item_func.h 29.8 KB
Newer Older
unknown's avatar
unknown committed
1
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
2

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

unknown's avatar
unknown committed
8 9 10 11
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
12

unknown's avatar
unknown committed
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
   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 */


/* Function items used by mysql */

#ifdef __GNUC__
#pragma interface			/* gcc class implementation */
#endif

#ifdef HAVE_IEEEFP_H
extern "C"				/* Bug in BSDI include file */
{
#include <ieeefp.h>
}
#endif

class Item_func :public Item_result_field
{
protected:
34
  Item **args, *tmp_arg[2];
unknown's avatar
unknown committed
35
  uint allowed_arg_cols;
unknown's avatar
unknown committed
36 37
public:
  uint arg_count;
38
  table_map used_tables_cache, not_null_tables_cache;
unknown's avatar
unknown committed
39 40 41 42
  bool const_item_cache;
  enum Functype { UNKNOWN_FUNC,EQ_FUNC,EQUAL_FUNC,NE_FUNC,LT_FUNC,LE_FUNC,
		  GE_FUNC,GT_FUNC,FT_FUNC,
		  LIKE_FUNC,NOTLIKE_FUNC,ISNULL_FUNC,ISNOTNULL_FUNC,
43
		  COND_AND_FUNC, COND_OR_FUNC, COND_XOR_FUNC, BETWEEN, IN_FUNC,
44
		  INTERVAL_FUNC, ISNOTNULLTEST_FUNC,
unknown's avatar
unknown committed
45 46 47 48
		  SP_EQUALS_FUNC, SP_DISJOINT_FUNC,SP_INTERSECTS_FUNC,
		  SP_TOUCHES_FUNC,SP_CROSSES_FUNC,SP_WITHIN_FUNC,
		  SP_CONTAINS_FUNC,SP_OVERLAPS_FUNC,
		  SP_STARTPOINT,SP_ENDPOINT,SP_EXTERIORRING,
49
		  SP_POINTN,SP_GEOMETRYN,SP_INTERIORRINGN,
unknown's avatar
unknown committed
50 51
                  NOT_FUNC, NOT_ALL_FUNC,
                  NOW_FUNC, TRIG_COND_FUNC,
52
                  GUSERVAR_FUNC};
unknown's avatar
unknown committed
53 54 55
  enum optimize_type { OPTIMIZE_NONE,OPTIMIZE_KEY,OPTIMIZE_OP, OPTIMIZE_NULL };
  enum Type type() const { return FUNC_ITEM; }
  virtual enum Functype functype() const   { return UNKNOWN_FUNC; }
unknown's avatar
unknown committed
56 57
  Item_func(void):
    allowed_arg_cols(1), arg_count(0)
unknown's avatar
unknown committed
58
  {
59
    with_sum_func= 0;
unknown's avatar
unknown committed
60
  }
unknown's avatar
unknown committed
61 62
  Item_func(Item *a):
    allowed_arg_cols(1), arg_count(1)
unknown's avatar
unknown committed
63
  {
64
    args= tmp_arg;
65 66
    args[0]= a;
    with_sum_func= a->with_sum_func;
unknown's avatar
unknown committed
67
  }
unknown's avatar
unknown committed
68 69
  Item_func(Item *a,Item *b):
    allowed_arg_cols(1), arg_count(2)
unknown's avatar
unknown committed
70
  {
71
    args= tmp_arg;
72 73
    args[0]= a; args[1]= b;
    with_sum_func= a->with_sum_func || b->with_sum_func;
unknown's avatar
unknown committed
74
  }
unknown's avatar
unknown committed
75 76
  Item_func(Item *a,Item *b,Item *c):
    allowed_arg_cols(1)
unknown's avatar
unknown committed
77
  {
78 79
    arg_count= 0;
    if ((args= (Item**) sql_alloc(sizeof(Item*)*3)))
unknown's avatar
unknown committed
80
    {
81 82 83
      arg_count= 3;
      args[0]= a; args[1]= b; args[2]= c;
      with_sum_func= a->with_sum_func || b->with_sum_func || c->with_sum_func;
unknown's avatar
unknown committed
84 85
    }
  }
unknown's avatar
unknown committed
86 87
  Item_func(Item *a,Item *b,Item *c,Item *d):
    allowed_arg_cols(1)
unknown's avatar
unknown committed
88
  {
89 90
    arg_count= 0;
    if ((args= (Item**) sql_alloc(sizeof(Item*)*4)))
unknown's avatar
unknown committed
91
    {
92 93 94 95
      arg_count= 4;
      args[0]= a; args[1]= b; args[2]= c; args[3]= d;
      with_sum_func= a->with_sum_func || b->with_sum_func ||
	c->with_sum_func || d->with_sum_func;
unknown's avatar
unknown committed
96 97
    }
  }
unknown's avatar
unknown committed
98 99
  Item_func(Item *a,Item *b,Item *c,Item *d,Item* e):
    allowed_arg_cols(1)
unknown's avatar
unknown committed
100
  {
101 102
    arg_count= 5;
    if ((args= (Item**) sql_alloc(sizeof(Item*)*5)))
unknown's avatar
unknown committed
103
    {
104 105 106
      args[0]= a; args[1]= b; args[2]= c; args[3]= d; args[4]= e;
      with_sum_func= a->with_sum_func || b->with_sum_func ||
	c->with_sum_func || d->with_sum_func || e->with_sum_func ;
unknown's avatar
unknown committed
107 108 109
    }
  }
  Item_func(List<Item> &list);
110
  // Constructor used for Item_cond_and/or (see Item comment)
111
  Item_func(THD *thd, Item_func *item);
unknown's avatar
unknown committed
112
  bool fix_fields(THD *,struct st_table_list *, Item **ref);
unknown's avatar
unknown committed
113
  table_map used_tables() const;
114
  table_map not_null_tables() const;
unknown's avatar
unknown committed
115
  void update_used_tables();
116
  bool eq(const Item *item, bool binary_cmp) const;
unknown's avatar
unknown committed
117 118 119 120 121 122
  virtual optimize_type select_optimize() const { return OPTIMIZE_NONE; }
  virtual bool have_rev_func() const { return 0; }
  virtual Item *key_item() const { return args[0]; }
  virtual const char *func_name() const { return "?"; }
  virtual bool const_item() const { return const_item_cache; }
  inline Item **arguments() const { return args; }
123
  void set_arguments(List<Item> &list);
unknown's avatar
unknown committed
124 125
  inline uint argument_count() const { return arg_count; }
  inline void remove_arguments() { arg_count=0; }
126
  virtual void split_sum_func(Item **ref_pointer_array, List<Item> &fields);
unknown's avatar
unknown committed
127 128
  void print(String *str);
  void print_op(String *str);
unknown's avatar
unknown committed
129
  void print_args(String *str, uint from);
unknown's avatar
unknown committed
130
  void fix_num_length_and_dec();
131
  inline bool get_arg0_date(TIME *ltime, uint fuzzy_date)
unknown's avatar
unknown committed
132
  {
133
    return (null_value=args[0]->get_date(ltime, fuzzy_date));
unknown's avatar
unknown committed
134 135 136 137 138
  }
  inline bool get_arg0_time(TIME *ltime)
  {
    return (null_value=args[0]->get_time(ltime));
  }
unknown's avatar
unknown committed
139
  bool is_null() { (void) val_int(); return null_value; }
unknown's avatar
unknown committed
140
  friend class udf_handler;
141
  Field *tmp_table_field() { return result_field; }
142
  Field *tmp_table_field(TABLE *t_arg);
143
  Item *get_tmp_table_item(THD *thd);
unknown's avatar
unknown committed
144
  
145 146
  bool agg_arg_collations(DTCollation &c, Item **items, uint nitems);
  bool agg_arg_collations_for_comparison(DTCollation &c, Item **items, uint nitems);
unknown's avatar
unknown committed
147 148

  bool walk(Item_processor processor, byte *arg);
unknown's avatar
unknown committed
149 150 151 152 153 154 155 156 157 158 159
};


class Item_real_func :public Item_func
{
public:
  Item_real_func() :Item_func() {}
  Item_real_func(Item *a) :Item_func(a) {}
  Item_real_func(Item *a,Item *b) :Item_func(a,b) {}
  Item_real_func(List<Item> &list) :Item_func(list) {}
  String *val_str(String*str);
160
  longlong val_int() { DBUG_ASSERT(fixed == 1); return (longlong) val(); }
unknown's avatar
unknown committed
161 162 163 164
  enum Item_result result_type () const { return REAL_RESULT; }
  void fix_length_and_dec() { decimals=NOT_FIXED_DEC; max_length=float_length(decimals); }
};

165

unknown's avatar
unknown committed
166 167 168 169 170 171 172 173
class Item_num_func :public Item_func
{
 protected:
  Item_result hybrid_type;
public:
  Item_num_func(Item *a) :Item_func(a),hybrid_type(REAL_RESULT) {}
  Item_num_func(Item *a,Item *b) :Item_func(a,b),hybrid_type(REAL_RESULT) {}
  String *val_str(String*str);
174
  longlong val_int() { DBUG_ASSERT(fixed == 1); return (longlong) val(); }
unknown's avatar
unknown committed
175 176
  enum Item_result result_type () const { return hybrid_type; }
  void fix_length_and_dec() { fix_num_length_and_dec(); }
unknown's avatar
unknown committed
177
  bool is_null() { (void) val(); return null_value; }
unknown's avatar
unknown committed
178 179 180 181 182 183 184 185 186 187 188 189 190 191
};


class Item_num_op :public Item_func
{
 protected:
  Item_result hybrid_type;
 public:
  Item_num_op(Item *a,Item *b) :Item_func(a,b),hybrid_type(REAL_RESULT) {}
  String *val_str(String*str);
  void print(String *str) { print_op(str); }
  enum Item_result result_type () const { return hybrid_type; }
  void fix_length_and_dec() { fix_num_length_and_dec(); find_num_type(); }
  void find_num_type(void);
unknown's avatar
unknown committed
192
  bool is_null() { (void) val(); return null_value; }
unknown's avatar
unknown committed
193 194 195 196 197 198
};


class Item_int_func :public Item_func
{
public:
unknown's avatar
unknown committed
199 200 201 202 203
  Item_int_func() :Item_func() { max_length=21; }
  Item_int_func(Item *a) :Item_func(a) { max_length=21; }
  Item_int_func(Item *a,Item *b) :Item_func(a,b) { max_length=21; }
  Item_int_func(Item *a,Item *b,Item *c) :Item_func(a,b,c) { max_length=21; }
  Item_int_func(List<Item> &list) :Item_func(list) { max_length=21; }
204
  Item_int_func(THD *thd, Item_int_func *item) :Item_func(thd, item) {}
205
  double val() { DBUG_ASSERT(fixed == 1); return (double) val_int(); }
unknown's avatar
unknown committed
206 207
  String *val_str(String*str);
  enum Item_result result_type () const { return INT_RESULT; }
unknown's avatar
unknown committed
208
  void fix_length_and_dec() {}
unknown's avatar
unknown committed
209 210
};

211

212 213 214 215
class Item_func_signed :public Item_int_func
{
public:
  Item_func_signed(Item *a) :Item_int_func(a) {}
unknown's avatar
unknown committed
216 217 218 219 220 221 222 223 224 225 226 227
  double val()
  {
    double tmp= args[0]->val();
    null_value= args[0]->null_value;
    return tmp;
  }
  longlong val_int()
  {
    longlong tmp= args[0]->val_int();
    null_value= args[0]->null_value; 
    return tmp;
  }
228
  void fix_length_and_dec()
unknown's avatar
unknown committed
229
  { max_length=args[0]->max_length; unsigned_flag=0; }
230
  void print(String *str);
231 232
};

233

unknown's avatar
unknown committed
234
class Item_func_unsigned :public Item_func_signed
235 236
{
public:
unknown's avatar
unknown committed
237
  Item_func_unsigned(Item *a) :Item_func_signed(a) {}
238
  void fix_length_and_dec()
unknown's avatar
unknown committed
239
  { max_length=args[0]->max_length; unsigned_flag=1; }
240
  void print(String *str);
241 242 243
};


unknown's avatar
unknown committed
244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259
class Item_func_plus :public Item_num_op
{
public:
  Item_func_plus(Item *a,Item *b) :Item_num_op(a,b) {}
  const char *func_name() const { return "+"; }
  double val();
  longlong val_int();
};

class Item_func_minus :public Item_num_op
{
public:
  Item_func_minus(Item *a,Item *b) :Item_num_op(a,b) {}
  const char *func_name() const { return "-"; }
  double val();
  longlong val_int();
260
  void fix_length_and_dec();
unknown's avatar
unknown committed
261 262
};

263

unknown's avatar
unknown committed
264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
class Item_func_mul :public Item_num_op
{
public:
  Item_func_mul(Item *a,Item *b) :Item_num_op(a,b) {}
  const char *func_name() const { return "*"; }
  double val();
  longlong val_int();
};


class Item_func_div :public Item_num_op
{
public:
  Item_func_div(Item *a,Item *b) :Item_num_op(a,b) {}
  double val();
  longlong val_int();
  const char *func_name() const { return "/"; }
  void fix_length_and_dec();
};


285 286 287 288 289
class Item_func_int_div :public Item_num_op
{
public:
  Item_func_int_div(Item *a,Item *b) :Item_num_op(a,b)
  { hybrid_type=INT_RESULT; }
290
  double val() { DBUG_ASSERT(fixed == 1); return (double) val_int(); }
291 292 293 294 295 296
  longlong val_int();
  const char *func_name() const { return "DIV"; }
  void fix_length_and_dec();
};


unknown's avatar
unknown committed
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363
class Item_func_mod :public Item_num_op
{
public:
  Item_func_mod(Item *a,Item *b) :Item_num_op(a,b) {}
  double val();
  longlong val_int();
  const char *func_name() const { return "%"; }
  void fix_length_and_dec();
};


class Item_func_neg :public Item_num_func
{
public:
  Item_func_neg(Item *a) :Item_num_func(a) {}
  double val();
  longlong val_int();
  const char *func_name() const { return "-"; }
  void fix_length_and_dec();
};


class Item_func_abs :public Item_num_func
{
public:
  Item_func_abs(Item *a) :Item_num_func(a) {}
  const char *func_name() const { return "abs"; }
  double val();
  longlong val_int();
  enum Item_result result_type () const
  { return args[0]->result_type() == INT_RESULT ? INT_RESULT : REAL_RESULT; }
  void fix_length_and_dec();
};

// A class to handle logaritmic and trigometric functions

class Item_dec_func :public Item_real_func
{
 public:
  Item_dec_func(Item *a) :Item_real_func(a) {}
  Item_dec_func(Item *a,Item *b) :Item_real_func(a,b) {}
  void fix_length_and_dec()
  {
    decimals=6; max_length=float_length(decimals);
    maybe_null=1;
  }
  inline double fix_result(double value)
  {
#ifndef HAVE_FINITE
    return value;
#else
    if (finite(value) && value != POSTFIX_ERROR)
      return value;
    null_value=1;
    return 0.0;
#endif
  }
};

class Item_func_exp :public Item_dec_func
{
public:
  Item_func_exp(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "exp"; }
};

364 365 366 367 368 369 370 371 372 373

class Item_func_ln :public Item_dec_func
{
public:
  Item_func_ln(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "ln"; }
};


unknown's avatar
unknown committed
374 375 376 377
class Item_func_log :public Item_dec_func
{
public:
  Item_func_log(Item *a) :Item_dec_func(a) {}
378
  Item_func_log(Item *a,Item *b) :Item_dec_func(a,b) {}
unknown's avatar
unknown committed
379 380 381 382 383
  double val();
  const char *func_name() const { return "log"; }
};


384 385 386 387 388 389 390 391 392
class Item_func_log2 :public Item_dec_func
{
public:
  Item_func_log2(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "log2"; }
};


unknown's avatar
unknown committed
393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509
class Item_func_log10 :public Item_dec_func
{
public:
  Item_func_log10(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "log10"; }
};


class Item_func_sqrt :public Item_dec_func
{
public:
  Item_func_sqrt(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "sqrt"; }
};


class Item_func_pow :public Item_dec_func
{
public:
  Item_func_pow(Item *a,Item *b) :Item_dec_func(a,b) {}
  double val();
  const char *func_name() const { return "pow"; }
};


class Item_func_acos :public Item_dec_func
{
 public:
  Item_func_acos(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "acos"; }
};

class Item_func_asin :public Item_dec_func
{
 public:
  Item_func_asin(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "asin"; }
};

class Item_func_atan :public Item_dec_func
{
 public:
  Item_func_atan(Item *a) :Item_dec_func(a) {}
  Item_func_atan(Item *a,Item *b) :Item_dec_func(a,b) {}
  double val();
  const char *func_name() const { return "atan"; }
};

class Item_func_cos :public Item_dec_func
{
 public:
  Item_func_cos(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "cos"; }
};

class Item_func_sin :public Item_dec_func
{
 public:
  Item_func_sin(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "sin"; }
};

class Item_func_tan :public Item_dec_func
{
 public:
  Item_func_tan(Item *a) :Item_dec_func(a) {}
  double val();
  const char *func_name() const { return "tan"; }
};

class Item_func_integer :public Item_int_func
{
public:
  inline Item_func_integer(Item *a) :Item_int_func(a) {}
  void fix_length_and_dec();
};


class Item_func_ceiling :public Item_func_integer
{
  Item_func_ceiling();				/* Never called */
public:
  Item_func_ceiling(Item *a) :Item_func_integer(a) {}
  const char *func_name() const { return "ceiling"; }
  longlong val_int();
};

class Item_func_floor :public Item_func_integer
{
public:
  Item_func_floor(Item *a) :Item_func_integer(a) {}
  const char *func_name() const { return "floor"; }
  longlong val_int();
};

/* This handles round and truncate */

class Item_func_round :public Item_real_func
{
  bool truncate;
public:
  Item_func_round(Item *a,Item *b,bool trunc_arg)
    :Item_real_func(a,b),truncate(trunc_arg) {}
  const char *func_name() const { return truncate ? "truncate" : "round"; }
  double val();
  void fix_length_and_dec();
};


class Item_func_rand :public Item_real_func
{
510
  struct rand_struct *rand;
unknown's avatar
unknown committed
511 512 513 514 515 516
public:
  Item_func_rand(Item *a) :Item_real_func(a) {}
  Item_func_rand()	  :Item_real_func()  {}
  double val();
  const char *func_name() const { return "rand"; }
  bool const_item() const { return 0; }
unknown's avatar
unknown committed
517
  void update_used_tables();
518
  void fix_length_and_dec();
unknown's avatar
unknown committed
519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550
};


class Item_func_sign :public Item_int_func
{
public:
  Item_func_sign(Item *a) :Item_int_func(a) {}
  const char *func_name() const { return "sign"; }
  longlong val_int();
};


class Item_func_units :public Item_real_func
{
  char *name;
  double mul,add;
 public:
  Item_func_units(char *name_arg,Item *a,double mul_arg,double add_arg)
    :Item_real_func(a),name(name_arg),mul(mul_arg),add(add_arg) {}
  double val();
  const char *func_name() const { return name; }
  void fix_length_and_dec() { decimals=NOT_FIXED_DEC; max_length=float_length(decimals); }
};


class Item_func_min_max :public Item_func
{
  Item_result cmp_type;
  String tmp_value;
  int cmp_sign;
public:
  Item_func_min_max(List<Item> &list,int cmp_sign_arg) :Item_func(list),
551
    cmp_type(INT_RESULT), cmp_sign(cmp_sign_arg) {}
unknown's avatar
unknown committed
552 553 554 555 556
  double val();
  longlong val_int();
  String *val_str(String *);
  void fix_length_and_dec();
  enum Item_result result_type () const { return cmp_type; }
unknown's avatar
unknown committed
557
  table_map not_null_tables() const { return 0; }
unknown's avatar
unknown committed
558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
};

class Item_func_min :public Item_func_min_max
{
public:
  Item_func_min(List<Item> &list) :Item_func_min_max(list,1) {}
  const char *func_name() const { return "least"; }
};

class Item_func_max :public Item_func_min_max
{
public:
  Item_func_max(List<Item> &list) :Item_func_min_max(list,-1) {}
  const char *func_name() const { return "greatest"; }
};

unknown's avatar
unknown committed
574

unknown's avatar
unknown committed
575 576 577 578 579 580 581 582 583 584
class Item_func_length :public Item_int_func
{
  String value;
public:
  Item_func_length(Item *a) :Item_int_func(a) {}
  longlong val_int();
  const char *func_name() const { return "length"; }
  void fix_length_and_dec() { max_length=10; }
};

unknown's avatar
unknown committed
585 586 587 588
class Item_func_bit_length :public Item_func_length
{
public:
  Item_func_bit_length(Item *a) :Item_func_length(a) {}
589 590
  longlong val_int()
    { DBUG_ASSERT(fixed == 1); return Item_func_length::val_int()*8; }
unknown's avatar
unknown committed
591 592 593
  const char *func_name() const { return "bit_length"; }
};

unknown's avatar
unknown committed
594 595 596 597 598 599 600 601 602 603
class Item_func_char_length :public Item_int_func
{
  String value;
public:
  Item_func_char_length(Item *a) :Item_int_func(a) {}
  longlong val_int();
  const char *func_name() const { return "char_length"; }
  void fix_length_and_dec() { max_length=10; }
};

unknown's avatar
unknown committed
604 605 606 607 608 609 610 611 612
class Item_func_coercibility :public Item_int_func
{
public:
  Item_func_coercibility(Item *a) :Item_int_func(a) {}
  longlong val_int();
  const char *func_name() const { return "coercibility"; }
  void fix_length_and_dec() { max_length=10; }
};

unknown's avatar
unknown committed
613 614 615
class Item_func_locate :public Item_int_func
{
  String value1,value2;
616
  DTCollation cmp_collation;
unknown's avatar
unknown committed
617 618 619 620 621
public:
  Item_func_locate(Item *a,Item *b) :Item_int_func(a,b) {}
  Item_func_locate(Item *a,Item *b,Item *c) :Item_int_func(a,b,c) {}
  const char *func_name() const { return "locate"; }
  longlong val_int();
622
  void fix_length_and_dec();
623
  void print(String *str);
unknown's avatar
unknown committed
624 625 626 627 628 629
};


class Item_func_field :public Item_int_func
{
  String value,tmp;
630 631
  Item_result cmp_type;
  DTCollation cmp_collation;
unknown's avatar
unknown committed
632
public:
633
  Item_func_field(List<Item> &list) :Item_int_func(list) {}
unknown's avatar
unknown committed
634 635
  longlong val_int();
  const char *func_name() const { return "field"; }
636
  void fix_length_and_dec();
unknown's avatar
unknown committed
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663
};


class Item_func_ascii :public Item_int_func
{
  String value;
public:
  Item_func_ascii(Item *a) :Item_int_func(a) {}
  longlong val_int();
  const char *func_name() const { return "ascii"; }
  void fix_length_and_dec() { max_length=3; }
};

class Item_func_ord :public Item_int_func
{
  String value;
public:
  Item_func_ord(Item *a) :Item_int_func(a) {}
  longlong val_int();
  const char *func_name() const { return "ord"; }
};

class Item_func_find_in_set :public Item_int_func
{
  String value,value2;
  uint enum_value;
  ulonglong enum_bit;
664
  DTCollation cmp_collation;
unknown's avatar
unknown committed
665 666 667 668 669 670 671
public:
  Item_func_find_in_set(Item *a,Item *b) :Item_int_func(a,b),enum_value(0) {}
  longlong val_int();
  const char *func_name() const { return "find_in_set"; }
  void fix_length_and_dec();
};

672
/* Base class for all bit functions: '~', '|', '^', '&', '>>', '<<' */
unknown's avatar
unknown committed
673

674
class Item_func_bit: public Item_int_func
unknown's avatar
unknown committed
675 676
{
public:
677 678 679
  Item_func_bit(Item *a, Item *b) :Item_int_func(a, b) {}
  Item_func_bit(Item *a) :Item_int_func(a) {}
  void fix_length_and_dec() { unsigned_flag= 1; }
unknown's avatar
unknown committed
680
  void print(String *str) { print_op(str); }
681 682 683 684 685 686
};

class Item_func_bit_or :public Item_func_bit
{
public:
  Item_func_bit_or(Item *a, Item *b) :Item_func_bit(a, b) {}
unknown's avatar
unknown committed
687 688 689 690
  longlong val_int();
  const char *func_name() const { return "|"; }
};

691
class Item_func_bit_and :public Item_func_bit
unknown's avatar
unknown committed
692 693
{
public:
694
  Item_func_bit_and(Item *a, Item *b) :Item_func_bit(a, b) {}
unknown's avatar
unknown committed
695 696 697 698 699 700 701 702 703 704
  longlong val_int();
  const char *func_name() const { return "&"; }
};

class Item_func_bit_count :public Item_int_func
{
public:
  Item_func_bit_count(Item *a) :Item_int_func(a) {}
  longlong val_int();
  const char *func_name() const { return "bit_count"; }
unknown's avatar
unknown committed
705
  void fix_length_and_dec() { max_length=2; }
unknown's avatar
unknown committed
706 707
};

708
class Item_func_shift_left :public Item_func_bit
unknown's avatar
unknown committed
709 710
{
public:
711
  Item_func_shift_left(Item *a, Item *b) :Item_func_bit(a, b) {}
unknown's avatar
unknown committed
712 713 714 715
  longlong val_int();
  const char *func_name() const { return "<<"; }
};

716
class Item_func_shift_right :public Item_func_bit
unknown's avatar
unknown committed
717 718
{
public:
719
  Item_func_shift_right(Item *a, Item *b) :Item_func_bit(a, b) {}
unknown's avatar
unknown committed
720 721 722 723
  longlong val_int();
  const char *func_name() const { return ">>"; }
};

724
class Item_func_bit_neg :public Item_func_bit
unknown's avatar
unknown committed
725 726
{
public:
727
  Item_func_bit_neg(Item *a) :Item_func_bit(a) {}
unknown's avatar
unknown committed
728 729
  longlong val_int();
  const char *func_name() const { return "~"; }
unknown's avatar
unknown committed
730
  void print(String *str) { Item_func::print(str); }
unknown's avatar
unknown committed
731 732
};

unknown's avatar
unknown committed
733

734
class Item_func_last_insert_id :public Item_int_func
unknown's avatar
unknown committed
735 736
{
public:
737 738
  Item_func_last_insert_id() :Item_int_func() {}
  Item_func_last_insert_id(Item *a) :Item_int_func(a) {}
unknown's avatar
unknown committed
739 740
  longlong val_int();
  const char *func_name() const { return "last_insert_id"; }
741
  void fix_length_and_dec() { if (arg_count) max_length= args[0]->max_length; }
unknown's avatar
unknown committed
742 743 744 745 746 747 748 749 750 751 752
};

class Item_func_benchmark :public Item_int_func
{
  ulong loop_count;
 public:
  Item_func_benchmark(ulong loop_count_arg,Item *expr)
    :Item_int_func(expr), loop_count(loop_count_arg)
  {}
  longlong val_int();
  const char *func_name() const { return "benchmark"; }
unknown's avatar
unknown committed
753
  void fix_length_and_dec() { max_length=1; maybe_null=0; }
754
  void print(String *str);
unknown's avatar
unknown committed
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
};


#ifdef HAVE_DLOPEN

class Item_udf_func :public Item_func
{
 protected:
  udf_handler udf;

public:
  Item_udf_func(udf_func *udf_arg) :Item_func(), udf(udf_arg) {}
  Item_udf_func(udf_func *udf_arg, List<Item> &list)
    :Item_func(list), udf(udf_arg) {}
  const char *func_name() const { return udf.name(); }
unknown's avatar
unknown committed
770
  bool fix_fields(THD *thd, struct st_table_list *tables, Item **ref)
unknown's avatar
unknown committed
771
  {
772
    DBUG_ASSERT(fixed == 0);
unknown's avatar
unknown committed
773 774 775
    bool res= udf.fix_fields(thd, tables, this, arg_count, args);
    used_tables_cache= udf.used_tables_cache;
    const_item_cache= udf.const_item_cache;
776
    fixed= 1;
unknown's avatar
unknown committed
777 778 779
    return res;
  }
  Item_result result_type () const { return udf.result_type(); }
780
  table_map not_null_tables() const { return 0; }
unknown's avatar
unknown committed
781 782 783 784 785 786 787 788 789
};


class Item_func_udf_float :public Item_udf_func
{
 public:
  Item_func_udf_float(udf_func *udf_arg) :Item_udf_func(udf_arg) {}
  Item_func_udf_float(udf_func *udf_arg, List<Item> &list)
    :Item_udf_func(udf_arg,list) {}
790 791
  longlong val_int()
    { DBUG_ASSERT(fixed == 1); return (longlong) Item_func_udf_float::val(); }
unknown's avatar
unknown committed
792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
  double val();
  String *val_str(String *str);
  void fix_length_and_dec() { fix_num_length_and_dec(); }
};


class Item_func_udf_int :public Item_udf_func
{
public:
  Item_func_udf_int(udf_func *udf_arg) :Item_udf_func(udf_arg) {}
  Item_func_udf_int(udf_func *udf_arg, List<Item> &list)
    :Item_udf_func(udf_arg,list) {}
  longlong val_int();
  double val() { return (double) Item_func_udf_int::val_int(); }
  String *val_str(String *str);
  enum Item_result result_type () const { return INT_RESULT; }
  void fix_length_and_dec() { decimals=0; max_length=21; }
};


class Item_func_udf_str :public Item_udf_func
{
public:
  Item_func_udf_str(udf_func *udf_arg) :Item_udf_func(udf_arg) {}
  Item_func_udf_str(udf_func *udf_arg, List<Item> &list)
    :Item_udf_func(udf_arg,list) {}
  String *val_str(String *);
  double val()
  {
821
    int err;
unknown's avatar
unknown committed
822
    String *res;  res=val_str(&str_value);
823
    return res ? my_strntod(res->charset(),(char*) res->ptr(),res->length(),0,&err) : 0.0;
unknown's avatar
unknown committed
824 825 826
  }
  longlong val_int()
  {
827
    int err;
unknown's avatar
unknown committed
828
    String *res;  res=val_str(&str_value);
829
    return res ? my_strntoll(res->charset(),res->ptr(),res->length(),10,(char**) 0,&err) : (longlong) 0;
unknown's avatar
unknown committed
830 831 832 833 834 835 836 837 838 839 840 841
  }
  enum Item_result result_type () const { return STRING_RESULT; }
  void fix_length_and_dec();
};

#else /* Dummy functions to get sql_yacc.cc compiled */

class Item_func_udf_float :public Item_real_func
{
 public:
  Item_func_udf_float(udf_func *udf_arg) :Item_real_func() {}
  Item_func_udf_float(udf_func *udf_arg, List<Item> &list) :Item_real_func(list) {}
842
  double val() { DBUG_ASSERT(fixed == 1); return 0.0; }
unknown's avatar
unknown committed
843 844 845 846 847 848 849 850
};


class Item_func_udf_int :public Item_int_func
{
public:
  Item_func_udf_int(udf_func *udf_arg) :Item_int_func() {}
  Item_func_udf_int(udf_func *udf_arg, List<Item> &list) :Item_int_func(list) {}
851
  longlong val_int() { DBUG_ASSERT(fixed == 1); return 0; }
unknown's avatar
unknown committed
852 853 854 855 856 857 858 859
};


class Item_func_udf_str :public Item_func
{
public:
  Item_func_udf_str(udf_func *udf_arg) :Item_func() {}
  Item_func_udf_str(udf_func *udf_arg, List<Item> &list)  :Item_func(list) {}
860 861 862 863
  String *val_str(String *)
    { DBUG_ASSERT(fixed == 1); null_value=1; return 0; }
  double val() { DBUG_ASSERT(fixed == 1); null_value=1; return 0.0; }
  longlong val_int() { DBUG_ASSERT(fixed == 1); null_value=1; return 0; }
unknown's avatar
unknown committed
864 865 866 867 868 869 870 871 872 873
  enum Item_result result_type () const { return STRING_RESULT; }
  void fix_length_and_dec() { maybe_null=1; max_length=0; }
};

#endif /* HAVE_DLOPEN */

/*
** User level locks
*/

874
class User_level_lock;
unknown's avatar
unknown committed
875
void item_user_lock_init(void);
876
void item_user_lock_release(User_level_lock *ull);
unknown's avatar
unknown committed
877 878 879 880 881 882 883 884 885
void item_user_lock_free(void);

class Item_func_get_lock :public Item_int_func
{
  String value;
 public:
  Item_func_get_lock(Item *a,Item *b) :Item_int_func(a,b) {}
  longlong val_int();
  const char *func_name() const { return "get_lock"; }
unknown's avatar
unknown committed
886
  void fix_length_and_dec() { max_length=1; maybe_null=1;}
unknown's avatar
unknown committed
887 888 889 890 891 892 893 894 895
};

class Item_func_release_lock :public Item_int_func
{
  String value;
 public:
  Item_func_release_lock(Item *a) :Item_int_func(a) {}
  longlong val_int();
  const char *func_name() const { return "release_lock"; }
unknown's avatar
unknown committed
896
  void fix_length_and_dec() { max_length=1; maybe_null=1;}
unknown's avatar
unknown committed
897 898
};

unknown's avatar
unknown committed
899 900 901 902 903 904 905
/* replication functions */

class Item_master_pos_wait :public Item_int_func
{
  String value;
 public:
  Item_master_pos_wait(Item *a,Item *b) :Item_int_func(a,b) {}
906
  Item_master_pos_wait(Item *a,Item *b,Item *c) :Item_int_func(a,b,c) {}
unknown's avatar
unknown committed
907 908
  longlong val_int();
  const char *func_name() const { return "master_pos_wait"; }
909
  void fix_length_and_dec() { max_length=21; maybe_null=1;}
unknown's avatar
unknown committed
910 911
};

unknown's avatar
unknown committed
912 913 914 915 916 917 918 919 920 921

/* Handling of user definiable variables */

class user_var_entry;

class Item_func_set_user_var :public Item_func
{
  enum Item_result cached_result_type;
  LEX_STRING name;
  user_var_entry *entry;
922 923
  char buffer[MAX_FIELD_WIDTH];
  String value;
924 925 926 927 928 929 930 931
  union
  {
    longlong vint;
    double vreal;
    String *vstr;
  } save_result;
  String save_buff;
  
unknown's avatar
unknown committed
932 933

public:
934 935 936
  Item_func_set_user_var(LEX_STRING a,Item *b)
    :Item_func(b), cached_result_type(INT_RESULT), name(a)
  {}
unknown's avatar
unknown committed
937 938 939
  double val();
  longlong val_int();
  String *val_str(String *str);
unknown's avatar
unknown committed
940
  bool update_hash(void *ptr, uint length, enum Item_result type, 
941
  		   CHARSET_INFO *cs, Derivation dv);
942
  bool check();
unknown's avatar
unknown committed
943 944
  bool update();
  enum Item_result result_type () const { return cached_result_type; }
unknown's avatar
unknown committed
945
  bool fix_fields(THD *thd, struct st_table_list *tables, Item **ref);
unknown's avatar
unknown committed
946
  void fix_length_and_dec();
unknown's avatar
unknown committed
947
  void print(String *str);
948
  void print_as_stmt(String *str);
unknown's avatar
unknown committed
949 950 951 952 953 954 955
  const char *func_name() const { return "set_user_var"; }
};


class Item_func_get_user_var :public Item_func
{
  LEX_STRING name;
956
  user_var_entry *var_entry;
unknown's avatar
unknown committed
957 958

public:
959
  Item_func_get_user_var(LEX_STRING a):
960
    Item_func(), name(a) {}
961 962
  enum Functype functype() const { return GUSERVAR_FUNC; }
  LEX_STRING get_name() { return name; }
unknown's avatar
unknown committed
963 964 965 966
  double val();
  longlong val_int();
  String *val_str(String* str);
  void fix_length_and_dec();
unknown's avatar
unknown committed
967
  void print(String *str);
unknown's avatar
unknown committed
968
  enum Item_result result_type() const;
969 970 971 972 973
  /*
    We must always return variables as strings to guard against selects of type
    select @t1:=1,@t1,@t:="hello",@t from foo where (@t1:= t2.b)
  */
  enum_field_types field_type() const  { return MYSQL_TYPE_STRING; }
unknown's avatar
unknown committed
974
  const char *func_name() const { return "get_user_var"; }
975
  bool const_item() const;
976
  table_map used_tables() const
977
  { return const_item() ? 0 : RAND_TABLE_BIT; }
978
  bool eq(const Item *item, bool binary_cmp) const;
979
};
unknown's avatar
unknown committed
980

unknown's avatar
unknown committed
981

unknown's avatar
unknown committed
982 983 984 985 986 987 988 989 990 991
class Item_func_inet_aton : public Item_int_func
{
public:
   Item_func_inet_aton(Item *a) :Item_int_func(a) {}
   longlong val_int();
   const char *func_name() const { return "inet_aton"; }
   void fix_length_and_dec() { decimals = 0; max_length = 21; maybe_null=1;}
};


992
/* for fulltext search */
993
#include <ft_global.h>
unknown's avatar
unknown committed
994 995 996 997

class Item_func_match :public Item_real_func
{
public:
998
  uint key, flags;
unknown's avatar
unknown committed
999
  bool join_key;
1000 1001 1002 1003 1004 1005 1006
  DTCollation cmp_collation;
  FT_INFO *ft_handler;
  TABLE *table;
  Item_func_match *master;   // for master-slave optimization
  Item *concat;              // Item_func_concat_ws
  String value;              // value of concat
  String search_value;       // key_item()'s value converted to cmp_collation
unknown's avatar
unknown committed
1007

unknown's avatar
unknown committed
1008 1009
  Item_func_match(List<Item> &a, uint b): Item_real_func(a), key(0), flags(b),
       join_key(0), ft_handler(0), table(0), master(0), concat(0) { }
unknown's avatar
unknown committed
1010
  void cleanup()
1011
  {
unknown's avatar
unknown committed
1012
    DBUG_ENTER("Item_func_match");
1013
    Item_real_func::cleanup();
1014
    if (!master && ft_handler)
1015
    {
unknown's avatar
unknown committed
1016 1017
      ft_handler->please->close_search(ft_handler);
      ft_handler=0;
unknown's avatar
unknown committed
1018
      if (join_key)
1019
	table->file->ft_handler=0;
unknown's avatar
unknown committed
1020
      table->fulltext_searched=0;
1021
    }
1022
    if (concat)
unknown's avatar
unknown committed
1023
    {
1024
      delete concat;
unknown's avatar
unknown committed
1025 1026
      concat= 0;
    }
unknown's avatar
unknown committed
1027
    DBUG_VOID_RETURN;
1028
  }
unknown's avatar
unknown committed
1029
  enum Functype functype() const { return FT_FUNC; }
1030
  const char *func_name() const { return "match"; }
unknown's avatar
unknown committed
1031
  void update_used_tables() {}
1032
  table_map not_null_tables() const { return 0; }
unknown's avatar
unknown committed
1033
  bool fix_fields(THD *thd, struct st_table_list *tlist, Item **ref);
1034
  bool eq(const Item *, bool binary_cmp) const;
1035
  longlong val_int() { DBUG_ASSERT(fixed == 1); return val()!=0.0; }
1036
  double val();
1037
  void print(String *str);
1038 1039

  bool fix_index();
1040
  void init_search(bool no_order);
1041
};
unknown's avatar
unknown committed
1042

unknown's avatar
unknown committed
1043

1044
class Item_func_bit_xor : public Item_func_bit
unknown's avatar
unknown committed
1045 1046
{
public:
1047
  Item_func_bit_xor(Item *a, Item *b) :Item_func_bit(a, b) {}
unknown's avatar
unknown committed
1048 1049 1050 1051
  longlong val_int();
  const char *func_name() const { return "^"; }
};

1052
class Item_func_is_free_lock :public Item_int_func
unknown's avatar
unknown committed
1053 1054 1055
{
  String value;
public:
1056
  Item_func_is_free_lock(Item *a) :Item_int_func(a) {}
unknown's avatar
unknown committed
1057
  longlong val_int();
1058
  const char *func_name() const { return "is_free_lock"; }
unknown's avatar
unknown committed
1059
  void fix_length_and_dec() { decimals=0; max_length=1; maybe_null=1;}
unknown's avatar
unknown committed
1060 1061
};

unknown's avatar
SCRUM  
unknown committed
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
class Item_func_is_used_lock :public Item_int_func
{
  String value;
public:
  Item_func_is_used_lock(Item *a) :Item_int_func(a) {}
  longlong val_int();
  const char *func_name() const { return "is_used_lock"; }
  void fix_length_and_dec() { decimals=0; max_length=10; maybe_null=1;}
};

unknown's avatar
unknown committed
1072 1073
/* For type casts */

1074
enum Cast_target
unknown's avatar
unknown committed
1075 1076
{
  ITEM_CAST_BINARY, ITEM_CAST_SIGNED_INT, ITEM_CAST_UNSIGNED_INT,
unknown's avatar
unknown committed
1077
  ITEM_CAST_DATE, ITEM_CAST_TIME, ITEM_CAST_DATETIME, ITEM_CAST_CHAR
unknown's avatar
unknown committed
1078
};
1079 1080


1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
class Item_func_row_count :public Item_int_func
{
public:
  Item_func_row_count() :Item_int_func() {}
  longlong val_int();
  const char *func_name() const { return "row_count"; }
  void fix_length_and_dec() { decimals= 0; maybe_null=0; }
};


1091 1092 1093 1094 1095 1096 1097
/*
 *
 * Stored FUNCTIONs
 *
 */

class sp_head;
1098
class sp_name;
1099 1100 1101 1102

class Item_func_sp :public Item_func
{
private:
1103
  sp_name *m_name;
1104
  mutable sp_head *m_sp;
1105 1106 1107 1108 1109

  int execute(Item **itp);

public:

1110
  Item_func_sp(sp_name *name);
1111

1112
  Item_func_sp(sp_name *name, List<Item> &list);
1113 1114 1115 1116

  virtual ~Item_func_sp()
  {}

1117
  const char *func_name() const;
1118

1119 1120
  enum enum_field_types field_type() const;

1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
  Item_result result_type() const;

  longlong val_int()
  {
    return (longlong)Item_func_sp::val();
  }

  double val()
  {
    Item *it;

    if (execute(&it))
1133 1134
    {
      null_value= 1;
1135
      return 0.0;
1136
    }
1137 1138 1139 1140 1141 1142 1143 1144
    return it->val();
  }

  String *val_str(String *str)
  {
    Item *it;

    if (execute(&it))
1145 1146
    {
      null_value= 1;
1147
      return NULL;
1148
    }
1149 1150 1151 1152 1153 1154
    return it->val_str(str);
  }

  void fix_length_and_dec();

};
unknown's avatar
unknown committed
1155 1156


1157 1158 1159 1160 1161 1162 1163 1164
class Item_func_found_rows :public Item_int_func
{
public:
  Item_func_found_rows() :Item_int_func() {}
  longlong val_int();
  const char *func_name() const { return "found_rows"; }
  void fix_length_and_dec() { decimals= 0; maybe_null=0; }
};