
  }
pem@mysql.com's avatar
pem@mysql.com committed
4749
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
4750

4751 4752
  set_if_smaller(component_name->length, MAX_SYS_VAR_LENGTH);

4753
  return new Item_func_get_system_var(var, var_type, component_name,
4754
                                      NULL, 0);
4755 4756 4757
}


4758 4759
/*
  Check a user level lock.
4760 4761 4762 4763 4764 4765 4766 4767

  SYNOPSIS:
    val_int()

  RETURN VALUES
    1		Available
    0		Already taken
    NULL	Error
4768 4769
*/

4770
longlong Item_func_is_free_lock::val_int()
4771
{
4772
  DBUG_ASSERT(fixed == 1);
4773
  String *res=args[0]->val_str(&value);
4774
  User_level_lock *ull;
4775 4776

  null_value=0;
4777
  if (!res || !res->length())
4778 4779 4780 4781 4782 4783
  {
    null_value=1;
    return 0;
  }
  
  pthread_mutex_lock(&LOCK_user_locks);
4784
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
4785 4786 4787 4788 4789 4790
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 1;
  return 0;
}
4791

hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
4792 4793
longlong Item_func_is_used_lock::val_int()
{
4794
  DBUG_ASSERT(fixed == 1);
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
4795
  String *res=args[0]->val_str(&value);
4796
  User_level_lock *ull;
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
4797 4798 4799 4800 4801 4802

  null_value=1;
  if (!res || !res->length())
    return 0;
  
  pthread_mutex_lock(&LOCK_user_locks);
4803
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
4804 4805 4806 4807 4808 4809 4810 4811 4812
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 0;

  null_value=0;
  return ull->thread_id;
}

4813

4814 4815 4816 4817 4818 4819 4820 4821 4822
longlong Item_func_row_count::val_int()
{
  DBUG_ASSERT(fixed == 1);
  THD *thd= current_thd;

  return thd->row_count_func;
}


4823 4824 4825
Item_func_sp::Item_func_sp(Name_resolution_context *context_arg, sp_name *name)
  :Item_func(), context(context_arg), m_name(name), m_sp(NULL),
   result_field(NULL)
4826
{
4827
  maybe_null= 1;
4828
  m_name->init_qname(current_thd);
4829 4830
  dummy_table= (TABLE*) sql_calloc(sizeof(TABLE)+ sizeof(TABLE_SHARE));
  dummy_table->s= (TABLE_SHARE*) (dummy_table+1);
4831 4832
}

monty@mysql.com's avatar
monty@mysql.com committed
4833

4834 4835 4836 4837
Item_func_sp::Item_func_sp(Name_resolution_context *context_arg,
                           sp_name *name, List<Item> &list)
  :Item_func(list), context(context_arg), m_name(name), m_sp(NULL),
   result_field(NULL)
4838
{
4839
  maybe_null= 1;
4840
  m_name->init_qname(current_thd);
4841 4842
  dummy_table= (TABLE*) sql_calloc(sizeof(TABLE)+ sizeof(TABLE_SHARE));
  dummy_table->s= (TABLE_SHARE*) (dummy_table+1);
4843 4844
}

4845

4846 4847 4848 4849 4850 4851 4852 4853
void
Item_func_sp::cleanup()
{
  if (result_field)
  {
    delete result_field;
    result_field= NULL;
  }
4854
  m_sp= NULL;
4855
  dummy_table->alias= NULL;
4856 4857
  Item_func::cleanup();
}
monty@mysql.com's avatar
monty@mysql.com committed
4858

4859 4860 4861
const char *
Item_func_sp::func_name() const
{
4862
  THD *thd= current_thd;
4863
  /* Calculate length to avoid reallocation of string for sure */
4864 4865 4866 4867
  uint len= ((m_name->m_db.length +
              m_name->m_name.length)*2 + //characters*quoting
             2 +                         // ` and `
             1 +                         // .
4868 4869
             1 +                         // end of string
             ALIGN_SIZE(1));             // to avoid String reallocation
monty@mysql.com's avatar
monty@mysql.com committed
4870
  String qname((char *)alloc_root(thd->mem_root, len), len,
4871
               system_charset_info);
4872

4873 4874 4875 4876 4877
  qname.length(0);
  append_identifier(thd, &qname, m_name->m_db.str, m_name->m_db.length);
  qname.append('.');
  append_identifier(thd, &qname, m_name->m_name.str, m_name->m_name.length);
  return qname.ptr();
4878 4879
}

4880

4881 4882 4883
Field *
Item_func_sp::sp_result_field(void) const
{
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4884
  Field *field;
4885
  DBUG_ENTER("Item_func_sp::sp_result_field");
4886 4887 4888 4889
  DBUG_PRINT("info", ("sp: %s, flags: %x, level: %lu",
                      (m_sp ? "YES" : "NO"),
                      (m_sp ? m_sp->m_flags : (uint)0),
                      (m_sp ? m_sp->m_recursion_level : (ulong)0)));
4890 4891

  if (!m_sp)
4892
  {
4893 4894 4895
    THD *thd= current_thd;
    if (!(m_sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, m_name,
                                &thd->sp_func_cache, TRUE)))
4896
    {
4897 4898
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
      DBUG_RETURN(0);
4899 4900
    }
  }
4901
  if (!dummy_table->alias)
4902 4903
  {
    char *empty_name= (char *) "";
4904 4905
    dummy_table->alias= empty_name;
    dummy_table->maybe_null= maybe_null;
4906
    dummy_table->in_use= current_thd;
4907
    dummy_table->copy_blobs= TRUE;
4908 4909 4910
    dummy_table->s->table_cache_key.str = empty_name;
    dummy_table->s->table_name.str= empty_name;
    dummy_table->s->db.str= empty_name;
4911
  }
4912 4913 4914
  if (!(field= m_sp->create_result_field(max_length, name, dummy_table)))
    my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));

4915
  DBUG_RETURN(field);
4916 4917 4918
}


4919 4920 4921 4922 4923 4924 4925 4926
/*
  Execute function & store value in field

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

4927
bool
4928 4929
Item_func_sp::execute(Field **flp)
{
4930
  THD *thd= current_thd;
4931
  Field *f;
4932 4933 4934 4935 4936 4937

  /*
    Get field in virtual tmp table to store result. Create the field if
    invoked first time.
  */
  
4938 4939
  if (!(f= *flp))
  {
4940 4941
    if (!(*flp= f= sp_result_field()))
    {
4942 4943 4944
      /* Error set by sp_result_field() */
      null_value= 1;
      return TRUE;
4945 4946 4947
    }

    f->move_field((f->pack_length() > sizeof(result_buf)) ?
4948 4949 4950 4951
                  sql_alloc(f->pack_length()) : result_buf);
    f->null_ptr= (uchar *)&null_value;
    f->null_bit= 1;
  }
4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966

  /* Execute function and store the return value in the field. */

  if (execute_impl(thd, f))
  {
    null_value= 1;
    context->process_error(thd);
    return TRUE;
  }

  /* Check that the field (the value) is not NULL. */

  null_value= f->is_null();

  return null_value;
4967 4968 4969
}


4970 4971
bool
Item_func_sp::execute_impl(THD *thd, Field *return_value_fld)
4972
{
4973
  bool err_status= TRUE;
4974
  Sub_statement_state statement_state;
4975 4976 4977
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  Security_context *save_security_ctx= thd->security_ctx;
#endif
4978

4979 4980
  DBUG_ENTER("Item_func_sp::execute_impl");

4981 4982 4983 4984 4985 4986 4987
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (context->security_ctx)
  {
    /* Set view definer security context */
    thd->security_ctx= context->security_ctx;
  }
#endif
4988
  if (find_and_check_access(thd))
4989
    goto error;
4990

4991 4992 4993 4994 4995
  /*
    Disable the binlogging if this is not a SELECT statement. If this is a
    SELECT, leave binlogging on, so execute_function() code writes the
    function call into binlog.
  */
4996
  thd->reset_sub_statement_state(&statement_state, SUB_STMT_FUNCTION);
4997
  err_status= m_sp->execute_function(thd, args, arg_count, return_value_fld);
4998
  thd->restore_sub_statement_state(&statement_state);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4999

5000
error:
5001
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5002
  thd->security_ctx= save_security_ctx;
5003
#endif
5004

5005
  DBUG_RETURN(err_status);
5006 5007
}

5008

5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024
void
Item_func_sp::make_field(Send_field *tmp_field)
{
  Field *field;
  DBUG_ENTER("Item_func_sp::make_field");
  if ((field= sp_result_field()))
  {
    field->make_field(tmp_field);
    delete field;
    DBUG_VOID_RETURN;
  }
  init_make_field(tmp_field, MYSQL_TYPE_VARCHAR);  
  DBUG_VOID_RETURN;
}


5025 5026
enum enum_field_types
Item_func_sp::field_type() const
5027
{
5028
  Field *field;
5029
  DBUG_ENTER("Item_func_sp::field_type");
5030

5031 5032
  if (result_field)
    DBUG_RETURN(result_field->type());
5033
  if ((field= sp_result_field()))
5034
  {
5035 5036 5037
    enum_field_types result= field->type();
    delete field;
    DBUG_RETURN(result);
5038
  }
5039
  DBUG_RETURN(MYSQL_TYPE_VARCHAR);
5040 5041
}

5042

5043 5044
Item_result
Item_func_sp::result_type() const
5045
{
5046
  Field *field;
5047 5048
  DBUG_ENTER("Item_func_sp::result_type");
  DBUG_PRINT("info", ("m_sp = %p", m_sp));
5049

5050 5051
  if (result_field)
    DBUG_RETURN(result_field->result_type());
5052
  if ((field= sp_result_field()))
5053
  {
5054 5055 5056
    Item_result result= field->result_type();
    delete field;
    DBUG_RETURN(result);
5057
  }
5058
  DBUG_RETURN(STRING_RESULT);
5059 5060 5061 5062 5063
}

void
Item_func_sp::fix_length_and_dec()
{
5064
  Field *field;
5065 5066
  DBUG_ENTER("Item_func_sp::fix_length_and_dec");

5067 5068 5069
  if (result_field)
  {
    decimals= result_field->decimals();
5070
    max_length= result_field->field_length;
5071
    collation.set(result_field->charset());
5072 5073 5074
    DBUG_VOID_RETURN;
  }

5075
  if (!(field= sp_result_field()))
5076 5077
  {
    context->process_error(current_thd);
5078
    DBUG_VOID_RETURN;
5079
  }
5080
  decimals= field->decimals();
monty@mishka.local's avatar
merge  
monty@mishka.local committed
5081
  max_length= field->field_length;
5082
  collation.set(field->charset());
monty@mishka.local's avatar
merge  
monty@mishka.local committed
5083
  maybe_null= 1;
5084
  delete field;
5085 5086
  DBUG_VOID_RETURN;
}
monty@mysql.com's avatar
monty@mysql.com committed
5087 5088


5089 5090 5091
longlong Item_func_found_rows::val_int()
{
  DBUG_ASSERT(fixed == 1);
5092
  return current_thd->found_rows();
5093
}
5094

5095

5096 5097 5098
Field *
Item_func_sp::tmp_table_field(TABLE *t_arg)
{
5099
  Field *field= 0;
5100 5101 5102
  DBUG_ENTER("Item_func_sp::tmp_table_field");

  if (m_sp)
5103
    field= m_sp->create_result_field(max_length, (const char*) name, t_arg);
5104
  
5105 5106
  if (!field) 
    field= Item_func::tmp_table_field(t_arg);
5107

5108
  if (!field)
5109 5110
    my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));

5111
  DBUG_RETURN(field);
5112
}
5113

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5114

5115
/*
5116
  Find the function and check access rights to the function
5117 5118

  SYNOPSIS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5119 5120
    find_and_check_access()
    thd           thread handler
5121 5122

  RETURN
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5123 5124
    FALSE    Access granted
    TRUE     Requested access can't be granted or function doesn't exists
5125 5126 5127 5128 5129

  NOTES
    Checks if requested access to function can be granted to user.
    If function isn't found yet, it searches function first.
    If function can't be found or user don't have requested access
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5130
    error is raised.
5131
*/
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5132

5133
bool
5134
Item_func_sp::find_and_check_access(THD *thd)
5135
{
5136 5137
  if (! m_sp && ! (m_sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, m_name,
                                         &thd->sp_func_cache, TRUE)))
5138 5139
  {
    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
5140
    return TRUE;
5141 5142
  }

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5143
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5144
  if (check_routine_access(thd, EXECUTE_ACL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5145
			   m_sp->m_db.str, m_sp->m_name.str, 0, FALSE))
5146
    return TRUE;
5147
#endif
monty@mysql.com's avatar
monty@mysql.com committed
5148

5149
  return FALSE;
jonas@perch.ndb.mysql.com's avatar
jonas@perch.ndb.mysql.com committed
5150
}
5151

5152

5153 5154 5155 5156 5157 5158
bool
Item_func_sp::fix_fields(THD *thd, Item **ref)
{
  bool res;
  DBUG_ASSERT(fixed == 0);
  res= Item_func::fix_fields(thd, ref);
5159
  if (!res && thd->lex->view_prepare_mode)
monty@mysql.com's avatar
monty@mysql.com committed
5160
  {
5161 5162
    /*
      Here we check privileges of the stored routine only during view
5163 5164 5165 5166 5167 5168 5169
      creation, in order to validate the view.  A runtime check is
      perfomed in Item_func_sp::execute(), and this method is not
      called during context analysis.  Notice, that during view
      creation we do not infer into stored routine bodies and do not
      check privileges of its statements, which would probably be a
      good idea especially if the view has SQL SECURITY DEFINER and
      the used stored procedure has SQL SECURITY DEFINER.
5170
    */
5171 5172 5173 5174 5175 5176 5177 5178 5179
    res= find_and_check_access(thd);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    Security_context *save_secutiry_ctx;
    if (!res && !(res= set_routine_security_ctx(thd, m_sp, false,
                                                &save_secutiry_ctx)))
    {
      sp_restore_security_context(thd, save_secutiry_ctx);
    }
#endif /* ! NO_EMBEDDED_ACCESS_CHECKS */
monty@mysql.com's avatar
monty@mysql.com committed
5180
  }
5181 5182
  return res;
}