granicus.if.org Git - postgresql/blob - src/backend/nodes/equalfuncs.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * equalfuncs.c
   4  *        Equality functions to compare node trees.
   5  *
   6  * NOTE: a general convention when copying or comparing plan nodes is
   7  * that we ignore the executor state subnode.  We do not need to look
   8  * at it because no current uses of copyObject() or equal() need to
   9  * deal with already-executing plan trees.      By leaving the state subnodes
  10  * out, we avoid needing to write copy/compare routines for all the
  11  * different executor state node types.
  12  *
  13  * Currently, in fact, equal() doesn't know how to compare Plan nodes
  14  * at all, let alone their executor-state subnodes.  This will probably
  15  * need to be fixed someday, but presently there is no need to compare
  16  * plan trees.
  17  *
  18  *
  19  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  20  * Portions Copyright (c) 1994, Regents of the University of California
  21  *
  22  * IDENTIFICATION
  23  *        $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.129 2002/04/24 02:48:54 momjian Exp $
  24  *
  25  *-------------------------------------------------------------------------
  26  */
  27
  28 #include "postgres.h"
  29
  30 #include "nodes/plannodes.h"
  31 #include "nodes/relation.h"
  32 #include "utils/datum.h"
  33
  34
  35 /* Macro for comparing string fields that might be NULL */
  36 #define equalstr(a, b)  \
  37         (((a) != NULL && (b) != NULL) ? (strcmp(a, b) == 0) : (a) == (b))
  38
  39
  40 /*
  41  *      Stuff from primnodes.h
  42  */
  43
  44 static bool
  45 _equalResdom(Resdom *a, Resdom *b)
  46 {
  47         if (a->resno != b->resno)
  48                 return false;
  49         if (a->restype != b->restype)
  50                 return false;
  51         if (a->restypmod != b->restypmod)
  52                 return false;
  53         if (!equalstr(a->resname, b->resname))
  54                 return false;
  55         if (a->ressortgroupref != b->ressortgroupref)
  56                 return false;
  57         if (a->reskey != b->reskey)
  58                 return false;
  59         if (a->reskeyop != b->reskeyop)
  60                 return false;
  61         /* we ignore resjunk flag ... is this correct? */
  62
  63         return true;
  64 }
  65
  66 static bool
  67 _equalFjoin(Fjoin *a, Fjoin *b)
  68 {
  69         int                     nNodes;
  70
  71         if (a->fj_initialized != b->fj_initialized)
  72                 return false;
  73         if (a->fj_nNodes != b->fj_nNodes)
  74                 return false;
  75         if (!equal(a->fj_innerNode, b->fj_innerNode))
  76                 return false;
  77
  78         nNodes = a->fj_nNodes;
  79         if (memcmp(a->fj_results, b->fj_results, nNodes * sizeof(Datum)) != 0)
  80                 return false;
  81         if (memcmp(a->fj_alwaysDone, b->fj_alwaysDone, nNodes * sizeof(bool)) != 0)
  82                 return false;
  83
  84         return true;
  85 }
  86
  87 static bool
  88 _equalExpr(Expr *a, Expr *b)
  89 {
  90         /*
  91          * We do not examine typeOid, since the optimizer often doesn't bother
  92          * to set it in created nodes, and it is logically a derivative of the
  93          * oper field anyway.
  94          */
  95         if (a->opType != b->opType)
  96                 return false;
  97         if (!equal(a->oper, b->oper))
  98                 return false;
  99         if (!equal(a->args, b->args))
 100                 return false;
 101
 102         return true;
 103 }
 104
 105 static bool
 106 _equalVar(Var *a, Var *b)
 107 {
 108         if (a->varno != b->varno)
 109                 return false;
 110         if (a->varattno != b->varattno)
 111                 return false;
 112         if (a->vartype != b->vartype)
 113                 return false;
 114         if (a->vartypmod != b->vartypmod)
 115                 return false;
 116         if (a->varlevelsup != b->varlevelsup)
 117                 return false;
 118         if (a->varnoold != b->varnoold)
 119                 return false;
 120         if (a->varoattno != b->varoattno)
 121                 return false;
 122
 123         return true;
 124 }
 125
 126 static bool
 127 _equalOper(Oper *a, Oper *b)
 128 {
 129         if (a->opno != b->opno)
 130                 return false;
 131         if (a->opresulttype != b->opresulttype)
 132                 return false;
 133
 134         /*
 135          * We do not examine opid or op_fcache, since these are logically
 136          * derived from opno, and they may not be set yet depending on how far
 137          * along the node is in the parse/plan pipeline.
 138          *
 139          * (Besides, op_fcache is executor state, which we don't check --- see
 140          * notes at head of file.)
 141          *
 142          * It's probably not really necessary to check opresulttype either...
 143          */
 144
 145         return true;
 146 }
 147
 148 static bool
 149 _equalConst(Const *a, Const *b)
 150 {
 151         if (a->consttype != b->consttype)
 152                 return false;
 153         if (a->constlen != b->constlen)
 154                 return false;
 155         if (a->constisnull != b->constisnull)
 156                 return false;
 157         if (a->constbyval != b->constbyval)
 158                 return false;
 159         /* XXX What about constisset and constiscast? */
 160
 161         /*
 162          * We treat all NULL constants of the same type as equal. Someday this
 163          * might need to change?  But datumIsEqual doesn't work on nulls,
 164          * so...
 165          */
 166         if (a->constisnull)
 167                 return true;
 168         return datumIsEqual(a->constvalue, b->constvalue,
 169                                                 a->constbyval, a->constlen);
 170 }
 171
 172 static bool
 173 _equalParam(Param *a, Param *b)
 174 {
 175         if (a->paramkind != b->paramkind)
 176                 return false;
 177         if (a->paramtype != b->paramtype)
 178                 return false;
 179
 180         switch (a->paramkind)
 181         {
 182                 case PARAM_NAMED:
 183                 case PARAM_NEW:
 184                 case PARAM_OLD:
 185                         if (strcmp(a->paramname, b->paramname) != 0)
 186                                 return false;
 187                         break;
 188                 case PARAM_NUM:
 189                 case PARAM_EXEC:
 190                         if (a->paramid != b->paramid)
 191                                 return false;
 192                         break;
 193                 case PARAM_INVALID:
 194
 195                         /*
 196                          * XXX: Hmmm... What are we supposed to return in this case ??
 197                          */
 198                         return true;
 199                         break;
 200                 default:
 201                         elog(ERROR, "_equalParam: Invalid paramkind value: %d",
 202                                  a->paramkind);
 203         }
 204
 205         return true;
 206 }
 207
 208 static bool
 209 _equalFunc(Func *a, Func *b)
 210 {
 211         if (a->funcid != b->funcid)
 212                 return false;
 213         if (a->functype != b->functype)
 214                 return false;
 215         /* Note we do not look at func_fcache; see notes for _equalOper */
 216
 217         return true;
 218 }
 219
 220 static bool
 221 _equalAggref(Aggref *a, Aggref *b)
 222 {
 223         if (a->aggfnoid != b->aggfnoid)
 224                 return false;
 225         if (a->aggtype != b->aggtype)
 226                 return false;
 227         if (!equal(a->target, b->target))
 228                 return false;
 229         if (a->aggstar != b->aggstar)
 230                 return false;
 231         if (a->aggdistinct != b->aggdistinct)
 232                 return false;
 233         /* ignore aggno, which is only a private field for the executor */
 234         return true;
 235 }
 236
 237 static bool
 238 _equalSubLink(SubLink *a, SubLink *b)
 239 {
 240         if (a->subLinkType != b->subLinkType)
 241                 return false;
 242         if (a->useor != b->useor)
 243                 return false;
 244         if (!equal(a->lefthand, b->lefthand))
 245                 return false;
 246         if (!equal(a->oper, b->oper))
 247                 return false;
 248         if (!equal(a->subselect, b->subselect))
 249                 return false;
 250         return true;
 251 }
 252
 253 static bool
 254 _equalArrayRef(ArrayRef *a, ArrayRef *b)
 255 {
 256         if (a->refelemtype != b->refelemtype)
 257                 return false;
 258         if (a->refattrlength != b->refattrlength)
 259                 return false;
 260         if (a->refelemlength != b->refelemlength)
 261                 return false;
 262         if (a->refelembyval != b->refelembyval)
 263                 return false;
 264         if (!equal(a->refupperindexpr, b->refupperindexpr))
 265                 return false;
 266         if (!equal(a->reflowerindexpr, b->reflowerindexpr))
 267                 return false;
 268         if (!equal(a->refexpr, b->refexpr))
 269                 return false;
 270         return equal(a->refassgnexpr, b->refassgnexpr);
 271 }
 272
 273 static bool
 274 _equalFieldSelect(FieldSelect *a, FieldSelect *b)
 275 {
 276         if (!equal(a->arg, b->arg))
 277                 return false;
 278         if (a->fieldnum != b->fieldnum)
 279                 return false;
 280         if (a->resulttype != b->resulttype)
 281                 return false;
 282         if (a->resulttypmod != b->resulttypmod)
 283                 return false;
 284         return true;
 285 }
 286
 287 static bool
 288 _equalRelabelType(RelabelType *a, RelabelType *b)
 289 {
 290         if (!equal(a->arg, b->arg))
 291                 return false;
 292         if (a->resulttype != b->resulttype)
 293                 return false;
 294         if (a->resulttypmod != b->resulttypmod)
 295                 return false;
 296         return true;
 297 }
 298
 299 static bool
 300 _equalRangeTblRef(RangeTblRef *a, RangeTblRef *b)
 301 {
 302         if (a->rtindex != b->rtindex)
 303                 return false;
 304
 305         return true;
 306 }
 307
 308 static bool
 309 _equalFromExpr(FromExpr *a, FromExpr *b)
 310 {
 311         if (!equal(a->fromlist, b->fromlist))
 312                 return false;
 313         if (!equal(a->quals, b->quals))
 314                 return false;
 315
 316         return true;
 317 }
 318
 319 static bool
 320 _equalJoinExpr(JoinExpr *a, JoinExpr *b)
 321 {
 322         if (a->jointype != b->jointype)
 323                 return false;
 324         if (a->isNatural != b->isNatural)
 325                 return false;
 326         if (!equal(a->larg, b->larg))
 327                 return false;
 328         if (!equal(a->rarg, b->rarg))
 329                 return false;
 330         if (!equal(a->using, b->using))
 331                 return false;
 332         if (!equal(a->quals, b->quals))
 333                 return false;
 334         if (!equal(a->alias, b->alias))
 335                 return false;
 336         if (a->rtindex != b->rtindex)
 337                 return false;
 338
 339         return true;
 340 }
 341
 342 /*
 343  * Stuff from relation.h
 344  */
 345
 346 static bool
 347 _equalRelOptInfo(RelOptInfo *a, RelOptInfo *b)
 348 {
 349         /*
 350          * We treat RelOptInfos as equal if they refer to the same base rels
 351          * joined in the same order.  Is this appropriate/sufficient?
 352          */
 353         return equali(a->relids, b->relids);
 354 }
 355
 356 static bool
 357 _equalIndexOptInfo(IndexOptInfo *a, IndexOptInfo *b)
 358 {
 359         /*
 360          * We treat IndexOptInfos as equal if they refer to the same index. Is
 361          * this sufficient?
 362          */
 363         if (a->indexoid != b->indexoid)
 364                 return false;
 365         return true;
 366 }
 367
 368 static bool
 369 _equalPathKeyItem(PathKeyItem *a, PathKeyItem *b)
 370 {
 371         if (a->sortop != b->sortop)
 372                 return false;
 373         if (!equal(a->key, b->key))
 374                 return false;
 375         return true;
 376 }
 377
 378 static bool
 379 _equalPath(Path *a, Path *b)
 380 {
 381         if (a->pathtype != b->pathtype)
 382                 return false;
 383         if (!equal(a->parent, b->parent))
 384                 return false;
 385
 386         /*
 387          * do not check path costs, since they may not be set yet, and being
 388          * float values there are roundoff error issues anyway...
 389          */
 390         if (!equal(a->pathkeys, b->pathkeys))
 391                 return false;
 392         return true;
 393 }
 394
 395 static bool
 396 _equalIndexPath(IndexPath *a, IndexPath *b)
 397 {
 398         if (!_equalPath((Path *) a, (Path *) b))
 399                 return false;
 400         if (!equal(a->indexinfo, b->indexinfo))
 401                 return false;
 402         if (!equal(a->indexqual, b->indexqual))
 403                 return false;
 404         if (a->indexscandir != b->indexscandir)
 405                 return false;
 406         if (!equali(a->joinrelids, b->joinrelids))
 407                 return false;
 408         if (a->alljoinquals != b->alljoinquals)
 409                 return false;
 410
 411         /*
 412          * Skip 'rows' because of possibility of floating-point roundoff
 413          * error. It should be derivable from the other fields anyway.
 414          */
 415         return true;
 416 }
 417
 418 static bool
 419 _equalTidPath(TidPath *a, TidPath *b)
 420 {
 421         if (!_equalPath((Path *) a, (Path *) b))
 422                 return false;
 423         if (!equal(a->tideval, b->tideval))
 424                 return false;
 425         if (!equali(a->unjoined_relids, b->unjoined_relids))
 426                 return false;
 427         return true;
 428 }
 429
 430 static bool
 431 _equalAppendPath(AppendPath *a, AppendPath *b)
 432 {
 433         if (!_equalPath((Path *) a, (Path *) b))
 434                 return false;
 435         if (!equal(a->subpaths, b->subpaths))
 436                 return false;
 437         return true;
 438 }
 439
 440 static bool
 441 _equalJoinPath(JoinPath *a, JoinPath *b)
 442 {
 443         if (!_equalPath((Path *) a, (Path *) b))
 444                 return false;
 445         if (a->jointype != b->jointype)
 446                 return false;
 447         if (!equal(a->outerjoinpath, b->outerjoinpath))
 448                 return false;
 449         if (!equal(a->innerjoinpath, b->innerjoinpath))
 450                 return false;
 451         if (!equal(a->joinrestrictinfo, b->joinrestrictinfo))
 452                 return false;
 453         return true;
 454 }
 455
 456 static bool
 457 _equalNestPath(NestPath *a, NestPath *b)
 458 {
 459         if (!_equalJoinPath((JoinPath *) a, (JoinPath *) b))
 460                 return false;
 461         return true;
 462 }
 463
 464 static bool
 465 _equalMergePath(MergePath *a, MergePath *b)
 466 {
 467         if (!_equalJoinPath((JoinPath *) a, (JoinPath *) b))
 468                 return false;
 469         if (!equal(a->path_mergeclauses, b->path_mergeclauses))
 470                 return false;
 471         if (!equal(a->outersortkeys, b->outersortkeys))
 472                 return false;
 473         if (!equal(a->innersortkeys, b->innersortkeys))
 474                 return false;
 475         return true;
 476 }
 477
 478 static bool
 479 _equalHashPath(HashPath *a, HashPath *b)
 480 {
 481         if (!_equalJoinPath((JoinPath *) a, (JoinPath *) b))
 482                 return false;
 483         if (!equal(a->path_hashclauses, b->path_hashclauses))
 484                 return false;
 485         return true;
 486 }
 487
 488 static bool
 489 _equalSubPlan(SubPlan *a, SubPlan *b)
 490 {
 491         /* should compare plans, but have to settle for comparing plan IDs */
 492         if (a->plan_id != b->plan_id)
 493                 return false;
 494
 495         if (!equal(a->rtable, b->rtable))
 496                 return false;
 497
 498         if (!equal(a->sublink, b->sublink))
 499                 return false;
 500
 501         return true;
 502 }
 503
 504 static bool
 505 _equalRestrictInfo(RestrictInfo *a, RestrictInfo *b)
 506 {
 507         if (!equal(a->clause, b->clause))
 508                 return false;
 509         if (a->ispusheddown != b->ispusheddown)
 510                 return false;
 511
 512         /*
 513          * We ignore eval_cost, this_selec, left/right_pathkey, and
 514          * left/right_bucketsize, since they may not be set yet, and should be
 515          * derivable from the clause anyway.  Probably it's not really
 516          * necessary to compare any of these remaining fields ...
 517          */
 518         if (!equal(a->subclauseindices, b->subclauseindices))
 519                 return false;
 520         if (a->mergejoinoperator != b->mergejoinoperator)
 521                 return false;
 522         if (a->left_sortop != b->left_sortop)
 523                 return false;
 524         if (a->right_sortop != b->right_sortop)
 525                 return false;
 526         if (a->hashjoinoperator != b->hashjoinoperator)
 527                 return false;
 528         return true;
 529 }
 530
 531 static bool
 532 _equalJoinInfo(JoinInfo *a, JoinInfo *b)
 533 {
 534         if (!equali(a->unjoined_relids, b->unjoined_relids))
 535                 return false;
 536         if (!equal(a->jinfo_restrictinfo, b->jinfo_restrictinfo))
 537                 return false;
 538         return true;
 539 }
 540
 541 static bool
 542 _equalIter(Iter *a, Iter *b)
 543 {
 544         return equal(a->iterexpr, b->iterexpr);
 545 }
 546
 547 static bool
 548 _equalStream(Stream *a, Stream *b)
 549 {
 550         if (a->clausetype != b->clausetype)
 551                 return false;
 552         if (a->groupup != b->groupup)
 553                 return false;
 554         if (a->groupcost != b->groupcost)
 555                 return false;
 556         if (a->groupsel != b->groupsel)
 557                 return false;
 558         if (!equal(a->pathptr, b->pathptr))
 559                 return false;
 560         if (!equal(a->cinfo, b->cinfo))
 561                 return false;
 562         if (!equal(a->upstream, b->upstream))
 563                 return false;
 564         return equal(a->downstream, b->downstream);
 565 }
 566
 567 /*
 568  * Stuff from parsenodes.h
 569  */
 570
 571 static bool
 572 _equalQuery(Query *a, Query *b)
 573 {
 574         if (a->commandType != b->commandType)
 575                 return false;
 576         if (!equal(a->utilityStmt, b->utilityStmt))
 577                 return false;
 578         if (a->resultRelation != b->resultRelation)
 579                 return false;
 580         if (!equal(a->into, b->into))
 581                 return false;
 582         if (a->isPortal != b->isPortal)
 583                 return false;
 584         if (a->isBinary != b->isBinary)
 585                 return false;
 586         if (a->hasAggs != b->hasAggs)
 587                 return false;
 588         if (a->hasSubLinks != b->hasSubLinks)
 589                 return false;
 590         /* we deliberately ignore originalQuery */
 591         if (!equal(a->rtable, b->rtable))
 592                 return false;
 593         if (!equal(a->jointree, b->jointree))
 594                 return false;
 595         if (!equali(a->rowMarks, b->rowMarks))
 596                 return false;
 597         if (!equal(a->targetList, b->targetList))
 598                 return false;
 599         if (!equal(a->groupClause, b->groupClause))
 600                 return false;
 601         if (!equal(a->havingQual, b->havingQual))
 602                 return false;
 603         if (!equal(a->distinctClause, b->distinctClause))
 604                 return false;
 605         if (!equal(a->sortClause, b->sortClause))
 606                 return false;
 607         if (!equal(a->limitOffset, b->limitOffset))
 608                 return false;
 609         if (!equal(a->limitCount, b->limitCount))
 610                 return false;
 611         if (!equal(a->setOperations, b->setOperations))
 612                 return false;
 613         if (!equali(a->resultRelations, b->resultRelations))
 614                 return false;
 615
 616         /*
 617          * We do not check the internal-to-the-planner fields: base_rel_list,
 618          * other_rel_list, join_rel_list, equi_key_list, query_pathkeys. They
 619          * might not be set yet, and in any case they should be derivable from
 620          * the other fields.
 621          */
 622         return true;
 623 }
 624
 625 static bool
 626 _equalInsertStmt(InsertStmt *a, InsertStmt *b)
 627 {
 628         if (!equal(a->relation, b->relation))
 629                 return false;
 630         if (!equal(a->cols, b->cols))
 631                 return false;
 632         if (!equal(a->targetList, b->targetList))
 633                 return false;
 634         if (!equal(a->selectStmt, b->selectStmt))
 635                 return false;
 636
 637         return true;
 638 }
 639
 640 static bool
 641 _equalDeleteStmt(DeleteStmt *a, DeleteStmt *b)
 642 {
 643         if (!equal(a->relation, b->relation))
 644                 return false;
 645         if (!equal(a->whereClause, b->whereClause))
 646                 return false;
 647
 648         return true;
 649 }
 650
 651 static bool
 652 _equalUpdateStmt(UpdateStmt *a, UpdateStmt *b)
 653 {
 654         if (!equal(a->relation, b->relation))
 655                 return false;
 656         if (!equal(a->targetList, b->targetList))
 657                 return false;
 658         if (!equal(a->whereClause, b->whereClause))
 659                 return false;
 660         if (!equal(a->fromClause, b->fromClause))
 661                 return false;
 662
 663         return true;
 664 }
 665
 666 static bool
 667 _equalSelectStmt(SelectStmt *a, SelectStmt *b)
 668 {
 669         if (!equal(a->distinctClause, b->distinctClause))
 670                 return false;
 671         if (!equal(a->into, b->into))
 672                 return false;
 673         if (!equal(a->intoColNames, b->intoColNames))
 674                 return false;
 675         if (!equal(a->targetList, b->targetList))
 676                 return false;
 677         if (!equal(a->fromClause, b->fromClause))
 678                 return false;
 679         if (!equal(a->whereClause, b->whereClause))
 680                 return false;
 681         if (!equal(a->groupClause, b->groupClause))
 682                 return false;
 683         if (!equal(a->havingClause, b->havingClause))
 684                 return false;
 685         if (!equal(a->sortClause, b->sortClause))
 686                 return false;
 687         if (!equalstr(a->portalname, b->portalname))
 688                 return false;
 689         if (a->binary != b->binary)
 690                 return false;
 691         if (!equal(a->limitOffset, b->limitOffset))
 692                 return false;
 693         if (!equal(a->limitCount, b->limitCount))
 694                 return false;
 695         if (!equal(a->forUpdate, b->forUpdate))
 696                 return false;
 697         if (a->op != b->op)
 698                 return false;
 699         if (a->all != b->all)
 700                 return false;
 701         if (!equal(a->larg, b->larg))
 702                 return false;
 703         if (!equal(a->rarg, b->rarg))
 704                 return false;
 705
 706         return true;
 707 }
 708
 709 static bool
 710 _equalSetOperationStmt(SetOperationStmt *a, SetOperationStmt *b)
 711 {
 712         if (a->op != b->op)
 713                 return false;
 714         if (a->all != b->all)
 715                 return false;
 716         if (!equal(a->larg, b->larg))
 717                 return false;
 718         if (!equal(a->rarg, b->rarg))
 719                 return false;
 720         if (!equali(a->colTypes, b->colTypes))
 721                 return false;
 722
 723         return true;
 724 }
 725
 726 static bool
 727 _equalAlterTableStmt(AlterTableStmt *a, AlterTableStmt *b)
 728 {
 729         if (a->subtype != b->subtype)
 730                 return false;
 731         if (!equal(a->relation, b->relation))
 732                 return false;
 733         if (!equalstr(a->name, b->name))
 734                 return false;
 735         if (!equal(a->def, b->def))
 736                 return false;
 737         if (a->behavior != b->behavior)
 738                 return false;
 739
 740         return true;
 741 }
 742
 743 static bool
 744 _equalGrantStmt(GrantStmt *a, GrantStmt *b)
 745 {
 746         if (a->is_grant != b->is_grant)
 747                 return false;
 748         if (a->objtype != b->objtype)
 749                 return false;
 750         if (!equal(a->objects, b->objects))
 751                 return false;
 752         if (!equali(a->privileges, b->privileges))
 753                 return false;
 754         if (!equal(a->grantees, b->grantees))
 755                 return false;
 756
 757         return true;
 758 }
 759
 760 static bool
 761 _equalPrivGrantee(PrivGrantee *a, PrivGrantee *b)
 762 {
 763         return equalstr(a->username, b->username)
 764                 && equalstr(a->groupname, b->groupname);
 765 }
 766
 767 static bool
 768 _equalFuncWithArgs(FuncWithArgs *a, FuncWithArgs *b)
 769 {
 770         return equal(a->funcname, b->funcname)
 771                 && equal(a->funcargs, b->funcargs);
 772 }
 773
 774 static bool
 775 _equalInsertDefault(InsertDefault *a, InsertDefault *b)
 776 {
 777         return true;
 778 }
 779
 780 static bool
 781 _equalClosePortalStmt(ClosePortalStmt *a, ClosePortalStmt *b)
 782 {
 783         if (!equalstr(a->portalname, b->portalname))
 784                 return false;
 785
 786         return true;
 787 }
 788
 789 static bool
 790 _equalClusterStmt(ClusterStmt *a, ClusterStmt *b)
 791 {
 792         if (!equal(a->relation, b->relation))
 793                 return false;
 794         if (!equalstr(a->indexname, b->indexname))
 795                 return false;
 796
 797         return true;
 798 }
 799
 800 static bool
 801 _equalCopyStmt(CopyStmt *a, CopyStmt *b)
 802 {
 803         if (a->binary != b->binary)
 804                 return false;
 805         if (!equal(a->relation, b->relation))
 806                 return false;
 807         if (a->oids != b->oids)
 808                 return false;
 809         if (a->direction != b->direction)
 810                 return false;
 811         if (!equalstr(a->filename, b->filename))
 812                 return false;
 813         if (!equalstr(a->delimiter, b->delimiter))
 814                 return false;
 815         if (!equalstr(a->null_print, b->null_print))
 816                 return false;
 817
 818         return true;
 819 }
 820
 821 static bool
 822 _equalCreateStmt(CreateStmt *a, CreateStmt *b)
 823 {
 824         if (!equal(a->relation, b->relation))
 825                 return false;
 826         if (!equal(a->tableElts, b->tableElts))
 827                 return false;
 828         if (!equal(a->inhRelations, b->inhRelations))
 829                 return false;
 830         if (!equal(a->constraints, b->constraints))
 831                 return false;
 832         if (a->hasoids != b->hasoids)
 833                 return false;
 834
 835         return true;
 836 }
 837
 838 static bool
 839 _equalDefineStmt(DefineStmt *a, DefineStmt *b)
 840 {
 841         if (a->defType != b->defType)
 842                 return false;
 843         if (!equal(a->defnames, b->defnames))
 844                 return false;
 845         if (!equal(a->definition, b->definition))
 846                 return false;
 847
 848         return true;
 849 }
 850
 851 static bool
 852 _equalDropStmt(DropStmt *a, DropStmt *b)
 853 {
 854         if (!equal(a->objects, b->objects))
 855                 return false;
 856         if (a->removeType != b->removeType)
 857                 return false;
 858         if (a->behavior != b->behavior)
 859                 return false;
 860
 861         return true;
 862 }
 863
 864 static bool
 865 _equalTruncateStmt(TruncateStmt *a, TruncateStmt *b)
 866 {
 867         if (!equal(a->relation, b->relation))
 868                 return false;
 869
 870         return true;
 871 }
 872
 873 static bool
 874 _equalCommentStmt(CommentStmt *a, CommentStmt *b)
 875 {
 876         if (a->objtype != b->objtype)
 877                 return false;
 878         if (!equal(a->objname, b->objname))
 879                 return false;
 880         if (!equal(a->objargs, b->objargs))
 881                 return false;
 882         if (!equalstr(a->comment, b->comment))
 883                 return false;
 884
 885         return true;
 886 }
 887
 888 static bool
 889 _equalFetchStmt(FetchStmt *a, FetchStmt *b)
 890 {
 891         if (a->direction != b->direction)
 892                 return false;
 893         if (a->howMany != b->howMany)
 894                 return false;
 895         if (!equalstr(a->portalname, b->portalname))
 896                 return false;
 897         if (a->ismove != b->ismove)
 898                 return false;
 899
 900         return true;
 901 }
 902
 903 static bool
 904 _equalIndexStmt(IndexStmt *a, IndexStmt *b)
 905 {
 906         if (!equalstr(a->idxname, b->idxname))
 907                 return false;
 908         if (!equal(a->relation, b->relation))
 909                 return false;
 910         if (!equalstr(a->accessMethod, b->accessMethod))
 911                 return false;
 912         if (!equal(a->indexParams, b->indexParams))
 913                 return false;
 914         if (!equal(a->whereClause, b->whereClause))
 915                 return false;
 916         if (!equal(a->rangetable, b->rangetable))
 917                 return false;
 918         if (a->unique != b->unique)
 919                 return false;
 920         if (a->primary != b->primary)
 921                 return false;
 922
 923         return true;
 924 }
 925
 926 static bool
 927 _equalProcedureStmt(ProcedureStmt *a, ProcedureStmt *b)
 928 {
 929         if (a->replace != b->replace)
 930                 return false;
 931         if (!equal(a->funcname, b->funcname))
 932                 return false;
 933         if (!equal(a->argTypes, b->argTypes))
 934                 return false;
 935         if (!equal(a->returnType, b->returnType))
 936                 return false;
 937         if (!equal(a->withClause, b->withClause))
 938                 return false;
 939         if (!equal(a->as, b->as))
 940                 return false;
 941         if (!equalstr(a->language, b->language))
 942                 return false;
 943
 944         return true;
 945 }
 946
 947 static bool
 948 _equalRemoveAggrStmt(RemoveAggrStmt *a, RemoveAggrStmt *b)
 949 {
 950         if (!equal(a->aggname, b->aggname))
 951                 return false;
 952         if (!equal(a->aggtype, b->aggtype))
 953                 return false;
 954
 955         return true;
 956 }
 957
 958 static bool
 959 _equalRemoveFuncStmt(RemoveFuncStmt *a, RemoveFuncStmt *b)
 960 {
 961         if (!equal(a->funcname, b->funcname))
 962                 return false;
 963         if (!equal(a->args, b->args))
 964                 return false;
 965
 966         return true;
 967 }
 968
 969 static bool
 970 _equalRemoveOperStmt(RemoveOperStmt *a, RemoveOperStmt *b)
 971 {
 972         if (!equal(a->opname, b->opname))
 973                 return false;
 974         if (!equal(a->args, b->args))
 975                 return false;
 976
 977         return true;
 978 }
 979
 980
 981 static bool
 982 _equalRenameStmt(RenameStmt *a, RenameStmt *b)
 983 {
 984         if (!equal(a->relation, b->relation))
 985                 return false;
 986         if (!equalstr(a->oldname, b->oldname))
 987                 return false;
 988         if (!equalstr(a->newname, b->newname))
 989                 return false;
 990         if (a->renameType != b->renameType)
 991                 return false;
 992
 993         return true;
 994 }
 995
 996 static bool
 997 _equalRuleStmt(RuleStmt *a, RuleStmt *b)
 998 {
 999         if (!equal(a->relation, b->relation))
1000                 return false;
1001         if (!equalstr(a->rulename, b->rulename))
1002                 return false;
1003         if (!equal(a->whereClause, b->whereClause))
1004                 return false;
1005         if (a->event != b->event)
1006                 return false;
1007         if (a->instead != b->instead)
1008                 return false;
1009         if (!equal(a->actions, b->actions))
1010                 return false;
1011
1012         return true;
1013 }
1014
1015 static bool
1016 _equalNotifyStmt(NotifyStmt *a, NotifyStmt *b)
1017 {
1018         if (!equal(a->relation, b->relation))
1019                 return false;
1020
1021         return true;
1022 }
1023
1024 static bool
1025 _equalListenStmt(ListenStmt *a, ListenStmt *b)
1026 {
1027         if (!equal(a->relation, b->relation))
1028                 return false;
1029
1030         return true;
1031 }
1032
1033 static bool
1034 _equalUnlistenStmt(UnlistenStmt *a, UnlistenStmt *b)
1035 {
1036         if (!equal(a->relation, b->relation))
1037                 return false;
1038
1039         return true;
1040 }
1041
1042 static bool
1043 _equalTransactionStmt(TransactionStmt *a, TransactionStmt *b)
1044 {
1045         if (a->command != b->command)
1046                 return false;
1047
1048         return true;
1049 }
1050
1051 static bool
1052 _equalViewStmt(ViewStmt *a, ViewStmt *b)
1053 {
1054         if (!equal(a->view, b->view))
1055                 return false;
1056         if (!equal(a->aliases, b->aliases))
1057                 return false;
1058         if (!equal(a->query, b->query))
1059                 return false;
1060
1061         return true;
1062 }
1063
1064 static bool
1065 _equalLoadStmt(LoadStmt *a, LoadStmt *b)
1066 {
1067         if (!equalstr(a->filename, b->filename))
1068                 return false;
1069
1070         return true;
1071 }
1072
1073 static bool
1074 _equalCreateDomainStmt(CreateDomainStmt *a, CreateDomainStmt *b)
1075 {
1076         if (!equal(a->domainname, b->domainname))
1077                 return false;
1078         if (!equal(a->typename, b->typename))
1079                 return false;
1080         if (!equal(a->constraints, b->constraints))
1081                 return false;
1082
1083         return true;
1084 }
1085
1086 static bool
1087 _equalCreatedbStmt(CreatedbStmt *a, CreatedbStmt *b)
1088 {
1089         if (!equalstr(a->dbname, b->dbname))
1090                 return false;
1091         if (!equalstr(a->dbowner, b->dbowner))
1092                 return false;
1093         if (!equalstr(a->dbpath, b->dbpath))
1094                 return false;
1095         if (!equalstr(a->dbtemplate, b->dbtemplate))
1096                 return false;
1097         if (a->encoding != b->encoding)
1098                 return false;
1099
1100         return true;
1101 }
1102
1103 static bool
1104 _equalAlterDatabaseSetStmt(AlterDatabaseSetStmt *a, AlterDatabaseSetStmt *b)
1105 {
1106         if (!equalstr(a->dbname, b->dbname))
1107                 return false;
1108         if (!equalstr(a->variable, b->variable))
1109                 return false;
1110         if (!equal(a->value, b->value))
1111                 return false;
1112
1113         return true;
1114 }
1115
1116 static bool
1117 _equalDropdbStmt(DropdbStmt *a, DropdbStmt *b)
1118 {
1119         if (!equalstr(a->dbname, b->dbname))
1120                 return false;
1121
1122         return true;
1123 }
1124
1125 static bool
1126 _equalVacuumStmt(VacuumStmt *a, VacuumStmt *b)
1127 {
1128         if (a->vacuum != b->vacuum)
1129                 return false;
1130         if (a->full != b->full)
1131                 return false;
1132         if (a->analyze != b->analyze)
1133                 return false;
1134         if (a->freeze != b->freeze)
1135                 return false;
1136         if (a->verbose != b->verbose)
1137                 return false;
1138         if (!equal(a->relation, b->relation))
1139                 return false;
1140         if (!equal(a->va_cols, b->va_cols))
1141                 return false;
1142
1143         return true;
1144 }
1145
1146 static bool
1147 _equalExplainStmt(ExplainStmt *a, ExplainStmt *b)
1148 {
1149         if (!equal(a->query, b->query))
1150                 return false;
1151         if (a->verbose != b->verbose)
1152                 return false;
1153         if (a->analyze != b->analyze)
1154                 return false;
1155
1156         return true;
1157 }
1158
1159 static bool
1160 _equalCreateSeqStmt(CreateSeqStmt *a, CreateSeqStmt *b)
1161 {
1162         if (!equal(a->sequence, b->sequence))
1163                 return false;
1164         if (!equal(a->options, b->options))
1165                 return false;
1166
1167         return true;
1168 }
1169
1170 static bool
1171 _equalVariableSetStmt(VariableSetStmt *a, VariableSetStmt *b)
1172 {
1173         if (!equalstr(a->name, b->name))
1174                 return false;
1175         if (!equal(a->args, b->args))
1176                 return false;
1177
1178         return true;
1179 }
1180
1181 static bool
1182 _equalVariableShowStmt(VariableShowStmt *a, VariableShowStmt *b)
1183 {
1184         if (!equalstr(a->name, b->name))
1185                 return false;
1186
1187         return true;
1188 }
1189
1190 static bool
1191 _equalVariableResetStmt(VariableResetStmt *a, VariableResetStmt *b)
1192 {
1193         if (!equalstr(a->name, b->name))
1194                 return false;
1195
1196         return true;
1197 }
1198
1199 static bool
1200 _equalCreateTrigStmt(CreateTrigStmt *a, CreateTrigStmt *b)
1201 {
1202         if (!equalstr(a->trigname, b->trigname))
1203                 return false;
1204         if (!equal(a->relation, b->relation))
1205                 return false;
1206         if (!equal(a->funcname, b->funcname))
1207                 return false;
1208         if (!equal(a->args, b->args))
1209                 return false;
1210         if (a->before != b->before)
1211                 return false;
1212         if (a->row != b->row)
1213                 return false;
1214         if (strcmp(a->actions, b->actions) != 0)
1215                 return false;
1216         if (!equalstr(a->lang, b->lang))
1217                 return false;
1218         if (!equalstr(a->text, b->text))
1219                 return false;
1220         if (!equal(a->attr, b->attr))
1221                 return false;
1222         if (!equalstr(a->when, b->when))
1223                 return false;
1224         if (a->isconstraint != b->isconstraint)
1225                 return false;
1226         if (a->deferrable != b->deferrable)
1227                 return false;
1228         if (a->initdeferred != b->initdeferred)
1229                 return false;
1230         if (!equal(a->constrrel, b->constrrel))
1231                 return false;
1232
1233         return true;
1234 }
1235
1236 static bool
1237 _equalDropPropertyStmt(DropPropertyStmt *a, DropPropertyStmt *b)
1238 {
1239         if (!equal(a->relation, b->relation))
1240                 return false;
1241         if (!equalstr(a->property, b->property))
1242                 return false;
1243         if (a->removeType != b->removeType)
1244                 return false;
1245
1246         return true;
1247 }
1248
1249 static bool
1250 _equalCreatePLangStmt(CreatePLangStmt *a, CreatePLangStmt *b)
1251 {
1252         if (!equalstr(a->plname, b->plname))
1253                 return false;
1254         if (!equal(a->plhandler, b->plhandler))
1255                 return false;
1256         if (!equalstr(a->plcompiler, b->plcompiler))
1257                 return false;
1258         if (a->pltrusted != b->pltrusted)
1259                 return false;
1260
1261         return true;
1262 }
1263
1264 static bool
1265 _equalDropPLangStmt(DropPLangStmt *a, DropPLangStmt *b)
1266 {
1267         if (!equalstr(a->plname, b->plname))
1268                 return false;
1269
1270         return true;
1271 }
1272
1273 static bool
1274 _equalCreateUserStmt(CreateUserStmt *a, CreateUserStmt *b)
1275 {
1276         if (!equalstr(a->user, b->user))
1277                 return false;
1278         if (!equal(a->options, b->options))
1279                 return false;
1280
1281         return true;
1282 }
1283
1284 static bool
1285 _equalAlterUserStmt(AlterUserStmt *a, AlterUserStmt *b)
1286 {
1287         if (!equalstr(a->user, b->user))
1288                 return false;
1289         if (!equal(a->options, b->options))
1290                 return false;
1291
1292         return true;
1293 }
1294
1295 static bool
1296 _equalAlterUserSetStmt(AlterUserSetStmt *a, AlterUserSetStmt *b)
1297 {
1298         if (!equalstr(a->user, b->user))
1299                 return false;
1300         if (!equalstr(a->variable, b->variable))
1301                 return false;
1302         if (!equal(a->value, b->value))
1303                 return false;
1304
1305         return true;
1306 }
1307
1308 static bool
1309 _equalDropUserStmt(DropUserStmt *a, DropUserStmt *b)
1310 {
1311         if (!equal(a->users, b->users))
1312                 return false;
1313
1314         return true;
1315 }
1316
1317 static bool
1318 _equalLockStmt(LockStmt *a, LockStmt *b)
1319 {
1320         if (!equal(a->relations, b->relations))
1321                 return false;
1322         if (a->mode != b->mode)
1323                 return false;
1324
1325         return true;
1326 }
1327
1328 static bool
1329 _equalConstraintsSetStmt(ConstraintsSetStmt *a, ConstraintsSetStmt *b)
1330 {
1331         if (!equal(a->constraints, b->constraints))
1332                 return false;
1333         if (a->deferred != b->deferred)
1334                 return false;
1335
1336         return true;
1337 }
1338
1339 static bool
1340 _equalCreateGroupStmt(CreateGroupStmt *a, CreateGroupStmt *b)
1341 {
1342         if (!equalstr(a->name, b->name))
1343                 return false;
1344         if (!equal(a->options, b->options))
1345                 return false;
1346
1347         return true;
1348 }
1349
1350 static bool
1351 _equalAlterGroupStmt(AlterGroupStmt *a, AlterGroupStmt *b)
1352 {
1353         if (!equalstr(a->name, b->name))
1354                 return false;
1355         if (a->action != b->action)
1356                 return false;
1357         if (!equal(a->listUsers, b->listUsers))
1358                 return false;
1359
1360         return true;
1361 }
1362
1363 static bool
1364 _equalDropGroupStmt(DropGroupStmt *a, DropGroupStmt *b)
1365 {
1366         if (!equalstr(a->name, b->name))
1367                 return false;
1368
1369         return true;
1370 }
1371
1372 static bool
1373 _equalReindexStmt(ReindexStmt *a, ReindexStmt *b)
1374 {
1375         if (a->reindexType != b->reindexType)
1376                 return false;
1377         if (!equal(a->relation, b->relation))
1378                 return false;
1379         if (!equalstr(a->name, b->name))
1380                 return false;
1381         if (a->force != b->force)
1382                 return false;
1383         if (a->all != b->all)
1384                 return false;
1385
1386         return true;
1387 }
1388
1389 static bool
1390 _equalCreateSchemaStmt(CreateSchemaStmt *a, CreateSchemaStmt *b)
1391 {
1392         if (!equalstr(a->schemaname, b->schemaname))
1393                 return false;
1394         if (!equalstr(a->authid, b->authid))
1395                 return false;
1396         if (!equal(a->schemaElts, b->schemaElts))
1397                 return false;
1398
1399         return true;
1400 }
1401
1402 static bool
1403 _equalAExpr(A_Expr *a, A_Expr *b)
1404 {
1405         if (a->oper != b->oper)
1406                 return false;
1407         if (!equal(a->name, b->name))
1408                 return false;
1409         if (!equal(a->lexpr, b->lexpr))
1410                 return false;
1411         if (!equal(a->rexpr, b->rexpr))
1412                 return false;
1413
1414         return true;
1415 }
1416
1417 static bool
1418 _equalColumnRef(ColumnRef *a, ColumnRef *b)
1419 {
1420         if (!equal(a->fields, b->fields))
1421                 return false;
1422         if (!equal(a->indirection, b->indirection))
1423                 return false;
1424
1425         return true;
1426 }
1427
1428 static bool
1429 _equalParamRef(ParamRef *a, ParamRef *b)
1430 {
1431         if (a->number != b->number)
1432                 return false;
1433         if (!equal(a->fields, b->fields))
1434                 return false;
1435         if (!equal(a->indirection, b->indirection))
1436                 return false;
1437
1438         return true;
1439 }
1440
1441 static bool
1442 _equalAConst(A_Const *a, A_Const *b)
1443 {
1444         if (!equal(&a->val, &b->val))
1445                 return false;
1446         if (!equal(a->typename, b->typename))
1447                 return false;
1448
1449         return true;
1450 }
1451
1452 static bool
1453 _equalIdent(Ident *a, Ident *b)
1454 {
1455         if (!equalstr(a->name, b->name))
1456                 return false;
1457
1458         return true;
1459 }
1460
1461 static bool
1462 _equalFuncCall(FuncCall *a, FuncCall *b)
1463 {
1464         if (!equal(a->funcname, b->funcname))
1465                 return false;
1466         if (!equal(a->args, b->args))
1467                 return false;
1468         if (a->agg_star != b->agg_star)
1469                 return false;
1470         if (a->agg_distinct != b->agg_distinct)
1471                 return false;
1472
1473         return true;
1474 }
1475
1476 static bool
1477 _equalAIndices(A_Indices *a, A_Indices *b)
1478 {
1479         if (!equal(a->lidx, b->lidx))
1480                 return false;
1481         if (!equal(a->uidx, b->uidx))
1482                 return false;
1483
1484         return true;
1485 }
1486
1487 static bool
1488 _equalExprFieldSelect(ExprFieldSelect *a, ExprFieldSelect *b)
1489 {
1490         if (!equal(a->arg, b->arg))
1491                 return false;
1492         if (!equal(a->fields, b->fields))
1493                 return false;
1494         if (!equal(a->indirection, b->indirection))
1495                 return false;
1496
1497         return true;
1498 }
1499
1500 static bool
1501 _equalResTarget(ResTarget *a, ResTarget *b)
1502 {
1503         if (!equalstr(a->name, b->name))
1504                 return false;
1505         if (!equal(a->indirection, b->indirection))
1506                 return false;
1507         if (!equal(a->val, b->val))
1508                 return false;
1509
1510         return true;
1511 }
1512
1513 static bool
1514 _equalTypeCast(TypeCast *a, TypeCast *b)
1515 {
1516         if (!equal(a->arg, b->arg))
1517                 return false;
1518         if (!equal(a->typename, b->typename))
1519                 return false;
1520
1521         return true;
1522 }
1523
1524 static bool
1525 _equalSortGroupBy(SortGroupBy *a, SortGroupBy *b)
1526 {
1527         if (!equal(a->useOp, b->useOp))
1528                 return false;
1529         if (!equal(a->node, b->node))
1530                 return false;
1531
1532         return true;
1533 }
1534
1535 static bool
1536 _equalAlias(Alias *a, Alias *b)
1537 {
1538         if (!equalstr(a->aliasname, b->aliasname))
1539                 return false;
1540         if (!equal(a->colnames, b->colnames))
1541                 return false;
1542
1543         return true;
1544 }
1545
1546 static bool
1547 _equalRangeVar(RangeVar *a, RangeVar *b)
1548 {
1549         if (!equalstr(a->catalogname, b->catalogname))
1550                 return false;
1551         if (!equalstr(a->schemaname, b->schemaname))
1552                 return false;
1553         if (!equalstr(a->relname, b->relname))
1554                 return false;
1555         if (a->inhOpt != b->inhOpt)
1556                 return false;
1557         if (a->istemp != b->istemp)
1558                 return false;
1559         if (!equal(a->alias, b->alias))
1560                 return false;
1561
1562         return true;
1563 }
1564
1565 static bool
1566 _equalRangeSubselect(RangeSubselect *a, RangeSubselect *b)
1567 {
1568         if (!equal(a->subquery, b->subquery))
1569                 return false;
1570         if (!equal(a->alias, b->alias))
1571                 return false;
1572
1573         return true;
1574 }
1575
1576 static bool
1577 _equalTypeName(TypeName *a, TypeName *b)
1578 {
1579         if (!equal(a->names, b->names))
1580                 return false;
1581         if (a->typeid != b->typeid)
1582                 return false;
1583         if (a->timezone != b->timezone)
1584                 return false;
1585         if (a->setof != b->setof)
1586                 return false;
1587         if (a->pct_type != b->pct_type)
1588                 return false;
1589         if (a->typmod != b->typmod)
1590                 return false;
1591         if (!equal(a->arrayBounds, b->arrayBounds))
1592                 return false;
1593
1594         return true;
1595 }
1596
1597 static bool
1598 _equalIndexElem(IndexElem *a, IndexElem *b)
1599 {
1600         if (!equalstr(a->name, b->name))
1601                 return false;
1602         if (!equal(a->funcname, b->funcname))
1603                 return false;
1604         if (!equal(a->args, b->args))
1605                 return false;
1606         if (!equal(a->opclass, b->opclass))
1607                 return false;
1608
1609         return true;
1610 }
1611
1612 static bool
1613 _equalColumnDef(ColumnDef *a, ColumnDef *b)
1614 {
1615         if (!equalstr(a->colname, b->colname))
1616                 return false;
1617         if (!equal(a->typename, b->typename))
1618                 return false;
1619         if (a->is_not_null != b->is_not_null)
1620                 return false;
1621         if (!equal(a->raw_default, b->raw_default))
1622                 return false;
1623         if (!equalstr(a->cooked_default, b->cooked_default))
1624                 return false;
1625         if (!equal(a->constraints, b->constraints))
1626                 return false;
1627
1628         return true;
1629 }
1630
1631 static bool
1632 _equalConstraint(Constraint *a, Constraint *b)
1633 {
1634         if (a->contype != b->contype)
1635                 return false;
1636         if (!equalstr(a->name, b->name))
1637                 return false;
1638         if (!equal(a->raw_expr, b->raw_expr))
1639                 return false;
1640         if (!equalstr(a->cooked_expr, b->cooked_expr))
1641                 return false;
1642         if (!equal(a->keys, b->keys))
1643                 return false;
1644
1645         return true;
1646 }
1647
1648 static bool
1649 _equalDefElem(DefElem *a, DefElem *b)
1650 {
1651         if (!equalstr(a->defname, b->defname))
1652                 return false;
1653         if (!equal(a->arg, b->arg))
1654                 return false;
1655
1656         return true;
1657 }
1658
1659 static bool
1660 _equalTargetEntry(TargetEntry *a, TargetEntry *b)
1661 {
1662         if (!equal(a->resdom, b->resdom))
1663                 return false;
1664         if (!equal(a->fjoin, b->fjoin))
1665                 return false;
1666         if (!equal(a->expr, b->expr))
1667                 return false;
1668
1669         return true;
1670 }
1671
1672 static bool
1673 _equalRangeTblEntry(RangeTblEntry *a, RangeTblEntry *b)
1674 {
1675         if (a->rtekind != b->rtekind)
1676                 return false;
1677         if (a->relid != b->relid)
1678                 return false;
1679         if (!equal(a->subquery, b->subquery))
1680                 return false;
1681         if (a->jointype != b->jointype)
1682                 return false;
1683         if (!equali(a->joincoltypes, b->joincoltypes))
1684                 return false;
1685         if (!equali(a->joincoltypmods, b->joincoltypmods))
1686                 return false;
1687         if (!equali(a->joinleftcols, b->joinleftcols))
1688                 return false;
1689         if (!equali(a->joinrightcols, b->joinrightcols))
1690                 return false;
1691         if (!equal(a->alias, b->alias))
1692                 return false;
1693         if (!equal(a->eref, b->eref))
1694                 return false;
1695         if (a->inh != b->inh)
1696                 return false;
1697         if (a->inFromCl != b->inFromCl)
1698                 return false;
1699         if (a->checkForRead != b->checkForRead)
1700                 return false;
1701         if (a->checkForWrite != b->checkForWrite)
1702                 return false;
1703         if (a->checkAsUser != b->checkAsUser)
1704                 return false;
1705
1706         return true;
1707 }
1708
1709 static bool
1710 _equalSortClause(SortClause *a, SortClause *b)
1711 {
1712         if (a->tleSortGroupRef != b->tleSortGroupRef)
1713                 return false;
1714         if (a->sortop != b->sortop)
1715                 return false;
1716
1717         return true;
1718 }
1719
1720 static bool
1721 _equalFkConstraint(FkConstraint *a, FkConstraint *b)
1722 {
1723         if (!equalstr(a->constr_name, b->constr_name))
1724                 return false;
1725         if (!equal(a->pktable, b->pktable))
1726                 return false;
1727         if (!equal(a->fk_attrs, b->fk_attrs))
1728                 return false;
1729         if (!equal(a->pk_attrs, b->pk_attrs))
1730                 return false;
1731         if (!equalstr(a->match_type, b->match_type))
1732                 return false;
1733         if (a->actions != b->actions)
1734                 return false;
1735         if (a->deferrable != b->deferrable)
1736                 return false;
1737         if (a->initdeferred != b->initdeferred)
1738                 return false;
1739
1740         return true;
1741 }
1742
1743 static bool
1744 _equalCaseExpr(CaseExpr *a, CaseExpr *b)
1745 {
1746         if (a->casetype != b->casetype)
1747                 return false;
1748         if (!equal(a->arg, b->arg))
1749                 return false;
1750         if (!equal(a->args, b->args))
1751                 return false;
1752         if (!equal(a->defresult, b->defresult))
1753                 return false;
1754
1755         return true;
1756 }
1757
1758 static bool
1759 _equalCaseWhen(CaseWhen *a, CaseWhen *b)
1760 {
1761         if (!equal(a->expr, b->expr))
1762                 return false;
1763         if (!equal(a->result, b->result))
1764                 return false;
1765
1766         return true;
1767 }
1768
1769 static bool
1770 _equalNullTest(NullTest *a, NullTest *b)
1771 {
1772         if (!equal(a->arg, b->arg))
1773                 return false;
1774         if (a->nulltesttype != b->nulltesttype)
1775                 return false;
1776         return true;
1777 }
1778
1779 static bool
1780 _equalBooleanTest(BooleanTest *a, BooleanTest *b)
1781 {
1782         if (!equal(a->arg, b->arg))
1783                 return false;
1784         if (a->booltesttype != b->booltesttype)
1785                 return false;
1786         return true;
1787 }
1788
1789 /*
1790  * Stuff from pg_list.h
1791  */
1792
1793 static bool
1794 _equalValue(Value *a, Value *b)
1795 {
1796         if (a->type != b->type)
1797                 return false;
1798
1799         switch (a->type)
1800         {
1801                 case T_Integer:
1802                         return a->val.ival == b->val.ival;
1803                 case T_Float:
1804                 case T_String:
1805                 case T_BitString:
1806                         return strcmp(a->val.str, b->val.str) == 0;
1807                 default:
1808                         break;
1809         }
1810
1811         return true;
1812 }
1813
1814 /*
1815  * equal
1816  *        returns whether two nodes are equal
1817  */
1818 bool
1819 equal(void *a, void *b)
1820 {
1821         bool            retval = false;
1822
1823         if (a == b)
1824                 return true;
1825
1826         /*
1827          * note that a!=b, so only one of them can be NULL
1828          */
1829         if (a == NULL || b == NULL)
1830                 return false;
1831
1832         /*
1833          * are they the same type of nodes?
1834          */
1835         if (nodeTag(a) != nodeTag(b))
1836                 return false;
1837
1838         switch (nodeTag(a))
1839         {
1840                 case T_SubPlan:
1841                         retval = _equalSubPlan(a, b);
1842                         break;
1843
1844                 case T_Resdom:
1845                         retval = _equalResdom(a, b);
1846                         break;
1847                 case T_Fjoin:
1848                         retval = _equalFjoin(a, b);
1849                         break;
1850                 case T_Expr:
1851                         retval = _equalExpr(a, b);
1852                         break;
1853                 case T_Var:
1854                         retval = _equalVar(a, b);
1855                         break;
1856                 case T_Oper:
1857                         retval = _equalOper(a, b);
1858                         break;
1859                 case T_Const:
1860                         retval = _equalConst(a, b);
1861                         break;
1862                 case T_Param:
1863                         retval = _equalParam(a, b);
1864                         break;
1865                 case T_Aggref:
1866                         retval = _equalAggref(a, b);
1867                         break;
1868                 case T_SubLink:
1869                         retval = _equalSubLink(a, b);
1870                         break;
1871                 case T_Func:
1872                         retval = _equalFunc(a, b);
1873                         break;
1874                 case T_FieldSelect:
1875                         retval = _equalFieldSelect(a, b);
1876                         break;
1877                 case T_ArrayRef:
1878                         retval = _equalArrayRef(a, b);
1879                         break;
1880                 case T_Iter:
1881                         retval = _equalIter(a, b);
1882                         break;
1883                 case T_RelabelType:
1884                         retval = _equalRelabelType(a, b);
1885                         break;
1886                 case T_RangeTblRef:
1887                         retval = _equalRangeTblRef(a, b);
1888                         break;
1889                 case T_FromExpr:
1890                         retval = _equalFromExpr(a, b);
1891                         break;
1892                 case T_JoinExpr:
1893                         retval = _equalJoinExpr(a, b);
1894                         break;
1895
1896                 case T_RelOptInfo:
1897                         retval = _equalRelOptInfo(a, b);
1898                         break;
1899                 case T_Path:
1900                         retval = _equalPath(a, b);
1901                         break;
1902                 case T_IndexPath:
1903                         retval = _equalIndexPath(a, b);
1904                         break;
1905                 case T_NestPath:
1906                         retval = _equalNestPath(a, b);
1907                         break;
1908                 case T_MergePath:
1909                         retval = _equalMergePath(a, b);
1910                         break;
1911                 case T_HashPath:
1912                         retval = _equalHashPath(a, b);
1913                         break;
1914                 case T_PathKeyItem:
1915                         retval = _equalPathKeyItem(a, b);
1916                         break;
1917                 case T_RestrictInfo:
1918                         retval = _equalRestrictInfo(a, b);
1919                         break;
1920                 case T_JoinInfo:
1921                         retval = _equalJoinInfo(a, b);
1922                         break;
1923                 case T_Stream:
1924                         retval = _equalStream(a, b);
1925                         break;
1926                 case T_TidPath:
1927                         retval = _equalTidPath(a, b);
1928                         break;
1929                 case T_AppendPath:
1930                         retval = _equalAppendPath(a, b);
1931                         break;
1932                 case T_IndexOptInfo:
1933                         retval = _equalIndexOptInfo(a, b);
1934                         break;
1935
1936                 case T_List:
1937                         {
1938                                 List       *la = (List *) a;
1939                                 List       *lb = (List *) b;
1940                                 List       *l;
1941
1942                                 /*
1943                                  * Try to reject by length check before we grovel through
1944                                  * all the elements...
1945                                  */
1946                                 if (length(la) != length(lb))
1947                                         return false;
1948                                 foreach(l, la)
1949                                 {
1950                                         if (!equal(lfirst(l), lfirst(lb)))
1951                                                 return false;
1952                                         lb = lnext(lb);
1953                                 }
1954                                 retval = true;
1955                         }
1956                         break;
1957                 case T_Integer:
1958                 case T_Float:
1959                 case T_String:
1960                 case T_BitString:
1961                         retval = _equalValue(a, b);
1962                         break;
1963
1964                 case T_Query:
1965                         retval = _equalQuery(a, b);
1966                         break;
1967                 case T_InsertStmt:
1968                         retval = _equalInsertStmt(a, b);
1969                         break;
1970                 case T_DeleteStmt:
1971                         retval = _equalDeleteStmt(a, b);
1972                         break;
1973                 case T_UpdateStmt:
1974                         retval = _equalUpdateStmt(a, b);
1975                         break;
1976                 case T_SelectStmt:
1977                         retval = _equalSelectStmt(a, b);
1978                         break;
1979                 case T_SetOperationStmt:
1980                         retval = _equalSetOperationStmt(a, b);
1981                         break;
1982                 case T_AlterTableStmt:
1983                         retval = _equalAlterTableStmt(a, b);
1984                         break;
1985                 case T_GrantStmt:
1986                         retval = _equalGrantStmt(a, b);
1987                         break;
1988                 case T_ClosePortalStmt:
1989                         retval = _equalClosePortalStmt(a, b);
1990                         break;
1991                 case T_ClusterStmt:
1992                         retval = _equalClusterStmt(a, b);
1993                         break;
1994                 case T_CopyStmt:
1995                         retval = _equalCopyStmt(a, b);
1996                         break;
1997                 case T_CreateStmt:
1998                         retval = _equalCreateStmt(a, b);
1999                         break;
2000                 case T_DefineStmt:
2001                         retval = _equalDefineStmt(a, b);
2002                         break;
2003                 case T_DropStmt:
2004                         retval = _equalDropStmt(a, b);
2005                         break;
2006                 case T_TruncateStmt:
2007                         retval = _equalTruncateStmt(a, b);
2008                         break;
2009                 case T_CommentStmt:
2010                         retval = _equalCommentStmt(a, b);
2011                         break;
2012                 case T_FetchStmt:
2013                         retval = _equalFetchStmt(a, b);
2014                         break;
2015                 case T_IndexStmt:
2016                         retval = _equalIndexStmt(a, b);
2017                         break;
2018                 case T_ProcedureStmt:
2019                         retval = _equalProcedureStmt(a, b);
2020                         break;
2021                 case T_RemoveAggrStmt:
2022                         retval = _equalRemoveAggrStmt(a, b);
2023                         break;
2024                 case T_RemoveFuncStmt:
2025                         retval = _equalRemoveFuncStmt(a, b);
2026                         break;
2027                 case T_RemoveOperStmt:
2028                         retval = _equalRemoveOperStmt(a, b);
2029                         break;
2030                 case T_RenameStmt:
2031                         retval = _equalRenameStmt(a, b);
2032                         break;
2033                 case T_RuleStmt:
2034                         retval = _equalRuleStmt(a, b);
2035                         break;
2036                 case T_NotifyStmt:
2037                         retval = _equalNotifyStmt(a, b);
2038                         break;
2039                 case T_ListenStmt:
2040                         retval = _equalListenStmt(a, b);
2041                         break;
2042                 case T_UnlistenStmt:
2043                         retval = _equalUnlistenStmt(a, b);
2044                         break;
2045                 case T_TransactionStmt:
2046                         retval = _equalTransactionStmt(a, b);
2047                         break;
2048                 case T_ViewStmt:
2049                         retval = _equalViewStmt(a, b);
2050                         break;
2051                 case T_LoadStmt:
2052                         retval = _equalLoadStmt(a, b);
2053                         break;
2054                 case T_CreateDomainStmt:
2055                         retval = _equalCreateDomainStmt(a, b);
2056                         break;
2057                 case T_CreatedbStmt:
2058                         retval = _equalCreatedbStmt(a, b);
2059                         break;
2060                 case T_AlterDatabaseSetStmt:
2061                         retval = _equalAlterDatabaseSetStmt(a, b);
2062                         break;
2063                 case T_DropdbStmt:
2064                         retval = _equalDropdbStmt(a, b);
2065                         break;
2066                 case T_VacuumStmt:
2067                         retval = _equalVacuumStmt(a, b);
2068                         break;
2069                 case T_ExplainStmt:
2070                         retval = _equalExplainStmt(a, b);
2071                         break;
2072                 case T_CreateSeqStmt:
2073                         retval = _equalCreateSeqStmt(a, b);
2074                         break;
2075                 case T_VariableSetStmt:
2076                         retval = _equalVariableSetStmt(a, b);
2077                         break;
2078                 case T_VariableShowStmt:
2079                         retval = _equalVariableShowStmt(a, b);
2080                         break;
2081                 case T_VariableResetStmt:
2082                         retval = _equalVariableResetStmt(a, b);
2083                         break;
2084                 case T_CreateTrigStmt:
2085                         retval = _equalCreateTrigStmt(a, b);
2086                         break;
2087                 case T_DropPropertyStmt:
2088                         retval = _equalDropPropertyStmt(a, b);
2089                         break;
2090                 case T_CreatePLangStmt:
2091                         retval = _equalCreatePLangStmt(a, b);
2092                         break;
2093                 case T_DropPLangStmt:
2094                         retval = _equalDropPLangStmt(a, b);
2095                         break;
2096                 case T_CreateUserStmt:
2097                         retval = _equalCreateUserStmt(a, b);
2098                         break;
2099                 case T_AlterUserStmt:
2100                         retval = _equalAlterUserStmt(a, b);
2101                         break;
2102                 case T_AlterUserSetStmt:
2103                         retval = _equalAlterUserSetStmt(a, b);
2104                         break;
2105                 case T_DropUserStmt:
2106                         retval = _equalDropUserStmt(a, b);
2107                         break;
2108                 case T_LockStmt:
2109                         retval = _equalLockStmt(a, b);
2110                         break;
2111                 case T_ConstraintsSetStmt:
2112                         retval = _equalConstraintsSetStmt(a, b);
2113                         break;
2114                 case T_CreateGroupStmt:
2115                         retval = _equalCreateGroupStmt(a, b);
2116                         break;
2117                 case T_AlterGroupStmt:
2118                         retval = _equalAlterGroupStmt(a, b);
2119                         break;
2120                 case T_DropGroupStmt:
2121                         retval = _equalDropGroupStmt(a, b);
2122                         break;
2123                 case T_ReindexStmt:
2124                         retval = _equalReindexStmt(a, b);
2125                         break;
2126                 case T_CheckPointStmt:
2127                         retval = true;
2128                         break;
2129                 case T_CreateSchemaStmt:
2130                         retval = _equalCreateSchemaStmt(a, b);
2131                         break;
2132
2133                 case T_A_Expr:
2134                         retval = _equalAExpr(a, b);
2135                         break;
2136                 case T_ColumnRef:
2137                         retval = _equalColumnRef(a, b);
2138                         break;
2139                 case T_ParamRef:
2140                         retval = _equalParamRef(a, b);
2141                         break;
2142                 case T_A_Const:
2143                         retval = _equalAConst(a, b);
2144                         break;
2145                 case T_Ident:
2146                         retval = _equalIdent(a, b);
2147                         break;
2148                 case T_FuncCall:
2149                         retval = _equalFuncCall(a, b);
2150                         break;
2151                 case T_A_Indices:
2152                         retval = _equalAIndices(a, b);
2153                         break;
2154                 case T_ExprFieldSelect:
2155                         retval = _equalExprFieldSelect(a, b);
2156                         break;
2157                 case T_ResTarget:
2158                         retval = _equalResTarget(a, b);
2159                         break;
2160                 case T_TypeCast:
2161                         retval = _equalTypeCast(a, b);
2162                         break;
2163                 case T_SortGroupBy:
2164                         retval = _equalSortGroupBy(a, b);
2165                         break;
2166                 case T_Alias:
2167                         retval = _equalAlias(a, b);
2168                         break;
2169                 case T_RangeVar:
2170                         retval = _equalRangeVar(a, b);
2171                         break;
2172                 case T_RangeSubselect:
2173                         retval = _equalRangeSubselect(a, b);
2174                         break;
2175                 case T_TypeName:
2176                         retval = _equalTypeName(a, b);
2177                         break;
2178                 case T_IndexElem:
2179                         retval = _equalIndexElem(a, b);
2180                         break;
2181                 case T_ColumnDef:
2182                         retval = _equalColumnDef(a, b);
2183                         break;
2184                 case T_Constraint:
2185                         retval = _equalConstraint(a, b);
2186                         break;
2187                 case T_DefElem:
2188                         retval = _equalDefElem(a, b);
2189                         break;
2190                 case T_TargetEntry:
2191                         retval = _equalTargetEntry(a, b);
2192                         break;
2193                 case T_RangeTblEntry:
2194                         retval = _equalRangeTblEntry(a, b);
2195                         break;
2196                 case T_SortClause:
2197                         retval = _equalSortClause(a, b);
2198                         break;
2199                 case T_GroupClause:
2200                         /* GroupClause is equivalent to SortClause */
2201                         retval = _equalSortClause(a, b);
2202                         break;
2203                 case T_CaseExpr:
2204                         retval = _equalCaseExpr(a, b);
2205                         break;
2206                 case T_CaseWhen:
2207                         retval = _equalCaseWhen(a, b);
2208                         break;
2209                 case T_NullTest:
2210                         retval = _equalNullTest(a, b);
2211                         break;
2212                 case T_BooleanTest:
2213                         retval = _equalBooleanTest(a, b);
2214                         break;
2215                 case T_FkConstraint:
2216                         retval = _equalFkConstraint(a, b);
2217                         break;
2218                 case T_PrivGrantee:
2219                         retval = _equalPrivGrantee(a, b);
2220                         break;
2221                 case T_FuncWithArgs:
2222                         retval = _equalFuncWithArgs(a, b);
2223                         break;
2224                 case T_InsertDefault:
2225                         retval = _equalInsertDefault(a, b);
2226                         break;
2227
2228                 default:
2229                         elog(WARNING, "equal: don't know whether nodes of type %d are equal",
2230                                  nodeTag(a));
2231                         break;
2232         }
2233
2234         return retval;
2235 }