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parse_clause.c
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1/*-------------------------------------------------------------------------
2 *
3 * parse_clause.c
4 * handle clauses in parser
5 *
6 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 *
10 * IDENTIFICATION
11 * src/backend/parser/parse_clause.c
12 *
13 *-------------------------------------------------------------------------
14 */
15
16#include "postgres.h"
17
18#include "access/htup_details.h"
19#include "access/nbtree.h"
20#include "access/table.h"
21#include "access/tsmapi.h"
22#include "catalog/catalog.h"
23#include "catalog/pg_am.h"
24#include "catalog/pg_amproc.h"
26#include "catalog/pg_type.h"
27#include "commands/defrem.h"
28#include "miscadmin.h"
29#include "nodes/makefuncs.h"
30#include "nodes/nodeFuncs.h"
31#include "optimizer/optimizer.h"
32#include "parser/analyze.h"
33#include "parser/parse_clause.h"
34#include "parser/parse_coerce.h"
36#include "parser/parse_expr.h"
37#include "parser/parse_func.h"
38#include "parser/parse_oper.h"
40#include "parser/parse_target.h"
41#include "parser/parse_type.h"
42#include "parser/parser.h"
44#include "utils/builtins.h"
45#include "utils/catcache.h"
46#include "utils/lsyscache.h"
47#include "utils/rel.h"
48#include "utils/syscache.h"
49
50
51static int extractRemainingColumns(ParseState *pstate,
52 ParseNamespaceColumn *src_nscolumns,
53 List *src_colnames,
54 List **src_colnos,
55 List **res_colnames, List **res_colvars,
56 ParseNamespaceColumn *res_nscolumns);
58 List *leftVars, List *rightVars);
60 List *namespace);
65 RangeFunction *r);
67 RangeTableFunc *rtf);
69 RangeTableSample *rts);
71 RangeVar *rv);
73 ParseNamespaceItem **top_nsitem,
74 List **namespace);
75static Var *buildVarFromNSColumn(ParseState *pstate,
77static Node *buildMergedJoinVar(ParseState *pstate, JoinType jointype,
78 Var *l_colvar, Var *r_colvar);
79static void markRelsAsNulledBy(ParseState *pstate, Node *n, int jindex);
80static void setNamespaceColumnVisibility(List *namespace, bool cols_visible);
81static void setNamespaceLateralState(List *namespace,
82 bool lateral_only, bool lateral_ok);
83static void checkExprIsVarFree(ParseState *pstate, Node *n,
84 const char *constructName);
86 List **tlist, ParseExprKind exprKind);
88 List **tlist, ParseExprKind exprKind);
89static int get_matching_location(int sortgroupref,
90 List *sortgrouprefs, List *exprs);
92 Relation heapRel);
94 List *grouplist, List *targetlist, int location);
95static WindowClause *findWindowClause(List *wclist, const char *name);
96static Node *transformFrameOffset(ParseState *pstate, int frameOptions,
97 Oid rangeopfamily, Oid rangeopcintype, Oid *inRangeFunc,
98 Node *clause);
99
100
101/*
102 * transformFromClause -
103 * Process the FROM clause and add items to the query's range table,
104 * joinlist, and namespace.
105 *
106 * Note: we assume that the pstate's p_rtable, p_joinlist, and p_namespace
107 * lists were initialized to NIL when the pstate was created.
108 * We will add onto any entries already present --- this is needed for rule
109 * processing, as well as for UPDATE and DELETE.
110 */
111void
113{
114 ListCell *fl;
115
116 /*
117 * The grammar will have produced a list of RangeVars, RangeSubselects,
118 * RangeFunctions, and/or JoinExprs. Transform each one (possibly adding
119 * entries to the rtable), check for duplicate refnames, and then add it
120 * to the joinlist and namespace.
121 *
122 * Note we must process the items left-to-right for proper handling of
123 * LATERAL references.
124 */
125 foreach(fl, frmList)
126 {
127 Node *n = lfirst(fl);
128 ParseNamespaceItem *nsitem;
129 List *namespace;
130
131 n = transformFromClauseItem(pstate, n,
132 &nsitem,
133 &namespace);
134
135 checkNameSpaceConflicts(pstate, pstate->p_namespace, namespace);
136
137 /* Mark the new namespace items as visible only to LATERAL */
138 setNamespaceLateralState(namespace, true, true);
139
140 pstate->p_joinlist = lappend(pstate->p_joinlist, n);
141 pstate->p_namespace = list_concat(pstate->p_namespace, namespace);
142 }
143
144 /*
145 * We're done parsing the FROM list, so make all namespace items
146 * unconditionally visible. Note that this will also reset lateral_only
147 * for any namespace items that were already present when we were called;
148 * but those should have been that way already.
149 */
150 setNamespaceLateralState(pstate->p_namespace, false, true);
151}
152
153/*
154 * setTargetTable
155 * Add the target relation of INSERT/UPDATE/DELETE/MERGE to the range table,
156 * and make the special links to it in the ParseState.
157 *
158 * We also open the target relation and acquire a write lock on it.
159 * This must be done before processing the FROM list, in case the target
160 * is also mentioned as a source relation --- we want to be sure to grab
161 * the write lock before any read lock.
162 *
163 * If alsoSource is true, add the target to the query's joinlist and
164 * namespace. For INSERT, we don't want the target to be joined to;
165 * it's a destination of tuples, not a source. MERGE is actually
166 * both, but we'll add it separately to joinlist and namespace, so
167 * doing nothing (like INSERT) is correct here. For UPDATE/DELETE,
168 * we do need to scan or join the target. (NOTE: we do not bother
169 * to check for namespace conflict; we assume that the namespace was
170 * initially empty in these cases.)
171 *
172 * Finally, we mark the relation as requiring the permissions specified
173 * by requiredPerms.
174 *
175 * Returns the rangetable index of the target relation.
176 */
177int
179 bool inh, bool alsoSource, AclMode requiredPerms)
180{
181 ParseNamespaceItem *nsitem;
182
183 /*
184 * ENRs hide tables of the same name, so we need to check for them first.
185 * In contrast, CTEs don't hide tables (for this purpose).
186 */
187 if (relation->schemaname == NULL &&
188 scanNameSpaceForENR(pstate, relation->relname))
190 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
191 errmsg("relation \"%s\" cannot be the target of a modifying statement",
192 relation->relname)));
193
194 /* Close old target; this could only happen for multi-action rules */
195 if (pstate->p_target_relation != NULL)
197
198 /*
199 * Open target rel and grab suitable lock (which we will hold till end of
200 * transaction).
201 *
202 * free_parsestate() will eventually do the corresponding table_close(),
203 * but *not* release the lock.
204 */
205 pstate->p_target_relation = parserOpenTable(pstate, relation,
207
208 /*
209 * Now build an RTE and a ParseNamespaceItem.
210 */
211 nsitem = addRangeTableEntryForRelation(pstate, pstate->p_target_relation,
213 relation->alias, inh, false);
214
215 /* remember the RTE/nsitem as being the query target */
216 pstate->p_target_nsitem = nsitem;
217
218 /*
219 * Override addRangeTableEntry's default ACL_SELECT permissions check, and
220 * instead mark target table as requiring exactly the specified
221 * permissions.
222 *
223 * If we find an explicit reference to the rel later during parse
224 * analysis, we will add the ACL_SELECT bit back again; see
225 * markVarForSelectPriv and its callers.
226 */
227 nsitem->p_perminfo->requiredPerms = requiredPerms;
228
229 /*
230 * If UPDATE/DELETE, add table to joinlist and namespace.
231 */
232 if (alsoSource)
233 addNSItemToQuery(pstate, nsitem, true, true, true);
234
235 return nsitem->p_rtindex;
236}
237
238/*
239 * Extract all not-in-common columns from column lists of a source table
240 *
241 * src_nscolumns and src_colnames describe the source table.
242 *
243 * *src_colnos initially contains the column numbers of the already-merged
244 * columns. We add to it the column number of each additional column.
245 * Also append to *res_colnames the name of each additional column,
246 * append to *res_colvars a Var for each additional column, and copy the
247 * columns' nscolumns data into res_nscolumns[] (which is caller-allocated
248 * space that had better be big enough).
249 *
250 * Returns the number of columns added.
251 */
252static int
254 ParseNamespaceColumn *src_nscolumns,
255 List *src_colnames,
256 List **src_colnos,
257 List **res_colnames, List **res_colvars,
258 ParseNamespaceColumn *res_nscolumns)
259{
260 int colcount = 0;
261 Bitmapset *prevcols;
262 int attnum;
263 ListCell *lc;
264
265 /*
266 * While we could just test "list_member_int(*src_colnos, attnum)" to
267 * detect already-merged columns in the loop below, that would be O(N^2)
268 * for a wide input table. Instead build a bitmapset of just the merged
269 * USING columns, which we won't add to within the main loop.
270 */
271 prevcols = NULL;
272 foreach(lc, *src_colnos)
273 {
274 prevcols = bms_add_member(prevcols, lfirst_int(lc));
275 }
276
277 attnum = 0;
278 foreach(lc, src_colnames)
279 {
280 char *colname = strVal(lfirst(lc));
281
282 attnum++;
283 /* Non-dropped and not already merged? */
284 if (colname[0] != '\0' && !bms_is_member(attnum, prevcols))
285 {
286 /* Yes, so emit it as next output column */
287 *src_colnos = lappend_int(*src_colnos, attnum);
288 *res_colnames = lappend(*res_colnames, lfirst(lc));
289 *res_colvars = lappend(*res_colvars,
291 src_nscolumns + attnum - 1));
292 /* Copy the input relation's nscolumn data for this column */
293 res_nscolumns[colcount] = src_nscolumns[attnum - 1];
294 colcount++;
295 }
296 }
297 return colcount;
298}
299
300/* transformJoinUsingClause()
301 * Build a complete ON clause from a partially-transformed USING list.
302 * We are given lists of nodes representing left and right match columns.
303 * Result is a transformed qualification expression.
304 */
305static Node *
307 List *leftVars, List *rightVars)
308{
309 Node *result;
310 List *andargs = NIL;
311 ListCell *lvars,
312 *rvars;
313
314 /*
315 * We cheat a little bit here by building an untransformed operator tree
316 * whose leaves are the already-transformed Vars. This requires collusion
317 * from transformExpr(), which normally could be expected to complain
318 * about already-transformed subnodes. However, this does mean that we
319 * have to mark the columns as requiring SELECT privilege for ourselves;
320 * transformExpr() won't do it.
321 */
322 forboth(lvars, leftVars, rvars, rightVars)
323 {
324 Var *lvar = (Var *) lfirst(lvars);
325 Var *rvar = (Var *) lfirst(rvars);
326 A_Expr *e;
327
328 /* Require read access to the join variables */
329 markVarForSelectPriv(pstate, lvar);
330 markVarForSelectPriv(pstate, rvar);
331
332 /* Now create the lvar = rvar join condition */
334 (Node *) copyObject(lvar), (Node *) copyObject(rvar),
335 -1);
336
337 /* Prepare to combine into an AND clause, if multiple join columns */
338 andargs = lappend(andargs, e);
339 }
340
341 /* Only need an AND if there's more than one join column */
342 if (list_length(andargs) == 1)
343 result = (Node *) linitial(andargs);
344 else
345 result = (Node *) makeBoolExpr(AND_EXPR, andargs, -1);
346
347 /*
348 * Since the references are already Vars, and are certainly from the input
349 * relations, we don't have to go through the same pushups that
350 * transformJoinOnClause() does. Just invoke transformExpr() to fix up
351 * the operators, and we're done.
352 */
353 result = transformExpr(pstate, result, EXPR_KIND_JOIN_USING);
354
355 result = coerce_to_boolean(pstate, result, "JOIN/USING");
356
357 return result;
358}
359
360/* transformJoinOnClause()
361 * Transform the qual conditions for JOIN/ON.
362 * Result is a transformed qualification expression.
363 */
364static Node *
366{
367 Node *result;
368 List *save_namespace;
369
370 /*
371 * The namespace that the join expression should see is just the two
372 * subtrees of the JOIN plus any outer references from upper pstate
373 * levels. Temporarily set this pstate's namespace accordingly. (We need
374 * not check for refname conflicts, because transformFromClauseItem()
375 * already did.) All namespace items are marked visible regardless of
376 * LATERAL state.
377 */
378 setNamespaceLateralState(namespace, false, true);
379
380 save_namespace = pstate->p_namespace;
381 pstate->p_namespace = namespace;
382
383 result = transformWhereClause(pstate, j->quals,
384 EXPR_KIND_JOIN_ON, "JOIN/ON");
385
386 pstate->p_namespace = save_namespace;
387
388 return result;
389}
390
391/*
392 * transformTableEntry --- transform a RangeVar (simple relation reference)
393 */
394static ParseNamespaceItem *
396{
397 /* addRangeTableEntry does all the work */
398 return addRangeTableEntry(pstate, r, r->alias, r->inh, true);
399}
400
401/*
402 * transformRangeSubselect --- transform a sub-SELECT appearing in FROM
403 */
404static ParseNamespaceItem *
406{
407 Query *query;
408
409 /*
410 * Set p_expr_kind to show this parse level is recursing to a subselect.
411 * We can't be nested within any expression, so don't need save-restore
412 * logic here.
413 */
416
417 /*
418 * If the subselect is LATERAL, make lateral_only names of this level
419 * visible to it. (LATERAL can't nest within a single pstate level, so we
420 * don't need save/restore logic here.)
421 */
422 Assert(!pstate->p_lateral_active);
423 pstate->p_lateral_active = r->lateral;
424
425 /*
426 * Analyze and transform the subquery. Note that if the subquery doesn't
427 * have an alias, it can't be explicitly selected for locking, but locking
428 * might still be required (if there is an all-tables locking clause).
429 */
430 query = parse_sub_analyze(r->subquery, pstate, NULL,
431 isLockedRefname(pstate,
432 r->alias == NULL ? NULL :
433 r->alias->aliasname),
434 true);
435
436 /* Restore state */
437 pstate->p_lateral_active = false;
438 pstate->p_expr_kind = EXPR_KIND_NONE;
439
440 /*
441 * Check that we got a SELECT. Anything else should be impossible given
442 * restrictions of the grammar, but check anyway.
443 */
444 if (!IsA(query, Query) ||
445 query->commandType != CMD_SELECT)
446 elog(ERROR, "unexpected non-SELECT command in subquery in FROM");
447
448 /*
449 * OK, build an RTE and nsitem for the subquery.
450 */
451 return addRangeTableEntryForSubquery(pstate,
452 query,
453 r->alias,
454 r->lateral,
455 true);
456}
457
458
459/*
460 * transformRangeFunction --- transform a function call appearing in FROM
461 */
462static ParseNamespaceItem *
464{
465 List *funcexprs = NIL;
466 List *funcnames = NIL;
467 List *coldeflists = NIL;
468 bool is_lateral;
469 ListCell *lc;
470
471 /*
472 * We make lateral_only names of this level visible, whether or not the
473 * RangeFunction is explicitly marked LATERAL. This is needed for SQL
474 * spec compliance in the case of UNNEST(), and seems useful on
475 * convenience grounds for all functions in FROM.
476 *
477 * (LATERAL can't nest within a single pstate level, so we don't need
478 * save/restore logic here.)
479 */
480 Assert(!pstate->p_lateral_active);
481 pstate->p_lateral_active = true;
482
483 /*
484 * Transform the raw expressions.
485 *
486 * While transforming, also save function names for possible use as alias
487 * and column names. We use the same transformation rules as for a SELECT
488 * output expression. For a FuncCall node, the result will be the
489 * function name, but it is possible for the grammar to hand back other
490 * node types.
491 *
492 * We have to get this info now, because FigureColname only works on raw
493 * parsetrees. Actually deciding what to do with the names is left up to
494 * addRangeTableEntryForFunction.
495 *
496 * Likewise, collect column definition lists if there were any. But
497 * complain if we find one here and the RangeFunction has one too.
498 */
499 foreach(lc, r->functions)
500 {
501 List *pair = (List *) lfirst(lc);
502 Node *fexpr;
503 List *coldeflist;
504 Node *newfexpr;
505 Node *last_srf;
506
507 /* Disassemble the function-call/column-def-list pairs */
508 Assert(list_length(pair) == 2);
509 fexpr = (Node *) linitial(pair);
510 coldeflist = (List *) lsecond(pair);
511
512 /*
513 * If we find a function call unnest() with more than one argument and
514 * no special decoration, transform it into separate unnest() calls on
515 * each argument. This is a kluge, for sure, but it's less nasty than
516 * other ways of implementing the SQL-standard UNNEST() syntax.
517 *
518 * If there is any decoration (including a coldeflist), we don't
519 * transform, which probably means a no-such-function error later. We
520 * could alternatively throw an error right now, but that doesn't seem
521 * tremendously helpful. If someone is using any such decoration,
522 * then they're not using the SQL-standard syntax, and they're more
523 * likely expecting an un-tweaked function call.
524 *
525 * Note: the transformation changes a non-schema-qualified unnest()
526 * function name into schema-qualified pg_catalog.unnest(). This
527 * choice is also a bit debatable, but it seems reasonable to force
528 * use of built-in unnest() when we make this transformation.
529 */
530 if (IsA(fexpr, FuncCall))
531 {
532 FuncCall *fc = (FuncCall *) fexpr;
533
534 if (list_length(fc->funcname) == 1 &&
535 strcmp(strVal(linitial(fc->funcname)), "unnest") == 0 &&
536 list_length(fc->args) > 1 &&
537 fc->agg_order == NIL &&
538 fc->agg_filter == NULL &&
539 fc->over == NULL &&
540 !fc->agg_star &&
541 !fc->agg_distinct &&
542 !fc->func_variadic &&
543 coldeflist == NIL)
544 {
545 ListCell *lc2;
546
547 foreach(lc2, fc->args)
548 {
549 Node *arg = (Node *) lfirst(lc2);
550 FuncCall *newfc;
551
552 last_srf = pstate->p_last_srf;
553
554 newfc = makeFuncCall(SystemFuncName("unnest"),
557 fc->location);
558
559 newfexpr = transformExpr(pstate, (Node *) newfc,
561
562 /* nodeFunctionscan.c requires SRFs to be at top level */
563 if (pstate->p_last_srf != last_srf &&
564 pstate->p_last_srf != newfexpr)
566 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
567 errmsg("set-returning functions must appear at top level of FROM"),
568 parser_errposition(pstate,
569 exprLocation(pstate->p_last_srf))));
570
571 funcexprs = lappend(funcexprs, newfexpr);
572
573 funcnames = lappend(funcnames,
574 FigureColname((Node *) newfc));
575
576 /* coldeflist is empty, so no error is possible */
577
578 coldeflists = lappend(coldeflists, coldeflist);
579 }
580 continue; /* done with this function item */
581 }
582 }
583
584 /* normal case ... */
585 last_srf = pstate->p_last_srf;
586
587 newfexpr = transformExpr(pstate, fexpr,
589
590 /* nodeFunctionscan.c requires SRFs to be at top level */
591 if (pstate->p_last_srf != last_srf &&
592 pstate->p_last_srf != newfexpr)
594 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
595 errmsg("set-returning functions must appear at top level of FROM"),
596 parser_errposition(pstate,
597 exprLocation(pstate->p_last_srf))));
598
599 funcexprs = lappend(funcexprs, newfexpr);
600
601 funcnames = lappend(funcnames,
602 FigureColname(fexpr));
603
604 if (coldeflist && r->coldeflist)
606 (errcode(ERRCODE_SYNTAX_ERROR),
607 errmsg("multiple column definition lists are not allowed for the same function"),
608 parser_errposition(pstate,
609 exprLocation((Node *) r->coldeflist))));
610
611 coldeflists = lappend(coldeflists, coldeflist);
612 }
613
614 pstate->p_lateral_active = false;
615
616 /*
617 * We must assign collations now so that the RTE exposes correct collation
618 * info for Vars created from it.
619 */
620 assign_list_collations(pstate, funcexprs);
621
622 /*
623 * Install the top-level coldeflist if there was one (we already checked
624 * that there was no conflicting per-function coldeflist).
625 *
626 * We only allow this when there's a single function (even after UNNEST
627 * expansion) and no WITH ORDINALITY. The reason for the latter
628 * restriction is that it's not real clear whether the ordinality column
629 * should be in the coldeflist, and users are too likely to make mistakes
630 * in one direction or the other. Putting the coldeflist inside ROWS
631 * FROM() is much clearer in this case.
632 */
633 if (r->coldeflist)
634 {
635 if (list_length(funcexprs) != 1)
636 {
637 if (r->is_rowsfrom)
639 (errcode(ERRCODE_SYNTAX_ERROR),
640 errmsg("ROWS FROM() with multiple functions cannot have a column definition list"),
641 errhint("Put a separate column definition list for each function inside ROWS FROM()."),
642 parser_errposition(pstate,
643 exprLocation((Node *) r->coldeflist))));
644 else
646 (errcode(ERRCODE_SYNTAX_ERROR),
647 errmsg("UNNEST() with multiple arguments cannot have a column definition list"),
648 errhint("Use separate UNNEST() calls inside ROWS FROM(), and attach a column definition list to each one."),
649 parser_errposition(pstate,
650 exprLocation((Node *) r->coldeflist))));
651 }
652 if (r->ordinality)
654 (errcode(ERRCODE_SYNTAX_ERROR),
655 errmsg("WITH ORDINALITY cannot be used with a column definition list"),
656 errhint("Put the column definition list inside ROWS FROM()."),
657 parser_errposition(pstate,
658 exprLocation((Node *) r->coldeflist))));
659
660 coldeflists = list_make1(r->coldeflist);
661 }
662
663 /*
664 * Mark the RTE as LATERAL if the user said LATERAL explicitly, or if
665 * there are any lateral cross-references in it.
666 */
667 is_lateral = r->lateral || contain_vars_of_level((Node *) funcexprs, 0);
668
669 /*
670 * OK, build an RTE and nsitem for the function.
671 */
672 return addRangeTableEntryForFunction(pstate,
673 funcnames, funcexprs, coldeflists,
674 r, is_lateral, true);
675}
676
677/*
678 * transformRangeTableFunc -
679 * Transform a raw RangeTableFunc into TableFunc.
680 *
681 * Transform the namespace clauses, the document-generating expression, the
682 * row-generating expression, the column-generating expressions, and the
683 * default value expressions.
684 */
685static ParseNamespaceItem *
687{
689 const char *constructName;
690 Oid docType;
691 bool is_lateral;
692 ListCell *col;
693 char **names;
694 int colno;
695
696 /*
697 * Currently we only support XMLTABLE here. See transformJsonTable() for
698 * JSON_TABLE support.
699 */
701 constructName = "XMLTABLE";
702 docType = XMLOID;
703
704 /*
705 * We make lateral_only names of this level visible, whether or not the
706 * RangeTableFunc is explicitly marked LATERAL. This is needed for SQL
707 * spec compliance and seems useful on convenience grounds for all
708 * functions in FROM.
709 *
710 * (LATERAL can't nest within a single pstate level, so we don't need
711 * save/restore logic here.)
712 */
713 Assert(!pstate->p_lateral_active);
714 pstate->p_lateral_active = true;
715
716 /* Transform and apply typecast to the row-generating expression ... */
717 Assert(rtf->rowexpr != NULL);
718 tf->rowexpr = coerce_to_specific_type(pstate,
720 TEXTOID,
721 constructName);
722 assign_expr_collations(pstate, tf->rowexpr);
723
724 /* ... and to the document itself */
725 Assert(rtf->docexpr != NULL);
726 tf->docexpr = coerce_to_specific_type(pstate,
728 docType,
729 constructName);
730 assign_expr_collations(pstate, tf->docexpr);
731
732 /* undef ordinality column number */
733 tf->ordinalitycol = -1;
734
735 /* Process column specs */
736 names = palloc(sizeof(char *) * list_length(rtf->columns));
737
738 colno = 0;
739 foreach(col, rtf->columns)
740 {
742 Oid typid;
743 int32 typmod;
744 Node *colexpr;
745 Node *coldefexpr;
746 int j;
747
748 tf->colnames = lappend(tf->colnames,
749 makeString(pstrdup(rawc->colname)));
750
751 /*
752 * Determine the type and typmod for the new column. FOR ORDINALITY
753 * columns are INTEGER per spec; the others are user-specified.
754 */
755 if (rawc->for_ordinality)
756 {
757 if (tf->ordinalitycol != -1)
759 (errcode(ERRCODE_SYNTAX_ERROR),
760 errmsg("only one FOR ORDINALITY column is allowed"),
761 parser_errposition(pstate, rawc->location)));
762
763 typid = INT4OID;
764 typmod = -1;
765 tf->ordinalitycol = colno;
766 }
767 else
768 {
769 if (rawc->typeName->setof)
771 (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
772 errmsg("column \"%s\" cannot be declared SETOF",
773 rawc->colname),
774 parser_errposition(pstate, rawc->location)));
775
776 typenameTypeIdAndMod(pstate, rawc->typeName,
777 &typid, &typmod);
778 }
779
780 tf->coltypes = lappend_oid(tf->coltypes, typid);
781 tf->coltypmods = lappend_int(tf->coltypmods, typmod);
782 tf->colcollations = lappend_oid(tf->colcollations,
783 get_typcollation(typid));
784
785 /* Transform the PATH and DEFAULT expressions */
786 if (rawc->colexpr)
787 {
788 colexpr = coerce_to_specific_type(pstate,
789 transformExpr(pstate, rawc->colexpr,
791 TEXTOID,
792 constructName);
793 assign_expr_collations(pstate, colexpr);
794 }
795 else
796 colexpr = NULL;
797
798 if (rawc->coldefexpr)
799 {
800 coldefexpr = coerce_to_specific_type_typmod(pstate,
801 transformExpr(pstate, rawc->coldefexpr,
803 typid, typmod,
804 constructName);
805 assign_expr_collations(pstate, coldefexpr);
806 }
807 else
808 coldefexpr = NULL;
809
810 tf->colexprs = lappend(tf->colexprs, colexpr);
811 tf->coldefexprs = lappend(tf->coldefexprs, coldefexpr);
812
813 if (rawc->is_not_null)
814 tf->notnulls = bms_add_member(tf->notnulls, colno);
815
816 /* make sure column names are unique */
817 for (j = 0; j < colno; j++)
818 if (strcmp(names[j], rawc->colname) == 0)
820 (errcode(ERRCODE_SYNTAX_ERROR),
821 errmsg("column name \"%s\" is not unique",
822 rawc->colname),
823 parser_errposition(pstate, rawc->location)));
824 names[colno] = rawc->colname;
825
826 colno++;
827 }
828 pfree(names);
829
830 /* Namespaces, if any, also need to be transformed */
831 if (rtf->namespaces != NIL)
832 {
833 ListCell *ns;
834 ListCell *lc2;
835 List *ns_uris = NIL;
836 List *ns_names = NIL;
837 bool default_ns_seen = false;
838
839 foreach(ns, rtf->namespaces)
840 {
841 ResTarget *r = (ResTarget *) lfirst(ns);
842 Node *ns_uri;
843
844 Assert(IsA(r, ResTarget));
845 ns_uri = transformExpr(pstate, r->val, EXPR_KIND_FROM_FUNCTION);
846 ns_uri = coerce_to_specific_type(pstate, ns_uri,
847 TEXTOID, constructName);
848 assign_expr_collations(pstate, ns_uri);
849 ns_uris = lappend(ns_uris, ns_uri);
850
851 /* Verify consistency of name list: no dupes, only one DEFAULT */
852 if (r->name != NULL)
853 {
854 foreach(lc2, ns_names)
855 {
856 String *ns_node = lfirst_node(String, lc2);
857
858 if (ns_node == NULL)
859 continue;
860 if (strcmp(strVal(ns_node), r->name) == 0)
862 (errcode(ERRCODE_SYNTAX_ERROR),
863 errmsg("namespace name \"%s\" is not unique",
864 r->name),
865 parser_errposition(pstate, r->location)));
866 }
867 }
868 else
869 {
870 if (default_ns_seen)
872 (errcode(ERRCODE_SYNTAX_ERROR),
873 errmsg("only one default namespace is allowed"),
874 parser_errposition(pstate, r->location)));
875 default_ns_seen = true;
876 }
877
878 /* We represent DEFAULT by a null pointer */
879 ns_names = lappend(ns_names,
880 r->name ? makeString(r->name) : NULL);
881 }
882
883 tf->ns_uris = ns_uris;
884 tf->ns_names = ns_names;
885 }
886
887 tf->location = rtf->location;
888
889 pstate->p_lateral_active = false;
890
891 /*
892 * Mark the RTE as LATERAL if the user said LATERAL explicitly, or if
893 * there are any lateral cross-references in it.
894 */
895 is_lateral = rtf->lateral || contain_vars_of_level((Node *) tf, 0);
896
897 return addRangeTableEntryForTableFunc(pstate,
898 tf, rtf->alias, is_lateral, true);
899}
900
901/*
902 * transformRangeTableSample --- transform a TABLESAMPLE clause
903 *
904 * Caller has already transformed rts->relation, we just have to validate
905 * the remaining fields and create a TableSampleClause node.
906 */
907static TableSampleClause *
909{
910 TableSampleClause *tablesample;
911 Oid handlerOid;
912 Oid funcargtypes[1];
913 TsmRoutine *tsm;
914 List *fargs;
915 ListCell *larg,
916 *ltyp;
917
918 /*
919 * To validate the sample method name, look up the handler function, which
920 * has the same name, one dummy INTERNAL argument, and a result type of
921 * tsm_handler. (Note: tablesample method names are not schema-qualified
922 * in the SQL standard; but since they are just functions to us, we allow
923 * schema qualification to resolve any potential ambiguity.)
924 */
925 funcargtypes[0] = INTERNALOID;
926
927 handlerOid = LookupFuncName(rts->method, 1, funcargtypes, true);
928
929 /* we want error to complain about no-such-method, not no-such-function */
930 if (!OidIsValid(handlerOid))
932 (errcode(ERRCODE_UNDEFINED_OBJECT),
933 errmsg("tablesample method %s does not exist",
935 parser_errposition(pstate, rts->location)));
936
937 /* check that handler has correct return type */
938 if (get_func_rettype(handlerOid) != TSM_HANDLEROID)
940 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
941 errmsg("function %s must return type %s",
942 NameListToString(rts->method), "tsm_handler"),
943 parser_errposition(pstate, rts->location)));
944
945 /* OK, run the handler to get TsmRoutine, for argument type info */
946 tsm = GetTsmRoutine(handlerOid);
947
948 tablesample = makeNode(TableSampleClause);
949 tablesample->tsmhandler = handlerOid;
950
951 /* check user provided the expected number of arguments */
952 if (list_length(rts->args) != list_length(tsm->parameterTypes))
954 (errcode(ERRCODE_INVALID_TABLESAMPLE_ARGUMENT),
955 errmsg_plural("tablesample method %s requires %d argument, not %d",
956 "tablesample method %s requires %d arguments, not %d",
960 list_length(rts->args)),
961 parser_errposition(pstate, rts->location)));
962
963 /*
964 * Transform the arguments, typecasting them as needed. Note we must also
965 * assign collations now, because assign_query_collations() doesn't
966 * examine any substructure of RTEs.
967 */
968 fargs = NIL;
969 forboth(larg, rts->args, ltyp, tsm->parameterTypes)
970 {
971 Node *arg = (Node *) lfirst(larg);
972 Oid argtype = lfirst_oid(ltyp);
973
975 arg = coerce_to_specific_type(pstate, arg, argtype, "TABLESAMPLE");
977 fargs = lappend(fargs, arg);
978 }
979 tablesample->args = fargs;
980
981 /* Process REPEATABLE (seed) */
982 if (rts->repeatable != NULL)
983 {
984 Node *arg;
985
988 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
989 errmsg("tablesample method %s does not support REPEATABLE",
991 parser_errposition(pstate, rts->location)));
992
994 arg = coerce_to_specific_type(pstate, arg, FLOAT8OID, "REPEATABLE");
996 tablesample->repeatable = (Expr *) arg;
997 }
998 else
999 tablesample->repeatable = NULL;
1000
1001 return tablesample;
1002}
1003
1004/*
1005 * getNSItemForSpecialRelationTypes
1006 *
1007 * If given RangeVar refers to a CTE or an EphemeralNamedRelation,
1008 * build and return an appropriate ParseNamespaceItem, otherwise return NULL
1009 */
1010static ParseNamespaceItem *
1012{
1013 ParseNamespaceItem *nsitem;
1014 CommonTableExpr *cte;
1015 Index levelsup;
1016
1017 /*
1018 * if it is a qualified name, it can't be a CTE or tuplestore reference
1019 */
1020 if (rv->schemaname)
1021 return NULL;
1022
1023 cte = scanNameSpaceForCTE(pstate, rv->relname, &levelsup);
1024 if (cte)
1025 nsitem = addRangeTableEntryForCTE(pstate, cte, levelsup, rv, true);
1026 else if (scanNameSpaceForENR(pstate, rv->relname))
1027 nsitem = addRangeTableEntryForENR(pstate, rv, true);
1028 else
1029 nsitem = NULL;
1030
1031 return nsitem;
1032}
1033
1034/*
1035 * transformFromClauseItem -
1036 * Transform a FROM-clause item, adding any required entries to the
1037 * range table list being built in the ParseState, and return the
1038 * transformed item ready to include in the joinlist. Also build a
1039 * ParseNamespaceItem list describing the names exposed by this item.
1040 * This routine can recurse to handle SQL92 JOIN expressions.
1041 *
1042 * The function return value is the node to add to the jointree (a
1043 * RangeTblRef or JoinExpr). Additional output parameters are:
1044 *
1045 * *top_nsitem: receives the ParseNamespaceItem directly corresponding to the
1046 * jointree item. (This is only used during internal recursion, not by
1047 * outside callers.)
1048 *
1049 * *namespace: receives a List of ParseNamespaceItems for the RTEs exposed
1050 * as table/column names by this item. (The lateral_only flags in these items
1051 * are indeterminate and should be explicitly set by the caller before use.)
1052 */
1053static Node *
1055 ParseNamespaceItem **top_nsitem,
1056 List **namespace)
1057{
1058 /* Guard against stack overflow due to overly deep subtree */
1060
1061 if (IsA(n, RangeVar))
1062 {
1063 /* Plain relation reference, or perhaps a CTE reference */
1064 RangeVar *rv = (RangeVar *) n;
1065 RangeTblRef *rtr;
1066 ParseNamespaceItem *nsitem;
1067
1068 /* Check if it's a CTE or tuplestore reference */
1069 nsitem = getNSItemForSpecialRelationTypes(pstate, rv);
1070
1071 /* if not found above, must be a table reference */
1072 if (!nsitem)
1073 nsitem = transformTableEntry(pstate, rv);
1074
1075 *top_nsitem = nsitem;
1076 *namespace = list_make1(nsitem);
1077 rtr = makeNode(RangeTblRef);
1078 rtr->rtindex = nsitem->p_rtindex;
1079 return (Node *) rtr;
1080 }
1081 else if (IsA(n, RangeSubselect))
1082 {
1083 /* sub-SELECT is like a plain relation */
1084 RangeTblRef *rtr;
1085 ParseNamespaceItem *nsitem;
1086
1087 nsitem = transformRangeSubselect(pstate, (RangeSubselect *) n);
1088 *top_nsitem = nsitem;
1089 *namespace = list_make1(nsitem);
1090 rtr = makeNode(RangeTblRef);
1091 rtr->rtindex = nsitem->p_rtindex;
1092 return (Node *) rtr;
1093 }
1094 else if (IsA(n, RangeFunction))
1095 {
1096 /* function is like a plain relation */
1097 RangeTblRef *rtr;
1098 ParseNamespaceItem *nsitem;
1099
1100 nsitem = transformRangeFunction(pstate, (RangeFunction *) n);
1101 *top_nsitem = nsitem;
1102 *namespace = list_make1(nsitem);
1103 rtr = makeNode(RangeTblRef);
1104 rtr->rtindex = nsitem->p_rtindex;
1105 return (Node *) rtr;
1106 }
1107 else if (IsA(n, RangeTableFunc) || IsA(n, JsonTable))
1108 {
1109 /* table function is like a plain relation */
1110 RangeTblRef *rtr;
1111 ParseNamespaceItem *nsitem;
1112
1113 if (IsA(n, JsonTable))
1114 nsitem = transformJsonTable(pstate, (JsonTable *) n);
1115 else
1116 nsitem = transformRangeTableFunc(pstate, (RangeTableFunc *) n);
1117
1118 *top_nsitem = nsitem;
1119 *namespace = list_make1(nsitem);
1120 rtr = makeNode(RangeTblRef);
1121 rtr->rtindex = nsitem->p_rtindex;
1122 return (Node *) rtr;
1123 }
1124 else if (IsA(n, RangeTableSample))
1125 {
1126 /* TABLESAMPLE clause (wrapping some other valid FROM node) */
1128 Node *rel;
1129 RangeTblEntry *rte;
1130
1131 /* Recursively transform the contained relation */
1132 rel = transformFromClauseItem(pstate, rts->relation,
1133 top_nsitem, namespace);
1134 rte = (*top_nsitem)->p_rte;
1135 /* We only support this on plain relations and matviews */
1136 if (rte->rtekind != RTE_RELATION ||
1137 (rte->relkind != RELKIND_RELATION &&
1138 rte->relkind != RELKIND_MATVIEW &&
1139 rte->relkind != RELKIND_PARTITIONED_TABLE))
1140 ereport(ERROR,
1141 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1142 errmsg("TABLESAMPLE clause can only be applied to tables and materialized views"),
1143 parser_errposition(pstate, exprLocation(rts->relation))));
1144
1145 /* Transform TABLESAMPLE details and attach to the RTE */
1146 rte->tablesample = transformRangeTableSample(pstate, rts);
1147 return rel;
1148 }
1149 else if (IsA(n, JoinExpr))
1150 {
1151 /* A newfangled join expression */
1152 JoinExpr *j = (JoinExpr *) n;
1153 ParseNamespaceItem *nsitem;
1154 ParseNamespaceItem *l_nsitem;
1155 ParseNamespaceItem *r_nsitem;
1156 List *l_namespace,
1157 *r_namespace,
1158 *my_namespace,
1159 *l_colnames,
1160 *r_colnames,
1161 *res_colnames,
1162 *l_colnos,
1163 *r_colnos,
1164 *res_colvars;
1165 ParseNamespaceColumn *l_nscolumns,
1166 *r_nscolumns,
1167 *res_nscolumns;
1168 int res_colindex;
1169 bool lateral_ok;
1170 int sv_namespace_length;
1171 int k;
1172
1173 /*
1174 * Recursively process the left subtree, then the right. We must do
1175 * it in this order for correct visibility of LATERAL references.
1176 */
1177 j->larg = transformFromClauseItem(pstate, j->larg,
1178 &l_nsitem,
1179 &l_namespace);
1180
1181 /*
1182 * Make the left-side RTEs available for LATERAL access within the
1183 * right side, by temporarily adding them to the pstate's namespace
1184 * list. Per SQL:2008, if the join type is not INNER or LEFT then the
1185 * left-side names must still be exposed, but it's an error to
1186 * reference them. (Stupid design, but that's what it says.) Hence,
1187 * we always push them into the namespace, but mark them as not
1188 * lateral_ok if the jointype is wrong.
1189 *
1190 * Notice that we don't require the merged namespace list to be
1191 * conflict-free. See the comments for scanNameSpaceForRefname().
1192 */
1193 lateral_ok = (j->jointype == JOIN_INNER || j->jointype == JOIN_LEFT);
1194 setNamespaceLateralState(l_namespace, true, lateral_ok);
1195
1196 sv_namespace_length = list_length(pstate->p_namespace);
1197 pstate->p_namespace = list_concat(pstate->p_namespace, l_namespace);
1198
1199 /* And now we can process the RHS */
1200 j->rarg = transformFromClauseItem(pstate, j->rarg,
1201 &r_nsitem,
1202 &r_namespace);
1203
1204 /* Remove the left-side RTEs from the namespace list again */
1205 pstate->p_namespace = list_truncate(pstate->p_namespace,
1206 sv_namespace_length);
1207
1208 /*
1209 * Check for conflicting refnames in left and right subtrees. Must do
1210 * this because higher levels will assume I hand back a self-
1211 * consistent namespace list.
1212 */
1213 checkNameSpaceConflicts(pstate, l_namespace, r_namespace);
1214
1215 /*
1216 * Generate combined namespace info for possible use below.
1217 */
1218 my_namespace = list_concat(l_namespace, r_namespace);
1219
1220 /*
1221 * We'll work from the nscolumns data and eref alias column names for
1222 * each of the input nsitems. Note that these include dropped
1223 * columns, which is helpful because we can keep track of physical
1224 * input column numbers more easily.
1225 */
1226 l_nscolumns = l_nsitem->p_nscolumns;
1227 l_colnames = l_nsitem->p_names->colnames;
1228 r_nscolumns = r_nsitem->p_nscolumns;
1229 r_colnames = r_nsitem->p_names->colnames;
1230
1231 /*
1232 * Natural join does not explicitly specify columns; must generate
1233 * columns to join. Need to run through the list of columns from each
1234 * table or join result and match up the column names. Use the first
1235 * table, and check every column in the second table for a match.
1236 * (We'll check that the matches were unique later on.) The result of
1237 * this step is a list of column names just like an explicitly-written
1238 * USING list.
1239 */
1240 if (j->isNatural)
1241 {
1242 List *rlist = NIL;
1243 ListCell *lx,
1244 *rx;
1245
1246 Assert(j->usingClause == NIL); /* shouldn't have USING() too */
1247
1248 foreach(lx, l_colnames)
1249 {
1250 char *l_colname = strVal(lfirst(lx));
1251 String *m_name = NULL;
1252
1253 if (l_colname[0] == '\0')
1254 continue; /* ignore dropped columns */
1255
1256 foreach(rx, r_colnames)
1257 {
1258 char *r_colname = strVal(lfirst(rx));
1259
1260 if (strcmp(l_colname, r_colname) == 0)
1261 {
1262 m_name = makeString(l_colname);
1263 break;
1264 }
1265 }
1266
1267 /* matched a right column? then keep as join column... */
1268 if (m_name != NULL)
1269 rlist = lappend(rlist, m_name);
1270 }
1271
1272 j->usingClause = rlist;
1273 }
1274
1275 /*
1276 * If a USING clause alias was specified, save the USING columns as
1277 * its column list.
1278 */
1279 if (j->join_using_alias)
1280 j->join_using_alias->colnames = j->usingClause;
1281
1282 /*
1283 * Now transform the join qualifications, if any.
1284 */
1285 l_colnos = NIL;
1286 r_colnos = NIL;
1287 res_colnames = NIL;
1288 res_colvars = NIL;
1289
1290 /* this may be larger than needed, but it's not worth being exact */
1291 res_nscolumns = (ParseNamespaceColumn *)
1292 palloc0((list_length(l_colnames) + list_length(r_colnames)) *
1293 sizeof(ParseNamespaceColumn));
1294 res_colindex = 0;
1295
1296 if (j->usingClause)
1297 {
1298 /*
1299 * JOIN/USING (or NATURAL JOIN, as transformed above). Transform
1300 * the list into an explicit ON-condition.
1301 */
1302 List *ucols = j->usingClause;
1303 List *l_usingvars = NIL;
1304 List *r_usingvars = NIL;
1305 ListCell *ucol;
1306
1307 Assert(j->quals == NULL); /* shouldn't have ON() too */
1308
1309 foreach(ucol, ucols)
1310 {
1311 char *u_colname = strVal(lfirst(ucol));
1312 ListCell *col;
1313 int ndx;
1314 int l_index = -1;
1315 int r_index = -1;
1316 Var *l_colvar,
1317 *r_colvar;
1318
1319 Assert(u_colname[0] != '\0');
1320
1321 /* Check for USING(foo,foo) */
1322 foreach(col, res_colnames)
1323 {
1324 char *res_colname = strVal(lfirst(col));
1325
1326 if (strcmp(res_colname, u_colname) == 0)
1327 ereport(ERROR,
1328 (errcode(ERRCODE_DUPLICATE_COLUMN),
1329 errmsg("column name \"%s\" appears more than once in USING clause",
1330 u_colname)));
1331 }
1332
1333 /* Find it in left input */
1334 ndx = 0;
1335 foreach(col, l_colnames)
1336 {
1337 char *l_colname = strVal(lfirst(col));
1338
1339 if (strcmp(l_colname, u_colname) == 0)
1340 {
1341 if (l_index >= 0)
1342 ereport(ERROR,
1343 (errcode(ERRCODE_AMBIGUOUS_COLUMN),
1344 errmsg("common column name \"%s\" appears more than once in left table",
1345 u_colname)));
1346 l_index = ndx;
1347 }
1348 ndx++;
1349 }
1350 if (l_index < 0)
1351 ereport(ERROR,
1352 (errcode(ERRCODE_UNDEFINED_COLUMN),
1353 errmsg("column \"%s\" specified in USING clause does not exist in left table",
1354 u_colname)));
1355 l_colnos = lappend_int(l_colnos, l_index + 1);
1356
1357 /* Find it in right input */
1358 ndx = 0;
1359 foreach(col, r_colnames)
1360 {
1361 char *r_colname = strVal(lfirst(col));
1362
1363 if (strcmp(r_colname, u_colname) == 0)
1364 {
1365 if (r_index >= 0)
1366 ereport(ERROR,
1367 (errcode(ERRCODE_AMBIGUOUS_COLUMN),
1368 errmsg("common column name \"%s\" appears more than once in right table",
1369 u_colname)));
1370 r_index = ndx;
1371 }
1372 ndx++;
1373 }
1374 if (r_index < 0)
1375 ereport(ERROR,
1376 (errcode(ERRCODE_UNDEFINED_COLUMN),
1377 errmsg("column \"%s\" specified in USING clause does not exist in right table",
1378 u_colname)));
1379 r_colnos = lappend_int(r_colnos, r_index + 1);
1380
1381 /* Build Vars to use in the generated JOIN ON clause */
1382 l_colvar = buildVarFromNSColumn(pstate, l_nscolumns + l_index);
1383 l_usingvars = lappend(l_usingvars, l_colvar);
1384 r_colvar = buildVarFromNSColumn(pstate, r_nscolumns + r_index);
1385 r_usingvars = lappend(r_usingvars, r_colvar);
1386
1387 /*
1388 * While we're here, add column names to the res_colnames
1389 * list. It's a bit ugly to do this here while the
1390 * corresponding res_colvars entries are not made till later,
1391 * but doing this later would require an additional traversal
1392 * of the usingClause list.
1393 */
1394 res_colnames = lappend(res_colnames, lfirst(ucol));
1395 }
1396
1397 /* Construct the generated JOIN ON clause */
1398 j->quals = transformJoinUsingClause(pstate,
1399 l_usingvars,
1400 r_usingvars);
1401 }
1402 else if (j->quals)
1403 {
1404 /* User-written ON-condition; transform it */
1405 j->quals = transformJoinOnClause(pstate, j, my_namespace);
1406 }
1407 else
1408 {
1409 /* CROSS JOIN: no quals */
1410 }
1411
1412 /*
1413 * If this is an outer join, now mark the appropriate child RTEs as
1414 * being nulled by this join. We have finished processing the child
1415 * join expressions as well as the current join's quals, which deal in
1416 * non-nulled input columns. All future references to those RTEs will
1417 * see possibly-nulled values, and we should mark generated Vars to
1418 * account for that. In particular, the join alias Vars that we're
1419 * about to build should reflect the nulling effects of this join.
1420 *
1421 * A difficulty with doing this is that we need the join's RT index,
1422 * which we don't officially have yet. However, no other RTE can get
1423 * made between here and the addRangeTableEntryForJoin call, so we can
1424 * predict what the assignment will be. (Alternatively, we could call
1425 * addRangeTableEntryForJoin before we have all the data computed, but
1426 * this seems less ugly.)
1427 */
1428 j->rtindex = list_length(pstate->p_rtable) + 1;
1429
1430 switch (j->jointype)
1431 {
1432 case JOIN_INNER:
1433 break;
1434 case JOIN_LEFT:
1435 markRelsAsNulledBy(pstate, j->rarg, j->rtindex);
1436 break;
1437 case JOIN_FULL:
1438 markRelsAsNulledBy(pstate, j->larg, j->rtindex);
1439 markRelsAsNulledBy(pstate, j->rarg, j->rtindex);
1440 break;
1441 case JOIN_RIGHT:
1442 markRelsAsNulledBy(pstate, j->larg, j->rtindex);
1443 break;
1444 default:
1445 /* shouldn't see any other types here */
1446 elog(ERROR, "unrecognized join type: %d",
1447 (int) j->jointype);
1448 break;
1449 }
1450
1451 /*
1452 * Now we can construct join alias expressions for the USING columns.
1453 */
1454 if (j->usingClause)
1455 {
1456 ListCell *lc1,
1457 *lc2;
1458
1459 /* Scan the colnos lists to recover info from the previous loop */
1460 forboth(lc1, l_colnos, lc2, r_colnos)
1461 {
1462 int l_index = lfirst_int(lc1) - 1;
1463 int r_index = lfirst_int(lc2) - 1;
1464 Var *l_colvar,
1465 *r_colvar;
1466 Node *u_colvar;
1467 ParseNamespaceColumn *res_nscolumn;
1468
1469 /*
1470 * Note we re-build these Vars: they might have different
1471 * varnullingrels than the ones made in the previous loop.
1472 */
1473 l_colvar = buildVarFromNSColumn(pstate, l_nscolumns + l_index);
1474 r_colvar = buildVarFromNSColumn(pstate, r_nscolumns + r_index);
1475
1476 /* Construct the join alias Var for this column */
1477 u_colvar = buildMergedJoinVar(pstate,
1478 j->jointype,
1479 l_colvar,
1480 r_colvar);
1481 res_colvars = lappend(res_colvars, u_colvar);
1482
1483 /* Construct column's res_nscolumns[] entry */
1484 res_nscolumn = res_nscolumns + res_colindex;
1485 res_colindex++;
1486 if (u_colvar == (Node *) l_colvar)
1487 {
1488 /* Merged column is equivalent to left input */
1489 *res_nscolumn = l_nscolumns[l_index];
1490 }
1491 else if (u_colvar == (Node *) r_colvar)
1492 {
1493 /* Merged column is equivalent to right input */
1494 *res_nscolumn = r_nscolumns[r_index];
1495 }
1496 else
1497 {
1498 /*
1499 * Merged column is not semantically equivalent to either
1500 * input, so it needs to be referenced as the join output
1501 * column.
1502 */
1503 res_nscolumn->p_varno = j->rtindex;
1504 res_nscolumn->p_varattno = res_colindex;
1505 res_nscolumn->p_vartype = exprType(u_colvar);
1506 res_nscolumn->p_vartypmod = exprTypmod(u_colvar);
1507 res_nscolumn->p_varcollid = exprCollation(u_colvar);
1508 res_nscolumn->p_varnosyn = j->rtindex;
1509 res_nscolumn->p_varattnosyn = res_colindex;
1510 }
1511 }
1512 }
1513
1514 /* Add remaining columns from each side to the output columns */
1515 res_colindex +=
1517 l_nscolumns, l_colnames, &l_colnos,
1518 &res_colnames, &res_colvars,
1519 res_nscolumns + res_colindex);
1520 res_colindex +=
1522 r_nscolumns, r_colnames, &r_colnos,
1523 &res_colnames, &res_colvars,
1524 res_nscolumns + res_colindex);
1525
1526 /* If join has an alias, it syntactically hides all inputs */
1527 if (j->alias)
1528 {
1529 for (k = 0; k < res_colindex; k++)
1530 {
1531 ParseNamespaceColumn *nscol = res_nscolumns + k;
1532
1533 nscol->p_varnosyn = j->rtindex;
1534 nscol->p_varattnosyn = k + 1;
1535 }
1536 }
1537
1538 /*
1539 * Now build an RTE and nsitem for the result of the join.
1540 */
1541 nsitem = addRangeTableEntryForJoin(pstate,
1542 res_colnames,
1543 res_nscolumns,
1544 j->jointype,
1545 list_length(j->usingClause),
1546 res_colvars,
1547 l_colnos,
1548 r_colnos,
1549 j->join_using_alias,
1550 j->alias,
1551 true);
1552
1553 /* Verify that we correctly predicted the join's RT index */
1554 Assert(j->rtindex == nsitem->p_rtindex);
1555 /* Cross-check number of columns, too */
1556 Assert(res_colindex == list_length(nsitem->p_names->colnames));
1557
1558 /*
1559 * Save a link to the JoinExpr in the proper element of p_joinexprs.
1560 * Since we maintain that list lazily, it may be necessary to fill in
1561 * empty entries before we can add the JoinExpr in the right place.
1562 */
1563 for (k = list_length(pstate->p_joinexprs) + 1; k < j->rtindex; k++)
1564 pstate->p_joinexprs = lappend(pstate->p_joinexprs, NULL);
1565 pstate->p_joinexprs = lappend(pstate->p_joinexprs, j);
1566 Assert(list_length(pstate->p_joinexprs) == j->rtindex);
1567
1568 /*
1569 * If the join has a USING alias, build a ParseNamespaceItem for that
1570 * and add it to the list of nsitems in the join's input.
1571 */
1572 if (j->join_using_alias)
1573 {
1574 ParseNamespaceItem *jnsitem;
1575
1576 jnsitem = (ParseNamespaceItem *) palloc(sizeof(ParseNamespaceItem));
1577 jnsitem->p_names = j->join_using_alias;
1578 jnsitem->p_rte = nsitem->p_rte;
1579 jnsitem->p_rtindex = nsitem->p_rtindex;
1580 jnsitem->p_perminfo = NULL;
1581 /* no need to copy the first N columns, just use res_nscolumns */
1582 jnsitem->p_nscolumns = res_nscolumns;
1583 /* set default visibility flags; might get changed later */
1584 jnsitem->p_rel_visible = true;
1585 jnsitem->p_cols_visible = true;
1586 jnsitem->p_lateral_only = false;
1587 jnsitem->p_lateral_ok = true;
1589 /* Per SQL, we must check for alias conflicts */
1590 checkNameSpaceConflicts(pstate, list_make1(jnsitem), my_namespace);
1591 my_namespace = lappend(my_namespace, jnsitem);
1592 }
1593
1594 /*
1595 * Prepare returned namespace list. If the JOIN has an alias then it
1596 * hides the contained RTEs completely; otherwise, the contained RTEs
1597 * are still visible as table names, but are not visible for
1598 * unqualified column-name access.
1599 *
1600 * Note: if there are nested alias-less JOINs, the lower-level ones
1601 * will remain in the list although they have neither p_rel_visible
1602 * nor p_cols_visible set. We could delete such list items, but it's
1603 * unclear that it's worth expending cycles to do so.
1604 */
1605 if (j->alias != NULL)
1606 my_namespace = NIL;
1607 else
1608 setNamespaceColumnVisibility(my_namespace, false);
1609
1610 /*
1611 * The join RTE itself is always made visible for unqualified column
1612 * names. It's visible as a relation name only if it has an alias.
1613 */
1614 nsitem->p_rel_visible = (j->alias != NULL);
1615 nsitem->p_cols_visible = true;
1616 nsitem->p_lateral_only = false;
1617 nsitem->p_lateral_ok = true;
1618
1619 *top_nsitem = nsitem;
1620 *namespace = lappend(my_namespace, nsitem);
1621
1622 return (Node *) j;
1623 }
1624 else
1625 elog(ERROR, "unrecognized node type: %d", (int) nodeTag(n));
1626 return NULL; /* can't get here, keep compiler quiet */
1627}
1628
1629/*
1630 * buildVarFromNSColumn -
1631 * build a Var node using ParseNamespaceColumn data
1632 *
1633 * This is used to construct joinaliasvars entries.
1634 * We can assume varlevelsup should be 0, and no location is specified.
1635 * Note also that no column SELECT privilege is requested here; that would
1636 * happen only if the column is actually referenced in the query.
1637 */
1638static Var *
1640{
1641 Var *var;
1642
1643 Assert(nscol->p_varno > 0); /* i.e., not deleted column */
1644 var = makeVar(nscol->p_varno,
1645 nscol->p_varattno,
1646 nscol->p_vartype,
1647 nscol->p_vartypmod,
1648 nscol->p_varcollid,
1649 0);
1650 /* makeVar doesn't offer parameters for these, so set by hand: */
1652 var->varnosyn = nscol->p_varnosyn;
1653 var->varattnosyn = nscol->p_varattnosyn;
1654
1655 /* ... and update varnullingrels */
1656 markNullableIfNeeded(pstate, var);
1657
1658 return var;
1659}
1660
1661/*
1662 * buildMergedJoinVar -
1663 * generate a suitable replacement expression for a merged join column
1664 */
1665static Node *
1667 Var *l_colvar, Var *r_colvar)
1668{
1669 Oid outcoltype;
1670 int32 outcoltypmod;
1671 Node *l_node,
1672 *r_node,
1673 *res_node;
1674
1675 outcoltype = select_common_type(pstate,
1676 list_make2(l_colvar, r_colvar),
1677 "JOIN/USING",
1678 NULL);
1679 outcoltypmod = select_common_typmod(pstate,
1680 list_make2(l_colvar, r_colvar),
1681 outcoltype);
1682
1683 /*
1684 * Insert coercion functions if needed. Note that a difference in typmod
1685 * can only happen if input has typmod but outcoltypmod is -1. In that
1686 * case we insert a RelabelType to clearly mark that result's typmod is
1687 * not same as input. We never need coerce_type_typmod.
1688 */
1689 if (l_colvar->vartype != outcoltype)
1690 l_node = coerce_type(pstate, (Node *) l_colvar, l_colvar->vartype,
1691 outcoltype, outcoltypmod,
1693 else if (l_colvar->vartypmod != outcoltypmod)
1694 l_node = (Node *) makeRelabelType((Expr *) l_colvar,
1695 outcoltype, outcoltypmod,
1696 InvalidOid, /* fixed below */
1698 else
1699 l_node = (Node *) l_colvar;
1700
1701 if (r_colvar->vartype != outcoltype)
1702 r_node = coerce_type(pstate, (Node *) r_colvar, r_colvar->vartype,
1703 outcoltype, outcoltypmod,
1705 else if (r_colvar->vartypmod != outcoltypmod)
1706 r_node = (Node *) makeRelabelType((Expr *) r_colvar,
1707 outcoltype, outcoltypmod,
1708 InvalidOid, /* fixed below */
1710 else
1711 r_node = (Node *) r_colvar;
1712
1713 /*
1714 * Choose what to emit
1715 */
1716 switch (jointype)
1717 {
1718 case JOIN_INNER:
1719
1720 /*
1721 * We can use either var; prefer non-coerced one if available.
1722 */
1723 if (IsA(l_node, Var))
1724 res_node = l_node;
1725 else if (IsA(r_node, Var))
1726 res_node = r_node;
1727 else
1728 res_node = l_node;
1729 break;
1730 case JOIN_LEFT:
1731 /* Always use left var */
1732 res_node = l_node;
1733 break;
1734 case JOIN_RIGHT:
1735 /* Always use right var */
1736 res_node = r_node;
1737 break;
1738 case JOIN_FULL:
1739 {
1740 /*
1741 * Here we must build a COALESCE expression to ensure that the
1742 * join output is non-null if either input is.
1743 */
1745
1746 c->coalescetype = outcoltype;
1747 /* coalescecollid will get set below */
1748 c->args = list_make2(l_node, r_node);
1749 c->location = -1;
1750 res_node = (Node *) c;
1751 break;
1752 }
1753 default:
1754 elog(ERROR, "unrecognized join type: %d", (int) jointype);
1755 res_node = NULL; /* keep compiler quiet */
1756 break;
1757 }
1758
1759 /*
1760 * Apply assign_expr_collations to fix up the collation info in the
1761 * coercion and CoalesceExpr nodes, if we made any. This must be done now
1762 * so that the join node's alias vars show correct collation info.
1763 */
1764 assign_expr_collations(pstate, res_node);
1765
1766 return res_node;
1767}
1768
1769/*
1770 * markRelsAsNulledBy -
1771 * Mark the given jointree node and its children as nulled by join jindex
1772 */
1773static void
1774markRelsAsNulledBy(ParseState *pstate, Node *n, int jindex)
1775{
1776 int varno;
1777 ListCell *lc;
1778
1779 /* Note: we can't see FromExpr here */
1780 if (IsA(n, RangeTblRef))
1781 {
1782 varno = ((RangeTblRef *) n)->rtindex;
1783 }
1784 else if (IsA(n, JoinExpr))
1785 {
1786 JoinExpr *j = (JoinExpr *) n;
1787
1788 /* recurse to children */
1789 markRelsAsNulledBy(pstate, j->larg, jindex);
1790 markRelsAsNulledBy(pstate, j->rarg, jindex);
1791 varno = j->rtindex;
1792 }
1793 else
1794 {
1795 elog(ERROR, "unrecognized node type: %d", (int) nodeTag(n));
1796 varno = 0; /* keep compiler quiet */
1797 }
1798
1799 /*
1800 * Now add jindex to the p_nullingrels set for relation varno. Since we
1801 * maintain the p_nullingrels list lazily, we might need to extend it to
1802 * make the varno'th entry exist.
1803 */
1804 while (list_length(pstate->p_nullingrels) < varno)
1805 pstate->p_nullingrels = lappend(pstate->p_nullingrels, NULL);
1806 lc = list_nth_cell(pstate->p_nullingrels, varno - 1);
1807 lfirst(lc) = bms_add_member((Bitmapset *) lfirst(lc), jindex);
1808}
1809
1810/*
1811 * setNamespaceColumnVisibility -
1812 * Convenience subroutine to update cols_visible flags in a namespace list.
1813 */
1814static void
1815setNamespaceColumnVisibility(List *namespace, bool cols_visible)
1816{
1817 ListCell *lc;
1818
1819 foreach(lc, namespace)
1820 {
1822
1823 nsitem->p_cols_visible = cols_visible;
1824 }
1825}
1826
1827/*
1828 * setNamespaceLateralState -
1829 * Convenience subroutine to update LATERAL flags in a namespace list.
1830 */
1831static void
1832setNamespaceLateralState(List *namespace, bool lateral_only, bool lateral_ok)
1833{
1834 ListCell *lc;
1835
1836 foreach(lc, namespace)
1837 {
1839
1840 nsitem->p_lateral_only = lateral_only;
1841 nsitem->p_lateral_ok = lateral_ok;
1842 }
1843}
1844
1845
1846/*
1847 * transformWhereClause -
1848 * Transform the qualification and make sure it is of type boolean.
1849 * Used for WHERE and allied clauses.
1850 *
1851 * constructName does not affect the semantics, but is used in error messages
1852 */
1853Node *
1855 ParseExprKind exprKind, const char *constructName)
1856{
1857 Node *qual;
1858
1859 if (clause == NULL)
1860 return NULL;
1861
1862 qual = transformExpr(pstate, clause, exprKind);
1863
1864 qual = coerce_to_boolean(pstate, qual, constructName);
1865
1866 return qual;
1867}
1868
1869
1870/*
1871 * transformLimitClause -
1872 * Transform the expression and make sure it is of type bigint.
1873 * Used for LIMIT and allied clauses.
1874 *
1875 * Note: as of Postgres 8.2, LIMIT expressions are expected to yield int8,
1876 * rather than int4 as before.
1877 *
1878 * constructName does not affect the semantics, but is used in error messages
1879 */
1880Node *
1882 ParseExprKind exprKind, const char *constructName,
1883 LimitOption limitOption)
1884{
1885 Node *qual;
1886
1887 if (clause == NULL)
1888 return NULL;
1889
1890 qual = transformExpr(pstate, clause, exprKind);
1891
1892 qual = coerce_to_specific_type(pstate, qual, INT8OID, constructName);
1893
1894 /* LIMIT can't refer to any variables of the current query */
1895 checkExprIsVarFree(pstate, qual, constructName);
1896
1897 /*
1898 * Don't allow NULLs in FETCH FIRST .. WITH TIES. This test is ugly and
1899 * extremely simplistic, in that you can pass a NULL anyway by hiding it
1900 * inside an expression -- but this protects ruleutils against emitting an
1901 * unadorned NULL that's not accepted back by the grammar.
1902 */
1903 if (exprKind == EXPR_KIND_LIMIT && limitOption == LIMIT_OPTION_WITH_TIES &&
1904 IsA(clause, A_Const) && castNode(A_Const, clause)->isnull)
1905 ereport(ERROR,
1906 (errcode(ERRCODE_INVALID_ROW_COUNT_IN_LIMIT_CLAUSE),
1907 errmsg("row count cannot be null in FETCH FIRST ... WITH TIES clause")));
1908
1909 return qual;
1910}
1911
1912/*
1913 * checkExprIsVarFree
1914 * Check that given expr has no Vars of the current query level
1915 * (aggregates and window functions should have been rejected already).
1916 *
1917 * This is used to check expressions that have to have a consistent value
1918 * across all rows of the query, such as a LIMIT. Arguably it should reject
1919 * volatile functions, too, but we don't do that --- whatever value the
1920 * function gives on first execution is what you get.
1921 *
1922 * constructName does not affect the semantics, but is used in error messages
1923 */
1924static void
1925checkExprIsVarFree(ParseState *pstate, Node *n, const char *constructName)
1926{
1927 if (contain_vars_of_level(n, 0))
1928 {
1929 ereport(ERROR,
1930 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
1931 /* translator: %s is name of a SQL construct, eg LIMIT */
1932 errmsg("argument of %s must not contain variables",
1933 constructName),
1934 parser_errposition(pstate,
1935 locate_var_of_level(n, 0))));
1936 }
1937}
1938
1939
1940/*
1941 * checkTargetlistEntrySQL92 -
1942 * Validate a targetlist entry found by findTargetlistEntrySQL92
1943 *
1944 * When we select a pre-existing tlist entry as a result of syntax such
1945 * as "GROUP BY 1", we have to make sure it is acceptable for use in the
1946 * indicated clause type; transformExpr() will have treated it as a regular
1947 * targetlist item.
1948 */
1949static void
1951 ParseExprKind exprKind)
1952{
1953 switch (exprKind)
1954 {
1955 case EXPR_KIND_GROUP_BY:
1956 /* reject aggregates and window functions */
1957 if (pstate->p_hasAggs &&
1958 contain_aggs_of_level((Node *) tle->expr, 0))
1959 ereport(ERROR,
1960 (errcode(ERRCODE_GROUPING_ERROR),
1961 /* translator: %s is name of a SQL construct, eg GROUP BY */
1962 errmsg("aggregate functions are not allowed in %s",
1963 ParseExprKindName(exprKind)),
1964 parser_errposition(pstate,
1965 locate_agg_of_level((Node *) tle->expr, 0))));
1966 if (pstate->p_hasWindowFuncs &&
1967 contain_windowfuncs((Node *) tle->expr))
1968 ereport(ERROR,
1969 (errcode(ERRCODE_WINDOWING_ERROR),
1970 /* translator: %s is name of a SQL construct, eg GROUP BY */
1971 errmsg("window functions are not allowed in %s",
1972 ParseExprKindName(exprKind)),
1973 parser_errposition(pstate,
1974 locate_windowfunc((Node *) tle->expr))));
1975 break;
1976 case EXPR_KIND_ORDER_BY:
1977 /* no extra checks needed */
1978 break;
1980 /* no extra checks needed */
1981 break;
1982 default:
1983 elog(ERROR, "unexpected exprKind in checkTargetlistEntrySQL92");
1984 break;
1985 }
1986}
1987
1988/*
1989 * findTargetlistEntrySQL92 -
1990 * Returns the targetlist entry matching the given (untransformed) node.
1991 * If no matching entry exists, one is created and appended to the target
1992 * list as a "resjunk" node.
1993 *
1994 * This function supports the old SQL92 ORDER BY interpretation, where the
1995 * expression is an output column name or number. If we fail to find a
1996 * match of that sort, we fall through to the SQL99 rules. For historical
1997 * reasons, Postgres also allows this interpretation for GROUP BY, though
1998 * the standard never did. However, for GROUP BY we prefer a SQL99 match.
1999 * This function is *not* used for WINDOW definitions.
2000 *
2001 * node the ORDER BY, GROUP BY, or DISTINCT ON expression to be matched
2002 * tlist the target list (passed by reference so we can append to it)
2003 * exprKind identifies clause type being processed
2004 */
2005static TargetEntry *
2007 ParseExprKind exprKind)
2008{
2009 ListCell *tl;
2010
2011 /*----------
2012 * Handle two special cases as mandated by the SQL92 spec:
2013 *
2014 * 1. Bare ColumnName (no qualifier or subscripts)
2015 * For a bare identifier, we search for a matching column name
2016 * in the existing target list. Multiple matches are an error
2017 * unless they refer to identical values; for example,
2018 * we allow SELECT a, a FROM table ORDER BY a
2019 * but not SELECT a AS b, b FROM table ORDER BY b
2020 * If no match is found, we fall through and treat the identifier
2021 * as an expression.
2022 * For GROUP BY, it is incorrect to match the grouping item against
2023 * targetlist entries: according to SQL92, an identifier in GROUP BY
2024 * is a reference to a column name exposed by FROM, not to a target
2025 * list column. However, many implementations (including pre-7.0
2026 * PostgreSQL) accept this anyway. So for GROUP BY, we look first
2027 * to see if the identifier matches any FROM column name, and only
2028 * try for a targetlist name if it doesn't. This ensures that we
2029 * adhere to the spec in the case where the name could be both.
2030 * DISTINCT ON isn't in the standard, so we can do what we like there;
2031 * we choose to make it work like ORDER BY, on the rather flimsy
2032 * grounds that ordinary DISTINCT works on targetlist entries.
2033 *
2034 * 2. IntegerConstant
2035 * This means to use the n'th item in the existing target list.
2036 * Note that it would make no sense to order/group/distinct by an
2037 * actual constant, so this does not create a conflict with SQL99.
2038 * GROUP BY column-number is not allowed by SQL92, but since
2039 * the standard has no other behavior defined for this syntax,
2040 * we may as well accept this common extension.
2041 *
2042 * Note that pre-existing resjunk targets must not be used in either case,
2043 * since the user didn't write them in his SELECT list.
2044 *
2045 * If neither special case applies, fall through to treat the item as
2046 * an expression per SQL99.
2047 *----------
2048 */
2049 if (IsA(node, ColumnRef) &&
2050 list_length(((ColumnRef *) node)->fields) == 1 &&
2051 IsA(linitial(((ColumnRef *) node)->fields), String))
2052 {
2053 char *name = strVal(linitial(((ColumnRef *) node)->fields));
2054 int location = ((ColumnRef *) node)->location;
2055
2056 if (exprKind == EXPR_KIND_GROUP_BY)
2057 {
2058 /*
2059 * In GROUP BY, we must prefer a match against a FROM-clause
2060 * column to one against the targetlist. Look to see if there is
2061 * a matching column. If so, fall through to use SQL99 rules.
2062 * NOTE: if name could refer ambiguously to more than one column
2063 * name exposed by FROM, colNameToVar will ereport(ERROR). That's
2064 * just what we want here.
2065 *
2066 * Small tweak for 7.4.3: ignore matches in upper query levels.
2067 * This effectively changes the search order for bare names to (1)
2068 * local FROM variables, (2) local targetlist aliases, (3) outer
2069 * FROM variables, whereas before it was (1) (3) (2). SQL92 and
2070 * SQL99 do not allow GROUPing BY an outer reference, so this
2071 * breaks no cases that are legal per spec, and it seems a more
2072 * self-consistent behavior.
2073 */
2074 if (colNameToVar(pstate, name, true, location) != NULL)
2075 name = NULL;
2076 }
2077
2078 if (name != NULL)
2079 {
2080 TargetEntry *target_result = NULL;
2081
2082 foreach(tl, *tlist)
2083 {
2084 TargetEntry *tle = (TargetEntry *) lfirst(tl);
2085
2086 if (!tle->resjunk &&
2087 strcmp(tle->resname, name) == 0)
2088 {
2089 if (target_result != NULL)
2090 {
2091 if (!equal(target_result->expr, tle->expr))
2092 ereport(ERROR,
2093 (errcode(ERRCODE_AMBIGUOUS_COLUMN),
2094
2095 /*------
2096 translator: first %s is name of a SQL construct, eg ORDER BY */
2097 errmsg("%s \"%s\" is ambiguous",
2098 ParseExprKindName(exprKind),
2099 name),
2100 parser_errposition(pstate, location)));
2101 }
2102 else
2103 target_result = tle;
2104 /* Stay in loop to check for ambiguity */
2105 }
2106 }
2107 if (target_result != NULL)
2108 {
2109 /* return the first match, after suitable validation */
2110 checkTargetlistEntrySQL92(pstate, target_result, exprKind);
2111 return target_result;
2112 }
2113 }
2114 }
2115 if (IsA(node, A_Const))
2116 {
2117 A_Const *aconst = castNode(A_Const, node);
2118 int targetlist_pos = 0;
2119 int target_pos;
2120
2121 if (!IsA(&aconst->val, Integer))
2122 ereport(ERROR,
2123 (errcode(ERRCODE_SYNTAX_ERROR),
2124 /* translator: %s is name of a SQL construct, eg ORDER BY */
2125 errmsg("non-integer constant in %s",
2126 ParseExprKindName(exprKind)),
2127 parser_errposition(pstate, aconst->location)));
2128
2129 target_pos = intVal(&aconst->val);
2130 foreach(tl, *tlist)
2131 {
2132 TargetEntry *tle = (TargetEntry *) lfirst(tl);
2133
2134 if (!tle->resjunk)
2135 {
2136 if (++targetlist_pos == target_pos)
2137 {
2138 /* return the unique match, after suitable validation */
2139 checkTargetlistEntrySQL92(pstate, tle, exprKind);
2140 return tle;
2141 }
2142 }
2143 }
2144 ereport(ERROR,
2145 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2146 /* translator: %s is name of a SQL construct, eg ORDER BY */
2147 errmsg("%s position %d is not in select list",
2148 ParseExprKindName(exprKind), target_pos),
2149 parser_errposition(pstate, aconst->location)));
2150 }
2151
2152 /*
2153 * Otherwise, we have an expression, so process it per SQL99 rules.
2154 */
2155 return findTargetlistEntrySQL99(pstate, node, tlist, exprKind);
2156}
2157
2158/*
2159 * findTargetlistEntrySQL99 -
2160 * Returns the targetlist entry matching the given (untransformed) node.
2161 * If no matching entry exists, one is created and appended to the target
2162 * list as a "resjunk" node.
2163 *
2164 * This function supports the SQL99 interpretation, wherein the expression
2165 * is just an ordinary expression referencing input column names.
2166 *
2167 * node the ORDER BY, GROUP BY, etc expression to be matched
2168 * tlist the target list (passed by reference so we can append to it)
2169 * exprKind identifies clause type being processed
2170 */
2171static TargetEntry *
2173 ParseExprKind exprKind)
2174{
2175 TargetEntry *target_result;
2176 ListCell *tl;
2177 Node *expr;
2178
2179 /*
2180 * Convert the untransformed node to a transformed expression, and search
2181 * for a match in the tlist. NOTE: it doesn't really matter whether there
2182 * is more than one match. Also, we are willing to match an existing
2183 * resjunk target here, though the SQL92 cases above must ignore resjunk
2184 * targets.
2185 */
2186 expr = transformExpr(pstate, node, exprKind);
2187
2188 foreach(tl, *tlist)
2189 {
2190 TargetEntry *tle = (TargetEntry *) lfirst(tl);
2191 Node *texpr;
2192
2193 /*
2194 * Ignore any implicit cast on the existing tlist expression.
2195 *
2196 * This essentially allows the ORDER/GROUP/etc item to adopt the same
2197 * datatype previously selected for a textually-equivalent tlist item.
2198 * There can't be any implicit cast at top level in an ordinary SELECT
2199 * tlist at this stage, but the case does arise with ORDER BY in an
2200 * aggregate function.
2201 */
2202 texpr = strip_implicit_coercions((Node *) tle->expr);
2203
2204 if (equal(expr, texpr))
2205 return tle;
2206 }
2207
2208 /*
2209 * If no matches, construct a new target entry which is appended to the
2210 * end of the target list. This target is given resjunk = true so that it
2211 * will not be projected into the final tuple.
2212 */
2213 target_result = transformTargetEntry(pstate, node, expr, exprKind,
2214 NULL, true);
2215
2216 *tlist = lappend(*tlist, target_result);
2217
2218 return target_result;
2219}
2220
2221/*-------------------------------------------------------------------------
2222 * Flatten out parenthesized sublists in grouping lists, and some cases
2223 * of nested grouping sets.
2224 *
2225 * Inside a grouping set (ROLLUP, CUBE, or GROUPING SETS), we expect the
2226 * content to be nested no more than 2 deep: i.e. ROLLUP((a,b),(c,d)) is
2227 * ok, but ROLLUP((a,(b,c)),d) is flattened to ((a,b,c),d), which we then
2228 * (later) normalize to ((a,b,c),(d)).
2229 *
2230 * CUBE or ROLLUP can be nested inside GROUPING SETS (but not the reverse),
2231 * and we leave that alone if we find it. But if we see GROUPING SETS inside
2232 * GROUPING SETS, we can flatten and normalize as follows:
2233 * GROUPING SETS (a, (b,c), GROUPING SETS ((c,d),(e)), (f,g))
2234 * becomes
2235 * GROUPING SETS ((a), (b,c), (c,d), (e), (f,g))
2236 *
2237 * This is per the spec's syntax transformations, but these are the only such
2238 * transformations we do in parse analysis, so that queries retain the
2239 * originally specified grouping set syntax for CUBE and ROLLUP as much as
2240 * possible when deparsed. (Full expansion of the result into a list of
2241 * grouping sets is left to the planner.)
2242 *
2243 * When we're done, the resulting list should contain only these possible
2244 * elements:
2245 * - an expression
2246 * - a CUBE or ROLLUP with a list of expressions nested 2 deep
2247 * - a GROUPING SET containing any of:
2248 * - expression lists
2249 * - empty grouping sets
2250 * - CUBE or ROLLUP nodes with lists nested 2 deep
2251 * The return is a new list, but doesn't deep-copy the old nodes except for
2252 * GroupingSet nodes.
2253 *
2254 * As a side effect, flag whether the list has any GroupingSet nodes.
2255 *-------------------------------------------------------------------------
2256 */
2257static Node *
2258flatten_grouping_sets(Node *expr, bool toplevel, bool *hasGroupingSets)
2259{
2260 /* just in case of pathological input */
2262
2263 if (expr == (Node *) NIL)
2264 return (Node *) NIL;
2265
2266 switch (expr->type)
2267 {
2268 case T_RowExpr:
2269 {
2270 RowExpr *r = (RowExpr *) expr;
2271
2272 if (r->row_format == COERCE_IMPLICIT_CAST)
2273 return flatten_grouping_sets((Node *) r->args,
2274 false, NULL);
2275 }
2276 break;
2277 case T_GroupingSet:
2278 {
2279 GroupingSet *gset = (GroupingSet *) expr;
2280 ListCell *l2;
2281 List *result_set = NIL;
2282
2283 if (hasGroupingSets)
2284 *hasGroupingSets = true;
2285
2286 /*
2287 * at the top level, we skip over all empty grouping sets; the
2288 * caller can supply the canonical GROUP BY () if nothing is
2289 * left.
2290 */
2291
2292 if (toplevel && gset->kind == GROUPING_SET_EMPTY)
2293 return (Node *) NIL;
2294
2295 foreach(l2, gset->content)
2296 {
2297 Node *n1 = lfirst(l2);
2298 Node *n2 = flatten_grouping_sets(n1, false, NULL);
2299
2300 if (IsA(n1, GroupingSet) &&
2301 ((GroupingSet *) n1)->kind == GROUPING_SET_SETS)
2302 result_set = list_concat(result_set, (List *) n2);
2303 else
2304 result_set = lappend(result_set, n2);
2305 }
2306
2307 /*
2308 * At top level, keep the grouping set node; but if we're in a
2309 * nested grouping set, then we need to concat the flattened
2310 * result into the outer list if it's simply nested.
2311 */
2312
2313 if (toplevel || (gset->kind != GROUPING_SET_SETS))
2314 {
2315 return (Node *) makeGroupingSet(gset->kind, result_set, gset->location);
2316 }
2317 else
2318 return (Node *) result_set;
2319 }
2320 case T_List:
2321 {
2322 List *result = NIL;
2323 ListCell *l;
2324
2325 foreach(l, (List *) expr)
2326 {
2327 Node *n = flatten_grouping_sets(lfirst(l), toplevel, hasGroupingSets);
2328
2329 if (n != (Node *) NIL)
2330 {
2331 if (IsA(n, List))
2332 result = list_concat(result, (List *) n);
2333 else
2334 result = lappend(result, n);
2335 }
2336 }
2337
2338 return (Node *) result;
2339 }
2340 default:
2341 break;
2342 }
2343
2344 return expr;
2345}
2346
2347/*
2348 * Transform a single expression within a GROUP BY clause or grouping set.
2349 *
2350 * The expression is added to the targetlist if not already present, and to the
2351 * flatresult list (which will become the groupClause) if not already present
2352 * there. The sortClause is consulted for operator and sort order hints.
2353 *
2354 * Returns the ressortgroupref of the expression.
2355 *
2356 * flatresult reference to flat list of SortGroupClause nodes
2357 * seen_local bitmapset of sortgrouprefs already seen at the local level
2358 * pstate ParseState
2359 * gexpr node to transform
2360 * targetlist reference to TargetEntry list
2361 * sortClause ORDER BY clause (SortGroupClause nodes)
2362 * exprKind expression kind
2363 * useSQL99 SQL99 rather than SQL92 syntax
2364 * toplevel false if within any grouping set
2365 */
2366static Index
2367transformGroupClauseExpr(List **flatresult, Bitmapset *seen_local,
2368 ParseState *pstate, Node *gexpr,
2369 List **targetlist, List *sortClause,
2370 ParseExprKind exprKind, bool useSQL99, bool toplevel)
2371{
2372 TargetEntry *tle;
2373 bool found = false;
2374
2375 if (useSQL99)
2376 tle = findTargetlistEntrySQL99(pstate, gexpr,
2377 targetlist, exprKind);
2378 else
2379 tle = findTargetlistEntrySQL92(pstate, gexpr,
2380 targetlist, exprKind);
2381
2382 if (tle->ressortgroupref > 0)
2383 {
2384 ListCell *sl;
2385
2386 /*
2387 * Eliminate duplicates (GROUP BY x, x) but only at local level.
2388 * (Duplicates in grouping sets can affect the number of returned
2389 * rows, so can't be dropped indiscriminately.)
2390 *
2391 * Since we don't care about anything except the sortgroupref, we can
2392 * use a bitmapset rather than scanning lists.
2393 */
2394 if (bms_is_member(tle->ressortgroupref, seen_local))
2395 return 0;
2396
2397 /*
2398 * If we're already in the flat clause list, we don't need to consider
2399 * adding ourselves again.
2400 */
2401 found = targetIsInSortList(tle, InvalidOid, *flatresult);
2402 if (found)
2403 return tle->ressortgroupref;
2404
2405 /*
2406 * If the GROUP BY tlist entry also appears in ORDER BY, copy operator
2407 * info from the (first) matching ORDER BY item. This means that if
2408 * you write something like "GROUP BY foo ORDER BY foo USING <<<", the
2409 * GROUP BY operation silently takes on the equality semantics implied
2410 * by the ORDER BY. There are two reasons to do this: it improves the
2411 * odds that we can implement both GROUP BY and ORDER BY with a single
2412 * sort step, and it allows the user to choose the equality semantics
2413 * used by GROUP BY, should she be working with a datatype that has
2414 * more than one equality operator.
2415 *
2416 * If we're in a grouping set, though, we force our requested ordering
2417 * to be NULLS LAST, because if we have any hope of using a sorted agg
2418 * for the job, we're going to be tacking on generated NULL values
2419 * after the corresponding groups. If the user demands nulls first,
2420 * another sort step is going to be inevitable, but that's the
2421 * planner's problem.
2422 */
2423
2424 foreach(sl, sortClause)
2425 {
2427
2428 if (sc->tleSortGroupRef == tle->ressortgroupref)
2429 {
2430 SortGroupClause *grpc = copyObject(sc);
2431
2432 if (!toplevel)
2433 grpc->nulls_first = false;
2434 *flatresult = lappend(*flatresult, grpc);
2435 found = true;
2436 break;
2437 }
2438 }
2439 }
2440
2441 /*
2442 * If no match in ORDER BY, just add it to the result using default
2443 * sort/group semantics.
2444 */
2445 if (!found)
2446 *flatresult = addTargetToGroupList(pstate, tle,
2447 *flatresult, *targetlist,
2448 exprLocation(gexpr));
2449
2450 /*
2451 * _something_ must have assigned us a sortgroupref by now...
2452 */
2453
2454 return tle->ressortgroupref;
2455}
2456
2457/*
2458 * Transform a list of expressions within a GROUP BY clause or grouping set.
2459 *
2460 * The list of expressions belongs to a single clause within which duplicates
2461 * can be safely eliminated.
2462 *
2463 * Returns an integer list of ressortgroupref values.
2464 *
2465 * flatresult reference to flat list of SortGroupClause nodes
2466 * pstate ParseState
2467 * list nodes to transform
2468 * targetlist reference to TargetEntry list
2469 * sortClause ORDER BY clause (SortGroupClause nodes)
2470 * exprKind expression kind
2471 * useSQL99 SQL99 rather than SQL92 syntax
2472 * toplevel false if within any grouping set
2473 */
2474static List *
2476 ParseState *pstate, List *list,
2477 List **targetlist, List *sortClause,
2478 ParseExprKind exprKind, bool useSQL99, bool toplevel)
2479{
2480 Bitmapset *seen_local = NULL;
2481 List *result = NIL;
2482 ListCell *gl;
2483
2484 foreach(gl, list)
2485 {
2486 Node *gexpr = (Node *) lfirst(gl);
2487
2488 Index ref = transformGroupClauseExpr(flatresult,
2489 seen_local,
2490 pstate,
2491 gexpr,
2492 targetlist,
2493 sortClause,
2494 exprKind,
2495 useSQL99,
2496 toplevel);
2497
2498 if (ref > 0)
2499 {
2500 seen_local = bms_add_member(seen_local, ref);
2501 result = lappend_int(result, ref);
2502 }
2503 }
2504
2505 return result;
2506}
2507
2508/*
2509 * Transform a grouping set and (recursively) its content.
2510 *
2511 * The grouping set might be a GROUPING SETS node with other grouping sets
2512 * inside it, but SETS within SETS have already been flattened out before
2513 * reaching here.
2514 *
2515 * Returns the transformed node, which now contains SIMPLE nodes with lists
2516 * of ressortgrouprefs rather than expressions.
2517 *
2518 * flatresult reference to flat list of SortGroupClause nodes
2519 * pstate ParseState
2520 * gset grouping set to transform
2521 * targetlist reference to TargetEntry list
2522 * sortClause ORDER BY clause (SortGroupClause nodes)
2523 * exprKind expression kind
2524 * useSQL99 SQL99 rather than SQL92 syntax
2525 * toplevel false if within any grouping set
2526 */
2527static Node *
2529 ParseState *pstate, GroupingSet *gset,
2530 List **targetlist, List *sortClause,
2531 ParseExprKind exprKind, bool useSQL99, bool toplevel)
2532{
2533 ListCell *gl;
2534 List *content = NIL;
2535
2536 Assert(toplevel || gset->kind != GROUPING_SET_SETS);
2537
2538 foreach(gl, gset->content)
2539 {
2540 Node *n = lfirst(gl);
2541
2542 if (IsA(n, List))
2543 {
2544 List *l = transformGroupClauseList(flatresult,
2545 pstate, (List *) n,
2546 targetlist, sortClause,
2547 exprKind, useSQL99, false);
2548
2549 content = lappend(content, makeGroupingSet(GROUPING_SET_SIMPLE,
2550 l,
2551 exprLocation(n)));
2552 }
2553 else if (IsA(n, GroupingSet))
2554 {
2555 GroupingSet *gset2 = (GroupingSet *) lfirst(gl);
2556
2557 content = lappend(content, transformGroupingSet(flatresult,
2558 pstate, gset2,
2559 targetlist, sortClause,
2560 exprKind, useSQL99, false));
2561 }
2562 else
2563 {
2564 Index ref = transformGroupClauseExpr(flatresult,
2565 NULL,
2566 pstate,
2567 n,
2568 targetlist,
2569 sortClause,
2570 exprKind,
2571 useSQL99,
2572 false);
2573
2574 content = lappend(content, makeGroupingSet(GROUPING_SET_SIMPLE,
2575 list_make1_int(ref),
2576 exprLocation(n)));
2577 }
2578 }
2579
2580 /* Arbitrarily cap the size of CUBE, which has exponential growth */
2581 if (gset->kind == GROUPING_SET_CUBE)
2582 {
2583 if (list_length(content) > 12)
2584 ereport(ERROR,
2585 (errcode(ERRCODE_TOO_MANY_COLUMNS),
2586 errmsg("CUBE is limited to 12 elements"),
2587 parser_errposition(pstate, gset->location)));
2588 }
2589
2590 return (Node *) makeGroupingSet(gset->kind, content, gset->location);
2591}
2592
2593
2594/*
2595 * transformGroupClause -
2596 * transform a GROUP BY clause
2597 *
2598 * GROUP BY items will be added to the targetlist (as resjunk columns)
2599 * if not already present, so the targetlist must be passed by reference.
2600 *
2601 * If GROUP BY ALL is specified, the groupClause will be inferred to be all
2602 * non-aggregate, non-window expressions in the targetlist.
2603 *
2604 * This is also used for window PARTITION BY clauses (which act almost the
2605 * same, but are always interpreted per SQL99 rules).
2606 *
2607 * Grouping sets make this a lot more complex than it was. Our goal here is
2608 * twofold: we make a flat list of SortGroupClause nodes referencing each
2609 * distinct expression used for grouping, with those expressions added to the
2610 * targetlist if needed. At the same time, we build the groupingSets tree,
2611 * which stores only ressortgrouprefs as integer lists inside GroupingSet nodes
2612 * (possibly nested, but limited in depth: a GROUPING_SET_SETS node can contain
2613 * nested SIMPLE, CUBE or ROLLUP nodes, but not more sets - we flatten that
2614 * out; while CUBE and ROLLUP can contain only SIMPLE nodes).
2615 *
2616 * We skip much of the hard work if there are no grouping sets.
2617 *
2618 * One subtlety is that the groupClause list can end up empty while the
2619 * groupingSets list is not; this happens if there are only empty grouping
2620 * sets, or an explicit GROUP BY (). This has the same effect as specifying
2621 * aggregates or a HAVING clause with no GROUP BY; the output is one row per
2622 * grouping set even if the input is empty.
2623 *
2624 * Returns the transformed (flat) groupClause.
2625 *
2626 * pstate ParseState
2627 * grouplist clause to transform
2628 * groupByAll is this a GROUP BY ALL statement?
2629 * groupingSets reference to list to contain the grouping set tree
2630 * targetlist reference to TargetEntry list
2631 * sortClause ORDER BY clause (SortGroupClause nodes)
2632 * exprKind expression kind
2633 * useSQL99 SQL99 rather than SQL92 syntax
2634 */
2635List *
2636transformGroupClause(ParseState *pstate, List *grouplist, bool groupByAll,
2637 List **groupingSets,
2638 List **targetlist, List *sortClause,
2639 ParseExprKind exprKind, bool useSQL99)
2640{
2641 List *result = NIL;
2642 List *flat_grouplist;
2643 List *gsets = NIL;
2644 ListCell *gl;
2645 bool hasGroupingSets = false;
2646 Bitmapset *seen_local = NULL;
2647
2648 /* Handle GROUP BY ALL */
2649 if (groupByAll)
2650 {
2651 /* There cannot have been any explicit grouplist items */
2652 Assert(grouplist == NIL);
2653
2654 /* Iterate over targets, adding acceptable ones to the result list */
2655 foreach_ptr(TargetEntry, tle, *targetlist)
2656 {
2657 /* Ignore junk TLEs */
2658 if (tle->resjunk)
2659 continue;
2660
2661 /*
2662 * TLEs containing aggregates are not okay to add to GROUP BY
2663 * (compare checkTargetlistEntrySQL92). But the SQL standard
2664 * directs us to skip them, so it's fine.
2665 */
2666 if (pstate->p_hasAggs &&
2667 contain_aggs_of_level((Node *) tle->expr, 0))
2668 continue;
2669
2670 /*
2671 * Likewise, TLEs containing window functions are not okay to add
2672 * to GROUP BY. At this writing, the SQL standard is silent on
2673 * what to do with them, but by analogy to aggregates we'll just
2674 * skip them.
2675 */
2676 if (pstate->p_hasWindowFuncs &&
2677 contain_windowfuncs((Node *) tle->expr))
2678 continue;
2679
2680 /*
2681 * Otherwise, add the TLE to the result using default sort/group
2682 * semantics. We specify the parse location as the TLE's
2683 * location, despite the comment for addTargetToGroupList
2684 * discouraging that. The only other thing we could point to is
2685 * the ALL keyword, which seems unhelpful when there are multiple
2686 * TLEs.
2687 */
2688 result = addTargetToGroupList(pstate, tle,
2689 result, *targetlist,
2690 exprLocation((Node *) tle->expr));
2691 }
2692
2693 /* If we found any acceptable targets, we're done */
2694 if (result != NIL)
2695 return result;
2696
2697 /*
2698 * Otherwise, the SQL standard says to treat it like "GROUP BY ()".
2699 * Build a representation of that, and let the rest of this function
2700 * handle it.
2701 */
2703 }
2704
2705 /*
2706 * Recursively flatten implicit RowExprs. (Technically this is only needed
2707 * for GROUP BY, per the syntax rules for grouping sets, but we do it
2708 * anyway.)
2709 */
2710 flat_grouplist = (List *) flatten_grouping_sets((Node *) grouplist,
2711 true,
2712 &hasGroupingSets);
2713
2714 /*
2715 * If the list is now empty, but hasGroupingSets is true, it's because we
2716 * elided redundant empty grouping sets. Restore a single empty grouping
2717 * set to leave a canonical form: GROUP BY ()
2718 */
2719
2720 if (flat_grouplist == NIL && hasGroupingSets)
2721 {
2723 NIL,
2724 exprLocation((Node *) grouplist)));
2725 }
2726
2727 foreach(gl, flat_grouplist)
2728 {
2729 Node *gexpr = (Node *) lfirst(gl);
2730
2731 if (IsA(gexpr, GroupingSet))
2732 {
2733 GroupingSet *gset = (GroupingSet *) gexpr;
2734
2735 switch (gset->kind)
2736 {
2737 case GROUPING_SET_EMPTY:
2738 gsets = lappend(gsets, gset);
2739 break;
2741 /* can't happen */
2742 Assert(false);
2743 break;
2744 case GROUPING_SET_SETS:
2745 case GROUPING_SET_CUBE:
2747 gsets = lappend(gsets,
2748 transformGroupingSet(&result,
2749 pstate, gset,
2750 targetlist, sortClause,
2751 exprKind, useSQL99, true));
2752 break;
2753 }
2754 }
2755 else
2756 {
2757 Index ref = transformGroupClauseExpr(&result, seen_local,
2758 pstate, gexpr,
2759 targetlist, sortClause,
2760 exprKind, useSQL99, true);
2761
2762 if (ref > 0)
2763 {
2764 seen_local = bms_add_member(seen_local, ref);
2765 if (hasGroupingSets)
2766 gsets = lappend(gsets,
2768 list_make1_int(ref),
2769 exprLocation(gexpr)));
2770 }
2771 }
2772 }
2773
2774 /* parser should prevent this */
2775 Assert(gsets == NIL || groupingSets != NULL);
2776
2777 if (groupingSets)
2778 *groupingSets = gsets;
2779
2780 return result;
2781}
2782
2783/*
2784 * transformSortClause -
2785 * transform an ORDER BY clause
2786 *
2787 * ORDER BY items will be added to the targetlist (as resjunk columns)
2788 * if not already present, so the targetlist must be passed by reference.
2789 *
2790 * This is also used for window and aggregate ORDER BY clauses (which act
2791 * almost the same, but are always interpreted per SQL99 rules).
2792 */
2793List *
2795 List *orderlist,
2796 List **targetlist,
2797 ParseExprKind exprKind,
2798 bool useSQL99)
2799{
2800 List *sortlist = NIL;
2801 ListCell *olitem;
2802
2803 foreach(olitem, orderlist)
2804 {
2805 SortBy *sortby = (SortBy *) lfirst(olitem);
2806 TargetEntry *tle;
2807
2808 if (useSQL99)
2809 tle = findTargetlistEntrySQL99(pstate, sortby->node,
2810 targetlist, exprKind);
2811 else
2812 tle = findTargetlistEntrySQL92(pstate, sortby->node,
2813 targetlist, exprKind);
2814
2815 sortlist = addTargetToSortList(pstate, tle,
2816 sortlist, *targetlist, sortby);
2817 }
2818
2819 return sortlist;
2820}
2821
2822/*
2823 * transformWindowDefinitions -
2824 * transform window definitions (WindowDef to WindowClause)
2825 */
2826List *
2828 List *windowdefs,
2829 List **targetlist)
2830{
2831 List *result = NIL;
2832 Index winref = 0;
2833 ListCell *lc;
2834
2835 foreach(lc, windowdefs)
2836 {
2837 WindowDef *windef = (WindowDef *) lfirst(lc);
2838 WindowClause *refwc = NULL;
2839 List *partitionClause;
2840 List *orderClause;
2841 Oid rangeopfamily = InvalidOid;
2842 Oid rangeopcintype = InvalidOid;
2843 WindowClause *wc;
2844
2845 winref++;
2846
2847 /*
2848 * Check for duplicate window names.
2849 */
2850 if (windef->name &&
2851 findWindowClause(result, windef->name) != NULL)
2852 ereport(ERROR,
2853 (errcode(ERRCODE_WINDOWING_ERROR),
2854 errmsg("window \"%s\" is already defined", windef->name),
2855 parser_errposition(pstate, windef->location)));
2856
2857 /*
2858 * If it references a previous window, look that up.
2859 */
2860 if (windef->refname)
2861 {
2862 refwc = findWindowClause(result, windef->refname);
2863 if (refwc == NULL)
2864 ereport(ERROR,
2865 (errcode(ERRCODE_UNDEFINED_OBJECT),
2866 errmsg("window \"%s\" does not exist",
2867 windef->refname),
2868 parser_errposition(pstate, windef->location)));
2869 }
2870
2871 /*
2872 * Transform PARTITION and ORDER specs, if any. These are treated
2873 * almost exactly like top-level GROUP BY and ORDER BY clauses,
2874 * including the special handling of nondefault operator semantics.
2875 */
2876 orderClause = transformSortClause(pstate,
2877 windef->orderClause,
2878 targetlist,
2880 true /* force SQL99 rules */ );
2881 partitionClause = transformGroupClause(pstate,
2882 windef->partitionClause,
2883 false /* not GROUP BY ALL */ ,
2884 NULL,
2885 targetlist,
2886 orderClause,
2888 true /* force SQL99 rules */ );
2889
2890 /*
2891 * And prepare the new WindowClause.
2892 */
2893 wc = makeNode(WindowClause);
2894 wc->name = windef->name;
2895 wc->refname = windef->refname;
2896
2897 /*
2898 * Per spec, a windowdef that references a previous one copies the
2899 * previous partition clause (and mustn't specify its own). It can
2900 * specify its own ordering clause, but only if the previous one had
2901 * none. It always specifies its own frame clause, and the previous
2902 * one must not have a frame clause. Yeah, it's bizarre that each of
2903 * these cases works differently, but SQL:2008 says so; see 7.11
2904 * <window clause> syntax rule 10 and general rule 1. The frame
2905 * clause rule is especially bizarre because it makes "OVER foo"
2906 * different from "OVER (foo)", and requires the latter to throw an
2907 * error if foo has a nondefault frame clause. Well, ours not to
2908 * reason why, but we do go out of our way to throw a useful error
2909 * message for such cases.
2910 */
2911 if (refwc)
2912 {
2913 if (partitionClause)
2914 ereport(ERROR,
2915 (errcode(ERRCODE_WINDOWING_ERROR),
2916 errmsg("cannot override PARTITION BY clause of window \"%s\"",
2917 windef->refname),
2918 parser_errposition(pstate, windef->location)));
2920 }
2921 else
2922 wc->partitionClause = partitionClause;
2923 if (refwc)
2924 {
2925 if (orderClause && refwc->orderClause)
2926 ereport(ERROR,
2927 (errcode(ERRCODE_WINDOWING_ERROR),
2928 errmsg("cannot override ORDER BY clause of window \"%s\"",
2929 windef->refname),
2930 parser_errposition(pstate, windef->location)));
2931 if (orderClause)
2932 {
2933 wc->orderClause = orderClause;
2934 wc->copiedOrder = false;
2935 }
2936 else
2937 {
2938 wc->orderClause = copyObject(refwc->orderClause);
2939 wc->copiedOrder = true;
2940 }
2941 }
2942 else
2943 {
2944 wc->orderClause = orderClause;
2945 wc->copiedOrder = false;
2946 }
2947 if (refwc && refwc->frameOptions != FRAMEOPTION_DEFAULTS)
2948 {
2949 /*
2950 * Use this message if this is a WINDOW clause, or if it's an OVER
2951 * clause that includes ORDER BY or framing clauses. (We already
2952 * rejected PARTITION BY above, so no need to check that.)
2953 */
2954 if (windef->name ||
2955 orderClause || windef->frameOptions != FRAMEOPTION_DEFAULTS)
2956 ereport(ERROR,
2957 (errcode(ERRCODE_WINDOWING_ERROR),
2958 errmsg("cannot copy window \"%s\" because it has a frame clause",
2959 windef->refname),
2960 parser_errposition(pstate, windef->location)));
2961 /* Else this clause is just OVER (foo), so say this: */
2962 ereport(ERROR,
2963 (errcode(ERRCODE_WINDOWING_ERROR),
2964 errmsg("cannot copy window \"%s\" because it has a frame clause",
2965 windef->refname),
2966 errhint("Omit the parentheses in this OVER clause."),
2967 parser_errposition(pstate, windef->location)));
2968 }
2969 wc->frameOptions = windef->frameOptions;
2970
2971 /*
2972 * RANGE offset PRECEDING/FOLLOWING requires exactly one ORDER BY
2973 * column; check that and get its sort opfamily info.
2974 */
2975 if ((wc->frameOptions & FRAMEOPTION_RANGE) &&
2978 {
2979 SortGroupClause *sortcl;
2980 Node *sortkey;
2981 CompareType rangecmptype;
2982
2983 if (list_length(wc->orderClause) != 1)
2984 ereport(ERROR,
2985 (errcode(ERRCODE_WINDOWING_ERROR),
2986 errmsg("RANGE with offset PRECEDING/FOLLOWING requires exactly one ORDER BY column"),
2987 parser_errposition(pstate, windef->location)));
2989 sortkey = get_sortgroupclause_expr(sortcl, *targetlist);
2990 /* Find the sort operator in pg_amop */
2992 &rangeopfamily,
2993 &rangeopcintype,
2994 &rangecmptype))
2995 elog(ERROR, "operator %u is not a valid ordering operator",
2996 sortcl->sortop);
2997 /* Record properties of sort ordering */
2998 wc->inRangeColl = exprCollation(sortkey);
2999 wc->inRangeAsc = !sortcl->reverse_sort;
3000 wc->inRangeNullsFirst = sortcl->nulls_first;
3001 }
3002
3003 /* Per spec, GROUPS mode requires an ORDER BY clause */
3005 {
3006 if (wc->orderClause == NIL)
3007 ereport(ERROR,
3008 (errcode(ERRCODE_WINDOWING_ERROR),
3009 errmsg("GROUPS mode requires an ORDER BY clause"),
3010 parser_errposition(pstate, windef->location)));
3011 }
3012
3013 /* Process frame offset expressions */
3015 rangeopfamily, rangeopcintype,
3016 &wc->startInRangeFunc,
3017 windef->startOffset);
3019 rangeopfamily, rangeopcintype,
3020 &wc->endInRangeFunc,
3021 windef->endOffset);
3022 wc->winref = winref;
3023
3024 result = lappend(result, wc);
3025 }
3026
3027 return result;
3028}
3029
3030/*
3031 * transformDistinctClause -
3032 * transform a DISTINCT clause
3033 *
3034 * Since we may need to add items to the query's targetlist, that list
3035 * is passed by reference.
3036 *
3037 * As with GROUP BY, we absorb the sorting semantics of ORDER BY as much as
3038 * possible into the distinctClause. This avoids a possible need to re-sort,
3039 * and allows the user to choose the equality semantics used by DISTINCT,
3040 * should she be working with a datatype that has more than one equality
3041 * operator.
3042 *
3043 * is_agg is true if we are transforming an aggregate(DISTINCT ...)
3044 * function call. This does not affect any behavior, only the phrasing
3045 * of error messages.
3046 */
3047List *
3049 List **targetlist, List *sortClause, bool is_agg)
3050{
3051 List *result = NIL;
3052 ListCell *slitem;
3053 ListCell *tlitem;
3054
3055 /*
3056 * The distinctClause should consist of all ORDER BY items followed by all
3057 * other non-resjunk targetlist items. There must not be any resjunk
3058 * ORDER BY items --- that would imply that we are sorting by a value that
3059 * isn't necessarily unique within a DISTINCT group, so the results
3060 * wouldn't be well-defined. This construction ensures we follow the rule
3061 * that sortClause and distinctClause match; in fact the sortClause will
3062 * always be a prefix of distinctClause.
3063 *
3064 * Note a corner case: the same TLE could be in the ORDER BY list multiple
3065 * times with different sortops. We have to include it in the
3066 * distinctClause the same way to preserve the prefix property. The net
3067 * effect will be that the TLE value will be made unique according to both
3068 * sortops.
3069 */
3070 foreach(slitem, sortClause)
3071 {
3072 SortGroupClause *scl = (SortGroupClause *) lfirst(slitem);
3073 TargetEntry *tle = get_sortgroupclause_tle(scl, *targetlist);
3074
3075 if (tle->resjunk)
3076 ereport(ERROR,
3077 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
3078 is_agg ?
3079 errmsg("in an aggregate with DISTINCT, ORDER BY expressions must appear in argument list") :
3080 errmsg("for SELECT DISTINCT, ORDER BY expressions must appear in select list"),
3081 parser_errposition(pstate,
3082 exprLocation((Node *) tle->expr))));
3083 result = lappend(result, copyObject(scl));
3084 }
3085
3086 /*
3087 * Now add any remaining non-resjunk tlist items, using default sort/group
3088 * semantics for their data types.
3089 */
3090 foreach(tlitem, *targetlist)
3091 {
3092 TargetEntry *tle = (TargetEntry *) lfirst(tlitem);
3093
3094 if (tle->resjunk)
3095 continue; /* ignore junk */
3096 result = addTargetToGroupList(pstate, tle,
3097 result, *targetlist,
3098 exprLocation((Node *) tle->expr));
3099 }
3100
3101 /*
3102 * Complain if we found nothing to make DISTINCT. Returning an empty list
3103 * would cause the parsed Query to look like it didn't have DISTINCT, with
3104 * results that would probably surprise the user. Note: this case is
3105 * presently impossible for aggregates because of grammar restrictions,
3106 * but we check anyway.
3107 */
3108 if (result == NIL)
3109 ereport(ERROR,
3110 (errcode(ERRCODE_SYNTAX_ERROR),
3111 is_agg ?
3112 errmsg("an aggregate with DISTINCT must have at least one argument") :
3113 errmsg("SELECT DISTINCT must have at least one column")));
3114
3115 return result;
3116}
3117
3118/*
3119 * transformDistinctOnClause -
3120 * transform a DISTINCT ON clause
3121 *
3122 * Since we may need to add items to the query's targetlist, that list
3123 * is passed by reference.
3124 *
3125 * As with GROUP BY, we absorb the sorting semantics of ORDER BY as much as
3126 * possible into the distinctClause. This avoids a possible need to re-sort,
3127 * and allows the user to choose the equality semantics used by DISTINCT,
3128 * should she be working with a datatype that has more than one equality
3129 * operator.
3130 */
3131List *
3133 List **targetlist, List *sortClause)
3134{
3135 List *result = NIL;
3136 List *sortgrouprefs = NIL;
3137 bool skipped_sortitem;
3138 ListCell *lc;
3139 ListCell *lc2;
3140
3141 /*
3142 * Add all the DISTINCT ON expressions to the tlist (if not already
3143 * present, they are added as resjunk items). Assign sortgroupref numbers
3144 * to them, and make a list of these numbers. (NB: we rely below on the
3145 * sortgrouprefs list being one-for-one with the original distinctlist.
3146 * Also notice that we could have duplicate DISTINCT ON expressions and
3147 * hence duplicate entries in sortgrouprefs.)
3148 */
3149 foreach(lc, distinctlist)
3150 {
3151 Node *dexpr = (Node *) lfirst(lc);
3152 int sortgroupref;
3153 TargetEntry *tle;
3154
3155 tle = findTargetlistEntrySQL92(pstate, dexpr, targetlist,
3157 sortgroupref = assignSortGroupRef(tle, *targetlist);
3158 sortgrouprefs = lappend_int(sortgrouprefs, sortgroupref);
3159 }
3160
3161 /*
3162 * If the user writes both DISTINCT ON and ORDER BY, adopt the sorting
3163 * semantics from ORDER BY items that match DISTINCT ON items, and also
3164 * adopt their column sort order. We insist that the distinctClause and
3165 * sortClause match, so throw error if we find the need to add any more
3166 * distinctClause items after we've skipped an ORDER BY item that wasn't
3167 * in DISTINCT ON.
3168 */
3169 skipped_sortitem = false;
3170 foreach(lc, sortClause)
3171 {
3172 SortGroupClause *scl = (SortGroupClause *) lfirst(lc);
3173
3174 if (list_member_int(sortgrouprefs, scl->tleSortGroupRef))
3175 {
3176 if (skipped_sortitem)
3177 ereport(ERROR,
3178 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
3179 errmsg("SELECT DISTINCT ON expressions must match initial ORDER BY expressions"),
3180 parser_errposition(pstate,
3182 sortgrouprefs,
3183 distinctlist))));
3184 else
3185 result = lappend(result, copyObject(scl));
3186 }
3187 else
3188 skipped_sortitem = true;
3189 }
3190
3191 /*
3192 * Now add any remaining DISTINCT ON items, using default sort/group
3193 * semantics for their data types. (Note: this is pretty questionable; if
3194 * the ORDER BY list doesn't include all the DISTINCT ON items and more
3195 * besides, you certainly aren't using DISTINCT ON in the intended way,
3196 * and you probably aren't going to get consistent results. It might be
3197 * better to throw an error or warning here. But historically we've
3198 * allowed it, so keep doing so.)
3199 */
3200 forboth(lc, distinctlist, lc2, sortgrouprefs)
3201 {
3202 Node *dexpr = (Node *) lfirst(lc);
3203 int sortgroupref = lfirst_int(lc2);
3204 TargetEntry *tle = get_sortgroupref_tle(sortgroupref, *targetlist);
3205
3206 if (targetIsInSortList(tle, InvalidOid, result))
3207 continue; /* already in list (with some semantics) */
3208 if (skipped_sortitem)
3209 ereport(ERROR,
3210 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
3211 errmsg("SELECT DISTINCT ON expressions must match initial ORDER BY expressions"),
3212 parser_errposition(pstate, exprLocation(dexpr))));
3213 result = addTargetToGroupList(pstate, tle,
3214 result, *targetlist,
3215 exprLocation(dexpr));
3216 }
3217
3218 /*
3219 * An empty result list is impossible here because of grammar
3220 * restrictions.
3221 */
3222 Assert(result != NIL);
3223
3224 return result;
3225}
3226
3227/*
3228 * get_matching_location
3229 * Get the exprLocation of the exprs member corresponding to the
3230 * (first) member of sortgrouprefs that equals sortgroupref.
3231 *
3232 * This is used so that we can point at a troublesome DISTINCT ON entry.
3233 * (Note that we need to use the original untransformed DISTINCT ON list
3234 * item, as whatever TLE it corresponds to will very possibly have a
3235 * parse location pointing to some matching entry in the SELECT list
3236 * or ORDER BY list.)
3237 */
3238static int
3239get_matching_location(int sortgroupref, List *sortgrouprefs, List *exprs)
3240{
3241 ListCell *lcs;
3242 ListCell *lce;
3243
3244 forboth(lcs, sortgrouprefs, lce, exprs)
3245 {
3246 if (lfirst_int(lcs) == sortgroupref)
3247 return exprLocation((Node *) lfirst(lce));
3248 }
3249 /* if no match, caller blew it */
3250 elog(ERROR, "get_matching_location: no matching sortgroupref");
3251 return -1; /* keep compiler quiet */
3252}
3253
3254/*
3255 * resolve_unique_index_expr
3256 * Infer a unique index from a list of indexElems, for ON
3257 * CONFLICT clause
3258 *
3259 * Perform parse analysis of expressions and columns appearing within ON
3260 * CONFLICT clause. During planning, the returned list of expressions is used
3261 * to infer which unique index to use.
3262 */
3263static List *
3265 Relation heapRel)
3266{
3267 List *result = NIL;
3268 ListCell *l;
3269
3270 foreach(l, infer->indexElems)
3271 {
3272 IndexElem *ielem = (IndexElem *) lfirst(l);
3274 Node *parse;
3275
3276 /*
3277 * Raw grammar re-uses CREATE INDEX infrastructure for unique index
3278 * inference clause, and so will accept opclasses by name and so on.
3279 *
3280 * Make no attempt to match ASC or DESC ordering or NULLS FIRST/NULLS
3281 * LAST ordering, since those are not significant for inference
3282 * purposes (any unique index matching the inference specification in
3283 * other regards is accepted indifferently). Actively reject this as
3284 * wrong-headed.
3285 */
3286 if (ielem->ordering != SORTBY_DEFAULT)
3287 ereport(ERROR,
3288 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
3289 errmsg("ASC/DESC is not allowed in ON CONFLICT clause"),
3290 parser_errposition(pstate,
3291 exprLocation((Node *) infer))));
3293 ereport(ERROR,
3294 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
3295 errmsg("NULLS FIRST/LAST is not allowed in ON CONFLICT clause"),
3296 parser_errposition(pstate,
3297 exprLocation((Node *) infer))));
3298
3299 if (!ielem->expr)
3300 {
3301 /* Simple index attribute */
3302 ColumnRef *n;
3303
3304 /*
3305 * Grammar won't have built raw expression for us in event of
3306 * plain column reference. Create one directly, and perform
3307 * expression transformation. Planner expects this, and performs
3308 * its own normalization for the purposes of matching against
3309 * pg_index.
3310 */
3311 n = makeNode(ColumnRef);
3312 n->fields = list_make1(makeString(ielem->name));
3313 /* Location is approximately that of inference specification */
3314 n->location = infer->location;
3315 parse = (Node *) n;
3316 }
3317 else
3318 {
3319 /* Do parse transformation of the raw expression */
3320 parse = (Node *) ielem->expr;
3321 }
3322
3323 /*
3324 * transformExpr() will reject subqueries, aggregates, window
3325 * functions, and SRFs, based on being passed
3326 * EXPR_KIND_INDEX_EXPRESSION. So we needn't worry about those
3327 * further ... not that they would match any available index
3328 * expression anyway.
3329 */
3331
3332 /* Perform lookup of collation and operator class as required */
3333 if (!ielem->collation)
3334 pInfer->infercollid = InvalidOid;
3335 else
3336 pInfer->infercollid = LookupCollation(pstate, ielem->collation,
3337 exprLocation(pInfer->expr));
3338
3339 if (!ielem->opclass)
3340 pInfer->inferopclass = InvalidOid;
3341 else
3342 pInfer->inferopclass = get_opclass_oid(BTREE_AM_OID,
3343 ielem->opclass, false);
3344
3345 result = lappend(result, pInfer);
3346 }
3347
3348 return result;
3349}
3350
3351/*
3352 * transformOnConflictArbiter -
3353 * transform arbiter expressions in an ON CONFLICT clause.
3354 *
3355 * Transformed expressions used to infer one unique index relation to serve as
3356 * an ON CONFLICT arbiter. Partial unique indexes may be inferred using WHERE
3357 * clause from inference specification clause.
3358 */
3359void
3361 OnConflictClause *onConflictClause,
3362 List **arbiterExpr, Node **arbiterWhere,
3363 Oid *constraint)
3364{
3365 InferClause *infer = onConflictClause->infer;
3366
3367 *arbiterExpr = NIL;
3368 *arbiterWhere = NULL;
3369 *constraint = InvalidOid;
3370
3371 if (onConflictClause->action == ONCONFLICT_UPDATE && !infer)
3372 ereport(ERROR,
3373 (errcode(ERRCODE_SYNTAX_ERROR),
3374 errmsg("ON CONFLICT DO UPDATE requires inference specification or constraint name"),
3375 errhint("For example, ON CONFLICT (column_name)."),
3376 parser_errposition(pstate,
3377 exprLocation((Node *) onConflictClause))));
3378
3379 /*
3380 * To simplify certain aspects of its design, speculative insertion into
3381 * system catalogs is disallowed
3382 */
3384 ereport(ERROR,
3385 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3386 errmsg("ON CONFLICT is not supported with system catalog tables"),
3387 parser_errposition(pstate,
3388 exprLocation((Node *) onConflictClause))));
3389
3390 /* Same applies to table used by logical decoding as catalog table */
3392 ereport(ERROR,
3393 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3394 errmsg("ON CONFLICT is not supported on table \"%s\" used as a catalog table",
3396 parser_errposition(pstate,
3397 exprLocation((Node *) onConflictClause))));
3398
3399 /* ON CONFLICT DO NOTHING does not require an inference clause */
3400 if (infer)
3401 {
3402 if (infer->indexElems)
3403 *arbiterExpr = resolve_unique_index_expr(pstate, infer,
3404 pstate->p_target_relation);
3405
3406 /*
3407 * Handling inference WHERE clause (for partial unique index
3408 * inference)
3409 */
3410 if (infer->whereClause)
3411 *arbiterWhere = transformExpr(pstate, infer->whereClause,
3413
3414 /*
3415 * If the arbiter is specified by constraint name, get the constraint
3416 * OID and mark the constrained columns as requiring SELECT privilege,
3417 * in the same way as would have happened if the arbiter had been
3418 * specified by explicit reference to the constraint's index columns.
3419 */
3420 if (infer->conname)
3421 {
3422 Oid relid = RelationGetRelid(pstate->p_target_relation);
3423 RTEPermissionInfo *perminfo = pstate->p_target_nsitem->p_perminfo;
3424 Bitmapset *conattnos;
3425
3426 conattnos = get_relation_constraint_attnos(relid, infer->conname,
3427 false, constraint);
3428
3429 /* Make sure the rel as a whole is marked for SELECT access */
3430 perminfo->requiredPerms |= ACL_SELECT;
3431 /* Mark the constrained columns as requiring SELECT access */
3432 perminfo->selectedCols = bms_add_members(perminfo->selectedCols,
3433 conattnos);
3434 }
3435 }
3436
3437 /*
3438 * It's convenient to form a list of expressions based on the
3439 * representation used by CREATE INDEX, since the same restrictions are
3440 * appropriate (e.g. on subqueries). However, from here on, a dedicated
3441 * primnode representation is used for inference elements, and so
3442 * assign_query_collations() can be trusted to do the right thing with the
3443 * post parse analysis query tree inference clause representation.
3444 */
3445}
3446
3447/*
3448 * addTargetToSortList
3449 * If the given targetlist entry isn't already in the SortGroupClause
3450 * list, add it to the end of the list, using the given sort ordering
3451 * info.
3452 *
3453 * Returns the updated SortGroupClause list.
3454 */
3455List *
3457 List *sortlist, List *targetlist, SortBy *sortby)
3458{
3459 Oid restype = exprType((Node *) tle->expr);
3460 Oid sortop;
3461 Oid eqop;
3462 bool hashable;
3463 bool reverse;
3464 int location;
3465 ParseCallbackState pcbstate;
3466
3467 /* if tlist item is an UNKNOWN literal, change it to TEXT */
3468 if (restype == UNKNOWNOID)
3469 {
3470 tle->expr = (Expr *) coerce_type(pstate, (Node *) tle->expr,
3471 restype, TEXTOID, -1,
3474 -1);
3475 restype = TEXTOID;
3476 }
3477
3478 /*
3479 * Rather than clutter the API of get_sort_group_operators and the other
3480 * functions we're about to use, make use of error context callback to
3481 * mark any error reports with a parse position. We point to the operator
3482 * location if present, else to the expression being sorted. (NB: use the
3483 * original untransformed expression here; the TLE entry might well point
3484 * at a duplicate expression in the regular SELECT list.)
3485 */
3486 location = sortby->location;
3487 if (location < 0)
3488 location = exprLocation(sortby->node);
3489 setup_parser_errposition_callback(&pcbstate, pstate, location);
3490
3491 /* determine the sortop, eqop, and directionality */
3492 switch (sortby->sortby_dir)
3493 {
3494 case SORTBY_DEFAULT:
3495 case SORTBY_ASC:
3497 true, true, false,
3498 &sortop, &eqop, NULL,
3499 &hashable);
3500 reverse = false;
3501 break;
3502 case SORTBY_DESC:
3504 false, true, true,
3505 NULL, &eqop, &sortop,
3506 &hashable);
3507 reverse = true;
3508 break;
3509 case SORTBY_USING:
3510 Assert(sortby->useOp != NIL);
3511 sortop = compatible_oper_opid(sortby->useOp,
3512 restype,
3513 restype,
3514 false);
3515
3516 /*
3517 * Verify it's a valid ordering operator, fetch the corresponding
3518 * equality operator, and determine whether to consider it like
3519 * ASC or DESC.
3520 */
3521 eqop = get_equality_op_for_ordering_op(sortop, &reverse);
3522 if (!OidIsValid(eqop))
3523 ereport(ERROR,
3524 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3525 errmsg("operator %s is not a valid ordering operator",
3526 strVal(llast(sortby->useOp))),
3527 errhint("Ordering operators must be \"<\" or \">\" members of btree operator families.")));
3528
3529 /*
3530 * Also see if the equality operator is hashable.
3531 */
3532 hashable = op_hashjoinable(eqop, restype);
3533 break;
3534 default:
3535 elog(ERROR, "unrecognized sortby_dir: %d", sortby->sortby_dir);
3536 sortop = InvalidOid; /* keep compiler quiet */
3537 eqop = InvalidOid;
3538 hashable = false;
3539 reverse = false;
3540 break;
3541 }
3542
3544
3545 /* avoid making duplicate sortlist entries */
3546 if (!targetIsInSortList(tle, sortop, sortlist))
3547 {
3549
3550 sortcl->tleSortGroupRef = assignSortGroupRef(tle, targetlist);
3551
3552 sortcl->eqop = eqop;
3553 sortcl->sortop = sortop;
3554 sortcl->hashable = hashable;
3555 sortcl->reverse_sort = reverse;
3556
3557 switch (sortby->sortby_nulls)
3558 {
3560 /* NULLS FIRST is default for DESC; other way for ASC */
3561 sortcl->nulls_first = reverse;
3562 break;
3563 case SORTBY_NULLS_FIRST:
3564 sortcl->nulls_first = true;
3565 break;
3566 case SORTBY_NULLS_LAST:
3567 sortcl->nulls_first = false;
3568 break;
3569 default:
3570 elog(ERROR, "unrecognized sortby_nulls: %d",
3571 sortby->sortby_nulls);
3572 break;
3573 }
3574
3575 sortlist = lappend(sortlist, sortcl);
3576 }
3577
3578 return sortlist;
3579}
3580
3581/*
3582 * addTargetToGroupList
3583 * If the given targetlist entry isn't already in the SortGroupClause
3584 * list, add it to the end of the list, using default sort/group
3585 * semantics.
3586 *
3587 * This is very similar to addTargetToSortList, except that we allow the
3588 * case where only a grouping (equality) operator can be found, and that
3589 * the TLE is considered "already in the list" if it appears there with any
3590 * sorting semantics.
3591 *
3592 * location is the parse location to be fingered in event of trouble. Note
3593 * that we can't rely on exprLocation(tle->expr), because that might point
3594 * to a SELECT item that matches the GROUP BY item; it'd be pretty confusing
3595 * to report such a location.
3596 *
3597 * Returns the updated SortGroupClause list.
3598 */
3599static List *
3601 List *grouplist, List *targetlist, int location)
3602{
3603 Oid restype = exprType((Node *) tle->expr);
3604
3605 /* if tlist item is an UNKNOWN literal, change it to TEXT */
3606 if (restype == UNKNOWNOID)
3607 {
3608 tle->expr = (Expr *) coerce_type(pstate, (Node *) tle->expr,
3609 restype, TEXTOID, -1,
3612 -1);
3613 restype = TEXTOID;
3614 }
3615
3616 /* avoid making duplicate grouplist entries */
3617 if (!targetIsInSortList(tle, InvalidOid, grouplist))
3618 {
3620 Oid sortop;
3621 Oid eqop;
3622 bool hashable;
3623 ParseCallbackState pcbstate;
3624
3625 setup_parser_errposition_callback(&pcbstate, pstate, location);
3626
3627 /* determine the eqop and optional sortop */
3629 false, true, false,
3630 &sortop, &eqop, NULL,
3631 &hashable);
3632
3634
3635 grpcl->tleSortGroupRef = assignSortGroupRef(tle, targetlist);
3636 grpcl->eqop = eqop;
3637 grpcl->sortop = sortop;
3638 grpcl->reverse_sort = false; /* sortop is "less than", or
3639 * InvalidOid */
3640 grpcl->nulls_first = false; /* OK with or without sortop */
3641 grpcl->hashable = hashable;
3642
3643 grouplist = lappend(grouplist, grpcl);
3644 }
3645
3646 return grouplist;
3647}
3648
3649/*
3650 * assignSortGroupRef
3651 * Assign the targetentry an unused ressortgroupref, if it doesn't
3652 * already have one. Return the assigned or pre-existing refnumber.
3653 *
3654 * 'tlist' is the targetlist containing (or to contain) the given targetentry.
3655 */
3656Index
3658{
3659 Index maxRef;
3660 ListCell *l;
3661
3662 if (tle->ressortgroupref) /* already has one? */
3663 return tle->ressortgroupref;
3664
3665 /* easiest way to pick an unused refnumber: max used + 1 */
3666 maxRef = 0;
3667 foreach(l, tlist)
3668 {
3669 Index ref = ((TargetEntry *) lfirst(l))->ressortgroupref;
3670
3671 if (ref > maxRef)
3672 maxRef = ref;
3673 }
3674 tle->ressortgroupref = maxRef + 1;
3675 return tle->ressortgroupref;
3676}
3677
3678/*
3679 * targetIsInSortList
3680 * Is the given target item already in the sortlist?
3681 * If sortop is not InvalidOid, also test for a match to the sortop.
3682 *
3683 * It is not an oversight that this function ignores the nulls_first flag.
3684 * We check sortop when determining if an ORDER BY item is redundant with
3685 * earlier ORDER BY items, because it's conceivable that "ORDER BY
3686 * foo USING <, foo USING <<<" is not redundant, if <<< distinguishes
3687 * values that < considers equal. We need not check nulls_first
3688 * however, because a lower-order column with the same sortop but
3689 * opposite nulls direction is redundant. Also, we can consider
3690 * ORDER BY foo ASC, foo DESC redundant, so check for a commutator match.
3691 *
3692 * Works for both ordering and grouping lists (sortop would normally be
3693 * InvalidOid when considering grouping). Note that the main reason we need
3694 * this routine (and not just a quick test for nonzeroness of ressortgroupref)
3695 * is that a TLE might be in only one of the lists.
3696 */
3697bool
3698targetIsInSortList(TargetEntry *tle, Oid sortop, List *sortList)
3699{
3700 Index ref = tle->ressortgroupref;
3701 ListCell *l;
3702
3703 /* no need to scan list if tle has no marker */
3704 if (ref == 0)
3705 return false;
3706
3707 foreach(l, sortList)
3708 {
3710
3711 if (scl->tleSortGroupRef == ref &&
3712 (sortop == InvalidOid ||
3713 sortop == scl->sortop ||
3714 sortop == get_commutator(scl->sortop)))
3715 return true;
3716 }
3717 return false;
3718}
3719
3720/*
3721 * findWindowClause
3722 * Find the named WindowClause in the list, or return NULL if not there
3723 */
3724static WindowClause *
3725findWindowClause(List *wclist, const char *name)
3726{
3727 ListCell *l;
3728
3729 foreach(l, wclist)
3730 {
3731 WindowClause *wc = (WindowClause *) lfirst(l);
3732
3733 if (wc->name && strcmp(wc->name, name) == 0)
3734 return wc;
3735 }
3736
3737 return NULL;
3738}
3739
3740/*
3741 * transformFrameOffset
3742 * Process a window frame offset expression
3743 *
3744 * In RANGE mode, rangeopfamily is the sort opfamily for the input ORDER BY
3745 * column, and rangeopcintype is the input data type the sort operator is
3746 * registered with. We expect the in_range function to be registered with
3747 * that same type. (In binary-compatible cases, it might be different from
3748 * the input column's actual type, so we can't use that for the lookups.)
3749 * We'll return the OID of the in_range function to *inRangeFunc.
3750 */
3751static Node *
3752transformFrameOffset(ParseState *pstate, int frameOptions,
3753 Oid rangeopfamily, Oid rangeopcintype, Oid *inRangeFunc,
3754 Node *clause)
3755{
3756 const char *constructName = NULL;
3757 Node *node;
3758
3759 *inRangeFunc = InvalidOid; /* default result */
3760
3761 /* Quick exit if no offset expression */
3762 if (clause == NULL)
3763 return NULL;
3764
3765 if (frameOptions & FRAMEOPTION_ROWS)
3766 {
3767 /* Transform the raw expression tree */
3768 node = transformExpr(pstate, clause, EXPR_KIND_WINDOW_FRAME_ROWS);
3769
3770 /*
3771 * Like LIMIT clause, simply coerce to int8
3772 */
3773 constructName = "ROWS";
3774 node = coerce_to_specific_type(pstate, node, INT8OID, constructName);
3775 }
3776 else if (frameOptions & FRAMEOPTION_RANGE)
3777 {
3778 /*
3779 * We must look up the in_range support function that's to be used,
3780 * possibly choosing one of several, and coerce the "offset" value to
3781 * the appropriate input type.
3782 */
3783 Oid nodeType;
3784 Oid preferredType;
3785 int nfuncs = 0;
3786 int nmatches = 0;
3787 Oid selectedType = InvalidOid;
3788 Oid selectedFunc = InvalidOid;
3789 CatCList *proclist;
3790 int i;
3791
3792 /* Transform the raw expression tree */
3793 node = transformExpr(pstate, clause, EXPR_KIND_WINDOW_FRAME_RANGE);
3794 nodeType = exprType(node);
3795
3796 /*
3797 * If there are multiple candidates, we'll prefer the one that exactly
3798 * matches nodeType; or if nodeType is as yet unknown, prefer the one
3799 * that exactly matches the sort column type. (The second rule is
3800 * like what we do for "known_type operator unknown".)
3801 */
3802 preferredType = (nodeType != UNKNOWNOID) ? nodeType : rangeopcintype;
3803
3804 /* Find the in_range support functions applicable to this case */
3805 proclist = SearchSysCacheList2(AMPROCNUM,
3806 ObjectIdGetDatum(rangeopfamily),
3807 ObjectIdGetDatum(rangeopcintype));
3808 for (i = 0; i < proclist->n_members; i++)
3809 {
3810 HeapTuple proctup = &proclist->members[i]->tuple;
3811 Form_pg_amproc procform = (Form_pg_amproc) GETSTRUCT(proctup);
3812
3813 /* The search will find all support proc types; ignore others */
3814 if (procform->amprocnum != BTINRANGE_PROC)
3815 continue;
3816 nfuncs++;
3817
3818 /* Ignore function if given value can't be coerced to that type */
3819 if (!can_coerce_type(1, &nodeType, &procform->amprocrighttype,
3821 continue;
3822 nmatches++;
3823
3824 /* Remember preferred match, or any match if didn't find that */
3825 if (selectedType != preferredType)
3826 {
3827 selectedType = procform->amprocrighttype;
3828 selectedFunc = procform->amproc;
3829 }
3830 }
3831 ReleaseCatCacheList(proclist);
3832
3833 /*
3834 * Throw error if needed. It seems worth taking the trouble to
3835 * distinguish "no support at all" from "you didn't match any
3836 * available offset type".
3837 */
3838 if (nfuncs == 0)
3839 ereport(ERROR,
3840 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3841 errmsg("RANGE with offset PRECEDING/FOLLOWING is not supported for column type %s",
3842 format_type_be(rangeopcintype)),
3843 parser_errposition(pstate, exprLocation(node))));
3844 if (nmatches == 0)
3845 ereport(ERROR,
3846 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3847 errmsg("RANGE with offset PRECEDING/FOLLOWING is not supported for column type %s and offset type %s",
3848 format_type_be(rangeopcintype),
3849 format_type_be(nodeType)),
3850 errhint("Cast the offset value to an appropriate type."),
3851 parser_errposition(pstate, exprLocation(node))));
3852 if (nmatches != 1 && selectedType != preferredType)
3853 ereport(ERROR,
3854 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3855 errmsg("RANGE with offset PRECEDING/FOLLOWING has multiple interpretations for column type %s and offset type %s",
3856 format_type_be(rangeopcintype),
3857 format_type_be(nodeType)),
3858 errhint("Cast the offset value to the exact intended type."),
3859 parser_errposition(pstate, exprLocation(node))));
3860
3861 /* OK, coerce the offset to the right type */
3862 constructName = "RANGE";
3863 node = coerce_to_specific_type(pstate, node,
3864 selectedType, constructName);
3865 *inRangeFunc = selectedFunc;
3866 }
3867 else if (frameOptions & FRAMEOPTION_GROUPS)
3868 {
3869 /* Transform the raw expression tree */
3870 node = transformExpr(pstate, clause, EXPR_KIND_WINDOW_FRAME_GROUPS);
3871
3872 /*
3873 * Like LIMIT clause, simply coerce to int8
3874 */
3875 constructName = "GROUPS";
3876 node = coerce_to_specific_type(pstate, node, INT8OID, constructName);
3877 }
3878 else
3879 {
3880 Assert(false);
3881 node = NULL;
3882 }
3883
3884 /* Disallow variables in frame offsets */
3885 checkExprIsVarFree(pstate, node, constructName);
3886
3887 return node;
3888}
bool bms_is_member(int x, const Bitmapset *a)
Definition: bitmapset.c:510
Bitmapset * bms_add_member(Bitmapset *a, int x)
Definition: bitmapset.c:815
Bitmapset * bms_add_members(Bitmapset *a, const Bitmapset *b)
Definition: bitmapset.c:917
int32_t int32
Definition: c.h:534
unsigned int Index
Definition: c.h:619
#define OidIsValid(objectId)
Definition: c.h:774
bool IsCatalogRelation(Relation relation)
Definition: catalog.c:104
void ReleaseCatCacheList(CatCList *list)
Definition: catcache.c:2094
CompareType
Definition: cmptype.h:32
int errmsg_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...)
Definition: elog.c:1193
int errhint(const char *fmt,...)
Definition: elog.c:1330
int errcode(int sqlerrcode)
Definition: elog.c:863
int errmsg(const char *fmt,...)
Definition: elog.c:1080
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:226
#define ereport(elevel,...)
Definition: elog.h:150
bool equal(const void *a, const void *b)
Definition: equalfuncs.c:223
char * format_type_be(Oid type_oid)
Definition: format_type.c:343
Assert(PointerIsAligned(start, uint64))
static void * GETSTRUCT(const HeapTupleData *tuple)
Definition: htup_details.h:728
int j
Definition: isn.c:78
int i
Definition: isn.c:77
List * lappend(List *list, void *datum)
Definition: list.c:339
List * list_concat(List *list1, const List *list2)
Definition: list.c:561
List * lappend_int(List *list, int datum)
Definition: list.c:357
List * lappend_oid(List *list, Oid datum)
Definition: list.c:375
bool list_member_int(const List *list, int datum)
Definition: list.c:702
List * list_truncate(List *list, int new_size)
Definition: list.c:631
#define NoLock
Definition: lockdefs.h:34
#define RowExclusiveLock
Definition: lockdefs.h:38
bool get_ordering_op_properties(Oid opno, Oid *opfamily, Oid *opcintype, CompareType *cmptype)
Definition: lsyscache.c:266
Oid get_equality_op_for_ordering_op(Oid opno, bool *reverse)
Definition: lsyscache.c:331
bool op_hashjoinable(Oid opno, Oid inputtype)
Definition: lsyscache.c:1604
Oid get_typcollation(Oid typid)
Definition: lsyscache.c:3223
Oid get_func_rettype(Oid funcid)
Definition: lsyscache.c:1822
Oid get_commutator(Oid opno)
Definition: lsyscache.c:1676
Expr * makeBoolExpr(BoolExprType boolop, List *args, int location)
Definition: makefuncs.c:420
A_Expr * makeSimpleA_Expr(A_Expr_Kind kind, char *name, Node *lexpr, Node *rexpr, int location)
Definition: makefuncs.c:48
Var * makeVar(int varno, AttrNumber varattno, Oid vartype, int32 vartypmod, Oid varcollid, Index varlevelsup)
Definition: makefuncs.c:66
RelabelType * makeRelabelType(Expr *arg, Oid rtype, int32 rtypmod, Oid rcollid, CoercionForm rformat)
Definition: makefuncs.c:453
FuncCall * makeFuncCall(List *name, List *args, CoercionForm funcformat, int location)
Definition: makefuncs.c:676
GroupingSet * makeGroupingSet(GroupingSetKind kind, List *content, int location)
Definition: makefuncs.c:892
char * pstrdup(const char *in)
Definition: mcxt.c:1759
void pfree(void *pointer)
Definition: mcxt.c:1594
void * palloc0(Size size)
Definition: mcxt.c:1395
void * palloc(Size size)
Definition: mcxt.c:1365
char * NameListToString(const List *names)
Definition: namespace.c:3664
#define BTINRANGE_PROC
Definition: nbtree.h:719
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int32 exprTypmod(const Node *expr)
Definition: nodeFuncs.c:301
Oid exprCollation(const Node *expr)
Definition: nodeFuncs.c:821
Node * strip_implicit_coercions(Node *node)
Definition: nodeFuncs.c:705
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1384
#define IsA(nodeptr, _type_)
Definition: nodes.h:164
#define copyObject(obj)
Definition: nodes.h:232
#define nodeTag(nodeptr)
Definition: nodes.h:139
@ ONCONFLICT_UPDATE
Definition: nodes.h:430
@ CMD_SELECT
Definition: nodes.h:275
LimitOption
Definition: nodes.h:440
@ LIMIT_OPTION_WITH_TIES
Definition: nodes.h:442
#define makeNode(_type_)
Definition: nodes.h:161
#define castNode(_type_, nodeptr)
Definition: nodes.h:182
JoinType
Definition: nodes.h:298
@ JOIN_FULL
Definition: nodes.h:305
@ JOIN_INNER
Definition: nodes.h:303
@ JOIN_RIGHT
Definition: nodes.h:306
@ JOIN_LEFT
Definition: nodes.h:304
Oid get_opclass_oid(Oid amID, List *opclassname, bool missing_ok)
Definition: opclasscmds.c:220
Index assignSortGroupRef(TargetEntry *tle, List *tlist)
static List * transformGroupClauseList(List **flatresult, ParseState *pstate, List *list, List **targetlist, List *sortClause, ParseExprKind exprKind, bool useSQL99, bool toplevel)
Node * transformWhereClause(ParseState *pstate, Node *clause, ParseExprKind exprKind, const char *constructName)
static Node * transformJoinOnClause(ParseState *pstate, JoinExpr *j, List *namespace)
Definition: parse_clause.c:365
static int extractRemainingColumns(ParseState *pstate, ParseNamespaceColumn *src_nscolumns, List *src_colnames, List **src_colnos, List **res_colnames, List **res_colvars, ParseNamespaceColumn *res_nscolumns)
Definition: parse_clause.c:253
static void setNamespaceLateralState(List *namespace, bool lateral_only, bool lateral_ok)
static Node * flatten_grouping_sets(Node *expr, bool toplevel, bool *hasGroupingSets)
static void markRelsAsNulledBy(ParseState *pstate, Node *n, int jindex)
List * transformGroupClause(ParseState *pstate, List *grouplist, bool groupByAll, List **groupingSets, List **targetlist, List *sortClause, ParseExprKind exprKind, bool useSQL99)
static void checkExprIsVarFree(ParseState *pstate, Node *n, const char *constructName)
static ParseNamespaceItem * transformRangeSubselect(ParseState *pstate, RangeSubselect *r)
Definition: parse_clause.c:405
List * transformSortClause(ParseState *pstate, List *orderlist, List **targetlist, ParseExprKind exprKind, bool useSQL99)
List * transformDistinctOnClause(ParseState *pstate, List *distinctlist, List **targetlist, List *sortClause)
static Var * buildVarFromNSColumn(ParseState *pstate, ParseNamespaceColumn *nscol)
static ParseNamespaceItem * transformRangeTableFunc(ParseState *pstate, RangeTableFunc *rtf)
Definition: parse_clause.c:686
List * transformWindowDefinitions(ParseState *pstate, List *windowdefs, List **targetlist)
static void setNamespaceColumnVisibility(List *namespace, bool cols_visible)
static int get_matching_location(int sortgroupref, List *sortgrouprefs, List *exprs)
void transformFromClause(ParseState *pstate, List *frmList)
Definition: parse_clause.c:112
static ParseNamespaceItem * getNSItemForSpecialRelationTypes(ParseState *pstate, RangeVar *rv)
static void checkTargetlistEntrySQL92(ParseState *pstate, TargetEntry *tle, ParseExprKind exprKind)
static Index transformGroupClauseExpr(List **flatresult, Bitmapset *seen_local, ParseState *pstate, Node *gexpr, List **targetlist, List *sortClause, ParseExprKind exprKind, bool useSQL99, bool toplevel)
static TableSampleClause * transformRangeTableSample(ParseState *pstate, RangeTableSample *rts)
Definition: parse_clause.c:908
static TargetEntry * findTargetlistEntrySQL99(ParseState *pstate, Node *node, List **tlist, ParseExprKind exprKind)
List * transformDistinctClause(ParseState *pstate, List **targetlist, List *sortClause, bool is_agg)
bool targetIsInSortList(TargetEntry *tle, Oid sortop, List *sortList)
Node * transformLimitClause(ParseState *pstate, Node *clause, ParseExprKind exprKind, const char *constructName, LimitOption limitOption)
static List * addTargetToGroupList(ParseState *pstate, TargetEntry *tle, List *grouplist, List *targetlist, int location)
static Node * transformFrameOffset(ParseState *pstate, int frameOptions, Oid rangeopfamily, Oid rangeopcintype, Oid *inRangeFunc, Node *clause)
static Node * transformGroupingSet(List **flatresult, ParseState *pstate, GroupingSet *gset, List **targetlist, List *sortClause, ParseExprKind exprKind, bool useSQL99, bool toplevel)
static List * resolve_unique_index_expr(ParseState *pstate, InferClause *infer, Relation heapRel)
void transformOnConflictArbiter(ParseState *pstate, OnConflictClause *onConflictClause, List **arbiterExpr, Node **arbiterWhere, Oid *constraint)
static Node * transformJoinUsingClause(ParseState *pstate, List *leftVars, List *rightVars)
Definition: parse_clause.c:306
int setTargetTable(ParseState *pstate, RangeVar *relation, bool inh, bool alsoSource, AclMode requiredPerms)
Definition: parse_clause.c:178
static Node * buildMergedJoinVar(ParseState *pstate, JoinType jointype, Var *l_colvar, Var *r_colvar)
static Node * transformFromClauseItem(ParseState *pstate, Node *n, ParseNamespaceItem **top_nsitem, List **namespace)
static ParseNamespaceItem * transformTableEntry(ParseState *pstate, RangeVar *r)
Definition: parse_clause.c:395
static TargetEntry * findTargetlistEntrySQL92(ParseState *pstate, Node *node, List **tlist, ParseExprKind exprKind)
static WindowClause * findWindowClause(List *wclist, const char *name)
List * addTargetToSortList(ParseState *pstate, TargetEntry *tle, List *sortlist, List *targetlist, SortBy *sortby)
static ParseNamespaceItem * transformRangeFunction(ParseState *pstate, RangeFunction *r)
Definition: parse_clause.c:463
Node * coerce_to_specific_type_typmod(ParseState *pstate, Node *node, Oid targetTypeId, int32 targetTypmod, const char *constructName)
int32 select_common_typmod(ParseState *pstate, List *exprs, Oid common_type)
Node * coerce_to_specific_type(ParseState *pstate, Node *node, Oid targetTypeId, const char *constructName)
Node * coerce_type(ParseState *pstate, Node *node, Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod, CoercionContext ccontext, CoercionForm cformat, int location)
Definition: parse_coerce.c:158
Node * coerce_to_boolean(ParseState *pstate, Node *node, const char *constructName)
Oid select_common_type(ParseState *pstate, List *exprs, const char *context, Node **which_expr)
bool can_coerce_type(int nargs, const Oid *input_typeids, const Oid *target_typeids, CoercionContext ccontext)
Definition: parse_coerce.c:558
void assign_list_collations(ParseState *pstate, List *exprs)
void assign_expr_collations(ParseState *pstate, Node *expr)
Node * transformExpr(ParseState *pstate, Node *expr, ParseExprKind exprKind)
Definition: parse_expr.c:119
const char * ParseExprKindName(ParseExprKind exprKind)
Definition: parse_expr.c:3134
Oid LookupFuncName(List *funcname, int nargs, const Oid *argtypes, bool missing_ok)
Definition: parse_func.c:2269
ParseNamespaceItem * transformJsonTable(ParseState *pstate, JsonTable *jt)
void cancel_parser_errposition_callback(ParseCallbackState *pcbstate)
Definition: parse_node.c:156
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:106
void setup_parser_errposition_callback(ParseCallbackState *pcbstate, ParseState *pstate, int location)
Definition: parse_node.c:140
ParseExprKind
Definition: parse_node.h:39
@ EXPR_KIND_DISTINCT_ON
Definition: parse_node.h:61
@ EXPR_KIND_INDEX_EXPRESSION
Definition: parse_node.h:72
@ EXPR_KIND_WINDOW_FRAME_RANGE
Definition: parse_node.h:51
@ EXPR_KIND_FROM_SUBSELECT
Definition: parse_node.h:44
@ EXPR_KIND_WINDOW_FRAME_GROUPS
Definition: parse_node.h:53
@ EXPR_KIND_JOIN_USING
Definition: parse_node.h:43
@ EXPR_KIND_INDEX_PREDICATE
Definition: parse_node.h:73
@ EXPR_KIND_ORDER_BY
Definition: parse_node.h:60
@ EXPR_KIND_JOIN_ON
Definition: parse_node.h:42
@ EXPR_KIND_LIMIT
Definition: parse_node.h:62
@ EXPR_KIND_NONE
Definition: parse_node.h:40
@ EXPR_KIND_GROUP_BY
Definition: parse_node.h:59
@ EXPR_KIND_FROM_FUNCTION
Definition: parse_node.h:45
@ EXPR_KIND_WINDOW_PARTITION
Definition: parse_node.h:49
@ EXPR_KIND_WINDOW_FRAME_ROWS
Definition: parse_node.h:52
@ EXPR_KIND_WINDOW_ORDER
Definition: parse_node.h:50
struct ParseNamespaceColumn ParseNamespaceColumn
Definition: parse_node.h:25
void get_sort_group_operators(Oid argtype, bool needLT, bool needEQ, bool needGT, Oid *ltOpr, Oid *eqOpr, Oid *gtOpr, bool *isHashable)
Definition: parse_oper.c:181
Oid compatible_oper_opid(List *op, Oid arg1, Oid arg2, bool noError)
Definition: parse_oper.c:490
void markNullableIfNeeded(ParseState *pstate, Var *var)
CommonTableExpr * scanNameSpaceForCTE(ParseState *pstate, const char *refname, Index *ctelevelsup)
Node * colNameToVar(ParseState *pstate, const char *colname, bool localonly, int location)
ParseNamespaceItem * addRangeTableEntryForRelation(ParseState *pstate, Relation rel, int lockmode, Alias *alias, bool inh, bool inFromCl)
ParseNamespaceItem * addRangeTableEntryForENR(ParseState *pstate, RangeVar *rv, bool inFromCl)
void markVarForSelectPriv(ParseState *pstate, Var *var)
ParseNamespaceItem * addRangeTableEntry(ParseState *pstate, RangeVar *relation, Alias *alias, bool inh, bool inFromCl)
ParseNamespaceItem * addRangeTableEntryForTableFunc(ParseState *pstate, TableFunc *tf, Alias *alias, bool lateral, bool inFromCl)
Relation parserOpenTable(ParseState *pstate, const RangeVar *relation, int lockmode)
void addNSItemToQuery(ParseState *pstate, ParseNamespaceItem *nsitem, bool addToJoinList, bool addToRelNameSpace, bool addToVarNameSpace)
bool scanNameSpaceForENR(ParseState *pstate, const char *refname)
ParseNamespaceItem * addRangeTableEntryForFunction(ParseState *pstate, List *funcnames, List *funcexprs, List *coldeflists, RangeFunction *rangefunc, bool lateral, bool inFromCl)
bool isLockedRefname(ParseState *pstate, const char *refname)
ParseNamespaceItem * addRangeTableEntryForSubquery(ParseState *pstate, Query *subquery, Alias *alias, bool lateral, bool inFromCl)
ParseNamespaceItem * addRangeTableEntryForCTE(ParseState *pstate, CommonTableExpr *cte, Index levelsup, RangeVar *rv, bool inFromCl)
ParseNamespaceItem * addRangeTableEntryForJoin(ParseState *pstate, List *colnames, ParseNamespaceColumn *nscolumns, JoinType jointype, int nummergedcols, List *aliasvars, List *leftcols, List *rightcols, Alias *join_using_alias, Alias *alias, bool inFromCl)
void checkNameSpaceConflicts(ParseState *pstate, List *namespace1, List *namespace2)
TargetEntry * transformTargetEntry(ParseState *pstate, Node *node, Node *expr, ParseExprKind exprKind, char *colname, bool resjunk)
Definition: parse_target.c:74
char * FigureColname(Node *node)
Oid LookupCollation(ParseState *pstate, List *collnames, int location)
Definition: parse_type.c:515
void typenameTypeIdAndMod(ParseState *pstate, const TypeName *typeName, Oid *typeid_p, int32 *typmod_p)
Definition: parse_type.c:310
#define FRAMEOPTION_END_OFFSET
Definition: parsenodes.h:630
@ SORTBY_NULLS_DEFAULT
Definition: parsenodes.h:54
@ SORTBY_NULLS_LAST
Definition: parsenodes.h:56
@ SORTBY_NULLS_FIRST
Definition: parsenodes.h:55
@ GROUPING_SET_CUBE
Definition: parsenodes.h:1533
@ GROUPING_SET_SIMPLE
Definition: parsenodes.h:1531
@ GROUPING_SET_ROLLUP
Definition: parsenodes.h:1532
@ GROUPING_SET_SETS
Definition: parsenodes.h:1534
@ GROUPING_SET_EMPTY
Definition: parsenodes.h:1530
uint64 AclMode
Definition: parsenodes.h:74
@ AEXPR_OP
Definition: parsenodes.h:330
@ RTE_RELATION
Definition: parsenodes.h:1043
#define FRAMEOPTION_START_OFFSET
Definition: parsenodes.h:628
#define FRAMEOPTION_RANGE
Definition: parsenodes.h:610
#define ACL_SELECT
Definition: parsenodes.h:77
#define FRAMEOPTION_GROUPS
Definition: parsenodes.h:612
#define FRAMEOPTION_DEFAULTS
Definition: parsenodes.h:636
@ SORTBY_USING
Definition: parsenodes.h:49
@ SORTBY_DESC
Definition: parsenodes.h:48
@ SORTBY_ASC
Definition: parsenodes.h:47
@ SORTBY_DEFAULT
Definition: parsenodes.h:46
#define FRAMEOPTION_ROWS
Definition: parsenodes.h:611
Query * parse_sub_analyze(Node *parseTree, ParseState *parentParseState, CommonTableExpr *parentCTE, bool locked_from_parent, bool resolve_unknowns)
Definition: analyze.c:233
List * SystemFuncName(char *name)
FormData_pg_amproc * Form_pg_amproc
Definition: pg_amproc.h:68
int16 attnum
Definition: pg_attribute.h:74
void * arg
Bitmapset * get_relation_constraint_attnos(Oid relid, const char *conname, bool missing_ok, Oid *constraintOid)
#define lfirst(lc)
Definition: pg_list.h:172
#define llast(l)
Definition: pg_list.h:198
#define lfirst_node(type, lc)
Definition: pg_list.h:176
static int list_length(const List *l)
Definition: pg_list.h:152
#define linitial_node(type, l)
Definition: pg_list.h:181
#define NIL
Definition: pg_list.h:68
#define forboth(cell1, list1, cell2, list2)
Definition: pg_list.h:518
#define lfirst_int(lc)
Definition: pg_list.h:173
#define list_make1(x1)
Definition: pg_list.h:212
#define foreach_ptr(type, var, lst)
Definition: pg_list.h:469
#define linitial(l)
Definition: pg_list.h:178
static ListCell * list_nth_cell(const List *list, int n)
Definition: pg_list.h:277
#define lsecond(l)
Definition: pg_list.h:183
#define list_make1_int(x1)
Definition: pg_list.h:227
#define lfirst_oid(lc)
Definition: pg_list.h:174
#define list_make2(x1, x2)
Definition: pg_list.h:214
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:262
#define InvalidOid
Definition: postgres_ext.h:37
unsigned int Oid
Definition: postgres_ext.h:32
char * c
e
Definition: preproc-init.c:82
static int fc(const char *x)
Definition: preproc-init.c:99
@ TFT_XMLTABLE
Definition: primnodes.h:100
@ AND_EXPR
Definition: primnodes.h:963
@ VAR_RETURNING_DEFAULT
Definition: primnodes.h:256
@ COERCE_IMPLICIT_CAST
Definition: primnodes.h:768
@ COERCE_EXPLICIT_CALL
Definition: primnodes.h:766
@ COERCION_IMPLICIT
Definition: primnodes.h:746
static struct subre * parse(struct vars *v, int stopper, int type, struct state *init, struct state *final)
Definition: regcomp.c:717
#define RelationGetRelid(relation)
Definition: rel.h:515
#define RelationIsUsedAsCatalogTable(relation)
Definition: rel.h:398
#define RelationGetRelationName(relation)
Definition: rel.h:549
bool contain_windowfuncs(Node *node)
Definition: rewriteManip.c:214
int locate_agg_of_level(Node *node, int levelsup)
Definition: rewriteManip.c:149
bool contain_aggs_of_level(Node *node, int levelsup)
Definition: rewriteManip.c:85
int locate_windowfunc(Node *node)
Definition: rewriteManip.c:251
void check_stack_depth(void)
Definition: stack_depth.c:95
union ValUnion val
Definition: parsenodes.h:387
ParseLoc location
Definition: parsenodes.h:389
char * aliasname
Definition: primnodes.h:51
List * colnames
Definition: primnodes.h:52
ParseLoc location
Definition: parsenodes.h:312
List * fields
Definition: parsenodes.h:311
List * content
Definition: parsenodes.h:1541
ParseLoc location
Definition: parsenodes.h:1542
Node * expr
Definition: parsenodes.h:812
SortByDir ordering
Definition: parsenodes.h:817
SortByNulls nulls_ordering
Definition: parsenodes.h:818
List * opclass
Definition: parsenodes.h:815
char * name
Definition: parsenodes.h:811
List * collation
Definition: parsenodes.h:814
char * conname
Definition: parsenodes.h:1642
List * indexElems
Definition: parsenodes.h:1640
Node * whereClause
Definition: parsenodes.h:1641
Definition: value.h:29
Definition: pg_list.h:54
Definition: nodes.h:135
NodeTag type
Definition: nodes.h:136
InferClause * infer
Definition: parsenodes.h:1656
OnConflictAction action
Definition: parsenodes.h:1655
VarReturningType p_varreturningtype
Definition: parse_node.h:335
AttrNumber p_varattno
Definition: parse_node.h:331
AttrNumber p_varattnosyn
Definition: parse_node.h:337
RangeTblEntry * p_rte
Definition: parse_node.h:295
ParseNamespaceColumn * p_nscolumns
Definition: parse_node.h:299
RTEPermissionInfo * p_perminfo
Definition: parse_node.h:297
VarReturningType p_returning_type
Definition: parse_node.h:304
bool p_hasWindowFuncs
Definition: parse_node.h:227
ParseNamespaceItem * p_target_nsitem
Definition: parse_node.h:210
ParseExprKind p_expr_kind
Definition: parse_node.h:214
List * p_nullingrels
Definition: parse_node.h:200
List * p_namespace
Definition: parse_node.h:203
List * p_joinexprs
Definition: parse_node.h:199
Relation p_target_relation
Definition: parse_node.h:209
Node * p_last_srf
Definition: parse_node.h:232
List * p_joinlist
Definition: parse_node.h:201
bool p_lateral_active
Definition: parse_node.h:205
List * p_rtable
Definition: parse_node.h:196
bool p_hasAggs
Definition: parse_node.h:226
CmdType commandType
Definition: parsenodes.h:121
Bitmapset * selectedCols
Definition: parsenodes.h:1324
AclMode requiredPerms
Definition: parsenodes.h:1322
bool is_rowsfrom
Definition: parsenodes.h:670
List * coldeflist
Definition: parsenodes.h:673
List * functions
Definition: parsenodes.h:671
Node * subquery
Definition: parsenodes.h:647
Alias * alias
Definition: parsenodes.h:648
ParseLoc location
Definition: parsenodes.h:710
TypeName * typeName
Definition: parsenodes.h:705
List * namespaces
Definition: parsenodes.h:689
Node * docexpr
Definition: parsenodes.h:687
ParseLoc location
Definition: parsenodes.h:692
Node * rowexpr
Definition: parsenodes.h:688
List * columns
Definition: parsenodes.h:690
Alias * alias
Definition: parsenodes.h:691
ParseLoc location
Definition: parsenodes.h:730
struct TableSampleClause * tablesample
Definition: parsenodes.h:1129
RTEKind rtekind
Definition: parsenodes.h:1078
char * relname
Definition: primnodes.h:83
bool inh
Definition: primnodes.h:86
Alias * alias
Definition: primnodes.h:92
char * schemaname
Definition: primnodes.h:80
Node * val
Definition: parsenodes.h:547
ParseLoc location
Definition: parsenodes.h:548
char * name
Definition: parsenodes.h:545
List * args
Definition: primnodes.h:1448
SortByNulls sortby_nulls
Definition: parsenodes.h:576
Node * node
Definition: parsenodes.h:574
List * useOp
Definition: parsenodes.h:577
SortByDir sortby_dir
Definition: parsenodes.h:575
ParseLoc location
Definition: parsenodes.h:578
Index tleSortGroupRef
Definition: parsenodes.h:1469
Definition: value.h:64
ParseLoc location
Definition: primnodes.h:146
Node * docexpr
Definition: primnodes.h:120
Node * rowexpr
Definition: primnodes.h:122
List * colexprs
Definition: primnodes.h:132
TableFuncType functype
Definition: primnodes.h:114
Expr * expr
Definition: primnodes.h:2239
Index ressortgroupref
Definition: primnodes.h:2245
List * parameterTypes
Definition: tsmapi.h:61
bool repeatable_across_queries
Definition: tsmapi.h:64
bool setof
Definition: parsenodes.h:287
Definition: primnodes.h:262
VarReturningType varreturningtype
Definition: primnodes.h:297
Node * startOffset
Definition: parsenodes.h:1578
List * partitionClause
Definition: parsenodes.h:1574
Node * endOffset
Definition: parsenodes.h:1579
List * orderClause
Definition: parsenodes.h:1576
List * orderClause
Definition: parsenodes.h:595
ParseLoc location
Definition: parsenodes.h:599
List * partitionClause
Definition: parsenodes.h:594
Node * startOffset
Definition: parsenodes.h:597
char * refname
Definition: parsenodes.h:593
Node * endOffset
Definition: parsenodes.h:598
int frameOptions
Definition: parsenodes.h:596
char * name
Definition: parsenodes.h:592
CatCTup * members[FLEXIBLE_ARRAY_MEMBER]
Definition: catcache.h:185
int n_members
Definition: catcache.h:183
HeapTupleData tuple
Definition: catcache.h:124
#define SearchSysCacheList2(cacheId, key1, key2)
Definition: syscache.h:129
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126
TsmRoutine * GetTsmRoutine(Oid tsmhandler)
Definition: tablesample.c:27
TargetEntry * get_sortgroupclause_tle(SortGroupClause *sgClause, List *targetList)
Definition: tlist.c:367
TargetEntry * get_sortgroupref_tle(Index sortref, List *targetList)
Definition: tlist.c:345
Node * get_sortgroupclause_expr(SortGroupClause *sgClause, List *targetList)
Definition: tlist.c:379
String * makeString(char *str)
Definition: value.c:63
#define intVal(v)
Definition: value.h:79
#define strVal(v)
Definition: value.h:82
bool contain_vars_of_level(Node *node, int levelsup)
Definition: var.c:444
int locate_var_of_level(Node *node, int levelsup)
Definition: var.c:555
const char * name