item.h 29.2 KB
Newer Older
unknown's avatar
unknown committed
1
/* Copyright (C) 2000-2003
unknown's avatar
unknown committed
2

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

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

unknown's avatar
unknown committed
13 14 15 16 17 18 19 20 21
   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 */


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

22
class Protocol;
unknown's avatar
unknown committed
23
struct st_table_list;
unknown's avatar
unknown committed
24
void item_init(void);			/* Init item functions */
unknown's avatar
unknown committed
25

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

/*
   "Declared Type Collation"
   A combination of collation and its deriviation.
*/

enum Derivation
{
  DERIVATION_COERCIBLE= 3,
  DERIVATION_IMPLICIT= 2,
  DERIVATION_NONE= 1,
  DERIVATION_EXPLICIT= 0
};

class DTCollation {
public:
  CHARSET_INFO     *collation;
  enum Derivation derivation;
  
  DTCollation()
  {
    collation= &my_charset_bin;
    derivation= DERIVATION_NONE;
  }
  DTCollation(CHARSET_INFO *collation_arg, Derivation derivation_arg)
  {
    collation= collation_arg;
    derivation= derivation_arg;
  }
55
  void set(DTCollation &dt)
56
  { 
57 58
    collation= dt.collation;
    derivation= dt.derivation;
59 60 61 62 63 64 65 66 67 68
  }
  void set(CHARSET_INFO *collation_arg, Derivation derivation_arg)
  {
    collation= collation_arg;
    derivation= derivation_arg;
  }
  void set(CHARSET_INFO *collation_arg)
  { collation= collation_arg; }
  void set(Derivation derivation_arg)
  { derivation= derivation_arg; }
69 70 71
  bool aggregate(DTCollation &dt);
  bool set(DTCollation &dt1, DTCollation &dt2)
  { set(dt1); return aggregate(dt2); }
72 73 74 75 76 77 78 79 80 81 82 83 84
  const char *derivation_name() const
  {
    switch(derivation)
    {
      case DERIVATION_COERCIBLE: return "COERCIBLE";
      case DERIVATION_IMPLICIT:  return "IMPLICIT";
      case DERIVATION_EXPLICIT:  return "EXPLICIT";
      case DERIVATION_NONE:      return "NONE";
      default: return "UNKNOWN";
    }
  }
};

unknown's avatar
unknown committed
85 86
typedef bool (Item::*Item_processor)(byte *arg);

unknown's avatar
unknown committed
87
class Item {
unknown's avatar
unknown committed
88
  Item(const Item &);			/* Prevent use of these */
unknown's avatar
unknown committed
89 90
  void operator=(Item &);
public:
unknown's avatar
unknown committed
91
  static void *operator new(size_t size) {return (void*) sql_alloc((uint) size); }
92 93
  static void *operator new(size_t size, MEM_ROOT *mem_root)
  { return (void*) alloc_root(mem_root, (uint) size); }
unknown's avatar
unknown committed
94 95
  static void operator delete(void *ptr,size_t size) {} /*lint -e715 */

96 97
  enum Type {FIELD_ITEM, FUNC_ITEM, SUM_FUNC_ITEM, STRING_ITEM,
	     INT_ITEM, REAL_ITEM, NULL_ITEM, VARBIN_ITEM,
unknown's avatar
SCRUM  
unknown committed
98
	     COPY_STR_ITEM, FIELD_AVG_ITEM, DEFAULT_VALUE_ITEM,
unknown's avatar
unknown committed
99 100
	     PROC_ITEM,COND_ITEM, REF_ITEM, FIELD_STD_ITEM,
	     FIELD_VARIANCE_ITEM, INSERT_VALUE_ITEM,
101
             SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM};
unknown's avatar
SCRUM  
unknown committed
102

unknown's avatar
unknown committed
103
  enum cond_result { COND_UNDEF,COND_OK,COND_TRUE,COND_FALSE };
104
  
unknown's avatar
unknown committed
105 106 107 108 109 110 111
  String str_value;			/* used to store value */
  my_string name;			/* Name from select */
  Item *next;
  uint32 max_length;
  uint8 marker,decimals;
  my_bool maybe_null;			/* If item may be null */
  my_bool null_value;			/* if item is null */
112
  my_bool unsigned_flag;
unknown's avatar
unknown committed
113
  my_bool with_sum_func;
114
  my_bool fixed;                        /* If item fixed with fix_fields */
115
  DTCollation collation;
116 117 118 119 120 121 122 123


  /*
    thd is current_thd value. Like some other Item's fields it
    will be a problem for using one Item in different threads
    (as stored procedures may want to do in the future)
  */
  THD *thd;
124
  
unknown's avatar
unknown committed
125 126
  // alloc & destruct is done as start of select using sql_alloc
  Item();
127 128 129 130
  /*
     Constructor used by Item_field, Item_ref & agregate (sum) functions.
     Used for duplicating lists in processing queries with temporary
     tables
131 132 133
     Also it used for Item_cond_and/Item_cond_or for creating
     top AND/OR ctructure of WHERE clause to protect it of
     optimisation changes in prepared statements
134
  */
135
  Item(THD *c_thd, Item &item);
unknown's avatar
unknown committed
136
  virtual ~Item() { name=0; }		/*lint -e1509 */
unknown's avatar
unknown committed
137
  void set_name(const char *str,uint length, CHARSET_INFO *cs);
unknown's avatar
unknown committed
138
  void init_make_field(Send_field *tmp_field,enum enum_field_types type);
139
  virtual void make_field(Send_field *field);
unknown's avatar
unknown committed
140
  virtual bool fix_fields(THD *, struct st_table_list *, Item **);
unknown's avatar
unknown committed
141
  virtual int save_in_field(Field *field, bool no_conversions);
unknown's avatar
unknown committed
142
  virtual void save_org_in_field(Field *field)
143
  { (void) save_in_field(field, 1); }
unknown's avatar
unknown committed
144
  virtual int save_safe_in_field(Field *field)
145
  { return save_in_field(field, 1); }
146
  virtual bool send(Protocol *protocol, String *str);
147
  virtual bool eq(const Item *, bool binary_cmp) const;
unknown's avatar
unknown committed
148
  virtual Item_result result_type () const { return REAL_RESULT; }
149
  virtual enum_field_types field_type() const;
unknown's avatar
unknown committed
150 151 152 153
  virtual enum Type type() const =0;
  virtual double val()=0;
  virtual longlong val_int()=0;
  virtual String *val_str(String*)=0;
154
  virtual Field *get_tmp_table_field() { return 0; }
155
  virtual Field *tmp_table_field(TABLE *t_arg) { return 0; }
unknown's avatar
unknown committed
156 157 158 159
  virtual const char *full_name() const { return name ? name : "???"; }
  virtual double  val_result() { return val(); }
  virtual longlong val_int_result() { return val_int(); }
  virtual String *str_result(String* tmp) { return val_str(tmp); }
160
  /* bit map of tables used by item */
unknown's avatar
unknown committed
161
  virtual table_map used_tables() const { return (table_map) 0L; }
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177
  /*
    Return table map of tables that can't be NULL tables (tables that are
    used in a context where if they would contain a NULL row generated
    by a LEFT or RIGHT join, the item would not be true).
    This expression is used on WHERE item to determinate if a LEFT JOIN can be
    converted to a normal join.
    Generally this function should return used_tables() if the function
    would return null if any of the arguments are null
    As this is only used in the beginning of optimization, the value don't
    have to be updated in update_used_tables()
  */
  virtual table_map not_null_tables() const { return used_tables(); }
  /*
    Returns true if this is a simple constant item like an integer, not
    a constant expression
  */
unknown's avatar
unknown committed
178 179 180 181 182 183 184 185
  virtual bool basic_const_item() const { return 0; }
  virtual Item *new_item() { return 0; }	/* Only for const items */
  virtual cond_result eq_cmp_result() const { return COND_OK; }
  inline uint float_length(uint decimals_par) const
  { return decimals != NOT_FIXED_DEC ? (DBL_DIG+2+decimals_par) : DBL_DIG+8;}
  virtual bool const_item() const { return used_tables() == 0; }
  virtual void print(String *str_arg) { str_arg->append(full_name()); }
  virtual void update_used_tables() {}
186
  virtual void split_sum_func(Item **ref_pointer_array, List<Item> &fields) {}
unknown's avatar
unknown committed
187 188
  virtual bool get_date(TIME *ltime,bool fuzzydate);
  virtual bool get_time(TIME *ltime);
189 190
  virtual bool get_date_result(TIME *ltime,bool fuzzydate)
  { return get_date(ltime,fuzzydate); }
191
  virtual bool is_null() { return 0; }
192
  virtual void top_level_item() {}
unknown's avatar
unknown committed
193 194 195
  virtual void set_result_field(Field *field) {}
  virtual bool is_result_field() { return 0; }
  virtual void save_in_result_field(bool no_conversions) {}
unknown's avatar
unknown committed
196
  virtual void no_rows_in_result() {}
197
  virtual Item *copy_or_same(THD *thd) { return this; }
198
  virtual Item *copy_andor_structure(THD *thd) { return this; }
unknown's avatar
unknown committed
199
  virtual Item *real_item() { return this; }
200
  virtual Item *get_tmp_table_item(THD *thd) { return copy_or_same(thd); }
unknown's avatar
unknown committed
201

202
  CHARSET_INFO *default_charset() const;
unknown's avatar
unknown committed
203 204 205 206 207 208 209

  virtual bool walk(Item_processor processor, byte *arg)
  {
    return (this->*processor)(arg);
  }

  virtual bool remove_dependence_processor(byte * arg) { return 0; }
210
  
unknown's avatar
unknown committed
211 212 213
  // Row emulation
  virtual uint cols() { return 1; }
  virtual Item* el(uint i) { return this; }
214
  virtual Item** addr(uint i) { return 0; }
unknown's avatar
unknown committed
215
  virtual bool check_cols(uint c);
unknown's avatar
unknown committed
216
  // It is not row => null inside is impossible
217 218 219
  virtual bool null_inside() { return 0; }
  // used in row subselects to get value of elements
  virtual void bring_value() {}
220 221

  Field *tmp_table_field_from_field_type(TABLE *table);
unknown's avatar
unknown committed
222 223 224
};


unknown's avatar
unknown committed
225
class st_select_lex;
unknown's avatar
unknown committed
226 227 228 229 230 231
class Item_ident :public Item
{
public:
  const char *db_name;
  const char *table_name;
  const char *field_name;
unknown's avatar
unknown committed
232
  st_select_lex *depended_from;
unknown's avatar
unknown committed
233 234
  Item_ident(const char *db_name_par,const char *table_name_par,
	     const char *field_name_par)
235
    :db_name(db_name_par), table_name(table_name_par),
unknown's avatar
unknown committed
236
     field_name(field_name_par), depended_from(0)
unknown's avatar
unknown committed
237
    { name = (char*) field_name_par; }
238 239
  // Constructor used by Item_field & Item_ref (see Item comment)
  Item_ident(THD *thd, Item_ident &item);
unknown's avatar
unknown committed
240
  const char *full_name() const;
unknown's avatar
unknown committed
241 242

  bool remove_dependence_processor(byte * arg);
unknown's avatar
unknown committed
243 244
};

unknown's avatar
unknown committed
245

unknown's avatar
unknown committed
246 247 248 249 250 251 252 253 254 255
class Item_field :public Item_ident
{
  void set_field(Field *field);
public:
  Field *field,*result_field;
  // Item_field() {}

  Item_field(const char *db_par,const char *table_name_par,
	     const char *field_name_par)
    :Item_ident(db_par,table_name_par,field_name_par),field(0),result_field(0)
256
  { collation.set(DERIVATION_IMPLICIT); }
257 258
  // Constructor need to process subselect with temporary tables (see Item)
  Item_field(THD *thd, Item_field &item);
unknown's avatar
unknown committed
259 260
  Item_field(Field *field);
  enum Type type() const { return FIELD_ITEM; }
261
  bool eq(const Item *item, bool binary_cmp) const;
unknown's avatar
unknown committed
262 263 264 265 266 267
  double val();
  longlong val_int();
  String *val_str(String*);
  double val_result();
  longlong val_int_result();
  String *str_result(String* tmp);
268
  bool send(Protocol *protocol, String *str_arg);
unknown's avatar
unknown committed
269
  bool fix_fields(THD *, struct st_table_list *, Item **);
270
  void make_field(Send_field *tmp_field);
unknown's avatar
unknown committed
271
  int save_in_field(Field *field,bool no_conversions);
unknown's avatar
unknown committed
272 273 274 275 276 277
  void save_org_in_field(Field *field);
  table_map used_tables() const;
  enum Item_result result_type () const
  {
    return field->result_type();
  }
unknown's avatar
unknown committed
278
  enum_field_types field_type() const
279 280 281
  {
    return field->type();
  }
282
  Field *get_tmp_table_field() { return result_field; }
283
  Field *tmp_table_field(TABLE *t_arg) { return result_field; }
284 285 286
  bool get_date(TIME *ltime,bool fuzzydate);
  bool get_date_result(TIME *ltime,bool fuzzydate);
  bool get_time(TIME *ltime);
unknown's avatar
unknown committed
287
  bool is_null() { return field->is_null(); }
288
  Item *get_tmp_table_item(THD *thd);
unknown's avatar
SCRUM  
unknown committed
289
  friend class Item_default_value;
unknown's avatar
unknown committed
290
  friend class Item_insert_value;
unknown's avatar
unknown committed
291 292 293 294 295 296 297 298
};

class Item_null :public Item
{
public:
  Item_null(char *name_par=0)
    { maybe_null=null_value=TRUE; name= name_par ? name_par : (char*) "NULL";}
  enum Type type() const { return NULL_ITEM; }
299
  bool eq(const Item *item, bool binary_cmp) const;
unknown's avatar
unknown committed
300 301 302
  double val();
  longlong val_int();
  String *val_str(String *str);
unknown's avatar
unknown committed
303
  int save_in_field(Field *field, bool no_conversions);
unknown's avatar
unknown committed
304
  int save_safe_in_field(Field *field);
unknown's avatar
unknown committed
305
  bool send(Protocol *protocol, String *str);
306 307 308 309 310 311 312 313
  enum Item_result result_type () const { return STRING_RESULT; }
  enum_field_types field_type() const   { return MYSQL_TYPE_NULL; }
  bool fix_fields(THD *thd, struct st_table_list *list, Item **item)
  {
    bool res= Item::fix_fields(thd, list, item);
    max_length=0;
    return res;
  }
unknown's avatar
unknown committed
314 315
  bool basic_const_item() const { return 1; }
  Item *new_item() { return new Item_null(name); }
unknown's avatar
unknown committed
316
  bool is_null() { return 1; }
unknown's avatar
unknown committed
317 318
};

unknown's avatar
unknown committed
319 320 321 322 323
class Item_param :public Item
{
public:    
  longlong int_value;
  double   real_value;
324
  TIME     ltime;
unknown's avatar
unknown committed
325 326 327
  enum Item_result item_result_type;
  enum Type item_type;
  enum enum_field_types buffer_type;
328
  bool item_is_time;
329 330
  bool long_data_supplied;
  uint pos_in_query;
unknown's avatar
unknown committed
331

332
  Item_param::Item_param(uint position)
333
  { 
334 335
    name= (char*) "?";
    pos_in_query= position;
unknown's avatar
unknown committed
336
    item_type= STRING_ITEM;
337
    item_result_type = STRING_RESULT;
338
    item_is_time= false;
339
    long_data_supplied= false;
unknown's avatar
unknown committed
340 341 342 343 344
  }
  enum Type type() const { return item_type; }
  double val();
  longlong val_int();
  String *val_str(String*);
unknown's avatar
unknown committed
345
  int  save_in_field(Field *field, bool no_conversions);
unknown's avatar
unknown committed
346 347 348
  void set_null();
  void set_int(longlong i);
  void set_double(double i);
unknown's avatar
unknown committed
349 350 351 352
  void set_value(const char *str, uint length);
  void set_long_str(const char *str, ulong length);
  void set_long_binary(const char *str, ulong length);
  void set_longdata(const char *str, ulong length);
unknown's avatar
unknown committed
353
  void set_long_end();
354 355
  void set_time(TIME *tm, timestamp_type type);
  bool get_time(TIME *tm);
356
  void reset() {}
unknown's avatar
unknown committed
357
  void (*setup_param_func)(Item_param *param, uchar **pos);
unknown's avatar
unknown committed
358
  enum Item_result result_type () const
unknown's avatar
unknown committed
359
  { return item_result_type; }
360
  String *query_val_str(String *str);
361
  enum_field_types field_type() const { return MYSQL_TYPE_STRING; }
362
  Item *new_item() { return new Item_param(pos_in_query); }
unknown's avatar
unknown committed
363
};
unknown's avatar
unknown committed
364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379

class Item_int :public Item
{
public:
  const longlong value;
  Item_int(int32 i,uint length=11) :value((longlong) i)
    { max_length=length;}
#ifdef HAVE_LONG_LONG
  Item_int(longlong i,uint length=21) :value(i)
    { max_length=length;}
#endif
  Item_int(const char *str_arg,longlong i,uint length) :value(i)
    { max_length=length; name=(char*) str_arg;}
  Item_int(const char *str_arg) :
    value(str_arg[0] == '-' ? strtoll(str_arg,(char**) 0,10) :
	  (longlong) strtoull(str_arg,(char**) 0,10))
unknown's avatar
unknown committed
380
    { max_length= (uint) strlen(str_arg); name=(char*) str_arg;}
unknown's avatar
unknown committed
381
  enum Type type() const { return INT_ITEM; }
382 383
  enum Item_result result_type () const { return INT_RESULT; }
  enum_field_types field_type() const { return MYSQL_TYPE_LONGLONG; }
unknown's avatar
unknown committed
384 385 386
  longlong val_int() { return value; }
  double val() { return (double) value; }
  String *val_str(String*);
unknown's avatar
unknown committed
387
  int save_in_field(Field *field, bool no_conversions);
unknown's avatar
unknown committed
388 389 390 391 392 393
  bool basic_const_item() const { return 1; }
  Item *new_item() { return new Item_int(name,value,max_length); }
  void print(String *str);
};


unknown's avatar
unknown committed
394 395 396 397 398
class Item_uint :public Item_int
{
public:
  Item_uint(const char *str_arg, uint length) :
    Item_int(str_arg, (longlong) strtoull(str_arg,(char**) 0,10), length) {}
unknown's avatar
unknown committed
399
  Item_uint(uint32 i) :Item_int((longlong) i, 10) {}
400
  double val() { return ulonglong2double((ulonglong)value); }
unknown's avatar
unknown committed
401 402
  String *val_str(String*);
  Item *new_item() { return new Item_uint(name,max_length); }
403 404 405 406 407 408
  bool fix_fields(THD *thd, struct st_table_list *list, Item **item)
  {
    bool res= Item::fix_fields(thd, list, item);
    unsigned_flag= 1;
    return res;
  }
unknown's avatar
unknown committed
409 410 411 412
  void print(String *str);
};


unknown's avatar
unknown committed
413 414 415 416 417 418 419 420
class Item_real :public Item
{
public:
  const double value;
  // Item_real() :value(0) {}
  Item_real(const char *str_arg,uint length) :value(atof(str_arg))
  {
    name=(char*) str_arg;
unknown's avatar
unknown committed
421
    decimals=(uint8) nr_of_decimals(str_arg);
unknown's avatar
unknown committed
422 423 424 425 426 427
    max_length=length;
  }
  Item_real(const char *str,double val_arg,uint decimal_par,uint length)
    :value(val_arg)
  {
    name=(char*) str;
unknown's avatar
unknown committed
428
    decimals=(uint8) decimal_par;
unknown's avatar
unknown committed
429 430 431
    max_length=length;
  }
  Item_real(double value_par) :value(value_par) {}
unknown's avatar
unknown committed
432
  int save_in_field(Field *field, bool no_conversions);
unknown's avatar
unknown committed
433
  enum Type type() const { return REAL_ITEM; }
434
  enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE; }
unknown's avatar
unknown committed
435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
  double val() { return value; }
  longlong val_int() { return (longlong) (value+(value > 0 ? 0.5 : -0.5));}
  String *val_str(String*);
  bool basic_const_item() const { return 1; }
  Item *new_item() { return new Item_real(name,value,decimals,max_length); }
};


class Item_float :public Item_real
{
public:
  Item_float(const char *str,uint length) :Item_real(str,length)
  {
    decimals=NOT_FIXED_DEC;
    max_length=DBL_DIG+8;
  }
};

class Item_string :public Item
{
public:
unknown's avatar
unknown committed
456
  Item_string(const char *str,uint length,
457
  	      CHARSET_INFO *cs, Derivation dv= DERIVATION_COERCIBLE)
unknown's avatar
unknown committed
458
  {
459
    collation.set(cs, dv);
460
    str_value.set(str,length,cs);
461
    max_length= str_value.numchars()*cs->mbmaxlen;
unknown's avatar
unknown committed
462
    set_name(str, length, cs);
unknown's avatar
unknown committed
463 464
    decimals=NOT_FIXED_DEC;
  }
465
  Item_string(const char *name_par, const char *str, uint length,
466
	      CHARSET_INFO *cs, Derivation dv= DERIVATION_COERCIBLE)
unknown's avatar
unknown committed
467
  {
468
    collation.set(cs, dv);
469
    str_value.set(str,length,cs);
470
    max_length= str_value.numchars()*cs->mbmaxlen;
unknown's avatar
unknown committed
471
    set_name(name_par,0,cs);
unknown's avatar
unknown committed
472 473 474 475
    decimals=NOT_FIXED_DEC;
  }
  ~Item_string() {}
  enum Type type() const { return STRING_ITEM; }
476 477
  double val()
  { 
478
    int err;
479
    return my_strntod(str_value.charset(), (char*) str_value.ptr(),
480
		      str_value.length(), (char**) 0, &err);
481 482 483
  }
  longlong val_int()
  {
484
    int err;
485
    return my_strntoll(str_value.charset(), str_value.ptr(),
486
		       str_value.length(), 10, (char**) 0, &err);
487
  }
unknown's avatar
unknown committed
488
  String *val_str(String*) { return (String*) &str_value; }
unknown's avatar
unknown committed
489
  int save_in_field(Field *field, bool no_conversions);
unknown's avatar
unknown committed
490
  enum Item_result result_type () const { return STRING_RESULT; }
491
  enum_field_types field_type() const { return MYSQL_TYPE_STRING; }
unknown's avatar
unknown committed
492
  bool basic_const_item() const { return 1; }
493
  bool eq(const Item *item, bool binary_cmp) const;
494 495
  Item *new_item() 
  {
unknown's avatar
unknown committed
496
    return new Item_string(name, str_value.ptr(), max_length, &my_charset_bin);
497
  }
unknown's avatar
unknown committed
498
  String *const_string() { return &str_value; }
499
  inline void append(char *str, uint length) { str_value.append(str, length); }
unknown's avatar
unknown committed
500 501 502 503 504 505 506 507
  void print(String *str);
};

/* for show tables */

class Item_datetime :public Item_string
{
public:
unknown's avatar
unknown committed
508 509
  Item_datetime(const char *item_name): Item_string(item_name,"",0,
  						    &my_charset_bin)
unknown's avatar
unknown committed
510
  { max_length=19;}
511
  enum_field_types field_type() const { return MYSQL_TYPE_DATETIME; }
unknown's avatar
unknown committed
512 513 514 515 516
};

class Item_empty_string :public Item_string
{
public:
unknown's avatar
unknown committed
517 518
  Item_empty_string(const char *header,uint length) :Item_string("",0,
  							&my_charset_bin)
unknown's avatar
unknown committed
519 520 521
    { name=(char*) header; max_length=length;}
};

522 523 524 525 526 527 528 529 530 531 532 533 534 535
class Item_return_int :public Item_int
{
  enum_field_types int_field_type;
public:
  Item_return_int(const char *name, uint length,
		  enum_field_types field_type_arg)
    :Item_int(name, 0, length), int_field_type(field_type_arg)
  {
    unsigned_flag=1;
  }
  enum_field_types field_type() const { return int_field_type; }
};


unknown's avatar
unknown committed
536 537 538
class Item_varbinary :public Item
{
public:
539
  Item_varbinary(const char *str,uint str_length);
unknown's avatar
unknown committed
540 541 542 543 544
  ~Item_varbinary() {}
  enum Type type() const { return VARBIN_ITEM; }
  double val() { return (double) Item_varbinary::val_int(); }
  longlong val_int();
  String *val_str(String*) { return &str_value; }
unknown's avatar
unknown committed
545
  int save_in_field(Field *field, bool no_conversions);
546
  enum Item_result result_type () const { return STRING_RESULT; }
547
  enum_field_types field_type() const { return MYSQL_TYPE_STRING; }
unknown's avatar
unknown committed
548 549 550 551 552 553 554 555
};


class Item_result_field :public Item	/* Item with result field */
{
public:
  Field *result_field;				/* Save result here */
  Item_result_field() :result_field(0) {}
556
  // Constructor used for Item_sum/Item_cond_and/or (see Item comment)
557 558 559
  Item_result_field(THD *thd, Item_result_field &item):
    Item(thd, item), result_field(item.result_field)
  {}
unknown's avatar
unknown committed
560
  ~Item_result_field() {}			/* Required with gcc 2.95 */
561
  Field *get_tmp_table_field() { return result_field; }
562
  Field *tmp_table_field(TABLE *t_arg) { return result_field; }
unknown's avatar
unknown committed
563
  table_map used_tables() const { return 1; }
unknown's avatar
unknown committed
564
  virtual void fix_length_and_dec()=0;
unknown's avatar
unknown committed
565 566 567 568 569 570
  void set_result_field(Field *field) { result_field= field; }
  bool is_result_field() { return 1; }
  void save_in_result_field(bool no_conversions)
  {
    save_in_field(result_field, no_conversions);
  }
unknown's avatar
unknown committed
571 572 573 574 575 576
};


class Item_ref :public Item_ident
{
public:
unknown's avatar
unknown committed
577
  Field *result_field;				/* Save result here */
unknown's avatar
unknown committed
578
  Item **ref;
unknown's avatar
unknown committed
579 580
  Item_ref(const char *db_par, const char *table_name_par,
	   const char *field_name_par)
unknown's avatar
unknown committed
581
    :Item_ident(db_par,table_name_par,field_name_par),ref(0) {}
unknown's avatar
unknown committed
582
  Item_ref(Item **item, const char *table_name_par, const char *field_name_par)
unknown's avatar
unknown committed
583
    :Item_ident(NullS,table_name_par,field_name_par),ref(item) {}
584 585 586
  // Constructor need to process subselect with temporary tables (see Item)
  Item_ref(THD *thd, Item_ref &item)
    :Item_ident(thd, item), ref(item.ref) {}
unknown's avatar
unknown committed
587
  enum Type type() const		{ return REF_ITEM; }
588
  bool eq(const Item *item, bool binary_cmp) const
unknown's avatar
unknown committed
589
  { return ref && (*ref)->eq(item, binary_cmp); }
590
  ~Item_ref() { if (ref && (*ref) && (*ref) != this) delete *ref; }
unknown's avatar
unknown committed
591 592 593
  double val()
  {
    double tmp=(*ref)->val_result();
unknown's avatar
unknown committed
594
    null_value=(*ref)->null_value;
unknown's avatar
unknown committed
595 596 597 598 599
    return tmp;
  }
  longlong val_int()
  {
    longlong tmp=(*ref)->val_int_result();
unknown's avatar
unknown committed
600
    null_value=(*ref)->null_value;
unknown's avatar
unknown committed
601 602 603 604 605
    return tmp;
  }
  String *val_str(String* tmp)
  {
    tmp=(*ref)->str_result(tmp);
unknown's avatar
unknown committed
606
    null_value=(*ref)->null_value;
unknown's avatar
unknown committed
607 608
    return tmp;
  }
609 610 611
  bool is_null()
  {
    (void) (*ref)->val_int_result();
unknown's avatar
unknown committed
612
    return (*ref)->null_value;
613
  }
unknown's avatar
unknown committed
614
  bool get_date(TIME *ltime,bool fuzzydate)
615 616
  {
    return (null_value=(*ref)->get_date_result(ltime,fuzzydate));
unknown's avatar
unknown committed
617
  }
618
  bool send(Protocol *prot, String *tmp){ return (*ref)->send(prot, tmp); }
unknown's avatar
unknown committed
619
  void make_field(Send_field *field)	{ (*ref)->make_field(field); }
unknown's avatar
unknown committed
620
  bool fix_fields(THD *, struct st_table_list *, Item **);
unknown's avatar
unknown committed
621
  int save_in_field(Field *field, bool no_conversions)
622
  { return (*ref)->save_in_field(field, no_conversions); }
unknown's avatar
unknown committed
623 624
  void save_org_in_field(Field *field)	{ (*ref)->save_org_in_field(field); }
  enum Item_result result_type () const { return (*ref)->result_type(); }
625
  enum_field_types field_type() const   { return (*ref)->field_type(); }
unknown's avatar
unknown committed
626
  table_map used_tables() const		{ return (*ref)->used_tables(); }
627
  void set_result_field(Field *field)	{ result_field= field; }
unknown's avatar
unknown committed
628 629 630 631 632
  bool is_result_field() { return 1; }
  void save_in_result_field(bool no_conversions)
  {
    (*ref)->save_in_field(result_field, no_conversions);
  }
unknown's avatar
unknown committed
633
  Item *real_item() { return *ref; }
unknown's avatar
unknown committed
634 635
};

636 637 638 639 640 641 642
class Item_in_subselect;
class Item_ref_null_helper: public Item_ref
{
protected:
  Item_in_subselect* owner;
public:
  Item_ref_null_helper(Item_in_subselect* master, Item **item,
unknown's avatar
unknown committed
643
		       const char *table_name_par, const char *field_name_par):
644 645 646 647 648
    Item_ref(item, table_name_par, field_name_par), owner(master) {}
  double val();
  longlong val_int();
  String* val_str(String* s);
  bool get_date(TIME *ltime, bool fuzzydate);
649 650 651 652 653 654 655 656 657
  void print(String *str)
  {
    str->append("ref_null_helper(");
    if (ref && *ref)
      (*ref)->print(str);
    else
      str->append('?');
    str->append(')');
  }
658 659
};

660 661 662 663 664 665 666 667 668 669
class Item_null_helper :public Item_ref_null_helper
{
  Item *store;
public:
  Item_null_helper(Item_in_subselect* master, Item *item,
		   const char *table_name_par, const char *field_name_par)
    :Item_ref_null_helper(master, &store, table_name_par, field_name_par),
     store(item)
    {}
};
unknown's avatar
unknown committed
670

671 672 673 674 675 676 677 678 679 680 681 682
/*
  The following class is used to optimize comparing of date columns
  We need to save the original item, to be able to set the field to the
  original value in 'opt_range'.
*/

class Item_int_with_ref :public Item_int
{
  Item *ref;
public:
  Item_int_with_ref(longlong i, Item *ref_arg) :Item_int(i), ref(ref_arg)
  {}
unknown's avatar
unknown committed
683
  int save_in_field(Field *field, bool no_conversions)
684
  {
685
    return ref->save_in_field(field, no_conversions);
686 687 688 689
  }
};


690
#include "gstream.h"
unknown's avatar
unknown committed
691
#include "spatial.h"
unknown's avatar
unknown committed
692 693
#include "item_sum.h"
#include "item_func.h"
694
#include "item_row.h"
unknown's avatar
unknown committed
695 696
#include "item_cmpfunc.h"
#include "item_strfunc.h"
697
#include "item_geofunc.h"
unknown's avatar
unknown committed
698 699
#include "item_timefunc.h"
#include "item_uniq.h"
700
#include "item_subselect.h"
unknown's avatar
unknown committed
701 702 703

class Item_copy_string :public Item
{
704
  enum enum_field_types cached_field_type;
unknown's avatar
unknown committed
705 706 707 708 709 710 711 712
public:
  Item *item;
  Item_copy_string(Item *i) :item(i)
  {
    null_value=maybe_null=item->maybe_null;
    decimals=item->decimals;
    max_length=item->max_length;
    name=item->name;
713
    cached_field_type= item->field_type();
unknown's avatar
unknown committed
714 715 716 717
  }
  ~Item_copy_string() { delete item; }
  enum Type type() const { return COPY_STR_ITEM; }
  enum Item_result result_type () const { return STRING_RESULT; }
718
  enum_field_types field_type() const { return cached_field_type; }
unknown's avatar
unknown committed
719
  double val()
720
  {
721
    int err;
722 723
    return (null_value ? 0.0 :
	    my_strntod(str_value.charset(), (char*) str_value.ptr(),
724
		       str_value.length(),NULL,&err));
725
  }
unknown's avatar
unknown committed
726
  longlong val_int()
727 728 729 730
  { 
    int err;
    return null_value ? LL(0) : my_strntoll(str_value.charset(),str_value.ptr(),str_value.length(),10, (char**) 0,&err); 
  }
unknown's avatar
unknown committed
731 732 733 734 735
  String *val_str(String*);
  void make_field(Send_field *field) { item->make_field(field); }
  void copy();
  table_map used_tables() const { return (table_map) 1L; }
  bool const_item() const { return 0; }
unknown's avatar
unknown committed
736
  bool is_null() { return null_value; }
unknown's avatar
unknown committed
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
};


class Item_buff :public Sql_alloc
{
public:
  my_bool null_value;
  Item_buff() :null_value(0) {}
  virtual bool cmp(void)=0;
  virtual ~Item_buff(); /*line -e1509 */
};

class Item_str_buff :public Item_buff
{
  Item *item;
  String value,tmp_value;
public:
  Item_str_buff(Item *arg) :item(arg),value(arg->max_length) {}
  bool cmp(void);
  ~Item_str_buff();				// Deallocate String:s
};


class Item_real_buff :public Item_buff
{
  Item *item;
  double value;
public:
  Item_real_buff(Item *item_par) :item(item_par),value(0.0) {}
  bool cmp(void);
};

class Item_int_buff :public Item_buff
{
  Item *item;
  longlong value;
public:
  Item_int_buff(Item *item_par) :item(item_par),value(0) {}
  bool cmp(void);
};


class Item_field_buff :public Item_buff
{
  char *buff;
  Field *field;
  uint length;

public:
  Item_field_buff(Item_field *item)
  {
    field=item->field;
    buff= (char*) sql_calloc(length=field->pack_length());
  }
  bool cmp(void);
};

unknown's avatar
SCRUM  
unknown committed
794 795 796 797
class Item_default_value : public Item_field
{
public:
  Item *arg;
unknown's avatar
SCRUM  
unknown committed
798 799
  Item_default_value() :
    Item_field((const char *)NULL, (const char *)NULL, (const char *)NULL), arg(NULL) {}
unknown's avatar
unknown committed
800
  Item_default_value(Item *a) :
unknown's avatar
SCRUM  
unknown committed
801
    Item_field((const char *)NULL, (const char *)NULL, (const char *)NULL), arg(a) {}
unknown's avatar
SCRUM  
unknown committed
802
  enum Type type() const { return DEFAULT_VALUE_ITEM; }
unknown's avatar
SCRUM  
unknown committed
803 804
  bool eq(const Item *item, bool binary_cmp) const;
  bool fix_fields(THD *, struct st_table_list *, Item **);
unknown's avatar
SCRUM  
unknown committed
805
  void print(String *str);
unknown's avatar
SCRUM  
unknown committed
806 807 808 809 810 811 812 813 814 815
  virtual bool basic_const_item() const { return true; }
  int save_in_field(Field *field, bool no_conversions)
  {
    if (!arg)
    {
      field->set_default();
      return 0;
    }
    return Item_field::save_in_field(field, no_conversions);
  }
unknown's avatar
SCRUM  
unknown committed
816
  table_map used_tables() const { return (table_map)0L; }
unknown's avatar
unknown committed
817 818 819 820 821 822
  
  bool walk(Item_processor processor, byte *args)
  {
    return arg->walk(processor, args) ||
      (this->*processor)(args);
  }
unknown's avatar
unknown committed
823
};
unknown's avatar
unknown committed
824

unknown's avatar
unknown committed
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
class Item_insert_value : public Item_field
{
public:
  Item *arg;
  Item_insert_value(Item *a) :
    Item_field((const char *)NULL, (const char *)NULL, (const char *)NULL), arg(a) {}
  bool eq(const Item *item, bool binary_cmp) const;
  bool fix_fields(THD *, struct st_table_list *, Item **);
  void print(String *str);
  virtual bool basic_const_item() const { return true; }
  int save_in_field(Field *field, bool no_conversions)
  {
    return Item_field::save_in_field(field, no_conversions);
  }
  table_map used_tables() const { return (table_map)0L; }
unknown's avatar
unknown committed
840 841 842 843 844 845

  bool walk(Item_processor processor, byte *args)
  {
    return arg->walk(processor, args) ||
	    (this->*processor)(args);
  }
unknown's avatar
unknown committed
846 847
};

848 849
class Item_cache: public Item
{
850
  table_map used_table_map;
851
public:
852 853 854 855
  Item_cache(): used_table_map(0) {fixed= 1; null_value= 1;}

  void set_used_tables(table_map map) { used_table_map= map; }

unknown's avatar
unknown committed
856 857
  virtual bool allocate(uint i) { return 0; };
  virtual bool setup(Item *) { return 0; };
858 859 860 861 862 863 864
  virtual void store(Item *)= 0;
  void set_len_n_dec(uint32 max_len, uint8 dec)
  {
    max_length= max_len;
    decimals= dec;
  }
  enum Type type() const { return CACHE_ITEM; }
865
  static Item_cache* get_cache(Item_result type);
866
  table_map used_tables() const { return used_table_map; }
867 868 869 870 871 872
};

class Item_cache_int: public Item_cache
{
  longlong value;
public:
873
  Item_cache_int(): Item_cache() {}
874 875 876 877 878
  
  void store(Item *item)
  {
    value= item->val_int_result();
    null_value= item->null_value;
879
    collation.set(item->collation);
880 881 882
  }
  double val() { return (double) value; }
  longlong val_int() { return value; }
883
  String* val_str(String *str) { str->set(value, default_charset()); return str; }
884 885 886 887 888 889 890
  enum Item_result result_type() const { return INT_RESULT; }
};

class Item_cache_real: public Item_cache
{
  double value;
public:
891
  Item_cache_real(): Item_cache() {}
892 893 894 895 896
  
  void store(Item *item)
  {
    value= item->val_result();
    null_value= item->null_value;
897
    collation.set(item->collation);
898 899 900 901 902
  }
  double val() { return value; }
  longlong val_int() { return (longlong) (value+(value > 0 ? 0.5 : -0.5)); }
  String* val_str(String *str)
  {
903
    str->set(value, decimals, default_charset());
904 905 906 907 908 909 910 911
    return str;
  }
  enum Item_result result_type() const { return REAL_RESULT; }
};

class Item_cache_str: public Item_cache
{
  char buffer[80];
912
  String *value, value_buff;
913
public:
914
  Item_cache_str(): Item_cache() { }
915
  
916 917 918
  void store(Item *item);
  double val();
  longlong val_int();
919 920 921 922 923
  String* val_str(String *) { return value; }
  enum Item_result result_type() const { return STRING_RESULT; }
  CHARSET_INFO *charset() const { return value->charset(); };
};

unknown's avatar
unknown committed
924 925 926
class Item_cache_row: public Item_cache
{
  Item_cache  **values;
unknown's avatar
unknown committed
927
  uint item_count;
unknown's avatar
unknown committed
928
public:
929
  Item_cache_row(): Item_cache(), values(0), item_count(2) {}
unknown's avatar
unknown committed
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
  
  /*
    'allocate' used only in row transformer, to preallocate space for row 
    cache.
  */
  bool allocate(uint num);
  /*
    'setup' is needed only by row => it not called by simple row subselect
    (only by IN subselect (in subselect optimizer))
  */
  bool setup(Item *item);
  void store(Item *item);
  void illegal_method_call(const char *);
  void make_field(Send_field *)
  {
    illegal_method_call((const char*)"make_field");
  };
  double val()
  {
    illegal_method_call((const char*)"val");
    return 0;
  };
  longlong val_int()
  {
    illegal_method_call((const char*)"val_int");
    return 0;
  };
  String *val_str(String *)
  {
    illegal_method_call((const char*)"val_str");
    return 0;
  };
  enum Item_result result_type() const { return ROW_RESULT; }
  
unknown's avatar
unknown committed
964
  uint cols() { return item_count; }
unknown's avatar
unknown committed
965 966 967 968 969 970 971
  Item* el(uint i) { return values[i]; }
  Item** addr(uint i) { return (Item **) (values + i); }
  bool check_cols(uint c);
  bool null_inside();
  void bring_value();
};

unknown's avatar
unknown committed
972 973 974 975
extern Item_buff *new_Item_buff(Item *item);
extern Item_result item_cmp_type(Item_result a,Item_result b);
extern Item *resolve_const_item(Item *item,Item *cmp_item);
extern bool field_is_equal_to_item(Field *field,Item *item);