sql_lex.cc 35.4 KB
Newer Older
unknown's avatar
unknown committed
1
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
unknown's avatar
unknown committed
2

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

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

unknown's avatar
unknown committed
13 14 15 16 17 18 19 20 21 22 23
   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 */


/* A lexical scanner on a temporary buffer with a yacc interface */

#include "mysql_priv.h"
#include "item_create.h"
#include <m_ctype.h>
#include <hash.h>
unknown's avatar
unknown committed
24
#include <assert.h>
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 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78

LEX_STRING tmp_table_alias= {(char*) "tmp-table",8};

/* Macros to look like lex */

#define yyGet()		*(lex->ptr++)
#define yyGetLast()	lex->ptr[-1]
#define yyPeek()	lex->ptr[0]
#define yyPeek2()	lex->ptr[1]
#define yyUnget()	lex->ptr--
#define yySkip()	lex->ptr++
#define yyLength()	((uint) (lex->ptr - lex->tok_start)-1)

#if MYSQL_VERSION_ID < 32300
#define FLOAT_NUM	REAL_NUM
#endif

pthread_key(LEX*,THR_LEX);

#define TOCK_NAME_LENGTH 24

/*
  The following is based on the latin1 character set, and is only
  used when comparing keywords
*/

uchar to_upper_lex[] = {
    0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
   16, 17, 18, 19, 20, 21, 22, 23, 24, 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, 55, 56, 57, 58, 59, 60, 61, 62, 63,
   64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
   80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
   96, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
   80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90,123,124,125,126,127,
  128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
  144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
  160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
  176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
  192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
  208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
  192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
  208,209,210,211,212,213,214,247,216,217,218,219,220,221,222,255
};

inline int lex_casecmp(const char *s, const char *t, uint len)
{
  while (len-- != 0 &&
	 to_upper_lex[(uchar) *s++] == to_upper_lex[(uchar) *t++]) ;
  return (int) len+1;
}

#include "lex_hash.h"

unknown's avatar
unknown committed
79
static uchar state_map[256], ident_map[256];
unknown's avatar
unknown committed
80 81 82 83 84 85 86 87 88 89 90 91 92


void lex_init(void)
{
  uint i;
  DBUG_ENTER("lex_init");
  for (i=0 ; i < array_elements(symbols) ; i++)
    symbols[i].length=(uchar) strlen(symbols[i].name);
  for (i=0 ; i < array_elements(sql_functions) ; i++)
    sql_functions[i].length=(uchar) strlen(sql_functions[i].name);

  VOID(pthread_key_create(&THR_LEX,NULL));

93
  /* Fill state_map with states to get a faster parser */
unknown's avatar
unknown committed
94
  for (i=0; i < sizeof(state_map) ; i++)
unknown's avatar
unknown committed
95
  {
96
    if (my_isalpha(system_charset_info,i))
97
      state_map[i]=(uchar) STATE_IDENT;
98
    else if (my_isdigit(system_charset_info,i))
99
      state_map[i]=(uchar) STATE_NUMBER_IDENT;
unknown's avatar
unknown committed
100
#if defined(USE_MB) && defined(USE_MB_IDENT)
101
    else if (use_mb(system_charset_info) && my_ismbhead(system_charset_info, i))
102
      state_map[i]=(uchar) STATE_IDENT;
unknown's avatar
unknown committed
103
#endif
104
    else if (!my_isgraph(system_charset_info,i))
105
      state_map[i]=(uchar) STATE_SKIP;      
unknown's avatar
unknown committed
106
    else
107
      state_map[i]=(uchar) STATE_CHAR;
unknown's avatar
unknown committed
108
  }
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124
  state_map[(uchar)'_']=state_map[(uchar)'$']=(uchar) STATE_IDENT;
  state_map[(uchar)'\'']=state_map[(uchar)'"']=(uchar) STATE_STRING;
  state_map[(uchar)'-']=state_map[(uchar)'+']=(uchar) STATE_SIGNED_NUMBER;
  state_map[(uchar)'.']=(uchar) STATE_REAL_OR_POINT;
  state_map[(uchar)'>']=state_map[(uchar)'=']=state_map[(uchar)'!']= (uchar) STATE_CMP_OP;
  state_map[(uchar)'<']= (uchar) STATE_LONG_CMP_OP;
  state_map[(uchar)'&']=state_map[(uchar)'|']=(uchar) STATE_BOOL;
  state_map[(uchar)'#']=(uchar) STATE_COMMENT;
  state_map[(uchar)';']=(uchar) STATE_COLON;
  state_map[(uchar)':']=(uchar) STATE_SET_VAR;
  state_map[0]=(uchar) STATE_EOL;
  state_map[(uchar)'\\']= (uchar) STATE_ESCAPE;
  state_map[(uchar)'/']= (uchar) STATE_LONG_COMMENT;
  state_map[(uchar)'*']= (uchar) STATE_END_LONG_COMMENT;
  state_map[(uchar)'@']= (uchar) STATE_USER_END;
  state_map[(uchar) '`']= (uchar) STATE_USER_VARIABLE_DELIMITER;
125
  if (opt_sql_mode & MODE_ANSI_QUOTES)
unknown's avatar
unknown committed
126
  {
127
    state_map[(uchar) '"'] = STATE_USER_VARIABLE_DELIMITER;
unknown's avatar
unknown committed
128
  }
unknown's avatar
unknown committed
129 130 131 132 133 134 135 136 137 138 139 140 141 142

  /*
    Create a second map to make it faster to find identifiers
  */
  for (i=0; i < sizeof(ident_map) ; i++)
  {
    ident_map[i]= (uchar) (state_map[i] == STATE_IDENT ||
			   state_map[i] == STATE_NUMBER_IDENT);
  }

  /* Special handling of hex and binary strings */
  state_map[(uchar)'x']= state_map[(uchar)'X']= (uchar) STATE_IDENT_OR_HEX;
  state_map[(uchar)'b']= state_map[(uchar)'b']= (uchar) STATE_IDENT_OR_BIN;

unknown's avatar
unknown committed
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
  DBUG_VOID_RETURN;
}


void lex_free(void)
{					// Call this when daemon ends
  DBUG_ENTER("lex_free");
  DBUG_VOID_RETURN;
}


LEX *lex_start(THD *thd, uchar *buf,uint length)
{
  LEX *lex= &thd->lex;
  lex->next_state=STATE_START;
  lex->end_of_query=(lex->ptr=buf)+length;
  lex->yylineno = 1;
unknown's avatar
unknown committed
160
  lex->select_lex.create_refs=lex->in_comment=0;
unknown's avatar
unknown committed
161
  lex->length=0;
unknown's avatar
unknown committed
162 163
  lex->select_lex.in_sum_expr=0;
  lex->select_lex.expr_list.empty();
unknown's avatar
unknown committed
164
  lex->select_lex.ftfunc_list_alloc.empty();
165
  lex->select_lex.ftfunc_list= &lex->select_lex.ftfunc_list_alloc;
unknown's avatar
unknown committed
166
  lex->current_select= &lex->select_lex;
unknown's avatar
unknown committed
167
  lex->convert_set= (lex->thd= thd)->variables.convert_set;
unknown's avatar
unknown committed
168
  lex->yacc_yyss=lex->yacc_yyvs=0;
169
  lex->ignore_space=test(thd->sql_mode & MODE_IGNORE_SPACE);
170
  lex->slave_thd_opt=0;
171
  lex->sql_command=SQLCOM_END;
172
  lex->safe_to_cache_query= 1;
173
  bzero(&lex->mi,sizeof(lex->mi));
unknown's avatar
unknown committed
174 175 176 177 178
  return lex;
}

void lex_end(LEX *lex)
{
unknown's avatar
unknown committed
179
  lex->select_lex.expr_list.delete_elements();	// If error when parsing sql-varargs
unknown's avatar
unknown committed
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200
  x_free(lex->yacc_yyss);
  x_free(lex->yacc_yyvs);
}


static int find_keyword(LEX *lex, uint len, bool function)
{
  uchar *tok=lex->tok_start;

  SYMBOL *symbol = get_hash_symbol((const char *)tok,len,function);
  if (symbol)
  {
    lex->yylval->symbol.symbol=symbol;
    lex->yylval->symbol.str= (char*) tok;
    lex->yylval->symbol.length=len;
    return symbol->tok;
  }
#ifdef HAVE_DLOPEN
  udf_func *udf;
  if (function && using_udf_functions && (udf=find_udf((char*) tok, len)))
  {
201
    lex->safe_to_cache_query=0;
202
    lex->yylval->udf=udf;
unknown's avatar
unknown committed
203 204 205 206 207 208 209
    switch (udf->returns) {
    case STRING_RESULT:
      return (udf->type == UDFTYPE_FUNCTION) ? UDF_CHAR_FUNC : UDA_CHAR_SUM;
    case REAL_RESULT:
      return (udf->type == UDFTYPE_FUNCTION) ? UDF_FLOAT_FUNC : UDA_FLOAT_SUM;
    case INT_RESULT:
      return (udf->type == UDFTYPE_FUNCTION) ? UDF_INT_FUNC : UDA_INT_SUM;
unknown's avatar
unknown committed
210 211 212 213
    case ROW_RESULT:
      // This case should never be choosen
      DBUG_ASSERT(0);
      return 0;
unknown's avatar
unknown committed
214 215 216 217 218 219 220 221 222
    }
  }
#endif
  return 0;
}


/* make a copy of token before ptr and set yytoklen */

223
LEX_STRING get_token(LEX *lex,uint length)
unknown's avatar
unknown committed
224 225 226 227
{
  LEX_STRING tmp;
  yyUnget();			// ptr points now after last token char
  tmp.length=lex->yytoklen=length;
228
  tmp.str=(char*) lex->thd->strmake((char*) lex->tok_start,tmp.length);
unknown's avatar
unknown committed
229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
  return tmp;
}

/* Return an unescaped text literal without quotes */
/* Fix sometimes to do only one scan of the string */

static char *get_text(LEX *lex)
{
  reg1 uchar c,sep;
  uint found_escape=0;

  sep= yyGetLast();			// String should end with this
  //lex->tok_start=lex->ptr-1;		// Remember '
  while (lex->ptr != lex->end_of_query)
  {
    c = yyGet();
#ifdef USE_MB
    int l;
247 248
    if (use_mb(system_charset_info) &&
        (l = my_ismbchar(system_charset_info,
unknown's avatar
unknown committed
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276
                         (const char *)lex->ptr-1,
                         (const char *)lex->end_of_query))) {
	lex->ptr += l-1;
	continue;
    }
#endif
    if (c == '\\')
    {					// Escaped character
      found_escape=1;
      if (lex->ptr == lex->end_of_query)
	return 0;
      yySkip();
    }
    else if (c == sep)
    {
      if (c == yyGet())			// Check if two separators in a row
      {
	found_escape=1;			// dupplicate. Remember for delete
	continue;
      }
      else
	yyUnget();

      /* Found end. Unescape and return string */
      uchar *str,*end,*start;

      str=lex->tok_start+1;
      end=lex->ptr-1;
277
      if (!(start=(uchar*) lex->thd->alloc((uint) (end-str)+1)))
unknown's avatar
unknown committed
278
	return (char*) "";		// Sql_alloc has set error flag
unknown's avatar
unknown committed
279 280 281 282 283 284 285 286 287 288 289 290 291
      if (!found_escape)
      {
	lex->yytoklen=(uint) (end-str);
	memcpy(start,str,lex->yytoklen);
	start[lex->yytoklen]=0;
      }
      else
      {
	uchar *to;
	for (to=start ; str != end ; str++)
	{
#ifdef USE_MB
	  int l;
292 293
	  if (use_mb(system_charset_info) &&
              (l = my_ismbchar(system_charset_info,
unknown's avatar
unknown committed
294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363
                               (const char *)str, (const char *)end))) {
	      while (l--)
		  *to++ = *str++;
	      str--;
	      continue;
	  }
#endif
	  if (*str == '\\' && str+1 != end)
	  {
	    switch(*++str) {
	    case 'n':
	      *to++='\n';
	      break;
	    case 't':
	      *to++= '\t';
	      break;
	    case 'r':
	      *to++ = '\r';
	      break;
	    case 'b':
	      *to++ = '\b';
	      break;
	    case '0':
	      *to++= 0;			// Ascii null
	      break;
	    case 'Z':			// ^Z must be escaped on Win32
	      *to++='\032';
	      break;
	    case '_':
	    case '%':
	      *to++= '\\';		// remember prefix for wildcard
	      /* Fall through */
	    default:
	      *to++ = *str;
	      break;
	    }
	  }
	  else if (*str == sep)
	    *to++= *str++;		// Two ' or "
	  else
	    *to++ = *str;

	}
	*to=0;
	lex->yytoklen=(uint) (to-start);
      }
      if (lex->convert_set)
	lex->convert_set->convert((char*) start,lex->yytoklen);
      return (char*) start;
    }
  }
  return 0;					// unexpected end of query
}


/*
** Calc type of integer; long integer, longlong integer or real.
** Returns smallest type that match the string.
** When using unsigned long long values the result is converted to a real
** because else they will be unexpected sign changes because all calculation
** is done with longlong or double.
*/

static const char *long_str="2147483647";
static const uint long_len=10;
static const char *signed_long_str="-2147483648";
static const char *longlong_str="9223372036854775807";
static const uint longlong_len=19;
static const char *signed_longlong_str="-9223372036854775808";
static const uint signed_longlong_len=19;
unknown's avatar
unknown committed
364 365
static const char *unsigned_longlong_str="18446744073709551615";
static const uint unsigned_longlong_len=20;
unknown's avatar
unknown committed
366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420

inline static uint int_token(const char *str,uint length)
{
  if (length < long_len)			// quick normal case
    return NUM;
  bool neg=0;

  if (*str == '+')				// Remove sign and pre-zeros
  {
    str++; length--;
  }
  else if (*str == '-')
  {
    str++; length--;
    neg=1;
  }
  while (*str == '0' && length)
  {
    str++; length --;
  }
  if (length < long_len)
    return NUM;

  uint smaller,bigger;
  const char *cmp;
  if (neg)
  {
    if (length == long_len)
    {
      cmp= signed_long_str+1;
      smaller=NUM;				// If <= signed_long_str
      bigger=LONG_NUM;				// If >= signed_long_str
    }
    else if (length < signed_longlong_len)
      return LONG_NUM;
    else if (length > signed_longlong_len)
      return REAL_NUM;
    else
    {
      cmp=signed_longlong_str+1;
      smaller=LONG_NUM;				// If <= signed_longlong_str
      bigger=REAL_NUM;
    }
  }
  else
  {
    if (length == long_len)
    {
      cmp= long_str;
      smaller=NUM;
      bigger=LONG_NUM;
    }
    else if (length < longlong_len)
      return LONG_NUM;
    else if (length > longlong_len)
unknown's avatar
unknown committed
421 422 423 424 425 426 427
    {
      if (length > unsigned_longlong_len)
	return REAL_NUM;
      cmp=unsigned_longlong_str;
      smaller=ULONGLONG_NUM;
      bigger=REAL_NUM;
    }
unknown's avatar
unknown committed
428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444
    else
    {
      cmp=longlong_str;
      smaller=LONG_NUM;
      bigger=REAL_NUM;
    }
  }
  while (*cmp && *cmp++ == *str++) ;
  return ((uchar) str[-1] <= (uchar) cmp[-1]) ? smaller : bigger;
}


// yylex remember the following states from the following yylex()
// STATE_EOQ ; found end of query
// STATE_OPERATOR_OR_IDENT ; last state was an ident, text or number
// 			     (which can't be followed by a signed number)

445
int yylex(void *arg, void *yythd)
unknown's avatar
unknown committed
446 447 448 449 450
{
  reg1	uchar c;
  int	tokval;
  uint length;
  enum lex_states state,prev_state;
451
  LEX	*lex= &(((THD *)yythd)->lex);
unknown's avatar
unknown committed
452 453 454 455 456 457 458 459 460
  YYSTYPE *yylval=(YYSTYPE*) arg;

  lex->yylval=yylval;			// The global state
  lex->tok_start=lex->tok_end=lex->ptr;
  prev_state=state=lex->next_state;
  lex->next_state=STATE_OPERATOR_OR_IDENT;
  LINT_INIT(c);
  for (;;)
  {
461
    switch (state) {
unknown's avatar
unknown committed
462 463
    case STATE_OPERATOR_OR_IDENT:	// Next is operator or keyword
    case STATE_START:			// Start of token
464
      // Skip startspace
unknown's avatar
unknown committed
465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481
      for (c=yyGet() ; (state_map[c] == STATE_SKIP) ; c= yyGet())
      {
	if (c == '\n')
	  lex->yylineno++;
      }
      lex->tok_start=lex->ptr-1;	// Start of real token
      state= (enum lex_states) state_map[c];
      break;
    case STATE_ESCAPE:
      if (yyGet() == 'N')
      {					// Allow \N as shortcut for NULL
	yylval->lex_str.str=(char*) "\\N";
	yylval->lex_str.length=2;
	return NULL_SYM;
      }
    case STATE_CHAR:			// Unknown or single char token
    case STATE_SKIP:			// This should not happen
unknown's avatar
unknown committed
482
      yylval->lex_str.str=(char*) (lex->ptr=lex->tok_start);// Set to first chr
unknown's avatar
unknown committed
483 484 485 486 487 488 489 490
      yylval->lex_str.length=1;
      c=yyGet();
      if (c != ')')
	lex->next_state= STATE_START;	// Allow signed numbers
      if (c == ',')
	lex->tok_start=lex->ptr;	// Let tok_start point at next item
      return((int) c);

unknown's avatar
unknown committed
491 492
    case STATE_IDENT_OR_HEX:
      if (yyPeek() == '\'')
493
      {					// Found x'hex-number'
unknown's avatar
unknown committed
494
	state= STATE_HEX_NUMBER;
495 496
	break;
      }
unknown's avatar
unknown committed
497 498 499
      /* Fall through */
    case STATE_IDENT_OR_BIN:		// TODO: Add binary string handling
    case STATE_IDENT:
unknown's avatar
unknown committed
500
#if defined(USE_MB) && defined(USE_MB_IDENT)
501
      if (use_mb(system_charset_info))
unknown's avatar
unknown committed
502
      {
503
        if (my_ismbhead(system_charset_info, yyGetLast()))
unknown's avatar
unknown committed
504
        {
505
          int l = my_ismbchar(system_charset_info,
unknown's avatar
unknown committed
506 507 508 509 510 511 512 513
                              (const char *)lex->ptr-1,
                              (const char *)lex->end_of_query);
          if (l == 0) {
            state = STATE_CHAR;
            continue;
          }
          lex->ptr += l - 1;
        }
unknown's avatar
unknown committed
514
        while (ident_map[c=yyGet()])
unknown's avatar
unknown committed
515
        {
516
          if (my_ismbhead(system_charset_info, c))
unknown's avatar
unknown committed
517 518
          {
            int l;
519
            if ((l = my_ismbchar(system_charset_info,
unknown's avatar
unknown committed
520 521 522 523 524 525 526 527 528
                              (const char *)lex->ptr-1,
                              (const char *)lex->end_of_query)) == 0)
              break;
            lex->ptr += l-1;
          }
        }
      }
      else
#endif
unknown's avatar
unknown committed
529
        while (ident_map[c=yyGet()]) ;
unknown's avatar
unknown committed
530 531 532
      length= (uint) (lex->ptr - lex->tok_start)-1;
      if (lex->ignore_space)
      {
533
	for (; state_map[c] == STATE_SKIP ; c= yyGet());
unknown's avatar
unknown committed
534
      }
unknown's avatar
unknown committed
535
      if (c == '.' && ident_map[yyPeek()])
unknown's avatar
unknown committed
536 537 538 539 540 541 542 543 544 545 546 547
	lex->next_state=STATE_IDENT_SEP;
      else
      {					// '(' must follow directly if function
	yyUnget();
	if ((tokval = find_keyword(lex,length,c == '(')))
	{
	  lex->next_state= STATE_START;	// Allow signed numbers
	  return(tokval);		// Was keyword
	}
	yySkip();			// next state does a unget
      }
      yylval->lex_str=get_token(lex,length);
548
      if (lex->convert_set)
unknown's avatar
unknown committed
549
	lex->convert_set->convert((char*) yylval->lex_str.str,lex->yytoklen);
550 551 552 553 554 555 556 557 558 559 560 561 562

      /* 
         Note: "SELECT _bla AS 'alias'"
         _bla should be considered as a IDENT if charset haven't been found.
         So we don't use MYF(MY_WME) with get_charset_by_name to avoid 
         producing an error.
      */

      if ((yylval->lex_str.str[0]=='_') && 
          (lex->charset=get_charset_by_name(yylval->lex_str.str+1,MYF(0))))
        return(UNDERSCORE_CHARSET);
      else
        return(IDENT);
unknown's avatar
unknown committed
563 564 565 566 567 568 569 570

    case STATE_IDENT_SEP:		// Found ident and now '.'
      lex->next_state=STATE_IDENT_START;// Next is an ident (not a keyword)
      yylval->lex_str.str=(char*) lex->ptr;
      yylval->lex_str.length=1;
      c=yyGet();			// should be '.'
      return((int) c);

571
    case STATE_NUMBER_IDENT:		// number or ident which num-start
572
      while (my_isdigit(system_charset_info,(c = yyGet()))) ;
unknown's avatar
unknown committed
573
      if (!ident_map[c])
unknown's avatar
unknown committed
574 575 576 577 578 579
      {					// Can't be identifier
	state=STATE_INT_OR_REAL;
	break;
      }
      if (c == 'e' || c == 'E')
      {
unknown's avatar
unknown committed
580
	// The following test is written this way to allow numbers of type 1e1
581 582
	if (my_isdigit(system_charset_info,yyPeek()) || 
            (c=(yyGet())) == '+' || c == '-')
unknown's avatar
unknown committed
583
	{				// Allow 1E+10
584
	  if (my_isdigit(system_charset_info,yyPeek()))	// Number must have digit after sign
unknown's avatar
unknown committed
585 586
	  {
	    yySkip();
587
	    while (my_isdigit(system_charset_info,yyGet())) ;
unknown's avatar
unknown committed
588 589 590 591 592 593 594 595 596
	    yylval->lex_str=get_token(lex,yyLength());
	    return(FLOAT_NUM);
	  }
	}
	yyUnget(); /* purecov: inspected */
      }
      else if (c == 'x' && (lex->ptr - lex->tok_start) == 2 &&
	  lex->tok_start[0] == '0' )
      {						// Varbinary
597
	while (my_isxdigit(system_charset_info,(c = yyGet()))) ;
unknown's avatar
unknown committed
598
	if ((lex->ptr - lex->tok_start) >= 4 && !ident_map[c])
unknown's avatar
unknown committed
599 600
	{
	  yylval->lex_str=get_token(lex,yyLength());
601
	  yylval->lex_str.str+=2;		// Skip 0x
unknown's avatar
unknown committed
602 603 604 605 606 607 608 609 610
	  yylval->lex_str.length-=2;
	  lex->yytoklen-=2;
	  return (HEX_NUM);
	}
	yyUnget();
      }
      // fall through
    case STATE_IDENT_START:		// Incomplete ident
#if defined(USE_MB) && defined(USE_MB_IDENT)
611
      if (use_mb(system_charset_info))
unknown's avatar
unknown committed
612
      {
613
        if (my_ismbhead(system_charset_info, yyGetLast()))
unknown's avatar
unknown committed
614
        {
615
          int l = my_ismbchar(system_charset_info,
unknown's avatar
unknown committed
616 617 618 619 620 621 622 623 624
                              (const char *)lex->ptr-1,
                              (const char *)lex->end_of_query);
          if (l == 0)
          {
            state = STATE_CHAR;
            continue;
          }
          lex->ptr += l - 1;
        }
unknown's avatar
unknown committed
625
        while (ident_map[c=yyGet()])
unknown's avatar
unknown committed
626
        {
627
          if (my_ismbhead(system_charset_info, c))
unknown's avatar
unknown committed
628 629
          {
            int l;
630
            if ((l = my_ismbchar(system_charset_info,
unknown's avatar
unknown committed
631 632 633 634 635 636 637 638 639
                                 (const char *)lex->ptr-1,
                                 (const char *)lex->end_of_query)) == 0)
              break;
            lex->ptr += l-1;
          }
        }
      }
      else
#endif
unknown's avatar
unknown committed
640
        while (ident_map[c = yyGet()]) ;
unknown's avatar
unknown committed
641

unknown's avatar
unknown committed
642
      if (c == '.' && ident_map[yyPeek()])
unknown's avatar
unknown committed
643 644 645 646 647
	lex->next_state=STATE_IDENT_SEP;// Next is '.'
      // fall through

    case STATE_FOUND_IDENT:		// Complete ident
      yylval->lex_str=get_token(lex,yyLength());
648 649
      if (lex->convert_set)
        lex->convert_set->convert((char*) yylval->lex_str.str,lex->yytoklen);
unknown's avatar
unknown committed
650 651 652
      return(IDENT);

    case STATE_USER_VARIABLE_DELIMITER:
unknown's avatar
unknown committed
653
      lex->tok_start=lex->ptr;			// Skip first `
unknown's avatar
unknown committed
654
#ifdef USE_MB
655
      if (use_mb(system_charset_info))
unknown's avatar
unknown committed
656 657 658 659
      {
	while ((c=yyGet()) && state_map[c] != STATE_USER_VARIABLE_DELIMITER &&
	       c != (uchar) NAMES_SEP_CHAR)
	{
660
          if (my_ismbhead(system_charset_info, c))
unknown's avatar
unknown committed
661 662
          {
            int l;
663
            if ((l = my_ismbchar(system_charset_info,
unknown's avatar
unknown committed
664 665 666 667 668 669 670 671 672 673 674 675 676
                                 (const char *)lex->ptr-1,
                                 (const char *)lex->end_of_query)) == 0)
              break;
            lex->ptr += l-1;
          }
        }
      }
      else
#endif
      {
	while ((c=yyGet()) && state_map[c] != STATE_USER_VARIABLE_DELIMITER &&
	       c != (uchar) NAMES_SEP_CHAR) ;
      }
unknown's avatar
unknown committed
677
      yylval->lex_str=get_token(lex,yyLength());
678 679
      if (lex->convert_set)
        lex->convert_set->convert((char*) yylval->lex_str.str,lex->yytoklen);
unknown's avatar
unknown committed
680
      if (state_map[c] == STATE_USER_VARIABLE_DELIMITER)
681
	yySkip();			// Skip end `
unknown's avatar
unknown committed
682 683 684 685 686
      return(IDENT);

    case STATE_SIGNED_NUMBER:		// Incomplete signed number
      if (prev_state == STATE_OPERATOR_OR_IDENT)
      {
687
	if (c == '-' && yyPeek() == '-' &&
688 689
	    (my_isspace(system_charset_info,yyPeek2()) || 
             my_iscntrl(system_charset_info,yyPeek2())))
unknown's avatar
unknown committed
690 691 692 693 694
	  state=STATE_COMMENT;
	else
	  state= STATE_CHAR;		// Must be operator
	break;
      }
695
      if (!my_isdigit(system_charset_info,c=yyGet()) || yyPeek() == 'x')
unknown's avatar
unknown committed
696 697 698
      {
	if (c != '.')
	{
699
	  if (c == '-' && my_isspace(system_charset_info,yyPeek()))
unknown's avatar
unknown committed
700 701 702 703 704 705 706
	    state=STATE_COMMENT;
	  else
	    state = STATE_CHAR;		// Return sign as single char
	  break;
	}
	yyUnget();			// Fix for next loop
      }
707
      while (my_isdigit(system_charset_info,c=yyGet())) ;	// Incomplete real or int number
unknown's avatar
unknown committed
708
      if ((c == 'e' || c == 'E') &&
709
	  (yyPeek() == '+' || yyPeek() == '-' || my_isdigit(system_charset_info,yyPeek())))
unknown's avatar
unknown committed
710 711 712 713 714 715 716 717 718 719 720 721 722
      {					// Real number
	yyUnget();
	c= '.';				// Fool next test
      }
      // fall through
    case STATE_INT_OR_REAL:		// Compleat int or incompleat real
      if (c != '.')
      {					// Found complete integer number.
	yylval->lex_str=get_token(lex,yyLength());
	return int_token(yylval->lex_str.str,yylval->lex_str.length);
      }
      // fall through
    case STATE_REAL:			// Incomplete real number
723
      while (my_isdigit(system_charset_info,c = yyGet())) ;
unknown's avatar
unknown committed
724 725 726 727

      if (c == 'e' || c == 'E')
      {
	c = yyGet();
unknown's avatar
unknown committed
728
	if (c == '-' || c == '+')
729
	  c = yyGet();			// Skip sign
730
	if (!my_isdigit(system_charset_info,c))
unknown's avatar
unknown committed
731 732 733 734
	{				// No digit after sign
	  state= STATE_CHAR;
	  break;
	}
735
	while (my_isdigit(system_charset_info,yyGet())) ;
unknown's avatar
unknown committed
736 737 738 739 740 741
	yylval->lex_str=get_token(lex,yyLength());
	return(FLOAT_NUM);
      }
      yylval->lex_str=get_token(lex,yyLength());
      return(REAL_NUM);

742 743
    case STATE_HEX_NUMBER:		// Found x'hexstring'
      yyGet();				// Skip '
744
      while (my_isxdigit(system_charset_info,(c = yyGet()))) ;
745 746 747 748 749 750 751 752 753 754 755 756
      length=(lex->ptr - lex->tok_start);	// Length of hexnum+3
      if (!(length & 1) || c != '\'')
      {
	return(ABORT_SYM);		// Illegal hex constant
      }
      yyGet();				// get_token makes an unget
      yylval->lex_str=get_token(lex,length);
      yylval->lex_str.str+=2;		// Skip x'
      yylval->lex_str.length-=3;	// Don't count x' and last '
      lex->yytoklen-=3;
      return (HEX_NUM);

unknown's avatar
unknown committed
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
    case STATE_CMP_OP:			// Incomplete comparison operator
      if (state_map[yyPeek()] == STATE_CMP_OP ||
	  state_map[yyPeek()] == STATE_LONG_CMP_OP)
	yySkip();
      if ((tokval = find_keyword(lex,(uint) (lex->ptr - lex->tok_start),0)))
      {
	lex->next_state= STATE_START;	// Allow signed numbers
	return(tokval);
      }
      state = STATE_CHAR;		// Something fishy found
      break;

    case STATE_LONG_CMP_OP:		// Incomplete comparison operator
      if (state_map[yyPeek()] == STATE_CMP_OP ||
	  state_map[yyPeek()] == STATE_LONG_CMP_OP)
      {
	yySkip();
	if (state_map[yyPeek()] == STATE_CMP_OP)
	  yySkip();
      }
      if ((tokval = find_keyword(lex,(uint) (lex->ptr - lex->tok_start),0)))
      {
	lex->next_state= STATE_START;	// Found long op
	return(tokval);
      }
      state = STATE_CHAR;		// Something fishy found
      break;

    case STATE_BOOL:
      if (c != yyPeek())
      {
	state=STATE_CHAR;
	break;
      }
      yySkip();
      tokval = find_keyword(lex,2,0);	// Is a bool operator
      lex->next_state= STATE_START;	// Allow signed numbers
      return(tokval);

    case STATE_STRING:			// Incomplete text string
      if (!(yylval->lex_str.str = get_text(lex)))
      {
	state= STATE_CHAR;		// Read char by char
	break;
      }
      yylval->lex_str.length=lex->yytoklen;
      return(TEXT_STRING);

    case STATE_COMMENT:			//  Comment
unknown's avatar
unknown committed
806
      lex->select_lex.options|= OPTION_FOUND_COMMENT;
unknown's avatar
unknown committed
807 808 809 810 811 812 813 814 815 816 817
      while ((c = yyGet()) != '\n' && c) ;
      yyUnget();			// Safety against eof
      state = STATE_START;		// Try again
      break;
    case STATE_LONG_COMMENT:		/* Long C comment? */
      if (yyPeek() != '*')
      {
	state=STATE_CHAR;		// Probable division
	break;
      }
      yySkip();				// Skip '*'
unknown's avatar
unknown committed
818
      lex->select_lex.options|= OPTION_FOUND_COMMENT;
unknown's avatar
unknown committed
819 820 821 822 823
      if (yyPeek() == '!')		// MySQL command in comment
      {
	ulong version=MYSQL_VERSION_ID;
	yySkip();
	state=STATE_START;
824
	if (my_isdigit(system_charset_info,yyPeek()))
unknown's avatar
unknown committed
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
	{				// Version number
	  version=strtol((char*) lex->ptr,(char**) &lex->ptr,10);
	}
	if (version <= MYSQL_VERSION_ID)
	{
	  lex->in_comment=1;
	  break;
	}
      }
      while (lex->ptr != lex->end_of_query &&
	     ((c=yyGet()) != '*' || yyPeek() != '/'))
      {
	if (c == '\n')
	  lex->yylineno++;
      }
      if (lex->ptr != lex->end_of_query)
	yySkip();			// remove last '/'
      state = STATE_START;		// Try again
      break;
    case STATE_END_LONG_COMMENT:
      if (lex->in_comment && yyPeek() == '/')
      {
	yySkip();
	lex->in_comment=0;
	state=STATE_START;
      }
      else
	state=STATE_CHAR;		// Return '*'
      break;
    case STATE_SET_VAR:			// Check if ':='
      if (yyPeek() != '=')
      {
	state=STATE_CHAR;		// Return ':'
	break;
      }
      yySkip();
      return (SET_VAR);
    case STATE_COLON:			// optional line terminator
      if (yyPeek())
      {
	state=STATE_CHAR;		// Return ';'
	break;
      }
      /* fall true */
    case STATE_EOL:
      lex->next_state=STATE_END;	// Mark for next loop
      return(END_OF_INPUT);
    case STATE_END:
      lex->next_state=STATE_END;
      return(0);			// We found end of input last time
875 876
      
      /* Actually real shouldn't start with . but allow them anyhow */
unknown's avatar
unknown committed
877
    case STATE_REAL_OR_POINT:
878
      if (my_isdigit(system_charset_info,yyPeek()))
unknown's avatar
unknown committed
879 880 881 882 883 884 885 886
	state = STATE_REAL;		// Real
      else
      {
	state = STATE_CHAR;		// return '.'
	lex->next_state=STATE_IDENT_START;// Next is an ident (not a keyword)
      }
      break;
    case STATE_USER_END:		// end '@' of user@hostname
unknown's avatar
unknown committed
887
      switch (state_map[yyPeek()]) {
unknown's avatar
unknown committed
888 889 890 891
      case STATE_STRING:
      case STATE_USER_VARIABLE_DELIMITER:
	break;
      case STATE_USER_END:
unknown's avatar
unknown committed
892
	lex->next_state=STATE_SYSTEM_VAR;
unknown's avatar
unknown committed
893 894 895 896 897
	break;
      default:
	lex->next_state=STATE_HOSTNAME;
	break;
      }
unknown's avatar
unknown committed
898 899 900 901 902
      yylval->lex_str.str=(char*) lex->ptr;
      yylval->lex_str.length=1;
      return((int) '@');
    case STATE_HOSTNAME:		// end '@' of user@hostname
      for (c=yyGet() ;
903 904
	   my_isalnum(system_charset_info,c) || c == '.' || c == '_' ||
	     c == '$';
unknown's avatar
unknown committed
905 906 907
	   c= yyGet()) ;
      yylval->lex_str=get_token(lex,yyLength());
      return(LEX_HOSTNAME);
unknown's avatar
unknown committed
908 909 910 911 912 913 914 915 916 917 918 919 920
    case STATE_SYSTEM_VAR:
      yylval->lex_str.str=(char*) lex->ptr;
      yylval->lex_str.length=1;
      lex->next_state=STATE_IDENT_OR_KEYWORD;
      yySkip();					// Skip '@'
      return((int) '@');
    case STATE_IDENT_OR_KEYWORD:
      /*
	We come here when we have found two '@' in a row.
	We should now be able to handle:
	[(global | local | session) .]variable_name
      */

unknown's avatar
unknown committed
921
      while (ident_map[c=yyGet()]) ;
unknown's avatar
unknown committed
922 923 924 925 926 927 928 929 930 931 932 933
      if (c == '.')
	lex->next_state=STATE_IDENT_SEP;
      length= (uint) (lex->ptr - lex->tok_start)-1;
      if ((tokval= find_keyword(lex,length,0)))
      {
	yyUnget();				// Put back 'c'
	return(tokval);				// Was keyword
      }
      yylval->lex_str=get_token(lex,length);
      if (lex->convert_set)
	lex->convert_set->convert((char*) yylval->lex_str.str,lex->yytoklen);
      return(IDENT);
unknown's avatar
unknown committed
934 935 936
    }
  }
}
unknown's avatar
unknown committed
937 938 939 940 941 942 943 944 945

/*
  st_select_lex structures initialisations
*/

void st_select_lex_node::init_query()
{
  next= master= slave= link_next= 0;
  prev= link_prev= 0;
unknown's avatar
unknown committed
946
  dependent= 0;
unknown's avatar
unknown committed
947 948 949 950 951 952 953
}

void st_select_lex_node::init_select()
{
  order_list.elements= 0;
  order_list.first= 0;
  order_list.next= (byte**) &order_list.first;
954
  select_limit= HA_POS_ERROR;
955
  offset_limit= 0;
956
  with_sum_func= 0;
unknown's avatar
unknown committed
957
  create_refs= 0;
unknown's avatar
unknown committed
958 959 960 961
}

void st_select_lex_unit::init_query()
{
962
  linkage= GLOBAL_OPTIONS_TYPE;
unknown's avatar
unknown committed
963 964
  st_select_lex_node::init_query();
  global_parameters= this;
965 966
  select_limit_cnt= HA_POS_ERROR;
  offset_limit_cnt= 0;
unknown's avatar
unknown committed
967
  union_option= 0;
unknown's avatar
unknown committed
968
  prepared= optimized= executed= 0;
unknown's avatar
unknown committed
969
  item= 0;
unknown's avatar
unknown committed
970 971 972 973 974 975 976 977 978
}

void st_select_lex::init_query()
{
  st_select_lex_node::init_query();
  table_list.elements= 0;
  table_list.first= 0; 
  table_list.next= (byte**) &table_list.first;
  item_list.empty();
unknown's avatar
unknown committed
979
  join= 0;
980
  olap= UNSPECIFIED_OLAP_TYPE;
981
  having_fix_field= 0;
unknown's avatar
unknown committed
982 983 984 985 986 987 988 989 990 991 992 993 994 995
}

void st_select_lex::init_select()
{
  st_select_lex_node::init_select();
  group_list.elements= 0;
  group_list.first= 0;
  group_list.next= (byte**) &group_list.first;
  options= 0;
  where= having= 0;
  when_list.empty(); 
  expr_list.empty();
  interval_list.empty(); 
  use_index.empty();
unknown's avatar
unknown committed
996 997
  ftfunc_list_alloc.empty();
  ftfunc_list= &ftfunc_list_alloc;
unknown's avatar
unknown committed
998
  linkage= UNSPECIFIED_TYPE;
unknown's avatar
unknown committed
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
}

/*
  st_select_lex structures linking
*/

/* include on level down */
void st_select_lex_node::include_down(st_select_lex_node *upper)
{
  if ((next= upper->slave))
    next->prev= &next;
  prev= &upper->slave;
  upper->slave= this;
  master= upper;
}

/* include neighbour (on same level) */
void st_select_lex_node::include_neighbour(st_select_lex_node *before)
{
  if ((next= before->next))
    next->prev= &next;
  prev= &before->next;
  before->next= this;
  master= before->master;
}

/* including in global SELECT_LEX list */
void st_select_lex_node::include_global(st_select_lex_node **plink)
{
  if ((link_next= *plink))
    link_next->link_prev= &link_next;
  link_prev= plink;
  *plink= this;
}

//excluding from global list (internal function)
void st_select_lex_node::fast_exclude()
{
  if(link_prev)
  {
    if ((*link_prev= link_next))
      link_next->link_prev= link_prev;
    // Remove slave structure
    for (; slave; slave= slave->next)
      slave->fast_exclude();
  }
}

/*
  excluding select_lex structure (except first (first select can't be
  deleted, because it is most upper select))
*/
void st_select_lex_node::exclude()
{
  //exclude from global list
  fast_exclude();
  //exclude from other structures
  if ((*prev= next))
    next->prev= prev;
  /* 
     We do not need following statements, because prev pointer of first 
     list element point to master->slave
     if (master->slave == this)
       master->slave= next;
  */
}
1065

unknown's avatar
unknown committed
1066 1067 1068 1069 1070 1071 1072 1073 1074
void st_select_lex_unit::exclude_level()
{
  SELECT_LEX_UNIT *units= 0, **units_last= &units;
  for(SELECT_LEX *sl= first_select(); sl; sl= sl->next_select())
  {
    if (sl->link_prev && (*sl->link_prev= sl->link_next))
      sl->link_next->link_prev= sl->link_prev;
    SELECT_LEX_UNIT **last= 0;
    for (SELECT_LEX_UNIT *u= sl->first_inner_unit(); u; u= u->next_unit())
unknown's avatar
unknown committed
1075 1076
    {
      u->master= master;
unknown's avatar
unknown committed
1077
      last= (SELECT_LEX_UNIT**)&(u->next);
unknown's avatar
unknown committed
1078
    }
unknown's avatar
unknown committed
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
    if (last)
    {
      (*units_last)= sl->first_inner_unit();
      units_last= last;
    }
  }
  if (units)
  {
    (*prev)= units;
    (*units_last)= (SELECT_LEX_UNIT*)next;
  }
  else
    (*prev)= next;
}

unknown's avatar
unknown committed
1094 1095 1096
st_select_lex* st_select_lex_node::select_lex()
{
  DBUG_ENTER("st_select_lex_node::select_lex (never should be called)");
1097
  DBUG_ASSERT(0);
unknown's avatar
unknown committed
1098 1099 1100
  DBUG_RETURN(0);
}

1101 1102 1103 1104 1105
bool st_select_lex_node::add_item_to_list(Item *item)
{
  return 1;
}

unknown's avatar
unknown committed
1106
bool st_select_lex_node::add_group_to_list(Item *item, bool asc)
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
{
  return 1; 
}

bool st_select_lex_node::add_order_to_list(Item *item, bool asc)
{ 
  return add_to_list(order_list,item,asc);
}

bool st_select_lex_node::add_ftfunc_to_list(Item_func_match *func)
{
  return 1;
}

unknown's avatar
unknown committed
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
/*
  st_select_lex_node::mark_as_dependent mark all st_select_lex struct from 
  this to 'last' as dependent

  SYNOPSIS
    last - pointer to last st_select_lex struct, before wich all 
           st_select_lex have to be marked as dependent

  NOTE
    'last' should be reachable from this st_select_lex_node

*/

void st_select_lex_node::mark_as_dependent(SELECT_LEX *last)
{
  /*
    Mark all selects from resolved to 1 before select where was
    found table as depended (of select where was found table)
  */
  for (SELECT_LEX_NODE *s= this;
       s &&s != last;
       s= s->outer_select())
    if( !s->dependent )
    {
      // Select is dependent of outer select
      s->dependent= 1;
      if (s->linkage != GLOBAL_OPTIONS_TYPE)
      { 
	//s is st_select_lex*

	s->master_unit()->dependent= 1;
	//Tables will be reopened many times
	for (TABLE_LIST *tbl=
	       s->get_table_list();
	     tbl;
	     tbl= tbl->next)
	  tbl->shared= 1;
      }
    }
}

1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
bool st_select_lex_node::set_braces(bool value)      { return 1; }
bool st_select_lex_node::inc_in_sum_expr()           { return 1; }
uint st_select_lex_node::get_in_sum_expr()           { return 0; }
TABLE_LIST* st_select_lex_node::get_table_list()     { return 0; }
List<Item>* st_select_lex_node::get_item_list()      { return 0; }
List<String>* st_select_lex_node::get_use_index()    { return 0; }
List<String>* st_select_lex_node::get_ignore_index() { return 0; }
TABLE_LIST *st_select_lex_node::add_table_to_list(Table_ident *table,
						  LEX_STRING *alias,
						  bool updating,
						  thr_lock_type flags,
						  List<String> *use_index,
						  List<String> *ignore_index)
{
  return 0;
}

1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
/*
  This is used for UNION & subselect to create a new table list of all used 
  tables.
  The table_list->table entry in all used tables are set to point
  to the entries in this list.
*/

// interface
bool st_select_lex_unit::create_total_list(THD *thd, st_lex *lex,
					   TABLE_LIST **result)
{
  *result= 0;
  return create_total_list_n_last_return(thd, lex, &result);
}

// list creator
bool st_select_lex_unit::create_total_list_n_last_return(THD *thd, st_lex *lex,
							 TABLE_LIST ***result)
{
  TABLE_LIST *slave_list_first=0, **slave_list_last= &slave_list_first;
  TABLE_LIST **new_table_list= *result, *aux;
  SELECT_LEX *sl= (SELECT_LEX*)slave;
1201
  for (; sl; sl= sl->next_select())
1202 1203
  {
    // check usage of ORDER BY in union
1204
    if (sl->order_list.first && sl->next_select() && !sl->braces)
1205
    {
1206
      net_printf(thd,ER_WRONG_USAGE,"UNION","ORDER BY");
1207 1208
      return 1;
    }
unknown's avatar
unknown committed
1209 1210
    if (sl->linkage == DERIVED_TABLE_TYPE)
      continue;
1211 1212 1213 1214 1215
    for (SELECT_LEX_UNIT *inner=  sl->first_inner_unit();
	 inner;
	 inner= inner->next_unit())
      if (inner->create_total_list_n_last_return(thd, lex,
						 &slave_list_last))
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
	return 1;
    if ((aux= (TABLE_LIST*) sl->table_list.first))
    {
      TABLE_LIST *next;
      for (; aux; aux= next)
      {
	TABLE_LIST *cursor;
	next= aux->next;
	for (cursor= **result; cursor; cursor= cursor->next)
	  if (!strcmp(cursor->db, aux->db) &&
	      !strcmp(cursor->real_name, aux->real_name) &&
1227
	      !strcmp(cursor->alias, aux->alias))
1228 1229 1230 1231 1232 1233 1234
	    break;
	if (!cursor)
	{
	  /* Add not used table to the total table list */
	  if (!(cursor= (TABLE_LIST *) thd->memdup((char*) aux,
						   sizeof(*aux))))
	  {
1235
	    send_error(thd,0);
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
	    return 1;
	  }
	  *new_table_list= cursor;
	  new_table_list= &cursor->next;
	  *new_table_list= 0;			// end result list
	}
	else
	  aux->shared= 1;			// Mark that it's used twice
	aux->table_list= cursor;
      }
    }
  }
  if (slave_list_first)
  {
    *new_table_list= slave_list_first;
    new_table_list= slave_list_last;
  }
  *result= new_table_list;
  return 0;
}
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266

st_select_lex_unit* st_select_lex_unit::master_unit()
{
    return this;
}

st_select_lex* st_select_lex_unit::outer_select()
{
  return (st_select_lex*) master;
}

unknown's avatar
unknown committed
1267 1268 1269 1270
st_select_lex* st_select_lex::select_lex()
{
  return this;
}
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333

bool st_select_lex::add_item_to_list(Item *item)
{
  return item_list.push_back(item);
}

bool st_select_lex::add_group_to_list(Item *item, bool asc)
{
  return add_to_list(group_list, item, asc);
}

bool st_select_lex::add_ftfunc_to_list(Item_func_match *func)
{
  return !func || ftfunc_list->push_back(func); // end of memory?
}

st_select_lex_unit* st_select_lex::master_unit()
{
  return (st_select_lex_unit*) master;
}

st_select_lex* st_select_lex::outer_select()
{
  return (st_select_lex*) master->get_master();
}

bool st_select_lex::set_braces(bool value)
{
  braces= value;
  return 0; 
}

bool st_select_lex::inc_in_sum_expr()
{
  in_sum_expr++;
  return 0;
}

uint st_select_lex::get_in_sum_expr()
{
  return in_sum_expr;
}

TABLE_LIST* st_select_lex::get_table_list()
{
  return (TABLE_LIST*) table_list.first;
}

List<Item>* st_select_lex::get_item_list()
{
  return &item_list;
}

List<String>* st_select_lex::get_use_index()
{
  return use_index_ptr;
}

List<String>* st_select_lex::get_ignore_index()
{
  return ignore_index_ptr;
}

unknown's avatar
unknown committed
1334 1335 1336 1337
/*
  There are st_select_lex::add_table_to_list & 
  st_select_lex::set_lock_for_tables in sql_parse.cc
*/