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1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * analyze.c
4 : : * transform the raw parse tree into a query tree
5 : : *
6 : : * For optimizable statements, we are careful to obtain a suitable lock on
7 : : * each referenced table, and other modules of the backend preserve or
8 : : * re-obtain these locks before depending on the results. It is therefore
9 : : * okay to do significant semantic analysis of these statements. For
10 : : * utility commands, no locks are obtained here (and if they were, we could
11 : : * not be sure we'd still have them at execution). Hence the general rule
12 : : * for utility commands is to just dump them into a Query node untransformed.
13 : : * DECLARE CURSOR, EXPLAIN, and CREATE TABLE AS are exceptions because they
14 : : * contain optimizable statements, which we should transform.
15 : : *
16 : : *
17 : : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
18 : : * Portions Copyright (c) 1994, Regents of the University of California
19 : : *
20 : : * src/backend/parser/analyze.c
21 : : *
22 : : *-------------------------------------------------------------------------
23 : : */
24 : :
25 : : #include "postgres.h"
26 : :
27 : : #include "access/stratnum.h"
28 : : #include "access/sysattr.h"
29 : : #include "catalog/dependency.h"
30 : : #include "catalog/pg_am.h"
31 : : #include "catalog/pg_operator.h"
32 : : #include "catalog/pg_proc.h"
33 : : #include "catalog/pg_type.h"
34 : : #include "commands/defrem.h"
35 : : #include "miscadmin.h"
36 : : #include "nodes/makefuncs.h"
37 : : #include "nodes/nodeFuncs.h"
38 : : #include "nodes/queryjumble.h"
39 : : #include "optimizer/optimizer.h"
40 : : #include "parser/analyze.h"
41 : : #include "parser/parse_agg.h"
42 : : #include "parser/parse_clause.h"
43 : : #include "parser/parse_coerce.h"
44 : : #include "parser/parse_collate.h"
45 : : #include "parser/parse_cte.h"
46 : : #include "parser/parse_expr.h"
47 : : #include "parser/parse_func.h"
48 : : #include "parser/parse_merge.h"
49 : : #include "parser/parse_oper.h"
50 : : #include "parser/parse_param.h"
51 : : #include "parser/parse_relation.h"
52 : : #include "parser/parse_target.h"
53 : : #include "parser/parse_type.h"
54 : : #include "parser/parsetree.h"
55 : : #include "utils/backend_status.h"
56 : : #include "utils/builtins.h"
57 : : #include "utils/fmgroids.h"
58 : : #include "utils/guc.h"
59 : : #include "utils/lsyscache.h"
60 : : #include "utils/rangetypes.h"
61 : : #include "utils/rel.h"
62 : : #include "utils/syscache.h"
63 : :
64 : :
65 : : /* Passthrough data for transformPLAssignStmtTarget */
66 : : typedef struct SelectStmtPassthrough
67 : : {
68 : : PLAssignStmt *stmt; /* the assignment statement */
69 : : Node *target; /* node representing the target variable */
70 : : List *indirection; /* indirection yet to be applied to target */
71 : : } SelectStmtPassthrough;
72 : :
73 : : /* Hook for plugins to get control at end of parse analysis */
74 : : post_parse_analyze_hook_type post_parse_analyze_hook = NULL;
75 : :
76 : : static Query *transformOptionalSelectInto(ParseState *pstate, Node *parseTree);
77 : : static Query *transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt);
78 : : static Query *transformInsertStmt(ParseState *pstate, InsertStmt *stmt);
79 : : static OnConflictExpr *transformOnConflictClause(ParseState *pstate,
80 : : OnConflictClause *onConflictClause);
81 : : static ForPortionOfExpr *transformForPortionOfClause(ParseState *pstate,
82 : : int rtindex,
83 : : const ForPortionOfClause *forPortionOf,
84 : : const Node *whereClause,
85 : : bool isUpdate);
86 : : static int count_rowexpr_columns(ParseState *pstate, Node *expr);
87 : : static Query *transformSelectStmt(ParseState *pstate, SelectStmt *stmt,
88 : : SelectStmtPassthrough *passthru);
89 : : static Query *transformValuesClause(ParseState *pstate, SelectStmt *stmt);
90 : : static Query *transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt);
91 : : static Node *transformSetOperationTree(ParseState *pstate, SelectStmt *stmt,
92 : : bool isTopLevel, List **targetlist);
93 : : static void determineRecursiveColTypes(ParseState *pstate,
94 : : Node *larg, List *nrtargetlist);
95 : : static Query *transformReturnStmt(ParseState *pstate, ReturnStmt *stmt);
96 : : static Query *transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt);
97 : : static Query *transformPLAssignStmt(ParseState *pstate,
98 : : PLAssignStmt *stmt);
99 : : static List *transformPLAssignStmtTarget(ParseState *pstate, List *tlist,
100 : : SelectStmtPassthrough *passthru);
101 : : static Query *transformDeclareCursorStmt(ParseState *pstate,
102 : : DeclareCursorStmt *stmt);
103 : : static Query *transformExplainStmt(ParseState *pstate,
104 : : ExplainStmt *stmt);
105 : : static Query *transformCreateTableAsStmt(ParseState *pstate,
106 : : CreateTableAsStmt *stmt);
107 : : static Query *transformCallStmt(ParseState *pstate,
108 : : CallStmt *stmt);
109 : : static void transformLockingClause(ParseState *pstate, Query *qry,
110 : : LockingClause *lc, bool pushedDown);
111 : : #ifdef DEBUG_NODE_TESTS_ENABLED
112 : : static bool test_raw_expression_coverage(Node *node, void *context);
113 : : #endif
114 : :
115 : :
116 : : /*
117 : : * parse_analyze_fixedparams
118 : : * Analyze a raw parse tree and transform it to Query form.
119 : : *
120 : : * Optionally, information about $n parameter types can be supplied.
121 : : * References to $n indexes not defined by paramTypes[] are disallowed.
122 : : *
123 : : * The result is a Query node. Optimizable statements require considerable
124 : : * transformation, while utility-type statements are simply hung off
125 : : * a dummy CMD_UTILITY Query node.
126 : : */
127 : : Query *
128 : 493277 : parse_analyze_fixedparams(RawStmt *parseTree, const char *sourceText,
129 : : const Oid *paramTypes, int numParams,
130 : : QueryEnvironment *queryEnv)
131 : : {
132 : 493277 : ParseState *pstate = make_parsestate(NULL);
133 : : Query *query;
134 : 493277 : JumbleState *jstate = NULL;
135 : :
136 : : Assert(sourceText != NULL); /* required as of 8.4 */
137 : :
138 : 493277 : pstate->p_sourcetext = sourceText;
139 : :
140 [ + + ]: 493277 : if (numParams > 0)
141 : 1605 : setup_parse_fixed_parameters(pstate, paramTypes, numParams);
142 : :
143 : 493277 : pstate->p_queryEnv = queryEnv;
144 : :
145 : 493277 : query = transformTopLevelStmt(pstate, parseTree);
146 : :
147 [ + + ]: 487406 : if (IsQueryIdEnabled())
148 : 76441 : jstate = JumbleQuery(query);
149 : :
150 [ + + ]: 487406 : if (post_parse_analyze_hook)
151 : 76268 : (*post_parse_analyze_hook) (pstate, query, jstate);
152 : :
153 : 487406 : free_parsestate(pstate);
154 : :
155 : 487406 : pgstat_report_query_id(query->queryId, false);
156 : :
157 : 487406 : return query;
158 : : }
159 : :
160 : : /*
161 : : * parse_analyze_varparams
162 : : *
163 : : * This variant is used when it's okay to deduce information about $n
164 : : * symbol datatypes from context. The passed-in paramTypes[] array can
165 : : * be modified or enlarged (via repalloc).
166 : : */
167 : : Query *
168 : 7001 : parse_analyze_varparams(RawStmt *parseTree, const char *sourceText,
169 : : Oid **paramTypes, int *numParams,
170 : : QueryEnvironment *queryEnv)
171 : : {
172 : 7001 : ParseState *pstate = make_parsestate(NULL);
173 : : Query *query;
174 : 7001 : JumbleState *jstate = NULL;
175 : :
176 : : Assert(sourceText != NULL); /* required as of 8.4 */
177 : :
178 : 7001 : pstate->p_sourcetext = sourceText;
179 : :
180 : 7001 : setup_parse_variable_parameters(pstate, paramTypes, numParams);
181 : :
182 : 7001 : pstate->p_queryEnv = queryEnv;
183 : :
184 : 7001 : query = transformTopLevelStmt(pstate, parseTree);
185 : :
186 : : /* make sure all is well with parameter types */
187 : 6992 : check_variable_parameters(pstate, query);
188 : :
189 [ + + ]: 6992 : if (IsQueryIdEnabled())
190 : 288 : jstate = JumbleQuery(query);
191 : :
192 [ + + ]: 6992 : if (post_parse_analyze_hook)
193 : 288 : (*post_parse_analyze_hook) (pstate, query, jstate);
194 : :
195 : 6992 : free_parsestate(pstate);
196 : :
197 : 6992 : pgstat_report_query_id(query->queryId, false);
198 : :
199 : 6992 : return query;
200 : : }
201 : :
202 : : /*
203 : : * parse_analyze_withcb
204 : : *
205 : : * This variant is used when the caller supplies their own parser callback to
206 : : * resolve parameters and possibly other things.
207 : : */
208 : : Query *
209 : 25025 : parse_analyze_withcb(RawStmt *parseTree, const char *sourceText,
210 : : ParserSetupHook parserSetup,
211 : : void *parserSetupArg,
212 : : QueryEnvironment *queryEnv)
213 : : {
214 : 25025 : ParseState *pstate = make_parsestate(NULL);
215 : : Query *query;
216 : 25025 : JumbleState *jstate = NULL;
217 : :
218 : : Assert(sourceText != NULL); /* required as of 8.4 */
219 : :
220 : 25025 : pstate->p_sourcetext = sourceText;
221 : 25025 : pstate->p_queryEnv = queryEnv;
222 : 25025 : (*parserSetup) (pstate, parserSetupArg);
223 : :
224 : 25025 : query = transformTopLevelStmt(pstate, parseTree);
225 : :
226 [ + + ]: 24950 : if (IsQueryIdEnabled())
227 : 4202 : jstate = JumbleQuery(query);
228 : :
229 [ + + ]: 24950 : if (post_parse_analyze_hook)
230 : 4199 : (*post_parse_analyze_hook) (pstate, query, jstate);
231 : :
232 : 24950 : free_parsestate(pstate);
233 : :
234 : 24950 : pgstat_report_query_id(query->queryId, false);
235 : :
236 : 24950 : return query;
237 : : }
238 : :
239 : :
240 : : /*
241 : : * parse_sub_analyze
242 : : * Entry point for recursively analyzing a sub-statement.
243 : : */
244 : : Query *
245 : 72986 : parse_sub_analyze(Node *parseTree, ParseState *parentParseState,
246 : : CommonTableExpr *parentCTE,
247 : : bool locked_from_parent,
248 : : bool resolve_unknowns)
249 : : {
250 : 72986 : ParseState *pstate = make_parsestate(parentParseState);
251 : : Query *query;
252 : :
253 : 72986 : pstate->p_parent_cte = parentCTE;
254 : 72986 : pstate->p_locked_from_parent = locked_from_parent;
255 : 72986 : pstate->p_resolve_unknowns = resolve_unknowns;
256 : :
257 : 72986 : query = transformStmt(pstate, parseTree);
258 : :
259 : 72845 : free_parsestate(pstate);
260 : :
261 : 72845 : return query;
262 : : }
263 : :
264 : : /*
265 : : * transformTopLevelStmt -
266 : : * transform a Parse tree into a Query tree.
267 : : *
268 : : * This function is just responsible for transferring statement location data
269 : : * from the RawStmt into the finished Query.
270 : : */
271 : : Query *
272 : 527744 : transformTopLevelStmt(ParseState *pstate, RawStmt *parseTree)
273 : : {
274 : : Query *result;
275 : :
276 : : /* We're at top level, so allow SELECT INTO */
277 : 527744 : result = transformOptionalSelectInto(pstate, parseTree->stmt);
278 : :
279 : 521785 : result->stmt_location = parseTree->stmt_location;
280 : 521785 : result->stmt_len = parseTree->stmt_len;
281 : :
282 : 521785 : return result;
283 : : }
284 : :
285 : : /*
286 : : * transformOptionalSelectInto -
287 : : * If SELECT has INTO, convert it to CREATE TABLE AS.
288 : : *
289 : : * The only thing we do here that we don't do in transformStmt() is to
290 : : * convert SELECT ... INTO into CREATE TABLE AS. Since utility statements
291 : : * aren't allowed within larger statements, this is only allowed at the top
292 : : * of the parse tree, and so we only try it before entering the recursive
293 : : * transformStmt() processing.
294 : : */
295 : : static Query *
296 : 544474 : transformOptionalSelectInto(ParseState *pstate, Node *parseTree)
297 : : {
298 [ + + ]: 544474 : if (IsA(parseTree, SelectStmt))
299 : : {
300 : 236472 : SelectStmt *stmt = (SelectStmt *) parseTree;
301 : :
302 : : /* If it's a set-operation tree, drill down to leftmost SelectStmt */
303 [ + - + + ]: 243576 : while (stmt && stmt->op != SETOP_NONE)
304 : 7104 : stmt = stmt->larg;
305 : : Assert(stmt && IsA(stmt, SelectStmt) && stmt->larg == NULL);
306 : :
307 [ + + ]: 236472 : if (stmt->intoClause)
308 : : {
309 : 71 : CreateTableAsStmt *ctas = makeNode(CreateTableAsStmt);
310 : :
311 : 71 : ctas->query = parseTree;
312 : 71 : ctas->into = stmt->intoClause;
313 : 71 : ctas->objtype = OBJECT_TABLE;
314 : 71 : ctas->is_select_into = true;
315 : :
316 : : /*
317 : : * Remove the intoClause from the SelectStmt. This makes it safe
318 : : * for transformSelectStmt to complain if it finds intoClause set
319 : : * (implying that the INTO appeared in a disallowed place).
320 : : */
321 : 71 : stmt->intoClause = NULL;
322 : :
323 : 71 : parseTree = (Node *) ctas;
324 : : }
325 : : }
326 : :
327 : 544474 : return transformStmt(pstate, parseTree);
328 : : }
329 : :
330 : : /*
331 : : * transformStmt -
332 : : * recursively transform a Parse tree into a Query tree.
333 : : */
334 : : Query *
335 : 630139 : transformStmt(ParseState *pstate, Node *parseTree)
336 : : {
337 : : Query *result;
338 : :
339 : : #ifdef DEBUG_NODE_TESTS_ENABLED
340 : :
341 : : /*
342 : : * We apply debug_raw_expression_coverage_test testing to basic DML
343 : : * statements; we can't just run it on everything because
344 : : * raw_expression_tree_walker() doesn't claim to handle utility
345 : : * statements.
346 : : */
347 [ + - ]: 630139 : if (Debug_raw_expression_coverage_test)
348 : : {
349 [ + + ]: 630139 : switch (nodeTag(parseTree))
350 : : {
351 : 377991 : case T_SelectStmt:
352 : : case T_InsertStmt:
353 : : case T_UpdateStmt:
354 : : case T_DeleteStmt:
355 : : case T_MergeStmt:
356 : 377991 : (void) test_raw_expression_coverage(parseTree, NULL);
357 : 377991 : break;
358 : 252148 : default:
359 : 252148 : break;
360 : : }
361 : : }
362 : : #endif /* DEBUG_NODE_TESTS_ENABLED */
363 : :
364 : : /*
365 : : * Caution: when changing the set of statement types that have non-default
366 : : * processing here, see also stmt_requires_parse_analysis() and
367 : : * analyze_requires_snapshot().
368 : : */
369 [ + + + + : 630139 : switch (nodeTag(parseTree))
+ + + + +
+ + + ]
370 : : {
371 : : /*
372 : : * Optimizable statements
373 : : */
374 : 45510 : case T_InsertStmt:
375 : 45510 : result = transformInsertStmt(pstate, (InsertStmt *) parseTree);
376 : 44515 : break;
377 : :
378 : 3412 : case T_DeleteStmt:
379 : 3412 : result = transformDeleteStmt(pstate, (DeleteStmt *) parseTree);
380 : 3320 : break;
381 : :
382 : 9372 : case T_UpdateStmt:
383 : 9372 : result = transformUpdateStmt(pstate, (UpdateStmt *) parseTree);
384 : 9235 : break;
385 : :
386 : 1386 : case T_MergeStmt:
387 : 1386 : result = transformMergeStmt(pstate, (MergeStmt *) parseTree);
388 : 1342 : break;
389 : :
390 : 318311 : case T_SelectStmt:
391 : : {
392 : 318311 : SelectStmt *n = (SelectStmt *) parseTree;
393 : :
394 [ + + ]: 318311 : if (n->valuesLists)
395 : 5839 : result = transformValuesClause(pstate, n);
396 [ + + ]: 312472 : else if (n->op == SETOP_NONE)
397 : 303897 : result = transformSelectStmt(pstate, n, NULL);
398 : : else
399 : 8575 : result = transformSetOperationStmt(pstate, n);
400 : : }
401 : 313509 : break;
402 : :
403 : 2776 : case T_ReturnStmt:
404 : 2776 : result = transformReturnStmt(pstate, (ReturnStmt *) parseTree);
405 : 2772 : break;
406 : :
407 : 3346 : case T_PLAssignStmt:
408 : 3346 : result = transformPLAssignStmt(pstate,
409 : : (PLAssignStmt *) parseTree);
410 : 3333 : break;
411 : :
412 : : /*
413 : : * Special cases
414 : : */
415 : 2755 : case T_DeclareCursorStmt:
416 : 2755 : result = transformDeclareCursorStmt(pstate,
417 : : (DeclareCursorStmt *) parseTree);
418 : 2742 : break;
419 : :
420 : 16730 : case T_ExplainStmt:
421 : 16730 : result = transformExplainStmt(pstate,
422 : : (ExplainStmt *) parseTree);
423 : 16725 : break;
424 : :
425 : 1319 : case T_CreateTableAsStmt:
426 : 1319 : result = transformCreateTableAsStmt(pstate,
427 : : (CreateTableAsStmt *) parseTree);
428 : 1309 : break;
429 : :
430 : 313 : case T_CallStmt:
431 : 313 : result = transformCallStmt(pstate,
432 : : (CallStmt *) parseTree);
433 : 292 : break;
434 : :
435 : 224909 : default:
436 : :
437 : : /*
438 : : * other statements don't require any transformation; just return
439 : : * the original parsetree with a Query node plastered on top.
440 : : */
441 : 224909 : result = makeNode(Query);
442 : 224909 : result->commandType = CMD_UTILITY;
443 : 224909 : result->utilityStmt = parseTree;
444 : 224909 : break;
445 : : }
446 : :
447 : : /* Mark as original query until we learn differently */
448 : 624003 : result->querySource = QSRC_ORIGINAL;
449 : 624003 : result->canSetTag = true;
450 : :
451 : 624003 : return result;
452 : : }
453 : :
454 : : /*
455 : : * stmt_requires_parse_analysis
456 : : * Returns true if parse analysis will do anything non-trivial
457 : : * with the given raw parse tree.
458 : : *
459 : : * Generally, this should return true for any statement type for which
460 : : * transformStmt() does more than wrap a CMD_UTILITY Query around it.
461 : : * When it returns false, the caller can assume that there is no situation
462 : : * in which parse analysis of the raw statement could need to be re-done.
463 : : *
464 : : * Currently, since the rewriter and planner do nothing for CMD_UTILITY
465 : : * Queries, a false result means that the entire parse analysis/rewrite/plan
466 : : * pipeline will never need to be re-done. If that ever changes, callers
467 : : * will likely need adjustment.
468 : : */
469 : : bool
470 : 19240615 : stmt_requires_parse_analysis(RawStmt *parseTree)
471 : : {
472 : : bool result;
473 : :
474 [ + + + ]: 19240615 : switch (nodeTag(parseTree->stmt))
475 : : {
476 : : /*
477 : : * Optimizable statements
478 : : */
479 : 18719307 : case T_InsertStmt:
480 : : case T_DeleteStmt:
481 : : case T_UpdateStmt:
482 : : case T_MergeStmt:
483 : : case T_SelectStmt:
484 : : case T_ReturnStmt:
485 : : case T_PLAssignStmt:
486 : 18719307 : result = true;
487 : 18719307 : break;
488 : :
489 : : /*
490 : : * Special cases
491 : : */
492 : 31272 : case T_DeclareCursorStmt:
493 : : case T_ExplainStmt:
494 : : case T_CreateTableAsStmt:
495 : : case T_CallStmt:
496 : 31272 : result = true;
497 : 31272 : break;
498 : :
499 : 490036 : default:
500 : : /* all other statements just get wrapped in a CMD_UTILITY Query */
501 : 490036 : result = false;
502 : 490036 : break;
503 : : }
504 : :
505 : 19240615 : return result;
506 : : }
507 : :
508 : : /*
509 : : * analyze_requires_snapshot
510 : : * Returns true if a snapshot must be set before doing parse analysis
511 : : * on the given raw parse tree.
512 : : */
513 : : bool
514 : 462529 : analyze_requires_snapshot(RawStmt *parseTree)
515 : : {
516 : : /*
517 : : * Currently, this should return true in exactly the same cases that
518 : : * stmt_requires_parse_analysis() does, so we just invoke that function
519 : : * rather than duplicating it. We keep the two entry points separate for
520 : : * clarity of callers, since from the callers' standpoint these are
521 : : * different conditions.
522 : : *
523 : : * While there may someday be a statement type for which transformStmt()
524 : : * does something nontrivial and yet no snapshot is needed for that
525 : : * processing, it seems likely that making such a choice would be fragile.
526 : : * If you want to install an exception, document the reasoning for it in a
527 : : * comment.
528 : : */
529 : 462529 : return stmt_requires_parse_analysis(parseTree);
530 : : }
531 : :
532 : : /*
533 : : * query_requires_rewrite_plan()
534 : : * Returns true if rewriting or planning is non-trivial for this Query.
535 : : *
536 : : * This is much like stmt_requires_parse_analysis(), but applies one step
537 : : * further down the pipeline.
538 : : *
539 : : * We do not provide an equivalent of analyze_requires_snapshot(): callers
540 : : * can assume that any rewriting or planning activity needs a snapshot.
541 : : */
542 : : bool
543 : 382740 : query_requires_rewrite_plan(Query *query)
544 : : {
545 : : bool result;
546 : :
547 [ + - ]: 382740 : if (query->commandType != CMD_UTILITY)
548 : : {
549 : : /* All optimizable statements require rewriting/planning */
550 : 382740 : result = true;
551 : : }
552 : : else
553 : : {
554 : : /* This list should match stmt_requires_parse_analysis() */
555 [ # # ]: 0 : switch (nodeTag(query->utilityStmt))
556 : : {
557 : 0 : case T_DeclareCursorStmt:
558 : : case T_ExplainStmt:
559 : : case T_CreateTableAsStmt:
560 : : case T_CallStmt:
561 : 0 : result = true;
562 : 0 : break;
563 : 0 : default:
564 : 0 : result = false;
565 : 0 : break;
566 : : }
567 : : }
568 : 382740 : return result;
569 : : }
570 : :
571 : : /*
572 : : * transformDeleteStmt -
573 : : * transforms a Delete Statement
574 : : */
575 : : static Query *
576 : 3412 : transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt)
577 : : {
578 : 3412 : Query *qry = makeNode(Query);
579 : : ParseNamespaceItem *nsitem;
580 : : Node *qual;
581 : :
582 : 3412 : qry->commandType = CMD_DELETE;
583 : :
584 : : /* process the WITH clause independently of all else */
585 [ + + ]: 3412 : if (stmt->withClause)
586 : : {
587 : 20 : qry->hasRecursive = stmt->withClause->recursive;
588 : 20 : qry->cteList = transformWithClause(pstate, stmt->withClause);
589 : 20 : qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
590 : : }
591 : :
592 : : /* set up range table with just the result rel */
593 : 6820 : qry->resultRelation = setTargetTable(pstate, stmt->relation,
594 : 3412 : stmt->relation->inh,
595 : : true,
596 : : ACL_DELETE);
597 : 3408 : nsitem = pstate->p_target_nsitem;
598 : :
599 : : /* disallow DELETE ... WHERE CURRENT OF on a view */
600 [ + + ]: 3408 : if (stmt->whereClause &&
601 [ + + ]: 2286 : IsA(stmt->whereClause, CurrentOfExpr) &&
602 [ + + ]: 80 : pstate->p_target_relation->rd_rel->relkind == RELKIND_VIEW)
603 [ + - ]: 4 : ereport(ERROR,
604 : : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
605 : : errmsg("WHERE CURRENT OF on a view is not implemented"));
606 : :
607 : : /* there's no DISTINCT in DELETE */
608 : 3404 : qry->distinctClause = NIL;
609 : :
610 : : /* subqueries in USING cannot access the result relation */
611 : 3404 : nsitem->p_lateral_only = true;
612 : 3404 : nsitem->p_lateral_ok = false;
613 : :
614 : : /*
615 : : * The USING clause is non-standard SQL syntax, and is equivalent in
616 : : * functionality to the FROM list that can be specified for UPDATE. The
617 : : * USING keyword is used rather than FROM because FROM is already a
618 : : * keyword in the DELETE syntax.
619 : : */
620 : 3404 : transformFromClause(pstate, stmt->usingClause);
621 : :
622 : : /* remaining clauses can reference the result relation normally */
623 : 3392 : nsitem->p_lateral_only = false;
624 : 3392 : nsitem->p_lateral_ok = true;
625 : :
626 [ + + ]: 3392 : if (stmt->forPortionOf)
627 : 439 : qry->forPortionOf = transformForPortionOfClause(pstate,
628 : : qry->resultRelation,
629 : 491 : stmt->forPortionOf,
630 : 491 : stmt->whereClause,
631 : : false);
632 : :
633 : 3340 : qual = transformWhereClause(pstate, stmt->whereClause,
634 : : EXPR_KIND_WHERE, "WHERE");
635 : :
636 : 3324 : transformReturningClause(pstate, qry, stmt->returningClause,
637 : : EXPR_KIND_RETURNING);
638 : :
639 : : /* done building the range table and jointree */
640 : 3320 : qry->rtable = pstate->p_rtable;
641 : 3320 : qry->rteperminfos = pstate->p_rteperminfos;
642 : 3320 : qry->jointree = makeFromExpr(pstate->p_joinlist, qual);
643 : :
644 : 3320 : qry->hasSubLinks = pstate->p_hasSubLinks;
645 : 3320 : qry->hasWindowFuncs = pstate->p_hasWindowFuncs;
646 : 3320 : qry->hasTargetSRFs = pstate->p_hasTargetSRFs;
647 : 3320 : qry->hasAggs = pstate->p_hasAggs;
648 : :
649 : 3320 : assign_query_collations(pstate, qry);
650 : :
651 : : /* this must be done after collations, for reliable comparison of exprs */
652 [ - + ]: 3320 : if (pstate->p_hasAggs)
653 : 0 : parseCheckAggregates(pstate, qry);
654 : :
655 : 3320 : return qry;
656 : : }
657 : :
658 : : /*
659 : : * transformInsertStmt -
660 : : * transform an Insert Statement
661 : : */
662 : : static Query *
663 : 45510 : transformInsertStmt(ParseState *pstate, InsertStmt *stmt)
664 : : {
665 : 45510 : Query *qry = makeNode(Query);
666 : 45510 : SelectStmt *selectStmt = (SelectStmt *) stmt->selectStmt;
667 : 45510 : List *exprList = NIL;
668 : : bool isGeneralSelect;
669 : : List *sub_rtable;
670 : : List *sub_rteperminfos;
671 : : List *sub_namespace;
672 : : List *icolumns;
673 : : List *attrnos;
674 : : ParseNamespaceItem *nsitem;
675 : : RTEPermissionInfo *perminfo;
676 : : ListCell *icols;
677 : : ListCell *attnos;
678 : : ListCell *lc;
679 : : bool requiresUpdatePerm;
680 : : AclMode targetPerms;
681 : :
682 : : /* There can't be any outer WITH to worry about */
683 : : Assert(pstate->p_ctenamespace == NIL);
684 : :
685 : 45510 : qry->commandType = CMD_INSERT;
686 : :
687 : : /* process the WITH clause independently of all else */
688 [ + + ]: 45510 : if (stmt->withClause)
689 : : {
690 : 190 : qry->hasRecursive = stmt->withClause->recursive;
691 : 190 : qry->cteList = transformWithClause(pstate, stmt->withClause);
692 : 190 : qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
693 : : }
694 : :
695 : 45510 : qry->override = stmt->override;
696 : :
697 : : /*
698 : : * ON CONFLICT DO UPDATE and ON CONFLICT DO SELECT FOR UPDATE/SHARE
699 : : * require UPDATE permission on the target relation.
700 : : */
701 [ + + ]: 47071 : requiresUpdatePerm = (stmt->onConflictClause &&
702 [ + + ]: 1561 : (stmt->onConflictClause->action == ONCONFLICT_UPDATE ||
703 [ + + ]: 626 : (stmt->onConflictClause->action == ONCONFLICT_SELECT &&
704 [ + + ]: 240 : stmt->onConflictClause->lockStrength != LCS_NONE)));
705 : :
706 : : /*
707 : : * We have three cases to deal with: DEFAULT VALUES (selectStmt == NULL),
708 : : * VALUES list, or general SELECT input. We special-case VALUES, both for
709 : : * efficiency and so we can handle DEFAULT specifications.
710 : : *
711 : : * The grammar allows attaching ORDER BY, LIMIT, FOR UPDATE, or WITH to a
712 : : * VALUES clause. If we have any of those, treat it as a general SELECT;
713 : : * so it will work, but you can't use DEFAULT items together with those.
714 : : */
715 [ + + + + ]: 80959 : isGeneralSelect = (selectStmt && (selectStmt->valuesLists == NIL ||
716 [ + - ]: 35449 : selectStmt->sortClause != NIL ||
717 [ + - ]: 35449 : selectStmt->limitOffset != NULL ||
718 [ + - ]: 35449 : selectStmt->limitCount != NULL ||
719 [ + - ]: 35449 : selectStmt->lockingClause != NIL ||
720 [ - + ]: 35449 : selectStmt->withClause != NULL));
721 : :
722 : : /*
723 : : * If a non-nil rangetable/namespace was passed in, and we are doing
724 : : * INSERT/SELECT, arrange to pass the rangetable/rteperminfos/namespace
725 : : * down to the SELECT. This can only happen if we are inside a CREATE
726 : : * RULE, and in that case we want the rule's OLD and NEW rtable entries to
727 : : * appear as part of the SELECT's rtable, not as outer references for it.
728 : : * (Kluge!) The SELECT's joinlist is not affected however. We must do
729 : : * this before adding the target table to the INSERT's rtable.
730 : : */
731 [ + + ]: 45510 : if (isGeneralSelect)
732 : : {
733 : 4528 : sub_rtable = pstate->p_rtable;
734 : 4528 : pstate->p_rtable = NIL;
735 : 4528 : sub_rteperminfos = pstate->p_rteperminfos;
736 : 4528 : pstate->p_rteperminfos = NIL;
737 : 4528 : sub_namespace = pstate->p_namespace;
738 : 4528 : pstate->p_namespace = NIL;
739 : : }
740 : : else
741 : : {
742 : 40982 : sub_rtable = NIL; /* not used, but keep compiler quiet */
743 : 40982 : sub_rteperminfos = NIL;
744 : 40982 : sub_namespace = NIL;
745 : : }
746 : :
747 : : /*
748 : : * Must get write lock on INSERT target table before scanning SELECT, else
749 : : * we will grab the wrong kind of initial lock if the target table is also
750 : : * mentioned in the SELECT part. Note that the target table is not added
751 : : * to the joinlist or namespace.
752 : : */
753 : 45510 : targetPerms = ACL_INSERT;
754 [ + + ]: 45510 : if (requiresUpdatePerm)
755 : 1013 : targetPerms |= ACL_UPDATE;
756 : 45510 : qry->resultRelation = setTargetTable(pstate, stmt->relation,
757 : : false, false, targetPerms);
758 : :
759 : : /* Validate stmt->cols list, or build default list if no list given */
760 : 45494 : icolumns = checkInsertTargets(pstate, stmt->cols, &attrnos);
761 : : Assert(list_length(icolumns) == list_length(attrnos));
762 : :
763 : : /*
764 : : * Determine which variant of INSERT we have.
765 : : */
766 [ + + ]: 45462 : if (selectStmt == NULL)
767 : : {
768 : : /*
769 : : * We have INSERT ... DEFAULT VALUES. We can handle this case by
770 : : * emitting an empty targetlist --- all columns will be defaulted when
771 : : * the planner expands the targetlist.
772 : : */
773 : 5533 : exprList = NIL;
774 : : }
775 [ + + ]: 39929 : else if (isGeneralSelect)
776 : : {
777 : : /*
778 : : * We make the sub-pstate a child of the outer pstate so that it can
779 : : * see any Param definitions supplied from above. Since the outer
780 : : * pstate's rtable and namespace are presently empty, there are no
781 : : * side-effects of exposing names the sub-SELECT shouldn't be able to
782 : : * see.
783 : : */
784 : 4528 : ParseState *sub_pstate = make_parsestate(pstate);
785 : : Query *selectQuery;
786 : :
787 : : /*
788 : : * Process the source SELECT.
789 : : *
790 : : * It is important that this be handled just like a standalone SELECT;
791 : : * otherwise the behavior of SELECT within INSERT might be different
792 : : * from a stand-alone SELECT. (Indeed, Postgres up through 6.5 had
793 : : * bugs of just that nature...)
794 : : *
795 : : * The sole exception is that we prevent resolving unknown-type
796 : : * outputs as TEXT. This does not change the semantics since if the
797 : : * column type matters semantically, it would have been resolved to
798 : : * something else anyway. Doing this lets us resolve such outputs as
799 : : * the target column's type, which we handle below.
800 : : */
801 : 4528 : sub_pstate->p_rtable = sub_rtable;
802 : 4528 : sub_pstate->p_rteperminfos = sub_rteperminfos;
803 : 4528 : sub_pstate->p_joinexprs = NIL; /* sub_rtable has no joins */
804 : 4528 : sub_pstate->p_nullingrels = NIL;
805 : 4528 : sub_pstate->p_namespace = sub_namespace;
806 : 4528 : sub_pstate->p_resolve_unknowns = false;
807 : :
808 : 4528 : selectQuery = transformStmt(sub_pstate, stmt->selectStmt);
809 : :
810 : 4524 : free_parsestate(sub_pstate);
811 : :
812 : : /* The grammar should have produced a SELECT */
813 [ + - ]: 4524 : if (!IsA(selectQuery, Query) ||
814 [ - + ]: 4524 : selectQuery->commandType != CMD_SELECT)
815 [ # # ]: 0 : elog(ERROR, "unexpected non-SELECT command in INSERT ... SELECT");
816 : :
817 : : /*
818 : : * Make the source be a subquery in the INSERT's rangetable, and add
819 : : * it to the INSERT's joinlist (but not the namespace).
820 : : */
821 : 4524 : nsitem = addRangeTableEntryForSubquery(pstate,
822 : : selectQuery,
823 : : NULL,
824 : : false,
825 : : false);
826 : 4524 : addNSItemToQuery(pstate, nsitem, true, false, false);
827 : :
828 : : /*----------
829 : : * Generate an expression list for the INSERT that selects all the
830 : : * non-resjunk columns from the subquery. (INSERT's tlist must be
831 : : * separate from the subquery's tlist because we may add columns,
832 : : * insert datatype coercions, etc.)
833 : : *
834 : : * HACK: unknown-type constants and params in the SELECT's targetlist
835 : : * are copied up as-is rather than being referenced as subquery
836 : : * outputs. This is to ensure that when we try to coerce them to
837 : : * the target column's datatype, the right things happen (see
838 : : * special cases in coerce_type). Otherwise, this fails:
839 : : * INSERT INTO foo SELECT 'bar', ... FROM baz
840 : : *----------
841 : : */
842 : 4524 : exprList = NIL;
843 [ + + + + : 15838 : foreach(lc, selectQuery->targetList)
+ + ]
844 : : {
845 : 11314 : TargetEntry *tle = (TargetEntry *) lfirst(lc);
846 : : Expr *expr;
847 : :
848 [ + + ]: 11314 : if (tle->resjunk)
849 : 64 : continue;
850 [ + - ]: 11250 : if (tle->expr &&
851 [ + + + + : 13958 : (IsA(tle->expr, Const) || IsA(tle->expr, Param)) &&
+ + ]
852 : 2708 : exprType((Node *) tle->expr) == UNKNOWNOID)
853 : 843 : expr = tle->expr;
854 : : else
855 : : {
856 : 10407 : Var *var = makeVarFromTargetEntry(nsitem->p_rtindex, tle);
857 : :
858 : 10407 : var->location = exprLocation((Node *) tle->expr);
859 : 10407 : expr = (Expr *) var;
860 : : }
861 : 11250 : exprList = lappend(exprList, expr);
862 : : }
863 : :
864 : : /* Prepare row for assignment to target table */
865 : 4524 : exprList = transformInsertRow(pstate, exprList,
866 : : stmt->cols,
867 : : icolumns, attrnos,
868 : : false);
869 : : }
870 [ + + ]: 35401 : else if (list_length(selectStmt->valuesLists) > 1)
871 : : {
872 : : /*
873 : : * Process INSERT ... VALUES with multiple VALUES sublists. We
874 : : * generate a VALUES RTE holding the transformed expression lists, and
875 : : * build up a targetlist containing Vars that reference the VALUES
876 : : * RTE.
877 : : */
878 : 3384 : List *exprsLists = NIL;
879 : 3384 : List *coltypes = NIL;
880 : 3384 : List *coltypmods = NIL;
881 : 3384 : List *colcollations = NIL;
882 : 3384 : int sublist_length = -1;
883 : 3384 : bool lateral = false;
884 : :
885 : : Assert(selectStmt->intoClause == NULL);
886 : :
887 [ + - + + : 14864 : foreach(lc, selectStmt->valuesLists)
+ + ]
888 : : {
889 : 11480 : List *sublist = (List *) lfirst(lc);
890 : :
891 : : /*
892 : : * Do basic expression transformation (same as a ROW() expr, but
893 : : * allow SetToDefault at top level)
894 : : */
895 : 11480 : sublist = transformExpressionList(pstate, sublist,
896 : : EXPR_KIND_VALUES, true);
897 : :
898 : : /*
899 : : * All the sublists must be the same length, *after*
900 : : * transformation (which might expand '*' into multiple items).
901 : : * The VALUES RTE can't handle anything different.
902 : : */
903 [ + + ]: 11480 : if (sublist_length < 0)
904 : : {
905 : : /* Remember post-transformation length of first sublist */
906 : 3384 : sublist_length = list_length(sublist);
907 : : }
908 [ - + ]: 8096 : else if (sublist_length != list_length(sublist))
909 : : {
910 [ # # ]: 0 : ereport(ERROR,
911 : : (errcode(ERRCODE_SYNTAX_ERROR),
912 : : errmsg("VALUES lists must all be the same length"),
913 : : parser_errposition(pstate,
914 : : exprLocation((Node *) sublist))));
915 : : }
916 : :
917 : : /*
918 : : * Prepare row for assignment to target table. We process any
919 : : * indirection on the target column specs normally but then strip
920 : : * off the resulting field/array assignment nodes, since we don't
921 : : * want the parsed statement to contain copies of those in each
922 : : * VALUES row. (It's annoying to have to transform the
923 : : * indirection specs over and over like this, but avoiding it
924 : : * would take some really messy refactoring of
925 : : * transformAssignmentIndirection.)
926 : : */
927 : 11480 : sublist = transformInsertRow(pstate, sublist,
928 : : stmt->cols,
929 : : icolumns, attrnos,
930 : : true);
931 : :
932 : : /*
933 : : * We must assign collations now because assign_query_collations
934 : : * doesn't process rangetable entries. We just assign all the
935 : : * collations independently in each row, and don't worry about
936 : : * whether they are consistent vertically. The outer INSERT query
937 : : * isn't going to care about the collations of the VALUES columns,
938 : : * so it's not worth the effort to identify a common collation for
939 : : * each one here. (But note this does have one user-visible
940 : : * consequence: INSERT ... VALUES won't complain about conflicting
941 : : * explicit COLLATEs in a column, whereas the same VALUES
942 : : * construct in another context would complain.)
943 : : */
944 : 11480 : assign_list_collations(pstate, sublist);
945 : :
946 : 11480 : exprsLists = lappend(exprsLists, sublist);
947 : : }
948 : :
949 : : /*
950 : : * Construct column type/typmod/collation lists for the VALUES RTE.
951 : : * Every expression in each column has been coerced to the type/typmod
952 : : * of the corresponding target column or subfield, so it's sufficient
953 : : * to look at the exprType/exprTypmod of the first row. We don't care
954 : : * about the collation labeling, so just fill in InvalidOid for that.
955 : : */
956 [ + - + + : 9812 : foreach(lc, (List *) linitial(exprsLists))
+ + ]
957 : : {
958 : 6428 : Node *val = (Node *) lfirst(lc);
959 : :
960 : 6428 : coltypes = lappend_oid(coltypes, exprType(val));
961 : 6428 : coltypmods = lappend_int(coltypmods, exprTypmod(val));
962 : 6428 : colcollations = lappend_oid(colcollations, InvalidOid);
963 : : }
964 : :
965 : : /*
966 : : * Ordinarily there can't be any current-level Vars in the expression
967 : : * lists, because the namespace was empty ... but if we're inside
968 : : * CREATE RULE, then NEW/OLD references might appear. In that case we
969 : : * have to mark the VALUES RTE as LATERAL.
970 : : */
971 [ + + + - ]: 3402 : if (list_length(pstate->p_rtable) != 1 &&
972 : 18 : contain_vars_of_level((Node *) exprsLists, 0))
973 : 18 : lateral = true;
974 : :
975 : : /*
976 : : * Generate the VALUES RTE
977 : : */
978 : 3384 : nsitem = addRangeTableEntryForValues(pstate, exprsLists,
979 : : coltypes, coltypmods, colcollations,
980 : : NULL, lateral, true);
981 : 3384 : addNSItemToQuery(pstate, nsitem, true, false, false);
982 : :
983 : : /*
984 : : * Generate list of Vars referencing the RTE
985 : : */
986 : 3384 : exprList = expandNSItemVars(pstate, nsitem, 0, -1, NULL);
987 : :
988 : : /*
989 : : * Re-apply any indirection on the target column specs to the Vars
990 : : */
991 : 3384 : exprList = transformInsertRow(pstate, exprList,
992 : : stmt->cols,
993 : : icolumns, attrnos,
994 : : false);
995 : : }
996 : : else
997 : : {
998 : : /*
999 : : * Process INSERT ... VALUES with a single VALUES sublist. We treat
1000 : : * this case separately for efficiency. The sublist is just computed
1001 : : * directly as the Query's targetlist, with no VALUES RTE. So it
1002 : : * works just like a SELECT without any FROM.
1003 : : */
1004 : 32017 : List *valuesLists = selectStmt->valuesLists;
1005 : :
1006 : : Assert(list_length(valuesLists) == 1);
1007 : : Assert(selectStmt->intoClause == NULL);
1008 : :
1009 : : /*
1010 : : * Do basic expression transformation (same as a ROW() expr, but allow
1011 : : * SetToDefault at top level)
1012 : : */
1013 : 32017 : exprList = transformExpressionList(pstate,
1014 : 32017 : (List *) linitial(valuesLists),
1015 : : EXPR_KIND_VALUES_SINGLE,
1016 : : true);
1017 : :
1018 : : /* Prepare row for assignment to target table */
1019 : 32001 : exprList = transformInsertRow(pstate, exprList,
1020 : : stmt->cols,
1021 : : icolumns, attrnos,
1022 : : false);
1023 : : }
1024 : :
1025 : : /*
1026 : : * Generate query's target list using the computed list of expressions.
1027 : : * Also, mark all the target columns as needing insert permissions.
1028 : : */
1029 : 44591 : perminfo = pstate->p_target_nsitem->p_perminfo;
1030 : 44591 : qry->targetList = NIL;
1031 : : Assert(list_length(exprList) <= list_length(icolumns));
1032 [ + + + + : 131515 : forthree(lc, exprList, icols, icolumns, attnos, attrnos)
+ + + + +
+ + + + +
+ - + - +
+ ]
1033 : : {
1034 : 86924 : Expr *expr = (Expr *) lfirst(lc);
1035 : 86924 : ResTarget *col = lfirst_node(ResTarget, icols);
1036 : 86924 : AttrNumber attr_num = (AttrNumber) lfirst_int(attnos);
1037 : : TargetEntry *tle;
1038 : :
1039 : 86924 : tle = makeTargetEntry(expr,
1040 : : attr_num,
1041 : : col->name,
1042 : : false);
1043 : 86924 : qry->targetList = lappend(qry->targetList, tle);
1044 : :
1045 : 86924 : perminfo->insertedCols = bms_add_member(perminfo->insertedCols,
1046 : : attr_num - FirstLowInvalidHeapAttributeNumber);
1047 : : }
1048 : :
1049 : : /*
1050 : : * If we have any clauses yet to process, set the query namespace to
1051 : : * contain only the target relation, removing any entries added in a
1052 : : * sub-SELECT or VALUES list.
1053 : : */
1054 [ + + + + ]: 44591 : if (stmt->onConflictClause || stmt->returningClause)
1055 : : {
1056 : 2208 : pstate->p_namespace = NIL;
1057 : 2208 : addNSItemToQuery(pstate, pstate->p_target_nsitem,
1058 : : false, true, true);
1059 : : }
1060 : :
1061 : : /* ON CONFLICT DO SELECT requires a RETURNING clause */
1062 [ + + ]: 44591 : if (stmt->onConflictClause &&
1063 [ + + ]: 1561 : stmt->onConflictClause->action == ONCONFLICT_SELECT &&
1064 [ + + ]: 240 : !stmt->returningClause)
1065 [ + - ]: 4 : ereport(ERROR,
1066 : : errcode(ERRCODE_SYNTAX_ERROR),
1067 : : errmsg("ON CONFLICT DO SELECT requires a RETURNING clause"),
1068 : : parser_errposition(pstate, stmt->onConflictClause->location));
1069 : :
1070 : : /* Process ON CONFLICT, if any. */
1071 [ + + ]: 44587 : if (stmt->onConflictClause)
1072 : 1557 : qry->onConflict = transformOnConflictClause(pstate,
1073 : : stmt->onConflictClause);
1074 : :
1075 : : /* Process RETURNING, if any. */
1076 [ + + ]: 44547 : if (stmt->returningClause)
1077 : 1099 : transformReturningClause(pstate, qry, stmt->returningClause,
1078 : : EXPR_KIND_RETURNING);
1079 : :
1080 : : /* done building the range table and jointree */
1081 : 44515 : qry->rtable = pstate->p_rtable;
1082 : 44515 : qry->rteperminfos = pstate->p_rteperminfos;
1083 : 44515 : qry->jointree = makeFromExpr(pstate->p_joinlist, NULL);
1084 : :
1085 : 44515 : qry->hasTargetSRFs = pstate->p_hasTargetSRFs;
1086 : 44515 : qry->hasSubLinks = pstate->p_hasSubLinks;
1087 : :
1088 : 44515 : assign_query_collations(pstate, qry);
1089 : :
1090 : 44515 : return qry;
1091 : : }
1092 : :
1093 : : /*
1094 : : * Prepare an INSERT row for assignment to the target table.
1095 : : *
1096 : : * exprlist: transformed expressions for source values; these might come from
1097 : : * a VALUES row, or be Vars referencing a sub-SELECT or VALUES RTE output.
1098 : : * stmtcols: original target-columns spec for INSERT (we just test for NIL)
1099 : : * icolumns: effective target-columns spec (list of ResTarget)
1100 : : * attrnos: integer column numbers (must be same length as icolumns)
1101 : : * strip_indirection: if true, remove any field/array assignment nodes
1102 : : */
1103 : : List *
1104 : 52045 : transformInsertRow(ParseState *pstate, List *exprlist,
1105 : : List *stmtcols, List *icolumns, List *attrnos,
1106 : : bool strip_indirection)
1107 : : {
1108 : : List *result;
1109 : : ListCell *lc;
1110 : : ListCell *icols;
1111 : : ListCell *attnos;
1112 : :
1113 : : /*
1114 : : * Check length of expr list. It must not have more expressions than
1115 : : * there are target columns. We allow fewer, but only if no explicit
1116 : : * columns list was given (the remaining columns are implicitly
1117 : : * defaulted). Note we must check this *after* transformation because
1118 : : * that could expand '*' into multiple items.
1119 : : */
1120 [ + + ]: 52045 : if (list_length(exprlist) > list_length(icolumns))
1121 [ + - ]: 17 : ereport(ERROR,
1122 : : (errcode(ERRCODE_SYNTAX_ERROR),
1123 : : errmsg("INSERT has more expressions than target columns"),
1124 : : parser_errposition(pstate,
1125 : : exprLocation(list_nth(exprlist,
1126 : : list_length(icolumns))))));
1127 [ + + + + ]: 62997 : if (stmtcols != NIL &&
1128 : 10969 : list_length(exprlist) < list_length(icolumns))
1129 : : {
1130 : : /*
1131 : : * We can get here for cases like INSERT ... SELECT (a,b,c) FROM ...
1132 : : * where the user accidentally created a RowExpr instead of separate
1133 : : * columns. Add a suitable hint if that seems to be the problem,
1134 : : * because the main error message is quite misleading for this case.
1135 : : * (If there's no stmtcols, you'll get something about data type
1136 : : * mismatch, which is less misleading so we don't worry about giving a
1137 : : * hint in that case.)
1138 : : */
1139 [ + - - + : 8 : ereport(ERROR,
- - ]
1140 : : (errcode(ERRCODE_SYNTAX_ERROR),
1141 : : errmsg("INSERT has more target columns than expressions"),
1142 : : ((list_length(exprlist) == 1 &&
1143 : : count_rowexpr_columns(pstate, linitial(exprlist)) ==
1144 : : list_length(icolumns)) ?
1145 : : errhint("The insertion source is a row expression containing the same number of columns expected by the INSERT. Did you accidentally use extra parentheses?") : 0),
1146 : : parser_errposition(pstate,
1147 : : exprLocation(list_nth(icolumns,
1148 : : list_length(exprlist))))));
1149 : : }
1150 : :
1151 : : /*
1152 : : * Prepare columns for assignment to target table.
1153 : : */
1154 : 52020 : result = NIL;
1155 [ + + + + : 165526 : forthree(lc, exprlist, icols, icolumns, attnos, attrnos)
+ + + + +
+ + + + +
+ - + - +
+ ]
1156 : : {
1157 : 114332 : Expr *expr = (Expr *) lfirst(lc);
1158 : 114332 : ResTarget *col = lfirst_node(ResTarget, icols);
1159 : 114332 : int attno = lfirst_int(attnos);
1160 : :
1161 : 114332 : expr = transformAssignedExpr(pstate, expr,
1162 : : EXPR_KIND_INSERT_TARGET,
1163 : 114332 : col->name,
1164 : : attno,
1165 : : col->indirection,
1166 : : col->location);
1167 : :
1168 [ + + ]: 113506 : if (strip_indirection)
1169 : : {
1170 : : /*
1171 : : * We need to remove top-level FieldStores and SubscriptingRefs,
1172 : : * as well as any CoerceToDomain appearing above one of those ---
1173 : : * but not a CoerceToDomain that isn't above one of those.
1174 : : */
1175 [ + - ]: 25438 : while (expr)
1176 : : {
1177 : 25438 : Expr *subexpr = expr;
1178 : :
1179 [ + + ]: 25614 : while (IsA(subexpr, CoerceToDomain))
1180 : : {
1181 : 176 : subexpr = ((CoerceToDomain *) subexpr)->arg;
1182 : : }
1183 [ + + ]: 25438 : if (IsA(subexpr, FieldStore))
1184 : : {
1185 : 144 : FieldStore *fstore = (FieldStore *) subexpr;
1186 : :
1187 : 144 : expr = (Expr *) linitial(fstore->newvals);
1188 : : }
1189 [ + + ]: 25294 : else if (IsA(subexpr, SubscriptingRef))
1190 : : {
1191 : 232 : SubscriptingRef *sbsref = (SubscriptingRef *) subexpr;
1192 : :
1193 [ - + ]: 232 : if (sbsref->refassgnexpr == NULL)
1194 : 0 : break;
1195 : :
1196 : 232 : expr = sbsref->refassgnexpr;
1197 : : }
1198 : : else
1199 : 25062 : break;
1200 : : }
1201 : : }
1202 : :
1203 : 113506 : result = lappend(result, expr);
1204 : : }
1205 : :
1206 : 51194 : return result;
1207 : : }
1208 : :
1209 : : /*
1210 : : * transformOnConflictClause -
1211 : : * transforms an OnConflictClause in an INSERT
1212 : : */
1213 : : static OnConflictExpr *
1214 : 1557 : transformOnConflictClause(ParseState *pstate,
1215 : : OnConflictClause *onConflictClause)
1216 : : {
1217 : 1557 : ParseNamespaceItem *exclNSItem = NULL;
1218 : : List *arbiterElems;
1219 : : Node *arbiterWhere;
1220 : : Oid arbiterConstraint;
1221 : 1557 : List *onConflictSet = NIL;
1222 : 1557 : Node *onConflictWhere = NULL;
1223 : 1557 : int exclRelIndex = 0;
1224 : 1557 : List *exclRelTlist = NIL;
1225 : : OnConflictExpr *result;
1226 : :
1227 : : /*
1228 : : * If this is ON CONFLICT DO SELECT/UPDATE, first create the range table
1229 : : * entry for the EXCLUDED pseudo relation, so that that will be present
1230 : : * while processing arbiter expressions. (You can't actually reference it
1231 : : * from there, but this provides a useful error message if you try.)
1232 : : */
1233 [ + + ]: 1557 : if (onConflictClause->action == ONCONFLICT_UPDATE ||
1234 [ + + ]: 622 : onConflictClause->action == ONCONFLICT_SELECT)
1235 : : {
1236 : 1171 : Relation targetrel = pstate->p_target_relation;
1237 : : RangeTblEntry *exclRte;
1238 : :
1239 : 1171 : exclNSItem = addRangeTableEntryForRelation(pstate,
1240 : : targetrel,
1241 : : RowExclusiveLock,
1242 : : makeAlias("excluded", NIL),
1243 : : false, false);
1244 : 1171 : exclRte = exclNSItem->p_rte;
1245 : 1171 : exclRelIndex = exclNSItem->p_rtindex;
1246 : :
1247 : : /*
1248 : : * relkind is set to composite to signal that we're not dealing with
1249 : : * an actual relation, and no permission checks are required on it.
1250 : : * (We'll check the actual target relation, instead.)
1251 : : */
1252 : 1171 : exclRte->relkind = RELKIND_COMPOSITE_TYPE;
1253 : :
1254 : : /* Create EXCLUDED rel's targetlist for use by EXPLAIN */
1255 : 1171 : exclRelTlist = BuildOnConflictExcludedTargetlist(targetrel,
1256 : : exclRelIndex);
1257 : : }
1258 : :
1259 : : /* Process the arbiter clause, ON CONFLICT ON (...) */
1260 : 1557 : transformOnConflictArbiter(pstate, onConflictClause, &arbiterElems,
1261 : : &arbiterWhere, &arbiterConstraint);
1262 : :
1263 : : /* Process DO SELECT/UPDATE */
1264 [ + + ]: 1537 : if (onConflictClause->action == ONCONFLICT_UPDATE ||
1265 [ + + ]: 610 : onConflictClause->action == ONCONFLICT_SELECT)
1266 : : {
1267 : : /*
1268 : : * Add the EXCLUDED pseudo relation to the query namespace, making it
1269 : : * available in SET and WHERE subexpressions.
1270 : : */
1271 : 1163 : addNSItemToQuery(pstate, exclNSItem, false, true, true);
1272 : :
1273 : : /* Process the UPDATE SET clause */
1274 [ + + ]: 1163 : if (onConflictClause->action == ONCONFLICT_UPDATE)
1275 : : onConflictSet =
1276 : 927 : transformUpdateTargetList(pstate, onConflictClause->targetList, NULL);
1277 : :
1278 : : /* Process the SELECT/UPDATE WHERE clause */
1279 : 1143 : onConflictWhere = transformWhereClause(pstate,
1280 : : onConflictClause->whereClause,
1281 : : EXPR_KIND_WHERE, "WHERE");
1282 : :
1283 : : /*
1284 : : * Remove the EXCLUDED pseudo relation from the query namespace, since
1285 : : * it's not supposed to be available in RETURNING. (Maybe someday we
1286 : : * could allow that, and drop this step.)
1287 : : */
1288 : : Assert((ParseNamespaceItem *) llast(pstate->p_namespace) == exclNSItem);
1289 : 1143 : pstate->p_namespace = list_delete_last(pstate->p_namespace);
1290 : : }
1291 : :
1292 : : /* Finally, build ON CONFLICT DO [NOTHING | SELECT | UPDATE] expression */
1293 : 1517 : result = makeNode(OnConflictExpr);
1294 : :
1295 : 1517 : result->action = onConflictClause->action;
1296 : 1517 : result->arbiterElems = arbiterElems;
1297 : 1517 : result->arbiterWhere = arbiterWhere;
1298 : 1517 : result->constraint = arbiterConstraint;
1299 : 1517 : result->lockStrength = onConflictClause->lockStrength;
1300 : 1517 : result->onConflictSet = onConflictSet;
1301 : 1517 : result->onConflictWhere = onConflictWhere;
1302 : 1517 : result->exclRelIndex = exclRelIndex;
1303 : 1517 : result->exclRelTlist = exclRelTlist;
1304 : :
1305 : 1517 : return result;
1306 : : }
1307 : :
1308 : : /*
1309 : : * transformForPortionOfClause
1310 : : *
1311 : : * Transforms a ForPortionOfClause in an UPDATE/DELETE statement.
1312 : : *
1313 : : * - Look up the range/period requested.
1314 : : * - Build a compatible range value from the FROM and TO expressions.
1315 : : * - Build an "overlaps" expression for filtering, used later by the
1316 : : * rewriter.
1317 : : * - For UPDATEs, build an "intersects" expression the rewriter can add
1318 : : * to the targetList to change the temporal bounds.
1319 : : */
1320 : : static ForPortionOfExpr *
1321 : 1133 : transformForPortionOfClause(ParseState *pstate,
1322 : : int rtindex,
1323 : : const ForPortionOfClause *forPortionOf,
1324 : : const Node *whereClause,
1325 : : bool isUpdate)
1326 : : {
1327 : 1133 : Relation targetrel = pstate->p_target_relation;
1328 : 1133 : int range_attno = InvalidAttrNumber;
1329 : : Form_pg_attribute attr;
1330 : : Oid attbasetype;
1331 : : Oid opclass;
1332 : : Oid opfamily;
1333 : : Oid opcintype;
1334 : 1133 : Oid funcid = InvalidOid;
1335 : : StrategyNumber strat;
1336 : : Oid opid;
1337 : : OpExpr *op;
1338 : : ForPortionOfExpr *result;
1339 : : Var *rangeVar;
1340 : :
1341 : : /* disallow FOR PORTION OF ... WHERE CURRENT OF */
1342 [ + + + + ]: 1133 : if (whereClause && IsA(whereClause, CurrentOfExpr))
1343 [ + - ]: 8 : ereport(ERROR,
1344 : : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1345 : : errmsg("WHERE CURRENT OF with FOR PORTION OF is not implemented"));
1346 : :
1347 : 1125 : result = makeNode(ForPortionOfExpr);
1348 : :
1349 : : /* Look up the FOR PORTION OF name requested. */
1350 : 1125 : range_attno = attnameAttNum(targetrel, forPortionOf->range_name, false);
1351 [ + + ]: 1125 : if (range_attno == InvalidAttrNumber)
1352 [ + - ]: 8 : ereport(ERROR,
1353 : : (errcode(ERRCODE_UNDEFINED_COLUMN),
1354 : : errmsg("column \"%s\" of relation \"%s\" does not exist",
1355 : : forPortionOf->range_name,
1356 : : RelationGetRelationName(targetrel)),
1357 : : parser_errposition(pstate, forPortionOf->location)));
1358 : 1117 : attr = TupleDescAttr(targetrel->rd_att, range_attno - 1);
1359 : :
1360 : 1117 : attbasetype = getBaseType(attr->atttypid);
1361 : :
1362 : 1117 : rangeVar = makeVar(rtindex,
1363 : : range_attno,
1364 : : attr->atttypid,
1365 : : attr->atttypmod,
1366 : : attr->attcollation,
1367 : : 0);
1368 : 1117 : rangeVar->location = forPortionOf->location;
1369 : 1117 : result->rangeVar = rangeVar;
1370 : :
1371 : : /* Require SELECT privilege on the application-time column. */
1372 : 1117 : markVarForSelectPriv(pstate, rangeVar);
1373 : :
1374 : : /*
1375 : : * Use the basetype for the target, which shouldn't be required to follow
1376 : : * domain rules. The table's column type is in the Var if we need it.
1377 : : */
1378 : 1117 : result->rangeType = attbasetype;
1379 : 1117 : result->isDomain = attbasetype != attr->atttypid;
1380 : :
1381 [ + + ]: 1117 : if (forPortionOf->target)
1382 : : {
1383 : 204 : Oid declared_target_type = attbasetype;
1384 : : Oid actual_target_type;
1385 : :
1386 : : /*
1387 : : * We were already given an expression for the target, so we don't
1388 : : * have to build anything. We still have to make sure we got the right
1389 : : * type. NULL will be caught be the executor.
1390 : : */
1391 : :
1392 : 408 : result->targetRange = transformExpr(pstate,
1393 : 204 : forPortionOf->target,
1394 : : EXPR_KIND_FOR_PORTION);
1395 : :
1396 : 204 : actual_target_type = exprType(result->targetRange);
1397 : :
1398 [ + + ]: 204 : if (!can_coerce_type(1, &actual_target_type, &declared_target_type, COERCION_IMPLICIT))
1399 [ + - ]: 32 : ereport(ERROR,
1400 : : (errcode(ERRCODE_DATATYPE_MISMATCH),
1401 : : errmsg("could not coerce FOR PORTION OF target from %s to %s",
1402 : : format_type_be(actual_target_type),
1403 : : format_type_be(declared_target_type)),
1404 : : parser_errposition(pstate, exprLocation(forPortionOf->target))));
1405 : :
1406 : 172 : result->targetRange = coerce_type(pstate,
1407 : : result->targetRange,
1408 : : actual_target_type,
1409 : : declared_target_type,
1410 : : -1,
1411 : : COERCION_IMPLICIT,
1412 : : COERCE_IMPLICIT_CAST,
1413 : 172 : exprLocation(forPortionOf->target));
1414 : :
1415 : : /*
1416 : : * XXX: For now we only support ranges and multiranges, so we fail on
1417 : : * anything else.
1418 : : */
1419 [ + + + + ]: 172 : if (!type_is_range(attbasetype) && !type_is_multirange(attbasetype))
1420 [ + - ]: 24 : ereport(ERROR,
1421 : : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
1422 : : errmsg("column \"%s\" of relation \"%s\" is not a range or multirange type",
1423 : : forPortionOf->range_name,
1424 : : RelationGetRelationName(targetrel)),
1425 : : parser_errposition(pstate, forPortionOf->location)));
1426 : :
1427 : : }
1428 : : else
1429 : : {
1430 : : Oid rngsubtype;
1431 : : Oid declared_arg_types[2];
1432 : : Oid actual_arg_types[2];
1433 : : List *args;
1434 : :
1435 : : /*
1436 : : * Make sure it's a range column. XXX: We could support this syntax on
1437 : : * multirange columns too, if we just built a one-range multirange
1438 : : * from the FROM/TO phrases.
1439 : : */
1440 [ + + ]: 913 : if (!type_is_range(attbasetype))
1441 [ + - ]: 8 : ereport(ERROR,
1442 : : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
1443 : : errmsg("column \"%s\" of relation \"%s\" is not a range type",
1444 : : forPortionOf->range_name,
1445 : : RelationGetRelationName(targetrel)),
1446 : : parser_errposition(pstate, forPortionOf->location)));
1447 : :
1448 : 905 : rngsubtype = get_range_subtype(attbasetype);
1449 : 905 : declared_arg_types[0] = rngsubtype;
1450 : 905 : declared_arg_types[1] = rngsubtype;
1451 : :
1452 : : /*
1453 : : * Build a range from the FROM ... TO ... bounds. This should give a
1454 : : * constant result, so we accept functions like NOW() but not column
1455 : : * references, subqueries, etc.
1456 : : */
1457 : 1794 : result->targetFrom = transformExpr(pstate,
1458 : 905 : forPortionOf->target_start,
1459 : : EXPR_KIND_FOR_PORTION);
1460 : 1778 : result->targetTo = transformExpr(pstate,
1461 : 889 : forPortionOf->target_end,
1462 : : EXPR_KIND_FOR_PORTION);
1463 : 889 : actual_arg_types[0] = exprType(result->targetFrom);
1464 : 889 : actual_arg_types[1] = exprType(result->targetTo);
1465 : 889 : args = list_make2(copyObject(result->targetFrom),
1466 : : copyObject(result->targetTo));
1467 : :
1468 : : /*
1469 : : * Check the bound types separately, for better error message and
1470 : : * location
1471 : : */
1472 [ + + ]: 889 : if (!can_coerce_type(1, actual_arg_types, declared_arg_types, COERCION_IMPLICIT))
1473 [ + - ]: 8 : ereport(ERROR,
1474 : : (errcode(ERRCODE_DATATYPE_MISMATCH),
1475 : : errmsg("could not coerce FOR PORTION OF %s bound from %s to %s",
1476 : : "FROM",
1477 : : format_type_be(actual_arg_types[0]),
1478 : : format_type_be(declared_arg_types[0])),
1479 : : parser_errposition(pstate, exprLocation(forPortionOf->target_start))));
1480 [ + + ]: 881 : if (!can_coerce_type(1, &actual_arg_types[1], &declared_arg_types[1], COERCION_IMPLICIT))
1481 [ + - ]: 8 : ereport(ERROR,
1482 : : (errcode(ERRCODE_DATATYPE_MISMATCH),
1483 : : errmsg("could not coerce FOR PORTION OF %s bound from %s to %s",
1484 : : "TO",
1485 : : format_type_be(actual_arg_types[1]),
1486 : : format_type_be(declared_arg_types[1])),
1487 : : parser_errposition(pstate, exprLocation(forPortionOf->target_end))));
1488 : :
1489 : 873 : make_fn_arguments(pstate, args, actual_arg_types, declared_arg_types);
1490 : 873 : result->targetRange = (Node *) makeFuncExpr(get_range_constructor2(attbasetype),
1491 : : attbasetype,
1492 : : args,
1493 : : InvalidOid, InvalidOid, COERCE_EXPLICIT_CALL);
1494 : : }
1495 : :
1496 : : /*
1497 : : * Build overlapsExpr to use as an extra qual. This means we only hit rows
1498 : : * matching the FROM & TO bounds. We must look up the overlaps operator
1499 : : * (usually "&&").
1500 : : */
1501 : 1021 : opclass = GetDefaultOpClass(attr->atttypid, GIST_AM_OID);
1502 [ - + ]: 1021 : if (!OidIsValid(opclass))
1503 [ # # ]: 0 : ereport(ERROR,
1504 : : (errcode(ERRCODE_UNDEFINED_OBJECT),
1505 : : errmsg("data type %s has no default operator class for access method \"%s\"",
1506 : : format_type_be(attr->atttypid), "gist"),
1507 : : errhint("You must define a default operator class for the data type.")));
1508 : :
1509 : : /* Look up the operators and functions we need. */
1510 : 1021 : GetOperatorFromCompareType(opclass, InvalidOid, COMPARE_OVERLAP, &opid, &strat);
1511 : 1021 : op = makeNode(OpExpr);
1512 : 1021 : op->opno = opid;
1513 : 1021 : op->opfuncid = get_opcode(opid);
1514 : 1021 : op->opresulttype = BOOLOID;
1515 : 1021 : op->args = list_make2(copyObject(rangeVar), copyObject(result->targetRange));
1516 : 1021 : result->overlapsExpr = (Node *) op;
1517 : :
1518 : : /*
1519 : : * Look up the without_portion func. This computes the bounds of temporal
1520 : : * leftovers.
1521 : : *
1522 : : * XXX: Find a more extensible way to look up the function, permitting
1523 : : * user-defined types. An opclass support function doesn't make sense,
1524 : : * since there is no index involved. Perhaps a type support function.
1525 : : */
1526 [ + - ]: 1021 : if (get_opclass_opfamily_and_input_type(opclass, &opfamily, &opcintype))
1527 [ + + - ]: 1021 : switch (opcintype)
1528 : : {
1529 : 933 : case ANYRANGEOID:
1530 : 933 : result->withoutPortionProc = F_RANGE_MINUS_MULTI;
1531 : 933 : break;
1532 : 88 : case ANYMULTIRANGEOID:
1533 : 88 : result->withoutPortionProc = F_MULTIRANGE_MINUS_MULTI;
1534 : 88 : break;
1535 : 0 : default:
1536 [ # # ]: 0 : elog(ERROR, "unexpected opcintype: %u", opcintype);
1537 : : }
1538 : : else
1539 [ # # ]: 0 : elog(ERROR, "unexpected opclass: %u", opclass);
1540 : :
1541 [ + + ]: 1021 : if (isUpdate)
1542 : : {
1543 : : /*
1544 : : * Now make sure we update the start/end time of the record. For a
1545 : : * range col (r) this is `r = r * targetRange` (where * is the
1546 : : * intersect operator).
1547 : : */
1548 : : Oid intersectoperoid;
1549 : : List *funcArgs;
1550 : : Node *rangeTLEExpr;
1551 : : TargetEntry *tle;
1552 : 582 : RTEPermissionInfo *target_perminfo = pstate->p_target_nsitem->p_perminfo;
1553 : :
1554 : : /*
1555 : : * Whatever operator is used for intersect by temporal foreign keys,
1556 : : * we can use its backing procedure for intersects in FOR PORTION OF.
1557 : : * XXX: Share code with FindFKPeriodOpers?
1558 : : */
1559 [ + + - ]: 582 : switch (opcintype)
1560 : : {
1561 : 534 : case ANYRANGEOID:
1562 : 534 : intersectoperoid = OID_RANGE_INTERSECT_RANGE_OP;
1563 : 534 : break;
1564 : 48 : case ANYMULTIRANGEOID:
1565 : 48 : intersectoperoid = OID_MULTIRANGE_INTERSECT_MULTIRANGE_OP;
1566 : 48 : break;
1567 : 0 : default:
1568 [ # # ]: 0 : elog(ERROR, "unexpected opcintype: %u", opcintype);
1569 : : }
1570 : 582 : funcid = get_opcode(intersectoperoid);
1571 [ - + ]: 582 : if (!OidIsValid(funcid))
1572 [ # # ]: 0 : ereport(ERROR,
1573 : : errcode(ERRCODE_UNDEFINED_OBJECT),
1574 : : errmsg("could not identify an intersect function for type %s",
1575 : : format_type_be(opcintype)));
1576 : :
1577 : 582 : funcArgs = list_make2(copyObject(rangeVar),
1578 : : copyObject(result->targetRange));
1579 : 582 : rangeTLEExpr = (Node *) makeFuncExpr(funcid, attbasetype, funcArgs,
1580 : : InvalidOid, InvalidOid,
1581 : : COERCE_EXPLICIT_CALL);
1582 : :
1583 : : /*
1584 : : * Coerce to domain if necessary. If we skip this, we will allow
1585 : : * updating to forbidden values.
1586 : : */
1587 : 582 : rangeTLEExpr = coerce_type(pstate,
1588 : : rangeTLEExpr,
1589 : : attbasetype,
1590 : : attr->atttypid,
1591 : : -1,
1592 : : COERCION_IMPLICIT,
1593 : : COERCE_IMPLICIT_CAST,
1594 : 582 : exprLocation(forPortionOf->target));
1595 : :
1596 : : /* Make a TLE to set the range column */
1597 : 582 : result->rangeTargetList = NIL;
1598 : 582 : tle = makeTargetEntry((Expr *) rangeTLEExpr, range_attno,
1599 : 582 : forPortionOf->range_name, false);
1600 : 582 : result->rangeTargetList = lappend(result->rangeTargetList, tle);
1601 : :
1602 : : /* Mark the range column as requiring update permissions */
1603 : 582 : target_perminfo->updatedCols = bms_add_member(target_perminfo->updatedCols,
1604 : : range_attno - FirstLowInvalidHeapAttributeNumber);
1605 : : }
1606 : : else
1607 : 439 : result->rangeTargetList = NIL;
1608 : :
1609 : 1021 : result->location = forPortionOf->location;
1610 : 1021 : result->targetLocation = forPortionOf->target_location;
1611 : :
1612 : 1021 : return result;
1613 : : }
1614 : :
1615 : : /*
1616 : : * BuildOnConflictExcludedTargetlist
1617 : : * Create target list for the EXCLUDED pseudo-relation of ON CONFLICT,
1618 : : * representing the columns of targetrel with varno exclRelIndex.
1619 : : *
1620 : : * Note: Exported for use in the rewriter.
1621 : : */
1622 : : List *
1623 : 1319 : BuildOnConflictExcludedTargetlist(Relation targetrel,
1624 : : Index exclRelIndex)
1625 : : {
1626 : 1319 : List *result = NIL;
1627 : : int attno;
1628 : : Var *var;
1629 : : TargetEntry *te;
1630 : :
1631 : : /*
1632 : : * Note that resnos of the tlist must correspond to attnos of the
1633 : : * underlying relation, hence we need entries for dropped columns too.
1634 : : */
1635 [ + + ]: 4727 : for (attno = 0; attno < RelationGetNumberOfAttributes(targetrel); attno++)
1636 : : {
1637 : 3408 : Form_pg_attribute attr = TupleDescAttr(targetrel->rd_att, attno);
1638 : : char *name;
1639 : :
1640 [ + + ]: 3408 : if (attr->attisdropped)
1641 : : {
1642 : : /*
1643 : : * can't use atttypid here, but it doesn't really matter what type
1644 : : * the Const claims to be.
1645 : : */
1646 : 74 : var = (Var *) makeNullConst(INT4OID, -1, InvalidOid);
1647 : 74 : name = NULL;
1648 : : }
1649 : : else
1650 : : {
1651 : 3334 : var = makeVar(exclRelIndex, attno + 1,
1652 : : attr->atttypid, attr->atttypmod,
1653 : : attr->attcollation,
1654 : : 0);
1655 : 3334 : name = pstrdup(NameStr(attr->attname));
1656 : : }
1657 : :
1658 : 3408 : te = makeTargetEntry((Expr *) var,
1659 : 3408 : attno + 1,
1660 : : name,
1661 : : false);
1662 : :
1663 : 3408 : result = lappend(result, te);
1664 : : }
1665 : :
1666 : : /*
1667 : : * Add a whole-row-Var entry to support references to "EXCLUDED.*". Like
1668 : : * the other entries in the EXCLUDED tlist, its resno must match the Var's
1669 : : * varattno, else the wrong things happen while resolving references in
1670 : : * setrefs.c. This is against normal conventions for targetlists, but
1671 : : * it's okay since we don't use this as a real tlist.
1672 : : */
1673 : 1319 : var = makeVar(exclRelIndex, InvalidAttrNumber,
1674 : 1319 : targetrel->rd_rel->reltype,
1675 : : -1, InvalidOid, 0);
1676 : 1319 : te = makeTargetEntry((Expr *) var, InvalidAttrNumber, NULL, true);
1677 : 1319 : result = lappend(result, te);
1678 : :
1679 : 1319 : return result;
1680 : : }
1681 : :
1682 : :
1683 : : /*
1684 : : * count_rowexpr_columns -
1685 : : * get number of columns contained in a ROW() expression;
1686 : : * return -1 if expression isn't a RowExpr or a Var referencing one.
1687 : : *
1688 : : * This is currently used only for hint purposes, so we aren't terribly
1689 : : * tense about recognizing all possible cases. The Var case is interesting
1690 : : * because that's what we'll get in the INSERT ... SELECT (...) case.
1691 : : */
1692 : : static int
1693 : 0 : count_rowexpr_columns(ParseState *pstate, Node *expr)
1694 : : {
1695 [ # # ]: 0 : if (expr == NULL)
1696 : 0 : return -1;
1697 [ # # ]: 0 : if (IsA(expr, RowExpr))
1698 : 0 : return list_length(((RowExpr *) expr)->args);
1699 [ # # ]: 0 : if (IsA(expr, Var))
1700 : : {
1701 : 0 : Var *var = (Var *) expr;
1702 : 0 : AttrNumber attnum = var->varattno;
1703 : :
1704 [ # # # # ]: 0 : if (attnum > 0 && var->vartype == RECORDOID)
1705 : : {
1706 : : RangeTblEntry *rte;
1707 : :
1708 : 0 : rte = GetRTEByRangeTablePosn(pstate, var->varno, var->varlevelsup);
1709 [ # # ]: 0 : if (rte->rtekind == RTE_SUBQUERY)
1710 : : {
1711 : : /* Subselect-in-FROM: examine sub-select's output expr */
1712 : 0 : TargetEntry *ste = get_tle_by_resno(rte->subquery->targetList,
1713 : : attnum);
1714 : :
1715 [ # # # # ]: 0 : if (ste == NULL || ste->resjunk)
1716 : 0 : return -1;
1717 : 0 : expr = (Node *) ste->expr;
1718 [ # # ]: 0 : if (IsA(expr, RowExpr))
1719 : 0 : return list_length(((RowExpr *) expr)->args);
1720 : : }
1721 : : }
1722 : : }
1723 : 0 : return -1;
1724 : : }
1725 : :
1726 : :
1727 : : /*
1728 : : * transformSelectStmt -
1729 : : * transforms a Select Statement
1730 : : *
1731 : : * This function is also used to transform the source expression of a
1732 : : * PLAssignStmt. In that usage, passthru is non-NULL and we need to
1733 : : * call transformPLAssignStmtTarget after the initial transformation of the
1734 : : * SELECT's targetlist. (We could generalize this into an arbitrary callback
1735 : : * function, but for now that would just be more notation with no benefit.)
1736 : : * All the rest is the same as a regular SelectStmt.
1737 : : *
1738 : : * Note: this covers only cases with no set operations and no VALUES lists;
1739 : : * see below for the other cases.
1740 : : */
1741 : : static Query *
1742 : 307237 : transformSelectStmt(ParseState *pstate, SelectStmt *stmt,
1743 : : SelectStmtPassthrough *passthru)
1744 : : {
1745 : 307237 : Query *qry = makeNode(Query);
1746 : : Node *qual;
1747 : : ListCell *l;
1748 : :
1749 : 307237 : qry->commandType = CMD_SELECT;
1750 : :
1751 : : /* process the WITH clause independently of all else */
1752 [ + + ]: 307237 : if (stmt->withClause)
1753 : : {
1754 : 1662 : qry->hasRecursive = stmt->withClause->recursive;
1755 : 1662 : qry->cteList = transformWithClause(pstate, stmt->withClause);
1756 : 1465 : qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
1757 : : }
1758 : :
1759 : : /* Complain if we get called from someplace where INTO is not allowed */
1760 [ + + ]: 307040 : if (stmt->intoClause)
1761 [ + - ]: 12 : ereport(ERROR,
1762 : : (errcode(ERRCODE_SYNTAX_ERROR),
1763 : : errmsg("SELECT ... INTO is not allowed here"),
1764 : : parser_errposition(pstate,
1765 : : exprLocation((Node *) stmt->intoClause))));
1766 : :
1767 : : /* make FOR UPDATE/FOR SHARE info available to addRangeTableEntry */
1768 : 307028 : pstate->p_locking_clause = stmt->lockingClause;
1769 : :
1770 : : /* make WINDOW info available for window functions, too */
1771 : 307028 : pstate->p_windowdefs = stmt->windowClause;
1772 : :
1773 : : /* process the FROM clause */
1774 : 307028 : transformFromClause(pstate, stmt->fromClause);
1775 : :
1776 : : /* transform targetlist */
1777 : 306487 : qry->targetList = transformTargetList(pstate, stmt->targetList,
1778 : : EXPR_KIND_SELECT_TARGET);
1779 : :
1780 : : /*
1781 : : * If we're within a PLAssignStmt, do further transformation of the
1782 : : * targetlist; that has to happen before we consider sorting or grouping.
1783 : : * Otherwise, mark column origins (which are useless in a PLAssignStmt).
1784 : : */
1785 [ + + ]: 302815 : if (passthru)
1786 : 3340 : qry->targetList = transformPLAssignStmtTarget(pstate, qry->targetList,
1787 : : passthru);
1788 : : else
1789 : 299475 : markTargetListOrigins(pstate, qry->targetList);
1790 : :
1791 : : /* transform WHERE */
1792 : 302808 : qual = transformWhereClause(pstate, stmt->whereClause,
1793 : : EXPR_KIND_WHERE, "WHERE");
1794 : :
1795 : : /* initial processing of HAVING clause is much like WHERE clause */
1796 : 302737 : qry->havingQual = transformWhereClause(pstate, stmt->havingClause,
1797 : : EXPR_KIND_HAVING, "HAVING");
1798 : :
1799 : : /*
1800 : : * Transform sorting/grouping stuff. Do ORDER BY first because both
1801 : : * transformGroupClause and transformDistinctClause need the results. Note
1802 : : * that these functions can also change the targetList, so it's passed to
1803 : : * them by reference.
1804 : : */
1805 : 302733 : qry->sortClause = transformSortClause(pstate,
1806 : : stmt->sortClause,
1807 : : &qry->targetList,
1808 : : EXPR_KIND_ORDER_BY,
1809 : : false /* allow SQL92 rules */ );
1810 : :
1811 : 302713 : qry->groupClause = transformGroupClause(pstate,
1812 : : stmt->groupClause,
1813 : : &qry->groupingSets,
1814 : : &qry->targetList,
1815 : : qry->sortClause,
1816 : : EXPR_KIND_GROUP_BY,
1817 : : false /* allow SQL92 rules */ );
1818 : 302697 : qry->groupDistinct = stmt->groupDistinct;
1819 : :
1820 [ + + ]: 302697 : if (stmt->distinctClause == NIL)
1821 : : {
1822 : 300170 : qry->distinctClause = NIL;
1823 : 300170 : qry->hasDistinctOn = false;
1824 : : }
1825 [ + + ]: 2527 : else if (linitial(stmt->distinctClause) == NULL)
1826 : : {
1827 : : /* We had SELECT DISTINCT */
1828 : 2328 : qry->distinctClause = transformDistinctClause(pstate,
1829 : : &qry->targetList,
1830 : : qry->sortClause,
1831 : : false);
1832 : 2328 : qry->hasDistinctOn = false;
1833 : : }
1834 : : else
1835 : : {
1836 : : /* We had SELECT DISTINCT ON */
1837 : 199 : qry->distinctClause = transformDistinctOnClause(pstate,
1838 : : stmt->distinctClause,
1839 : : &qry->targetList,
1840 : : qry->sortClause);
1841 : 191 : qry->hasDistinctOn = true;
1842 : : }
1843 : :
1844 : : /* transform LIMIT */
1845 : 302689 : qry->limitOffset = transformLimitClause(pstate, stmt->limitOffset,
1846 : : EXPR_KIND_OFFSET, "OFFSET",
1847 : : stmt->limitOption);
1848 : 302689 : qry->limitCount = transformLimitClause(pstate, stmt->limitCount,
1849 : : EXPR_KIND_LIMIT, "LIMIT",
1850 : : stmt->limitOption);
1851 : 302681 : qry->limitOption = stmt->limitOption;
1852 : :
1853 : : /* transform window clauses after we have seen all window functions */
1854 : 302681 : qry->windowClause = transformWindowDefinitions(pstate,
1855 : : pstate->p_windowdefs,
1856 : : &qry->targetList);
1857 : :
1858 : : /* resolve any still-unresolved output columns as being type text */
1859 [ + + ]: 302625 : if (pstate->p_resolve_unknowns)
1860 : 275530 : resolveTargetListUnknowns(pstate, qry->targetList);
1861 : :
1862 : 302625 : qry->rtable = pstate->p_rtable;
1863 : 302625 : qry->rteperminfos = pstate->p_rteperminfos;
1864 : 302625 : qry->jointree = makeFromExpr(pstate->p_joinlist, qual);
1865 : :
1866 : 302625 : qry->hasSubLinks = pstate->p_hasSubLinks;
1867 : 302625 : qry->hasWindowFuncs = pstate->p_hasWindowFuncs;
1868 : 302625 : qry->hasTargetSRFs = pstate->p_hasTargetSRFs;
1869 : 302625 : qry->hasAggs = pstate->p_hasAggs;
1870 : :
1871 [ + + + + : 307629 : foreach(l, stmt->lockingClause)
+ + ]
1872 : : {
1873 : 5036 : transformLockingClause(pstate, qry,
1874 : 5036 : (LockingClause *) lfirst(l), false);
1875 : : }
1876 : :
1877 : 302593 : assign_query_collations(pstate, qry);
1878 : :
1879 : : /* this must be done after collations, for reliable comparison of exprs */
1880 [ + + + + : 302565 : if (pstate->p_hasAggs || qry->groupClause || qry->groupingSets || qry->havingQual)
+ + + + ]
1881 : 27605 : parseCheckAggregates(pstate, qry);
1882 : :
1883 : 302493 : return qry;
1884 : : }
1885 : :
1886 : : /*
1887 : : * transformValuesClause -
1888 : : * transforms a VALUES clause that's being used as a standalone SELECT
1889 : : *
1890 : : * We build a Query containing a VALUES RTE, rather as if one had written
1891 : : * SELECT * FROM (VALUES ...) AS "*VALUES*"
1892 : : */
1893 : : static Query *
1894 : 5839 : transformValuesClause(ParseState *pstate, SelectStmt *stmt)
1895 : : {
1896 : 5839 : Query *qry = makeNode(Query);
1897 : 5839 : List *exprsLists = NIL;
1898 : 5839 : List *coltypes = NIL;
1899 : 5839 : List *coltypmods = NIL;
1900 : 5839 : List *colcollations = NIL;
1901 : 5839 : List **colexprs = NULL;
1902 : 5839 : int sublist_length = -1;
1903 : 5839 : bool lateral = false;
1904 : : ParseNamespaceItem *nsitem;
1905 : : ListCell *lc;
1906 : : ListCell *lc2;
1907 : : int i;
1908 : :
1909 : 5839 : qry->commandType = CMD_SELECT;
1910 : :
1911 : : /* Most SELECT stuff doesn't apply in a VALUES clause */
1912 : : Assert(stmt->distinctClause == NIL);
1913 : : Assert(stmt->intoClause == NULL);
1914 : : Assert(stmt->targetList == NIL);
1915 : : Assert(stmt->fromClause == NIL);
1916 : : Assert(stmt->whereClause == NULL);
1917 : : Assert(stmt->groupClause == NIL);
1918 : : Assert(stmt->havingClause == NULL);
1919 : : Assert(stmt->windowClause == NIL);
1920 : : Assert(stmt->op == SETOP_NONE);
1921 : :
1922 : : /* process the WITH clause independently of all else */
1923 [ + + ]: 5839 : if (stmt->withClause)
1924 : : {
1925 : 40 : qry->hasRecursive = stmt->withClause->recursive;
1926 : 40 : qry->cteList = transformWithClause(pstate, stmt->withClause);
1927 : 36 : qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
1928 : : }
1929 : :
1930 : : /*
1931 : : * For each row of VALUES, transform the raw expressions.
1932 : : *
1933 : : * Note that the intermediate representation we build is column-organized
1934 : : * not row-organized. That simplifies the type and collation processing
1935 : : * below.
1936 : : */
1937 [ + - + + : 21674 : foreach(lc, stmt->valuesLists)
+ + ]
1938 : : {
1939 : 15844 : List *sublist = (List *) lfirst(lc);
1940 : :
1941 : : /*
1942 : : * Do basic expression transformation (same as a ROW() expr, but here
1943 : : * we disallow SetToDefault)
1944 : : */
1945 : 15844 : sublist = transformExpressionList(pstate, sublist,
1946 : : EXPR_KIND_VALUES, false);
1947 : :
1948 : : /*
1949 : : * All the sublists must be the same length, *after* transformation
1950 : : * (which might expand '*' into multiple items). The VALUES RTE can't
1951 : : * handle anything different.
1952 : : */
1953 [ + + ]: 15839 : if (sublist_length < 0)
1954 : : {
1955 : : /* Remember post-transformation length of first sublist */
1956 : 5830 : sublist_length = list_length(sublist);
1957 : : /* and allocate array for per-column lists */
1958 : 5830 : colexprs = (List **) palloc0(sublist_length * sizeof(List *));
1959 : : }
1960 [ - + ]: 10009 : else if (sublist_length != list_length(sublist))
1961 : : {
1962 [ # # ]: 0 : ereport(ERROR,
1963 : : (errcode(ERRCODE_SYNTAX_ERROR),
1964 : : errmsg("VALUES lists must all be the same length"),
1965 : : parser_errposition(pstate,
1966 : : exprLocation((Node *) sublist))));
1967 : : }
1968 : :
1969 : : /* Build per-column expression lists */
1970 : 15839 : i = 0;
1971 [ + + + + : 37812 : foreach(lc2, sublist)
+ + ]
1972 : : {
1973 : 21973 : Node *col = (Node *) lfirst(lc2);
1974 : :
1975 : 21973 : colexprs[i] = lappend(colexprs[i], col);
1976 : 21973 : i++;
1977 : : }
1978 : :
1979 : : /* Release sub-list's cells to save memory */
1980 : 15839 : list_free(sublist);
1981 : :
1982 : : /* Prepare an exprsLists element for this row */
1983 : 15839 : exprsLists = lappend(exprsLists, NIL);
1984 : : }
1985 : :
1986 : : /*
1987 : : * Now resolve the common types of the columns, and coerce everything to
1988 : : * those types. Then identify the common typmod and common collation, if
1989 : : * any, of each column.
1990 : : *
1991 : : * We must do collation processing now because (1) assign_query_collations
1992 : : * doesn't process rangetable entries, and (2) we need to label the VALUES
1993 : : * RTE with column collations for use in the outer query. We don't
1994 : : * consider conflict of implicit collations to be an error here; instead
1995 : : * the column will just show InvalidOid as its collation, and you'll get a
1996 : : * failure later if that results in failure to resolve a collation.
1997 : : *
1998 : : * Note we modify the per-column expression lists in-place.
1999 : : */
2000 [ + + ]: 13431 : for (i = 0; i < sublist_length; i++)
2001 : : {
2002 : : Oid coltype;
2003 : : int32 coltypmod;
2004 : : Oid colcoll;
2005 : :
2006 : 7601 : coltype = select_common_type(pstate, colexprs[i], "VALUES", NULL);
2007 : :
2008 [ + - + + : 29574 : foreach(lc, colexprs[i])
+ + ]
2009 : : {
2010 : 21973 : Node *col = (Node *) lfirst(lc);
2011 : :
2012 : 21973 : col = coerce_to_common_type(pstate, col, coltype, "VALUES");
2013 : 21973 : lfirst(lc) = col;
2014 : : }
2015 : :
2016 : 7601 : coltypmod = select_common_typmod(pstate, colexprs[i], coltype);
2017 : 7601 : colcoll = select_common_collation(pstate, colexprs[i], true);
2018 : :
2019 : 7601 : coltypes = lappend_oid(coltypes, coltype);
2020 : 7601 : coltypmods = lappend_int(coltypmods, coltypmod);
2021 : 7601 : colcollations = lappend_oid(colcollations, colcoll);
2022 : : }
2023 : :
2024 : : /*
2025 : : * Finally, rearrange the coerced expressions into row-organized lists.
2026 : : */
2027 [ + + ]: 13431 : for (i = 0; i < sublist_length; i++)
2028 : : {
2029 [ + - + + : 29574 : forboth(lc, colexprs[i], lc2, exprsLists)
+ - + + +
+ + - +
+ ]
2030 : : {
2031 : 21973 : Node *col = (Node *) lfirst(lc);
2032 : 21973 : List *sublist = lfirst(lc2);
2033 : :
2034 : 21973 : sublist = lappend(sublist, col);
2035 : 21973 : lfirst(lc2) = sublist;
2036 : : }
2037 : 7601 : list_free(colexprs[i]);
2038 : : }
2039 : :
2040 : : /*
2041 : : * Ordinarily there can't be any current-level Vars in the expression
2042 : : * lists, because the namespace was empty ... but if we're inside CREATE
2043 : : * RULE, then NEW/OLD references might appear. In that case we have to
2044 : : * mark the VALUES RTE as LATERAL.
2045 : : */
2046 [ + + + - ]: 5835 : if (pstate->p_rtable != NIL &&
2047 : 5 : contain_vars_of_level((Node *) exprsLists, 0))
2048 : 5 : lateral = true;
2049 : :
2050 : : /*
2051 : : * Generate the VALUES RTE
2052 : : */
2053 : 5830 : nsitem = addRangeTableEntryForValues(pstate, exprsLists,
2054 : : coltypes, coltypmods, colcollations,
2055 : : NULL, lateral, true);
2056 : 5830 : addNSItemToQuery(pstate, nsitem, true, true, true);
2057 : :
2058 : : /*
2059 : : * Generate a targetlist as though expanding "*"
2060 : : */
2061 : : Assert(pstate->p_next_resno == 1);
2062 : 5830 : qry->targetList = expandNSItemAttrs(pstate, nsitem, 0, true, -1);
2063 : :
2064 : : /*
2065 : : * The grammar allows attaching ORDER BY, LIMIT, and FOR UPDATE to a
2066 : : * VALUES, so cope.
2067 : : */
2068 : 5830 : qry->sortClause = transformSortClause(pstate,
2069 : : stmt->sortClause,
2070 : : &qry->targetList,
2071 : : EXPR_KIND_ORDER_BY,
2072 : : false /* allow SQL92 rules */ );
2073 : :
2074 : 5830 : qry->limitOffset = transformLimitClause(pstate, stmt->limitOffset,
2075 : : EXPR_KIND_OFFSET, "OFFSET",
2076 : : stmt->limitOption);
2077 : 5830 : qry->limitCount = transformLimitClause(pstate, stmt->limitCount,
2078 : : EXPR_KIND_LIMIT, "LIMIT",
2079 : : stmt->limitOption);
2080 : 5830 : qry->limitOption = stmt->limitOption;
2081 : :
2082 [ - + ]: 5830 : if (stmt->lockingClause)
2083 [ # # ]: 0 : ereport(ERROR,
2084 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2085 : : /*------
2086 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
2087 : : errmsg("%s cannot be applied to VALUES",
2088 : : LCS_asString(((LockingClause *)
2089 : : linitial(stmt->lockingClause))->strength))));
2090 : :
2091 : 5830 : qry->rtable = pstate->p_rtable;
2092 : 5830 : qry->rteperminfos = pstate->p_rteperminfos;
2093 : 5830 : qry->jointree = makeFromExpr(pstate->p_joinlist, NULL);
2094 : :
2095 : 5830 : qry->hasSubLinks = pstate->p_hasSubLinks;
2096 : :
2097 : 5830 : assign_query_collations(pstate, qry);
2098 : :
2099 : 5830 : return qry;
2100 : : }
2101 : :
2102 : : /*
2103 : : * transformSetOperationStmt -
2104 : : * transforms a set-operations tree
2105 : : *
2106 : : * A set-operation tree is just a SELECT, but with UNION/INTERSECT/EXCEPT
2107 : : * structure to it. We must transform each leaf SELECT and build up a top-
2108 : : * level Query that contains the leaf SELECTs as subqueries in its rangetable.
2109 : : * The tree of set operations is converted into the setOperations field of
2110 : : * the top-level Query.
2111 : : */
2112 : : static Query *
2113 : 8575 : transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
2114 : : {
2115 : 8575 : Query *qry = makeNode(Query);
2116 : : SelectStmt *leftmostSelect;
2117 : : int leftmostRTI;
2118 : : Query *leftmostQuery;
2119 : : SetOperationStmt *sostmt;
2120 : : List *sortClause;
2121 : : Node *limitOffset;
2122 : : Node *limitCount;
2123 : : List *lockingClause;
2124 : : WithClause *withClause;
2125 : : Node *node;
2126 : : ListCell *left_tlist,
2127 : : *lct,
2128 : : *lcm,
2129 : : *lcc,
2130 : : *l;
2131 : : List *targetvars,
2132 : : *targetnames,
2133 : : *sv_namespace;
2134 : : int sv_rtable_length;
2135 : : ParseNamespaceItem *jnsitem;
2136 : : ParseNamespaceColumn *sortnscolumns;
2137 : : int sortcolindex;
2138 : : int tllen;
2139 : :
2140 : 8575 : qry->commandType = CMD_SELECT;
2141 : :
2142 : : /*
2143 : : * Find leftmost leaf SelectStmt. We currently only need to do this in
2144 : : * order to deliver a suitable error message if there's an INTO clause
2145 : : * there, implying the set-op tree is in a context that doesn't allow
2146 : : * INTO. (transformSetOperationTree would throw error anyway, but it
2147 : : * seems worth the trouble to throw a different error for non-leftmost
2148 : : * INTO, so we produce that error in transformSetOperationTree.)
2149 : : */
2150 : 8575 : leftmostSelect = stmt->larg;
2151 [ + - + + ]: 12888 : while (leftmostSelect && leftmostSelect->op != SETOP_NONE)
2152 : 4313 : leftmostSelect = leftmostSelect->larg;
2153 : : Assert(leftmostSelect && IsA(leftmostSelect, SelectStmt) &&
2154 : : leftmostSelect->larg == NULL);
2155 [ - + ]: 8575 : if (leftmostSelect->intoClause)
2156 [ # # ]: 0 : ereport(ERROR,
2157 : : (errcode(ERRCODE_SYNTAX_ERROR),
2158 : : errmsg("SELECT ... INTO is not allowed here"),
2159 : : parser_errposition(pstate,
2160 : : exprLocation((Node *) leftmostSelect->intoClause))));
2161 : :
2162 : : /*
2163 : : * We need to extract ORDER BY and other top-level clauses here and not
2164 : : * let transformSetOperationTree() see them --- else it'll just recurse
2165 : : * right back here!
2166 : : */
2167 : 8575 : sortClause = stmt->sortClause;
2168 : 8575 : limitOffset = stmt->limitOffset;
2169 : 8575 : limitCount = stmt->limitCount;
2170 : 8575 : lockingClause = stmt->lockingClause;
2171 : 8575 : withClause = stmt->withClause;
2172 : :
2173 : 8575 : stmt->sortClause = NIL;
2174 : 8575 : stmt->limitOffset = NULL;
2175 : 8575 : stmt->limitCount = NULL;
2176 : 8575 : stmt->lockingClause = NIL;
2177 : 8575 : stmt->withClause = NULL;
2178 : :
2179 : : /* We don't support FOR UPDATE/SHARE with set ops at the moment. */
2180 [ + + ]: 8575 : if (lockingClause)
2181 [ + - ]: 4 : ereport(ERROR,
2182 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2183 : : /*------
2184 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
2185 : : errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT",
2186 : : LCS_asString(((LockingClause *)
2187 : : linitial(lockingClause))->strength))));
2188 : :
2189 : : /* Process the WITH clause independently of all else */
2190 [ + + ]: 8571 : if (withClause)
2191 : : {
2192 : 170 : qry->hasRecursive = withClause->recursive;
2193 : 170 : qry->cteList = transformWithClause(pstate, withClause);
2194 : 170 : qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
2195 : : }
2196 : :
2197 : : /*
2198 : : * Recursively transform the components of the tree.
2199 : : */
2200 : 8571 : sostmt = castNode(SetOperationStmt,
2201 : : transformSetOperationTree(pstate, stmt, true, NULL));
2202 : : Assert(sostmt);
2203 : 8523 : qry->setOperations = (Node *) sostmt;
2204 : :
2205 : : /*
2206 : : * Re-find leftmost SELECT (now it's a sub-query in rangetable)
2207 : : */
2208 : 8523 : node = sostmt->larg;
2209 [ + - + + ]: 12824 : while (node && IsA(node, SetOperationStmt))
2210 : 4301 : node = ((SetOperationStmt *) node)->larg;
2211 : : Assert(node && IsA(node, RangeTblRef));
2212 : 8523 : leftmostRTI = ((RangeTblRef *) node)->rtindex;
2213 : 8523 : leftmostQuery = rt_fetch(leftmostRTI, pstate->p_rtable)->subquery;
2214 : : Assert(leftmostQuery != NULL);
2215 : :
2216 : : /*
2217 : : * Generate dummy targetlist for outer query using column names of
2218 : : * leftmost select and common datatypes/collations of topmost set
2219 : : * operation. Also make lists of the dummy vars and their names for use
2220 : : * in parsing ORDER BY.
2221 : : *
2222 : : * Note: we use leftmostRTI as the varno of the dummy variables. It
2223 : : * shouldn't matter too much which RT index they have, as long as they
2224 : : * have one that corresponds to a real RT entry; else funny things may
2225 : : * happen when the tree is mashed by rule rewriting.
2226 : : */
2227 : 8523 : qry->targetList = NIL;
2228 : 8523 : targetvars = NIL;
2229 : 8523 : targetnames = NIL;
2230 : : sortnscolumns = (ParseNamespaceColumn *)
2231 : 8523 : palloc0(list_length(sostmt->colTypes) * sizeof(ParseNamespaceColumn));
2232 : 8523 : sortcolindex = 0;
2233 : :
2234 [ + + + + : 29070 : forfour(lct, sostmt->colTypes,
+ + + + +
+ + + + +
+ + + + +
- + - + -
+ + ]
2235 : : lcm, sostmt->colTypmods,
2236 : : lcc, sostmt->colCollations,
2237 : : left_tlist, leftmostQuery->targetList)
2238 : : {
2239 : 20547 : Oid colType = lfirst_oid(lct);
2240 : 20547 : int32 colTypmod = lfirst_int(lcm);
2241 : 20547 : Oid colCollation = lfirst_oid(lcc);
2242 : 20547 : TargetEntry *lefttle = (TargetEntry *) lfirst(left_tlist);
2243 : : char *colName;
2244 : : TargetEntry *tle;
2245 : : Var *var;
2246 : :
2247 : : Assert(!lefttle->resjunk);
2248 : 20547 : colName = pstrdup(lefttle->resname);
2249 : 20547 : var = makeVar(leftmostRTI,
2250 : 20547 : lefttle->resno,
2251 : : colType,
2252 : : colTypmod,
2253 : : colCollation,
2254 : : 0);
2255 : 20547 : var->location = exprLocation((Node *) lefttle->expr);
2256 : 20547 : tle = makeTargetEntry((Expr *) var,
2257 : 20547 : (AttrNumber) pstate->p_next_resno++,
2258 : : colName,
2259 : : false);
2260 : 20547 : qry->targetList = lappend(qry->targetList, tle);
2261 : 20547 : targetvars = lappend(targetvars, var);
2262 : 20547 : targetnames = lappend(targetnames, makeString(colName));
2263 : 20547 : sortnscolumns[sortcolindex].p_varno = leftmostRTI;
2264 : 20547 : sortnscolumns[sortcolindex].p_varattno = lefttle->resno;
2265 : 20547 : sortnscolumns[sortcolindex].p_vartype = colType;
2266 : 20547 : sortnscolumns[sortcolindex].p_vartypmod = colTypmod;
2267 : 20547 : sortnscolumns[sortcolindex].p_varcollid = colCollation;
2268 : 20547 : sortnscolumns[sortcolindex].p_varnosyn = leftmostRTI;
2269 : 20547 : sortnscolumns[sortcolindex].p_varattnosyn = lefttle->resno;
2270 : 20547 : sortcolindex++;
2271 : : }
2272 : :
2273 : : /*
2274 : : * As a first step towards supporting sort clauses that are expressions
2275 : : * using the output columns, generate a namespace entry that makes the
2276 : : * output columns visible. A Join RTE node is handy for this, since we
2277 : : * can easily control the Vars generated upon matches.
2278 : : *
2279 : : * Note: we don't yet do anything useful with such cases, but at least
2280 : : * "ORDER BY upper(foo)" will draw the right error message rather than
2281 : : * "foo not found".
2282 : : */
2283 : 8523 : sv_rtable_length = list_length(pstate->p_rtable);
2284 : :
2285 : 8523 : jnsitem = addRangeTableEntryForJoin(pstate,
2286 : : targetnames,
2287 : : sortnscolumns,
2288 : : JOIN_INNER,
2289 : : 0,
2290 : : targetvars,
2291 : : NIL,
2292 : : NIL,
2293 : : NULL,
2294 : : NULL,
2295 : : false);
2296 : :
2297 : 8523 : sv_namespace = pstate->p_namespace;
2298 : 8523 : pstate->p_namespace = NIL;
2299 : :
2300 : : /* add jnsitem to column namespace only */
2301 : 8523 : addNSItemToQuery(pstate, jnsitem, false, false, true);
2302 : :
2303 : : /*
2304 : : * For now, we don't support resjunk sort clauses on the output of a
2305 : : * setOperation tree --- you can only use the SQL92-spec options of
2306 : : * selecting an output column by name or number. Enforce by checking that
2307 : : * transformSortClause doesn't add any items to tlist. Note, if changing
2308 : : * this, add_setop_child_rel_equivalences() will need to be updated.
2309 : : */
2310 : 8523 : tllen = list_length(qry->targetList);
2311 : :
2312 : 8523 : qry->sortClause = transformSortClause(pstate,
2313 : : sortClause,
2314 : : &qry->targetList,
2315 : : EXPR_KIND_ORDER_BY,
2316 : : false /* allow SQL92 rules */ );
2317 : :
2318 : : /* restore namespace, remove join RTE from rtable */
2319 : 8519 : pstate->p_namespace = sv_namespace;
2320 : 8519 : pstate->p_rtable = list_truncate(pstate->p_rtable, sv_rtable_length);
2321 : :
2322 [ - + ]: 8519 : if (tllen != list_length(qry->targetList))
2323 [ # # ]: 0 : ereport(ERROR,
2324 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2325 : : errmsg("invalid UNION/INTERSECT/EXCEPT ORDER BY clause"),
2326 : : errdetail("Only result column names can be used, not expressions or functions."),
2327 : : errhint("Add the expression/function to every SELECT, or move the UNION into a FROM clause."),
2328 : : parser_errposition(pstate,
2329 : : exprLocation(list_nth(qry->targetList, tllen)))));
2330 : :
2331 : 8519 : qry->limitOffset = transformLimitClause(pstate, limitOffset,
2332 : : EXPR_KIND_OFFSET, "OFFSET",
2333 : : stmt->limitOption);
2334 : 8519 : qry->limitCount = transformLimitClause(pstate, limitCount,
2335 : : EXPR_KIND_LIMIT, "LIMIT",
2336 : : stmt->limitOption);
2337 : 8519 : qry->limitOption = stmt->limitOption;
2338 : :
2339 : 8519 : qry->rtable = pstate->p_rtable;
2340 : 8519 : qry->rteperminfos = pstate->p_rteperminfos;
2341 : 8519 : qry->jointree = makeFromExpr(pstate->p_joinlist, NULL);
2342 : :
2343 : 8519 : qry->hasSubLinks = pstate->p_hasSubLinks;
2344 : 8519 : qry->hasWindowFuncs = pstate->p_hasWindowFuncs;
2345 : 8519 : qry->hasTargetSRFs = pstate->p_hasTargetSRFs;
2346 : 8519 : qry->hasAggs = pstate->p_hasAggs;
2347 : :
2348 [ - + - - : 8519 : foreach(l, lockingClause)
- + ]
2349 : : {
2350 : 0 : transformLockingClause(pstate, qry,
2351 : 0 : (LockingClause *) lfirst(l), false);
2352 : : }
2353 : :
2354 : 8519 : assign_query_collations(pstate, qry);
2355 : :
2356 : : /* this must be done after collations, for reliable comparison of exprs */
2357 [ + - + - : 8519 : if (pstate->p_hasAggs || qry->groupClause || qry->groupingSets || qry->havingQual)
+ - - + ]
2358 : 0 : parseCheckAggregates(pstate, qry);
2359 : :
2360 : 8519 : return qry;
2361 : : }
2362 : :
2363 : : /*
2364 : : * Make a SortGroupClause node for a SetOperationStmt's groupClauses
2365 : : *
2366 : : * If require_hash is true, the caller is indicating that they need hash
2367 : : * support or they will fail. So look extra hard for hash support.
2368 : : */
2369 : : SortGroupClause *
2370 : 17542 : makeSortGroupClauseForSetOp(Oid rescoltype, bool require_hash)
2371 : : {
2372 : 17542 : SortGroupClause *grpcl = makeNode(SortGroupClause);
2373 : : Oid sortop;
2374 : : Oid eqop;
2375 : : bool hashable;
2376 : :
2377 : : /* determine the eqop and optional sortop */
2378 : 17542 : get_sort_group_operators(rescoltype,
2379 : : false, true, false,
2380 : : &sortop, &eqop, NULL,
2381 : : &hashable);
2382 : :
2383 : : /*
2384 : : * The type cache doesn't believe that record is hashable (see
2385 : : * cache_record_field_properties()), but if the caller really needs hash
2386 : : * support, we can assume it does. Worst case, if any components of the
2387 : : * record don't support hashing, we will fail at execution.
2388 : : */
2389 [ + + + + : 17542 : if (require_hash && (rescoltype == RECORDOID || rescoltype == RECORDARRAYOID))
+ + ]
2390 : 16 : hashable = true;
2391 : :
2392 : : /* we don't have a tlist yet, so can't assign sortgrouprefs */
2393 : 17542 : grpcl->tleSortGroupRef = 0;
2394 : 17542 : grpcl->eqop = eqop;
2395 : 17542 : grpcl->sortop = sortop;
2396 : 17542 : grpcl->reverse_sort = false; /* Sort-op is "less than", or InvalidOid */
2397 : 17542 : grpcl->nulls_first = false; /* OK with or without sortop */
2398 : 17542 : grpcl->hashable = hashable;
2399 : :
2400 : 17542 : return grpcl;
2401 : : }
2402 : :
2403 : : /*
2404 : : * transformSetOperationTree
2405 : : * Recursively transform leaves and internal nodes of a set-op tree
2406 : : *
2407 : : * In addition to returning the transformed node, if targetlist isn't NULL
2408 : : * then we return a list of its non-resjunk TargetEntry nodes. For a leaf
2409 : : * set-op node these are the actual targetlist entries; otherwise they are
2410 : : * dummy entries created to carry the type, typmod, collation, and location
2411 : : * (for error messages) of each output column of the set-op node. This info
2412 : : * is needed only during the internal recursion of this function, so outside
2413 : : * callers pass NULL for targetlist. Note: the reason for passing the
2414 : : * actual targetlist entries of a leaf node is so that upper levels can
2415 : : * replace UNKNOWN Consts with properly-coerced constants.
2416 : : */
2417 : : static Node *
2418 : 34415 : transformSetOperationTree(ParseState *pstate, SelectStmt *stmt,
2419 : : bool isTopLevel, List **targetlist)
2420 : : {
2421 : : bool isLeaf;
2422 : :
2423 : : Assert(stmt && IsA(stmt, SelectStmt));
2424 : :
2425 : : /* Guard against stack overflow due to overly complex set-expressions */
2426 : 34415 : check_stack_depth();
2427 : :
2428 : : /*
2429 : : * Validity-check both leaf and internal SELECTs for disallowed ops.
2430 : : */
2431 [ - + ]: 34415 : if (stmt->intoClause)
2432 [ # # ]: 0 : ereport(ERROR,
2433 : : (errcode(ERRCODE_SYNTAX_ERROR),
2434 : : errmsg("INTO is only allowed on first SELECT of UNION/INTERSECT/EXCEPT"),
2435 : : parser_errposition(pstate,
2436 : : exprLocation((Node *) stmt->intoClause))));
2437 : :
2438 : : /* We don't support FOR UPDATE/SHARE with set ops at the moment. */
2439 [ - + ]: 34415 : if (stmt->lockingClause)
2440 [ # # ]: 0 : ereport(ERROR,
2441 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2442 : : /*------
2443 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
2444 : : errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT",
2445 : : LCS_asString(((LockingClause *)
2446 : : linitial(stmt->lockingClause))->strength))));
2447 : :
2448 : : /*
2449 : : * If an internal node of a set-op tree has ORDER BY, LIMIT, FOR UPDATE,
2450 : : * or WITH clauses attached, we need to treat it like a leaf node to
2451 : : * generate an independent sub-Query tree. Otherwise, it can be
2452 : : * represented by a SetOperationStmt node underneath the parent Query.
2453 : : */
2454 [ + + ]: 34415 : if (stmt->op == SETOP_NONE)
2455 : : {
2456 : : Assert(stmt->larg == NULL && stmt->rarg == NULL);
2457 : 21451 : isLeaf = true;
2458 : : }
2459 : : else
2460 : : {
2461 : : Assert(stmt->larg != NULL && stmt->rarg != NULL);
2462 [ + + + - : 12964 : if (stmt->sortClause || stmt->limitOffset || stmt->limitCount ||
+ - ]
2463 [ + - + + ]: 12948 : stmt->lockingClause || stmt->withClause)
2464 : 40 : isLeaf = true;
2465 : : else
2466 : 12924 : isLeaf = false;
2467 : : }
2468 : :
2469 [ + + ]: 34415 : if (isLeaf)
2470 : : {
2471 : : /* Process leaf SELECT */
2472 : : Query *selectQuery;
2473 : : ParseNamespaceItem *nsitem;
2474 : : RangeTblRef *rtr;
2475 : :
2476 : : /*
2477 : : * Transform SelectStmt into a Query.
2478 : : *
2479 : : * This works the same as SELECT transformation normally would, except
2480 : : * that we prevent resolving unknown-type outputs as TEXT. This does
2481 : : * not change the subquery's semantics since if the column type
2482 : : * matters semantically, it would have been resolved to something else
2483 : : * anyway. Doing this lets us resolve such outputs using
2484 : : * select_common_type(), below.
2485 : : *
2486 : : * Note: previously transformed sub-queries don't affect the parsing
2487 : : * of this sub-query, because they are not in the toplevel pstate's
2488 : : * namespace list.
2489 : : */
2490 : 21491 : selectQuery = parse_sub_analyze((Node *) stmt, pstate,
2491 : : NULL, false, false);
2492 : :
2493 : : /*
2494 : : * Check for bogus references to Vars on the current query level (but
2495 : : * upper-level references are okay). Normally this can't happen
2496 : : * because the namespace will be empty, but it could happen if we are
2497 : : * inside a rule.
2498 : : */
2499 [ - + ]: 21471 : if (pstate->p_namespace)
2500 : : {
2501 [ # # ]: 0 : if (contain_vars_of_level((Node *) selectQuery, 1))
2502 [ # # ]: 0 : ereport(ERROR,
2503 : : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2504 : : errmsg("UNION/INTERSECT/EXCEPT member statement cannot refer to other relations of same query level"),
2505 : : parser_errposition(pstate,
2506 : : locate_var_of_level((Node *) selectQuery, 1))));
2507 : : }
2508 : :
2509 : : /*
2510 : : * Extract a list of the non-junk TLEs for upper-level processing.
2511 : : */
2512 [ + - ]: 21471 : if (targetlist)
2513 : : {
2514 : : ListCell *tl;
2515 : :
2516 : 21471 : *targetlist = NIL;
2517 [ + + + + : 81344 : foreach(tl, selectQuery->targetList)
+ + ]
2518 : : {
2519 : 59873 : TargetEntry *tle = (TargetEntry *) lfirst(tl);
2520 : :
2521 [ + + ]: 59873 : if (!tle->resjunk)
2522 : 59865 : *targetlist = lappend(*targetlist, tle);
2523 : : }
2524 : : }
2525 : :
2526 : : /*
2527 : : * Make the leaf query be a subquery in the top-level rangetable.
2528 : : */
2529 : 21471 : nsitem = addRangeTableEntryForSubquery(pstate,
2530 : : selectQuery,
2531 : : NULL,
2532 : : false,
2533 : : false);
2534 : :
2535 : : /*
2536 : : * Return a RangeTblRef to replace the SelectStmt in the set-op tree.
2537 : : */
2538 : 21471 : rtr = makeNode(RangeTblRef);
2539 : 21471 : rtr->rtindex = nsitem->p_rtindex;
2540 : 21471 : return (Node *) rtr;
2541 : : }
2542 : : else
2543 : : {
2544 : : /* Process an internal node (set operation node) */
2545 : 12924 : SetOperationStmt *op = makeNode(SetOperationStmt);
2546 : : List *ltargetlist;
2547 : : List *rtargetlist;
2548 : : const char *context;
2549 [ + + ]: 13660 : bool recursive = (pstate->p_parent_cte &&
2550 [ + + ]: 736 : pstate->p_parent_cte->cterecursive);
2551 : :
2552 [ + + ]: 13455 : context = (stmt->op == SETOP_UNION ? "UNION" :
2553 [ + + ]: 531 : (stmt->op == SETOP_INTERSECT ? "INTERSECT" :
2554 : : "EXCEPT"));
2555 : :
2556 : 12924 : op->op = stmt->op;
2557 : 12924 : op->all = stmt->all;
2558 : :
2559 : : /*
2560 : : * Recursively transform the left child node.
2561 : : */
2562 : 12924 : op->larg = transformSetOperationTree(pstate, stmt->larg,
2563 : : false,
2564 : : <argetlist);
2565 : :
2566 : : /*
2567 : : * If we are processing a recursive union query, now is the time to
2568 : : * examine the non-recursive term's output columns and mark the
2569 : : * containing CTE as having those result columns. We should do this
2570 : : * only at the topmost setop of the CTE, of course.
2571 : : */
2572 [ + + + + ]: 12920 : if (isTopLevel && recursive)
2573 : 640 : determineRecursiveColTypes(pstate, op->larg, ltargetlist);
2574 : :
2575 : : /*
2576 : : * Recursively transform the right child node.
2577 : : */
2578 : 12920 : op->rarg = transformSetOperationTree(pstate, stmt->rarg,
2579 : : false,
2580 : : &rtargetlist);
2581 : :
2582 : 12904 : constructSetOpTargetlist(pstate, op, ltargetlist, rtargetlist, targetlist,
2583 : : context, recursive);
2584 : :
2585 : 12876 : return (Node *) op;
2586 : : }
2587 : : }
2588 : :
2589 : : /*
2590 : : * constructSetOpTargetlist
2591 : : * Compute the types, typmods and collations of the columns in the target
2592 : : * list of the given set operation.
2593 : : *
2594 : : * For every pair of columns in the targetlists of the children, compute the
2595 : : * common type, typmod, and collation representing the output (UNION) column.
2596 : : * If targetlist is not NULL, also build the dummy output targetlist
2597 : : * containing non-resjunk output columns. The values are stored into the
2598 : : * given SetOperationStmt node. context is a string for error messages
2599 : : * ("UNION" etc.). recursive is true if it is a recursive union.
2600 : : */
2601 : : void
2602 : 13269 : constructSetOpTargetlist(ParseState *pstate, SetOperationStmt *op,
2603 : : const List *ltargetlist, const List *rtargetlist,
2604 : : List **targetlist, const char *context, bool recursive)
2605 : : {
2606 : : ListCell *ltl;
2607 : : ListCell *rtl;
2608 : :
2609 : : /*
2610 : : * Verify that the two children have the same number of non-junk columns,
2611 : : * and determine the types of the merged output columns.
2612 : : */
2613 [ - + ]: 13269 : if (list_length(ltargetlist) != list_length(rtargetlist))
2614 [ # # ]: 0 : ereport(ERROR,
2615 : : (errcode(ERRCODE_SYNTAX_ERROR),
2616 : : errmsg("each %s query must have the same number of columns",
2617 : : context),
2618 : : parser_errposition(pstate,
2619 : : exprLocation((const Node *) rtargetlist))));
2620 : :
2621 [ + + ]: 13269 : if (targetlist)
2622 : 4589 : *targetlist = NIL;
2623 : 13269 : op->colTypes = NIL;
2624 : 13269 : op->colTypmods = NIL;
2625 : 13269 : op->colCollations = NIL;
2626 : 13269 : op->groupClauses = NIL;
2627 : :
2628 [ + + + + : 53444 : forboth(ltl, ltargetlist, rtl, rtargetlist)
+ + + + +
+ + - +
+ ]
2629 : : {
2630 : 40203 : TargetEntry *ltle = (TargetEntry *) lfirst(ltl);
2631 : 40203 : TargetEntry *rtle = (TargetEntry *) lfirst(rtl);
2632 : 40203 : Node *lcolnode = (Node *) ltle->expr;
2633 : 40203 : Node *rcolnode = (Node *) rtle->expr;
2634 : 40203 : Oid lcoltype = exprType(lcolnode);
2635 : 40203 : Oid rcoltype = exprType(rcolnode);
2636 : : Node *bestexpr;
2637 : : int bestlocation;
2638 : : Oid rescoltype;
2639 : : int32 rescoltypmod;
2640 : : Oid rescolcoll;
2641 : :
2642 : : /* select common type, same as CASE et al */
2643 : 40203 : rescoltype = select_common_type(pstate,
2644 : : list_make2(lcolnode, rcolnode),
2645 : : context,
2646 : : &bestexpr);
2647 : 40203 : bestlocation = exprLocation(bestexpr);
2648 : :
2649 : : /*
2650 : : * Verify the coercions are actually possible. If not, we'd fail
2651 : : * later anyway, but we want to fail now while we have sufficient
2652 : : * context to produce an error cursor position.
2653 : : *
2654 : : * For all non-UNKNOWN-type cases, we verify coercibility but we don't
2655 : : * modify the child's expression, for fear of changing the child
2656 : : * query's semantics.
2657 : : *
2658 : : * If a child expression is an UNKNOWN-type Const or Param, we want to
2659 : : * replace it with the coerced expression. This can only happen when
2660 : : * the child is a leaf set-op node. It's safe to replace the
2661 : : * expression because if the child query's semantics depended on the
2662 : : * type of this output column, it'd have already coerced the UNKNOWN
2663 : : * to something else. We want to do this because (a) we want to
2664 : : * verify that a Const is valid for the target type, or resolve the
2665 : : * actual type of an UNKNOWN Param, and (b) we want to avoid
2666 : : * unnecessary discrepancies between the output type of the child
2667 : : * query and the resolved target type. Such a discrepancy would
2668 : : * disable optimization in the planner.
2669 : : *
2670 : : * If it's some other UNKNOWN-type node, eg a Var, we do nothing
2671 : : * (knowing that coerce_to_common_type would fail). The planner is
2672 : : * sometimes able to fold an UNKNOWN Var to a constant before it has
2673 : : * to coerce the type, so failing now would just break cases that
2674 : : * might work.
2675 : : */
2676 [ + + ]: 40203 : if (lcoltype != UNKNOWNOID)
2677 : 35862 : lcolnode = coerce_to_common_type(pstate, lcolnode,
2678 : : rescoltype, context);
2679 [ - + ]: 4341 : else if (IsA(lcolnode, Const) ||
2680 [ # # ]: 0 : IsA(lcolnode, Param))
2681 : : {
2682 : 4341 : lcolnode = coerce_to_common_type(pstate, lcolnode,
2683 : : rescoltype, context);
2684 : 4341 : ltle->expr = (Expr *) lcolnode;
2685 : : }
2686 : :
2687 [ + + ]: 40203 : if (rcoltype != UNKNOWNOID)
2688 : 35318 : rcolnode = coerce_to_common_type(pstate, rcolnode,
2689 : : rescoltype, context);
2690 [ - + ]: 4885 : else if (IsA(rcolnode, Const) ||
2691 [ # # ]: 0 : IsA(rcolnode, Param))
2692 : : {
2693 : 4885 : rcolnode = coerce_to_common_type(pstate, rcolnode,
2694 : : rescoltype, context);
2695 : 4881 : rtle->expr = (Expr *) rcolnode;
2696 : : }
2697 : :
2698 : 40199 : rescoltypmod = select_common_typmod(pstate,
2699 : : list_make2(lcolnode, rcolnode),
2700 : : rescoltype);
2701 : :
2702 : : /*
2703 : : * Select common collation. A common collation is required for all
2704 : : * set operators except UNION ALL; see SQL:2008 7.13 <query
2705 : : * expression> Syntax Rule 15c. (If we fail to identify a common
2706 : : * collation for a UNION ALL column, the colCollations element will be
2707 : : * set to InvalidOid, which may result in a runtime error if something
2708 : : * at a higher query level wants to use the column's collation.)
2709 : : */
2710 : 40199 : rescolcoll = select_common_collation(pstate,
2711 : : list_make2(lcolnode, rcolnode),
2712 [ + + + + ]: 40199 : (op->op == SETOP_UNION && op->all));
2713 : :
2714 : : /* emit results */
2715 : 40175 : op->colTypes = lappend_oid(op->colTypes, rescoltype);
2716 : 40175 : op->colTypmods = lappend_int(op->colTypmods, rescoltypmod);
2717 : 40175 : op->colCollations = lappend_oid(op->colCollations, rescolcoll);
2718 : :
2719 : : /*
2720 : : * For all cases except UNION ALL, identify the grouping operators
2721 : : * (and, if available, sorting operators) that will be used to
2722 : : * eliminate duplicates.
2723 : : */
2724 [ + + + + ]: 40175 : if (op->op != SETOP_UNION || !op->all)
2725 : : {
2726 : : ParseCallbackState pcbstate;
2727 : :
2728 : 17526 : setup_parser_errposition_callback(&pcbstate, pstate,
2729 : : bestlocation);
2730 : :
2731 : : /* If it's a recursive union, we need to require hashing support. */
2732 : 17526 : op->groupClauses = lappend(op->groupClauses,
2733 : 17526 : makeSortGroupClauseForSetOp(rescoltype, recursive));
2734 : :
2735 : 17526 : cancel_parser_errposition_callback(&pcbstate);
2736 : : }
2737 : :
2738 : : /*
2739 : : * Construct a dummy tlist entry to return. We use a SetToDefault
2740 : : * node for the expression, since it carries exactly the fields
2741 : : * needed, but any other expression node type would do as well.
2742 : : */
2743 [ + + ]: 40175 : if (targetlist)
2744 : : {
2745 : 19259 : SetToDefault *rescolnode = makeNode(SetToDefault);
2746 : : TargetEntry *restle;
2747 : :
2748 : 19259 : rescolnode->typeId = rescoltype;
2749 : 19259 : rescolnode->typeMod = rescoltypmod;
2750 : 19259 : rescolnode->collation = rescolcoll;
2751 : 19259 : rescolnode->location = bestlocation;
2752 : 19259 : restle = makeTargetEntry((Expr *) rescolnode,
2753 : : 0, /* no need to set resno */
2754 : : NULL,
2755 : : false);
2756 : 19259 : *targetlist = lappend(*targetlist, restle);
2757 : : }
2758 : : }
2759 : 13241 : }
2760 : :
2761 : : /*
2762 : : * Process the outputs of the non-recursive term of a recursive union
2763 : : * to set up the parent CTE's columns
2764 : : */
2765 : : static void
2766 : 640 : determineRecursiveColTypes(ParseState *pstate, Node *larg, List *nrtargetlist)
2767 : : {
2768 : : Node *node;
2769 : : int leftmostRTI;
2770 : : Query *leftmostQuery;
2771 : : List *targetList;
2772 : : ListCell *left_tlist;
2773 : : ListCell *nrtl;
2774 : : int next_resno;
2775 : :
2776 : : /*
2777 : : * Find leftmost leaf SELECT
2778 : : */
2779 : 640 : node = larg;
2780 [ + - + + ]: 644 : while (node && IsA(node, SetOperationStmt))
2781 : 4 : node = ((SetOperationStmt *) node)->larg;
2782 : : Assert(node && IsA(node, RangeTblRef));
2783 : 640 : leftmostRTI = ((RangeTblRef *) node)->rtindex;
2784 : 640 : leftmostQuery = rt_fetch(leftmostRTI, pstate->p_rtable)->subquery;
2785 : : Assert(leftmostQuery != NULL);
2786 : :
2787 : : /*
2788 : : * Generate dummy targetlist using column names of leftmost select and
2789 : : * dummy result expressions of the non-recursive term.
2790 : : */
2791 : 640 : targetList = NIL;
2792 : 640 : next_resno = 1;
2793 : :
2794 [ + - + + : 1980 : forboth(nrtl, nrtargetlist, left_tlist, leftmostQuery->targetList)
+ - + + +
+ + - +
+ ]
2795 : : {
2796 : 1340 : TargetEntry *nrtle = (TargetEntry *) lfirst(nrtl);
2797 : 1340 : TargetEntry *lefttle = (TargetEntry *) lfirst(left_tlist);
2798 : : char *colName;
2799 : : TargetEntry *tle;
2800 : :
2801 : : Assert(!lefttle->resjunk);
2802 : 1340 : colName = pstrdup(lefttle->resname);
2803 : 1340 : tle = makeTargetEntry(nrtle->expr,
2804 : 1340 : next_resno++,
2805 : : colName,
2806 : : false);
2807 : 1340 : targetList = lappend(targetList, tle);
2808 : : }
2809 : :
2810 : : /* Now build CTE's output column info using dummy targetlist */
2811 : 640 : analyzeCTETargetList(pstate, pstate->p_parent_cte, targetList);
2812 : 640 : }
2813 : :
2814 : :
2815 : : /*
2816 : : * transformReturnStmt -
2817 : : * transforms a return statement
2818 : : */
2819 : : static Query *
2820 : 2776 : transformReturnStmt(ParseState *pstate, ReturnStmt *stmt)
2821 : : {
2822 : 2776 : Query *qry = makeNode(Query);
2823 : :
2824 : 2776 : qry->commandType = CMD_SELECT;
2825 : 2776 : qry->isReturn = true;
2826 : :
2827 : 2776 : qry->targetList = list_make1(makeTargetEntry((Expr *) transformExpr(pstate, stmt->returnval, EXPR_KIND_SELECT_TARGET),
2828 : : 1, NULL, false));
2829 : :
2830 [ + - ]: 2772 : if (pstate->p_resolve_unknowns)
2831 : 2772 : resolveTargetListUnknowns(pstate, qry->targetList);
2832 : 2772 : qry->rtable = pstate->p_rtable;
2833 : 2772 : qry->rteperminfos = pstate->p_rteperminfos;
2834 : 2772 : qry->jointree = makeFromExpr(pstate->p_joinlist, NULL);
2835 : 2772 : qry->hasSubLinks = pstate->p_hasSubLinks;
2836 : 2772 : qry->hasWindowFuncs = pstate->p_hasWindowFuncs;
2837 : 2772 : qry->hasTargetSRFs = pstate->p_hasTargetSRFs;
2838 : 2772 : qry->hasAggs = pstate->p_hasAggs;
2839 : :
2840 : 2772 : assign_query_collations(pstate, qry);
2841 : :
2842 : 2772 : return qry;
2843 : : }
2844 : :
2845 : :
2846 : : /*
2847 : : * transformUpdateStmt -
2848 : : * transforms an update statement
2849 : : */
2850 : : static Query *
2851 : 9372 : transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt)
2852 : : {
2853 : 9372 : Query *qry = makeNode(Query);
2854 : : ParseNamespaceItem *nsitem;
2855 : : Node *qual;
2856 : :
2857 : 9372 : qry->commandType = CMD_UPDATE;
2858 : :
2859 : : /* process the WITH clause independently of all else */
2860 [ + + ]: 9372 : if (stmt->withClause)
2861 : : {
2862 : 55 : qry->hasRecursive = stmt->withClause->recursive;
2863 : 55 : qry->cteList = transformWithClause(pstate, stmt->withClause);
2864 : 55 : qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
2865 : : }
2866 : :
2867 : 18743 : qry->resultRelation = setTargetTable(pstate, stmt->relation,
2868 : 9372 : stmt->relation->inh,
2869 : : true,
2870 : : ACL_UPDATE);
2871 : :
2872 : : /* disallow UPDATE ... WHERE CURRENT OF on a view */
2873 [ + + ]: 9371 : if (stmt->whereClause &&
2874 [ + + ]: 7017 : IsA(stmt->whereClause, CurrentOfExpr) &&
2875 [ + + ]: 108 : pstate->p_target_relation->rd_rel->relkind == RELKIND_VIEW)
2876 [ + - ]: 4 : ereport(ERROR,
2877 : : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2878 : : errmsg("WHERE CURRENT OF on a view is not implemented"));
2879 : :
2880 [ + + ]: 9367 : if (stmt->forPortionOf)
2881 : 582 : qry->forPortionOf = transformForPortionOfClause(pstate,
2882 : : qry->resultRelation,
2883 : 642 : stmt->forPortionOf,
2884 : 642 : stmt->whereClause,
2885 : : true);
2886 : :
2887 : 9307 : nsitem = pstate->p_target_nsitem;
2888 : :
2889 : : /* subqueries in FROM cannot access the result relation */
2890 : 9307 : nsitem->p_lateral_only = true;
2891 : 9307 : nsitem->p_lateral_ok = false;
2892 : :
2893 : : /*
2894 : : * the FROM clause is non-standard SQL syntax. We used to be able to do
2895 : : * this with REPLACE in POSTQUEL so we keep the feature.
2896 : : */
2897 : 9307 : transformFromClause(pstate, stmt->fromClause);
2898 : :
2899 : : /* remaining clauses can reference the result relation normally */
2900 : 9291 : nsitem->p_lateral_only = false;
2901 : 9291 : nsitem->p_lateral_ok = true;
2902 : :
2903 : 9291 : qual = transformWhereClause(pstate, stmt->whereClause,
2904 : : EXPR_KIND_WHERE, "WHERE");
2905 : :
2906 : 9283 : transformReturningClause(pstate, qry, stmt->returningClause,
2907 : : EXPR_KIND_RETURNING);
2908 : :
2909 : : /*
2910 : : * Now we are done with SELECT-like processing, and can get on with
2911 : : * transforming the target list to match the UPDATE target columns.
2912 : : */
2913 : 9271 : qry->targetList = transformUpdateTargetList(pstate, stmt->targetList,
2914 : : qry->forPortionOf);
2915 : :
2916 : 9235 : qry->rtable = pstate->p_rtable;
2917 : 9235 : qry->rteperminfos = pstate->p_rteperminfos;
2918 : 9235 : qry->jointree = makeFromExpr(pstate->p_joinlist, qual);
2919 : :
2920 : 9235 : qry->hasTargetSRFs = pstate->p_hasTargetSRFs;
2921 : 9235 : qry->hasSubLinks = pstate->p_hasSubLinks;
2922 : :
2923 : 9235 : assign_query_collations(pstate, qry);
2924 : :
2925 : 9235 : return qry;
2926 : : }
2927 : :
2928 : : /*
2929 : : * transformUpdateTargetList -
2930 : : * handle SET clause in UPDATE/MERGE/INSERT ... ON CONFLICT UPDATE
2931 : : */
2932 : : List *
2933 : 11185 : transformUpdateTargetList(ParseState *pstate, List *origTlist, ForPortionOfExpr *forPortionOf)
2934 : : {
2935 : 11185 : List *tlist = NIL;
2936 : : RTEPermissionInfo *target_perminfo;
2937 : : ListCell *orig_tl;
2938 : : ListCell *tl;
2939 : :
2940 : 11185 : tlist = transformTargetList(pstate, origTlist,
2941 : : EXPR_KIND_UPDATE_SOURCE);
2942 : :
2943 : : /* Prepare to assign non-conflicting resnos to resjunk attributes */
2944 [ + + ]: 11153 : if (pstate->p_next_resno <= RelationGetNumberOfAttributes(pstate->p_target_relation))
2945 : 9488 : pstate->p_next_resno = RelationGetNumberOfAttributes(pstate->p_target_relation) + 1;
2946 : :
2947 : : /* Prepare non-junk columns for assignment to target table */
2948 : 11153 : target_perminfo = pstate->p_target_nsitem->p_perminfo;
2949 : 11153 : orig_tl = list_head(origTlist);
2950 : :
2951 [ + - + + : 24956 : foreach(tl, tlist)
+ + ]
2952 : : {
2953 : 13831 : TargetEntry *tle = (TargetEntry *) lfirst(tl);
2954 : : ResTarget *origTarget;
2955 : : int attrno;
2956 : :
2957 [ + + ]: 13831 : if (tle->resjunk)
2958 : : {
2959 : : /*
2960 : : * Resjunk nodes need no additional processing, but be sure they
2961 : : * have resnos that do not match any target columns; else rewriter
2962 : : * or planner might get confused. They don't need a resname
2963 : : * either.
2964 : : */
2965 : 91 : tle->resno = (AttrNumber) pstate->p_next_resno++;
2966 : 91 : tle->resname = NULL;
2967 : 91 : continue;
2968 : : }
2969 [ - + ]: 13740 : if (orig_tl == NULL)
2970 [ # # ]: 0 : elog(ERROR, "UPDATE target count mismatch --- internal error");
2971 : 13740 : origTarget = lfirst_node(ResTarget, orig_tl);
2972 : :
2973 : 13740 : attrno = attnameAttNum(pstate->p_target_relation,
2974 : 13740 : origTarget->name, true);
2975 [ + + ]: 13740 : if (attrno == InvalidAttrNumber)
2976 [ + - + + : 16 : ereport(ERROR,
+ - ]
2977 : : (errcode(ERRCODE_UNDEFINED_COLUMN),
2978 : : errmsg("column \"%s\" of relation \"%s\" does not exist",
2979 : : origTarget->name,
2980 : : RelationGetRelationName(pstate->p_target_relation)),
2981 : : (origTarget->indirection != NIL &&
2982 : : strcmp(origTarget->name, pstate->p_target_nsitem->p_names->aliasname) == 0) ?
2983 : : errhint("SET target columns cannot be qualified with the relation name.") : 0,
2984 : : parser_errposition(pstate, origTarget->location)));
2985 : :
2986 : : /*
2987 : : * If this is a FOR PORTION OF update, forbid directly setting the
2988 : : * range column, since that would conflict with the implicit updates.
2989 : : */
2990 [ + + ]: 13724 : if (forPortionOf != NULL)
2991 : : {
2992 [ + + ]: 595 : if (attrno == forPortionOf->rangeVar->varattno)
2993 [ + - ]: 4 : ereport(ERROR,
2994 : : (errcode(ERRCODE_SYNTAX_ERROR),
2995 : : errmsg("cannot update column \"%s\" because it is used in FOR PORTION OF",
2996 : : origTarget->name),
2997 : : parser_errposition(pstate, origTarget->location)));
2998 : : }
2999 : :
3000 : 13720 : updateTargetListEntry(pstate, tle, origTarget->name,
3001 : : attrno,
3002 : : origTarget->indirection,
3003 : : origTarget->location);
3004 : :
3005 : : /* Mark the target column as requiring update permissions */
3006 : 13712 : target_perminfo->updatedCols = bms_add_member(target_perminfo->updatedCols,
3007 : : attrno - FirstLowInvalidHeapAttributeNumber);
3008 : :
3009 : 13712 : orig_tl = lnext(origTlist, orig_tl);
3010 : : }
3011 [ - + ]: 11125 : if (orig_tl != NULL)
3012 [ # # ]: 0 : elog(ERROR, "UPDATE target count mismatch --- internal error");
3013 : :
3014 : 11125 : return tlist;
3015 : : }
3016 : :
3017 : : /*
3018 : : * addNSItemForReturning -
3019 : : * add a ParseNamespaceItem for the OLD or NEW alias in RETURNING.
3020 : : */
3021 : : static void
3022 : 4644 : addNSItemForReturning(ParseState *pstate, const char *aliasname,
3023 : : VarReturningType returning_type)
3024 : : {
3025 : : List *colnames;
3026 : : int numattrs;
3027 : : ParseNamespaceColumn *nscolumns;
3028 : : ParseNamespaceItem *nsitem;
3029 : :
3030 : : /* copy per-column data from the target relation */
3031 : 4644 : colnames = pstate->p_target_nsitem->p_rte->eref->colnames;
3032 : 4644 : numattrs = list_length(colnames);
3033 : :
3034 : 4644 : nscolumns = palloc_array(ParseNamespaceColumn, numattrs);
3035 : :
3036 : 4644 : memcpy(nscolumns, pstate->p_target_nsitem->p_nscolumns,
3037 : : numattrs * sizeof(ParseNamespaceColumn));
3038 : :
3039 : : /* mark all columns as returning OLD/NEW */
3040 [ + + ]: 18254 : for (int i = 0; i < numattrs; i++)
3041 : 13610 : nscolumns[i].p_varreturningtype = returning_type;
3042 : :
3043 : : /* build the nsitem, copying most fields from the target relation */
3044 : 4644 : nsitem = palloc_object(ParseNamespaceItem);
3045 : 4644 : nsitem->p_names = makeAlias(aliasname, colnames);
3046 : 4644 : nsitem->p_rte = pstate->p_target_nsitem->p_rte;
3047 : 4644 : nsitem->p_rtindex = pstate->p_target_nsitem->p_rtindex;
3048 : 4644 : nsitem->p_perminfo = pstate->p_target_nsitem->p_perminfo;
3049 : 4644 : nsitem->p_nscolumns = nscolumns;
3050 : 4644 : nsitem->p_returning_type = returning_type;
3051 : :
3052 : : /* add it to the query namespace as a table-only item */
3053 : 4644 : addNSItemToQuery(pstate, nsitem, false, true, false);
3054 : 4644 : }
3055 : :
3056 : : /*
3057 : : * transformReturningClause -
3058 : : * handle a RETURNING clause in INSERT/UPDATE/DELETE/MERGE
3059 : : */
3060 : : void
3061 : 15072 : transformReturningClause(ParseState *pstate, Query *qry,
3062 : : ReturningClause *returningClause,
3063 : : ParseExprKind exprKind)
3064 : : {
3065 : 15072 : int save_nslen = list_length(pstate->p_namespace);
3066 : : int save_next_resno;
3067 : :
3068 [ + + ]: 15072 : if (returningClause == NULL)
3069 : 12704 : return; /* nothing to do */
3070 : :
3071 : : /*
3072 : : * Scan RETURNING WITH(...) options for OLD/NEW alias names. Complain if
3073 : : * there is any conflict with existing relations.
3074 : : */
3075 [ + + + + : 4784 : foreach_node(ReturningOption, option, returningClause->options)
+ + ]
3076 : : {
3077 [ + + - ]: 80 : switch (option->option)
3078 : : {
3079 : 36 : case RETURNING_OPTION_OLD:
3080 [ + + ]: 36 : if (qry->returningOldAlias != NULL)
3081 [ + - ]: 4 : ereport(ERROR,
3082 : : errcode(ERRCODE_SYNTAX_ERROR),
3083 : : /* translator: %s is OLD or NEW */
3084 : : errmsg("%s cannot be specified multiple times", "OLD"),
3085 : : parser_errposition(pstate, option->location));
3086 : 32 : qry->returningOldAlias = option->value;
3087 : 32 : break;
3088 : :
3089 : 44 : case RETURNING_OPTION_NEW:
3090 [ + + ]: 44 : if (qry->returningNewAlias != NULL)
3091 [ + - ]: 4 : ereport(ERROR,
3092 : : errcode(ERRCODE_SYNTAX_ERROR),
3093 : : /* translator: %s is OLD or NEW */
3094 : : errmsg("%s cannot be specified multiple times", "NEW"),
3095 : : parser_errposition(pstate, option->location));
3096 : 40 : qry->returningNewAlias = option->value;
3097 : 40 : break;
3098 : :
3099 : 0 : default:
3100 [ # # ]: 0 : elog(ERROR, "unrecognized returning option: %d", option->option);
3101 : : }
3102 : :
3103 [ + + ]: 72 : if (refnameNamespaceItem(pstate, NULL, option->value, -1, NULL) != NULL)
3104 [ + - ]: 8 : ereport(ERROR,
3105 : : errcode(ERRCODE_DUPLICATE_ALIAS),
3106 : : errmsg("table name \"%s\" specified more than once",
3107 : : option->value),
3108 : : parser_errposition(pstate, option->location));
3109 : :
3110 : 64 : addNSItemForReturning(pstate, option->value,
3111 [ + + ]: 64 : option->option == RETURNING_OPTION_OLD ?
3112 : : VAR_RETURNING_OLD : VAR_RETURNING_NEW);
3113 : : }
3114 : :
3115 : : /*
3116 : : * If OLD/NEW alias names weren't explicitly specified, use "old"/"new"
3117 : : * unless masked by existing relations.
3118 : : */
3119 [ + + + + ]: 4684 : if (qry->returningOldAlias == NULL &&
3120 : 2332 : refnameNamespaceItem(pstate, NULL, "old", -1, NULL) == NULL)
3121 : : {
3122 : 2292 : qry->returningOldAlias = "old";
3123 : 2292 : addNSItemForReturning(pstate, "old", VAR_RETURNING_OLD);
3124 : : }
3125 [ + + + + ]: 4680 : if (qry->returningNewAlias == NULL &&
3126 : 2328 : refnameNamespaceItem(pstate, NULL, "new", -1, NULL) == NULL)
3127 : : {
3128 : 2288 : qry->returningNewAlias = "new";
3129 : 2288 : addNSItemForReturning(pstate, "new", VAR_RETURNING_NEW);
3130 : : }
3131 : :
3132 : : /*
3133 : : * We need to assign resnos starting at one in the RETURNING list. Save
3134 : : * and restore the main tlist's value of p_next_resno, just in case
3135 : : * someone looks at it later (probably won't happen).
3136 : : */
3137 : 2352 : save_next_resno = pstate->p_next_resno;
3138 : 2352 : pstate->p_next_resno = 1;
3139 : :
3140 : : /* transform RETURNING expressions identically to a SELECT targetlist */
3141 : 2352 : qry->returningList = transformTargetList(pstate,
3142 : : returningClause->exprs,
3143 : : exprKind);
3144 : :
3145 : : /*
3146 : : * Complain if the nonempty tlist expanded to nothing (which is possible
3147 : : * if it contains only a star-expansion of a zero-column table). If we
3148 : : * allow this, the parsed Query will look like it didn't have RETURNING,
3149 : : * with results that would probably surprise the user.
3150 : : */
3151 [ + + ]: 2324 : if (qry->returningList == NIL)
3152 [ + - ]: 4 : ereport(ERROR,
3153 : : (errcode(ERRCODE_SYNTAX_ERROR),
3154 : : errmsg("RETURNING must have at least one column"),
3155 : : parser_errposition(pstate,
3156 : : exprLocation(linitial(returningClause->exprs)))));
3157 : :
3158 : : /* mark column origins */
3159 : 2320 : markTargetListOrigins(pstate, qry->returningList);
3160 : :
3161 : : /* resolve any still-unresolved output columns as being type text */
3162 [ + - ]: 2320 : if (pstate->p_resolve_unknowns)
3163 : 2320 : resolveTargetListUnknowns(pstate, qry->returningList);
3164 : :
3165 : : /* restore state */
3166 : 2320 : pstate->p_namespace = list_truncate(pstate->p_namespace, save_nslen);
3167 : 2320 : pstate->p_next_resno = save_next_resno;
3168 : : }
3169 : :
3170 : :
3171 : : /*
3172 : : * transformPLAssignStmt -
3173 : : * transform a PL/pgSQL assignment statement
3174 : : *
3175 : : * If there is no opt_indirection, the transformed statement looks like
3176 : : * "SELECT a_expr ...", except the expression has been cast to the type of
3177 : : * the target. With indirection, it's still a SELECT, but the expression will
3178 : : * incorporate FieldStore and/or assignment SubscriptingRef nodes to compute a
3179 : : * new value for a container-type variable represented by the target. The
3180 : : * expression references the target as the container source.
3181 : : */
3182 : : static Query *
3183 : 3346 : transformPLAssignStmt(ParseState *pstate, PLAssignStmt *stmt)
3184 : : {
3185 : : Query *qry;
3186 : 3346 : ColumnRef *cref = makeNode(ColumnRef);
3187 : 3346 : List *indirection = stmt->indirection;
3188 : 3346 : int nnames = stmt->nnames;
3189 : : Node *target;
3190 : : SelectStmtPassthrough passthru;
3191 : : bool save_resolve_unknowns;
3192 : :
3193 : : /*
3194 : : * First, construct a ColumnRef for the target variable. If the target
3195 : : * has more than one dotted name, we have to pull the extra names out of
3196 : : * the indirection list.
3197 : : */
3198 : 3346 : cref->fields = list_make1(makeString(stmt->name));
3199 : 3346 : cref->location = stmt->location;
3200 [ + + ]: 3346 : if (nnames > 1)
3201 : : {
3202 : : /* avoid munging the raw parsetree */
3203 : 263 : indirection = list_copy(indirection);
3204 [ + + + - ]: 533 : while (--nnames > 0 && indirection != NIL)
3205 : : {
3206 : 270 : Node *ind = (Node *) linitial(indirection);
3207 : :
3208 [ - + ]: 270 : if (!IsA(ind, String))
3209 [ # # ]: 0 : elog(ERROR, "invalid name count in PLAssignStmt");
3210 : 270 : cref->fields = lappend(cref->fields, ind);
3211 : 270 : indirection = list_delete_first(indirection);
3212 : : }
3213 : : }
3214 : :
3215 : : /*
3216 : : * Transform the target reference. Typically we will get back a Param
3217 : : * node, but there's no reason to be too picky about its type. (Note that
3218 : : * we must do this before calling transformSelectStmt. It's tempting to
3219 : : * do it inside transformPLAssignStmtTarget, but we need to do it before
3220 : : * adding any FROM tables to the pstate's namespace, else we might wrongly
3221 : : * resolve the target as a table column.)
3222 : : */
3223 : 3346 : target = transformExpr(pstate, (Node *) cref,
3224 : : EXPR_KIND_UPDATE_TARGET);
3225 : :
3226 : : /* Set up passthrough data for transformPLAssignStmtTarget */
3227 : 3340 : passthru.stmt = stmt;
3228 : 3340 : passthru.target = target;
3229 : 3340 : passthru.indirection = indirection;
3230 : :
3231 : : /*
3232 : : * To avoid duplicating a lot of code, we use transformSelectStmt to do
3233 : : * almost all of the work. However, we need to do additional processing
3234 : : * on the SELECT's targetlist after it's been transformed, but before
3235 : : * possible addition of targetlist items for ORDER BY or GROUP BY.
3236 : : * transformSelectStmt knows it should call transformPLAssignStmtTarget if
3237 : : * it's passed a passthru argument.
3238 : : *
3239 : : * Also, disable resolution of unknown-type tlist items; PL/pgSQL wants to
3240 : : * deal with that itself.
3241 : : */
3242 : 3340 : save_resolve_unknowns = pstate->p_resolve_unknowns;
3243 : 3340 : pstate->p_resolve_unknowns = false;
3244 : 3340 : qry = transformSelectStmt(pstate, stmt->val, &passthru);
3245 : 3333 : pstate->p_resolve_unknowns = save_resolve_unknowns;
3246 : :
3247 : 3333 : return qry;
3248 : : }
3249 : :
3250 : : /*
3251 : : * Callback function to adjust a SELECT's tlist to make the output suitable
3252 : : * for assignment to a PLAssignStmt's target variable.
3253 : : *
3254 : : * Note: we actually modify the tle->expr in-place, but the function's API
3255 : : * is set up to not presume that.
3256 : : */
3257 : : static List *
3258 : 3340 : transformPLAssignStmtTarget(ParseState *pstate, List *tlist,
3259 : : SelectStmtPassthrough *passthru)
3260 : : {
3261 : 3340 : PLAssignStmt *stmt = passthru->stmt;
3262 : 3340 : Node *target = passthru->target;
3263 : 3340 : List *indirection = passthru->indirection;
3264 : : Oid targettype;
3265 : : int32 targettypmod;
3266 : : Oid targetcollation;
3267 : : TargetEntry *tle;
3268 : : Oid type_id;
3269 : :
3270 : 3340 : targettype = exprType(target);
3271 : 3340 : targettypmod = exprTypmod(target);
3272 : 3340 : targetcollation = exprCollation(target);
3273 : :
3274 : : /* we should have exactly one targetlist item */
3275 [ + + ]: 3340 : if (list_length(tlist) != 1)
3276 [ + - ]: 2 : ereport(ERROR,
3277 : : (errcode(ERRCODE_SYNTAX_ERROR),
3278 : : errmsg_plural("assignment source returned %d column",
3279 : : "assignment source returned %d columns",
3280 : : list_length(tlist),
3281 : : list_length(tlist))));
3282 : :
3283 : 3338 : tle = linitial_node(TargetEntry, tlist);
3284 : :
3285 : : /*
3286 : : * This next bit is similar to transformAssignedExpr; the key difference
3287 : : * is we use COERCION_PLPGSQL not COERCION_ASSIGNMENT.
3288 : : */
3289 : 3338 : type_id = exprType((Node *) tle->expr);
3290 : :
3291 : 3338 : pstate->p_expr_kind = EXPR_KIND_UPDATE_TARGET;
3292 : :
3293 [ + + ]: 3338 : if (indirection)
3294 : : {
3295 : 60 : tle->expr = (Expr *)
3296 : 65 : transformAssignmentIndirection(pstate,
3297 : : target,
3298 : 65 : stmt->name,
3299 : : false,
3300 : : targettype,
3301 : : targettypmod,
3302 : : targetcollation,
3303 : : indirection,
3304 : : list_head(indirection),
3305 : 65 : (Node *) tle->expr,
3306 : : COERCION_PLPGSQL,
3307 : : exprLocation(target));
3308 : : }
3309 [ + + + + ]: 3273 : else if (targettype != type_id &&
3310 [ + + + + ]: 894 : (targettype == RECORDOID || ISCOMPLEX(targettype)) &&
3311 [ + + ]: 226 : (type_id == RECORDOID || ISCOMPLEX(type_id)))
3312 : : {
3313 : : /*
3314 : : * Hack: do not let coerce_to_target_type() deal with inconsistent
3315 : : * composite types. Just pass the expression result through as-is,
3316 : : * and let the PL/pgSQL executor do the conversion its way. This is
3317 : : * rather bogus, but it's needed for backwards compatibility.
3318 : : */
3319 : : }
3320 : : else
3321 : : {
3322 : : /*
3323 : : * For normal non-qualified target column, do type checking and
3324 : : * coercion.
3325 : : */
3326 : 3091 : Node *orig_expr = (Node *) tle->expr;
3327 : :
3328 : 3091 : tle->expr = (Expr *)
3329 : 3091 : coerce_to_target_type(pstate,
3330 : : orig_expr, type_id,
3331 : : targettype, targettypmod,
3332 : : COERCION_PLPGSQL,
3333 : : COERCE_IMPLICIT_CAST,
3334 : : -1);
3335 : : /* With COERCION_PLPGSQL, this error is probably unreachable */
3336 [ - + ]: 3091 : if (tle->expr == NULL)
3337 [ # # ]: 0 : ereport(ERROR,
3338 : : (errcode(ERRCODE_DATATYPE_MISMATCH),
3339 : : errmsg("variable \"%s\" is of type %s"
3340 : : " but expression is of type %s",
3341 : : stmt->name,
3342 : : format_type_be(targettype),
3343 : : format_type_be(type_id)),
3344 : : errhint("You will need to rewrite or cast the expression."),
3345 : : parser_errposition(pstate, exprLocation(orig_expr))));
3346 : : }
3347 : :
3348 : 3333 : pstate->p_expr_kind = EXPR_KIND_NONE;
3349 : :
3350 : 3333 : return list_make1(tle);
3351 : : }
3352 : :
3353 : :
3354 : : /*
3355 : : * transformDeclareCursorStmt -
3356 : : * transform a DECLARE CURSOR Statement
3357 : : *
3358 : : * DECLARE CURSOR is like other utility statements in that we emit it as a
3359 : : * CMD_UTILITY Query node; however, we must first transform the contained
3360 : : * query. We used to postpone that until execution, but it's really necessary
3361 : : * to do it during the normal parse analysis phase to ensure that side effects
3362 : : * of parser hooks happen at the expected time.
3363 : : */
3364 : : static Query *
3365 : 2755 : transformDeclareCursorStmt(ParseState *pstate, DeclareCursorStmt *stmt)
3366 : : {
3367 : : Query *result;
3368 : : Query *query;
3369 : :
3370 [ + + ]: 2755 : if ((stmt->options & CURSOR_OPT_SCROLL) &&
3371 [ - + ]: 160 : (stmt->options & CURSOR_OPT_NO_SCROLL))
3372 [ # # ]: 0 : ereport(ERROR,
3373 : : (errcode(ERRCODE_INVALID_CURSOR_DEFINITION),
3374 : : /* translator: %s is a SQL keyword */
3375 : : errmsg("cannot specify both %s and %s",
3376 : : "SCROLL", "NO SCROLL")));
3377 : :
3378 [ - + ]: 2755 : if ((stmt->options & CURSOR_OPT_ASENSITIVE) &&
3379 [ # # ]: 0 : (stmt->options & CURSOR_OPT_INSENSITIVE))
3380 [ # # ]: 0 : ereport(ERROR,
3381 : : (errcode(ERRCODE_INVALID_CURSOR_DEFINITION),
3382 : : /* translator: %s is a SQL keyword */
3383 : : errmsg("cannot specify both %s and %s",
3384 : : "ASENSITIVE", "INSENSITIVE")));
3385 : :
3386 : : /* Transform contained query, not allowing SELECT INTO */
3387 : 2755 : query = transformStmt(pstate, stmt->query);
3388 : 2742 : stmt->query = (Node *) query;
3389 : :
3390 : : /* Grammar should not have allowed anything but SELECT */
3391 [ + - ]: 2742 : if (!IsA(query, Query) ||
3392 [ - + ]: 2742 : query->commandType != CMD_SELECT)
3393 [ # # ]: 0 : elog(ERROR, "unexpected non-SELECT command in DECLARE CURSOR");
3394 : :
3395 : : /*
3396 : : * We also disallow data-modifying WITH in a cursor. (This could be
3397 : : * allowed, but the semantics of when the updates occur might be
3398 : : * surprising.)
3399 : : */
3400 [ - + ]: 2742 : if (query->hasModifyingCTE)
3401 [ # # ]: 0 : ereport(ERROR,
3402 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3403 : : errmsg("DECLARE CURSOR must not contain data-modifying statements in WITH")));
3404 : :
3405 : : /* FOR UPDATE and WITH HOLD are not compatible */
3406 [ + + - + ]: 2742 : if (query->rowMarks != NIL && (stmt->options & CURSOR_OPT_HOLD))
3407 [ # # ]: 0 : ereport(ERROR,
3408 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3409 : : /*------
3410 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3411 : : errmsg("DECLARE CURSOR WITH HOLD ... %s is not supported",
3412 : : LCS_asString(((RowMarkClause *)
3413 : : linitial(query->rowMarks))->strength)),
3414 : : errdetail("Holdable cursors must be READ ONLY.")));
3415 : :
3416 : : /* FOR UPDATE and SCROLL are not compatible */
3417 [ + + - + ]: 2742 : if (query->rowMarks != NIL && (stmt->options & CURSOR_OPT_SCROLL))
3418 [ # # ]: 0 : ereport(ERROR,
3419 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3420 : : /*------
3421 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3422 : : errmsg("DECLARE SCROLL CURSOR ... %s is not supported",
3423 : : LCS_asString(((RowMarkClause *)
3424 : : linitial(query->rowMarks))->strength)),
3425 : : errdetail("Scrollable cursors must be READ ONLY.")));
3426 : :
3427 : : /* FOR UPDATE and INSENSITIVE are not compatible */
3428 [ + + - + ]: 2742 : if (query->rowMarks != NIL && (stmt->options & CURSOR_OPT_INSENSITIVE))
3429 [ # # ]: 0 : ereport(ERROR,
3430 : : (errcode(ERRCODE_INVALID_CURSOR_DEFINITION),
3431 : : /*------
3432 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3433 : : errmsg("DECLARE INSENSITIVE CURSOR ... %s is not valid",
3434 : : LCS_asString(((RowMarkClause *)
3435 : : linitial(query->rowMarks))->strength)),
3436 : : errdetail("Insensitive cursors must be READ ONLY.")));
3437 : :
3438 : : /* represent the command as a utility Query */
3439 : 2742 : result = makeNode(Query);
3440 : 2742 : result->commandType = CMD_UTILITY;
3441 : 2742 : result->utilityStmt = (Node *) stmt;
3442 : :
3443 : 2742 : return result;
3444 : : }
3445 : :
3446 : :
3447 : : /*
3448 : : * transformExplainStmt -
3449 : : * transform an EXPLAIN Statement
3450 : : *
3451 : : * EXPLAIN is like other utility statements in that we emit it as a
3452 : : * CMD_UTILITY Query node; however, we must first transform the contained
3453 : : * query. We used to postpone that until execution, but it's really necessary
3454 : : * to do it during the normal parse analysis phase to ensure that side effects
3455 : : * of parser hooks happen at the expected time.
3456 : : */
3457 : : static Query *
3458 : 16730 : transformExplainStmt(ParseState *pstate, ExplainStmt *stmt)
3459 : : {
3460 : : Query *result;
3461 : 16730 : bool generic_plan = false;
3462 : 16730 : Oid *paramTypes = NULL;
3463 : 16730 : int numParams = 0;
3464 : :
3465 : : /*
3466 : : * If we have no external source of parameter definitions, and the
3467 : : * GENERIC_PLAN option is specified, then accept variable parameter
3468 : : * definitions (similarly to PREPARE, for example).
3469 : : */
3470 [ + + ]: 16730 : if (pstate->p_paramref_hook == NULL)
3471 : : {
3472 : : ListCell *lc;
3473 : :
3474 [ + + + + : 33263 : foreach(lc, stmt->options)
+ + ]
3475 : : {
3476 : 16545 : DefElem *opt = (DefElem *) lfirst(lc);
3477 : :
3478 [ + + ]: 16545 : if (strcmp(opt->defname, "generic_plan") == 0)
3479 : 12 : generic_plan = defGetBoolean(opt);
3480 : : /* don't "break", as we want the last value */
3481 : : }
3482 [ + + ]: 16718 : if (generic_plan)
3483 : 12 : setup_parse_variable_parameters(pstate, ¶mTypes, &numParams);
3484 : : }
3485 : :
3486 : : /* transform contained query, allowing SELECT INTO */
3487 : 16730 : stmt->query = (Node *) transformOptionalSelectInto(pstate, stmt->query);
3488 : :
3489 : : /* make sure all is well with parameter types */
3490 [ + + ]: 16725 : if (generic_plan)
3491 : 12 : check_variable_parameters(pstate, (Query *) stmt->query);
3492 : :
3493 : : /* represent the command as a utility Query */
3494 : 16725 : result = makeNode(Query);
3495 : 16725 : result->commandType = CMD_UTILITY;
3496 : 16725 : result->utilityStmt = (Node *) stmt;
3497 : :
3498 : 16725 : return result;
3499 : : }
3500 : :
3501 : :
3502 : : /*
3503 : : * transformCreateTableAsStmt -
3504 : : * transform a CREATE TABLE AS, SELECT ... INTO, or CREATE MATERIALIZED VIEW
3505 : : * Statement
3506 : : *
3507 : : * As with DECLARE CURSOR and EXPLAIN, transform the contained statement now.
3508 : : */
3509 : : static Query *
3510 : 1319 : transformCreateTableAsStmt(ParseState *pstate, CreateTableAsStmt *stmt)
3511 : : {
3512 : : Query *result;
3513 : : Query *query;
3514 : :
3515 : : /* transform contained query, not allowing SELECT INTO */
3516 : 1319 : query = transformStmt(pstate, stmt->query);
3517 : 1317 : stmt->query = (Node *) query;
3518 : :
3519 : : /* additional work needed for CREATE MATERIALIZED VIEW */
3520 [ + + ]: 1317 : if (stmt->objtype == OBJECT_MATVIEW)
3521 : : {
3522 : : ObjectAddress temp_object;
3523 : :
3524 : : /*
3525 : : * Prohibit a data-modifying CTE in the query used to create a
3526 : : * materialized view. It's not sufficiently clear what the user would
3527 : : * want to happen if the MV is refreshed or incrementally maintained.
3528 : : */
3529 [ - + ]: 356 : if (query->hasModifyingCTE)
3530 [ # # ]: 0 : ereport(ERROR,
3531 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3532 : : errmsg("materialized views must not use data-modifying statements in WITH")));
3533 : :
3534 : : /*
3535 : : * Check whether any temporary database objects are used in the
3536 : : * creation query. It would be hard to refresh data or incrementally
3537 : : * maintain it if a source disappeared.
3538 : : */
3539 [ + + ]: 356 : if (query_uses_temp_object(query, &temp_object))
3540 [ + - ]: 4 : ereport(ERROR,
3541 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3542 : : errmsg("materialized views must not use temporary objects"),
3543 : : errdetail("This view depends on temporary %s.",
3544 : : getObjectDescription(&temp_object, false))));
3545 : :
3546 : : /*
3547 : : * A materialized view would either need to save parameters for use in
3548 : : * maintaining/loading the data or prohibit them entirely. The latter
3549 : : * seems safer and more sane.
3550 : : */
3551 [ - + ]: 348 : if (query_contains_extern_params(query))
3552 [ # # ]: 0 : ereport(ERROR,
3553 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3554 : : errmsg("materialized views may not be defined using bound parameters")));
3555 : :
3556 : : /*
3557 : : * For now, we disallow unlogged materialized views, because it seems
3558 : : * like a bad idea for them to just go to empty after a crash. (If we
3559 : : * could mark them as unpopulated, that would be better, but that
3560 : : * requires catalog changes which crash recovery can't presently
3561 : : * handle.)
3562 : : */
3563 [ - + ]: 348 : if (stmt->into->rel->relpersistence == RELPERSISTENCE_UNLOGGED)
3564 [ # # ]: 0 : ereport(ERROR,
3565 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3566 : : errmsg("materialized views cannot be unlogged")));
3567 : :
3568 : : /*
3569 : : * At runtime, we'll need a copy of the parsed-but-not-rewritten Query
3570 : : * for purposes of creating the view's ON SELECT rule. We stash that
3571 : : * in the IntoClause because that's where intorel_startup() can
3572 : : * conveniently get it from.
3573 : : */
3574 : 348 : stmt->into->viewQuery = copyObject(query);
3575 : : }
3576 : :
3577 : : /* represent the command as a utility Query */
3578 : 1309 : result = makeNode(Query);
3579 : 1309 : result->commandType = CMD_UTILITY;
3580 : 1309 : result->utilityStmt = (Node *) stmt;
3581 : :
3582 : 1309 : return result;
3583 : : }
3584 : :
3585 : : /*
3586 : : * transform a CallStmt
3587 : : */
3588 : : static Query *
3589 : 313 : transformCallStmt(ParseState *pstate, CallStmt *stmt)
3590 : : {
3591 : : List *targs;
3592 : : ListCell *lc;
3593 : : Node *node;
3594 : : FuncExpr *fexpr;
3595 : : HeapTuple proctup;
3596 : : Datum proargmodes;
3597 : : bool isNull;
3598 : 313 : List *outargs = NIL;
3599 : : Query *result;
3600 : :
3601 : : /*
3602 : : * First, do standard parse analysis on the procedure call and its
3603 : : * arguments, allowing us to identify the called procedure.
3604 : : */
3605 : 313 : targs = NIL;
3606 [ + + + + : 765 : foreach(lc, stmt->funccall->args)
+ + ]
3607 : : {
3608 : 452 : targs = lappend(targs, transformExpr(pstate,
3609 : 452 : (Node *) lfirst(lc),
3610 : : EXPR_KIND_CALL_ARGUMENT));
3611 : : }
3612 : :
3613 : 313 : node = ParseFuncOrColumn(pstate,
3614 : 313 : stmt->funccall->funcname,
3615 : : targs,
3616 : : pstate->p_last_srf,
3617 : : stmt->funccall,
3618 : : true,
3619 : 313 : stmt->funccall->location);
3620 : :
3621 : 292 : assign_expr_collations(pstate, node);
3622 : :
3623 : 292 : fexpr = castNode(FuncExpr, node);
3624 : :
3625 : 292 : proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(fexpr->funcid));
3626 [ - + ]: 292 : if (!HeapTupleIsValid(proctup))
3627 [ # # ]: 0 : elog(ERROR, "cache lookup failed for function %u", fexpr->funcid);
3628 : :
3629 : : /*
3630 : : * Expand the argument list to deal with named-argument notation and
3631 : : * default arguments. For ordinary FuncExprs this'd be done during
3632 : : * planning, but a CallStmt doesn't go through planning, and there seems
3633 : : * no good reason not to do it here.
3634 : : */
3635 : 292 : fexpr->args = expand_function_arguments(fexpr->args,
3636 : : true,
3637 : : fexpr->funcresulttype,
3638 : : proctup);
3639 : :
3640 : : /* Fetch proargmodes; if it's null, there are no output args */
3641 : 292 : proargmodes = SysCacheGetAttr(PROCOID, proctup,
3642 : : Anum_pg_proc_proargmodes,
3643 : : &isNull);
3644 [ + + ]: 292 : if (!isNull)
3645 : : {
3646 : : /*
3647 : : * Split the list into input arguments in fexpr->args and output
3648 : : * arguments in stmt->outargs. INOUT arguments appear in both lists.
3649 : : */
3650 : : ArrayType *arr;
3651 : : int numargs;
3652 : : char *argmodes;
3653 : : List *inargs;
3654 : : int i;
3655 : :
3656 : 119 : arr = DatumGetArrayTypeP(proargmodes); /* ensure not toasted */
3657 : 119 : numargs = list_length(fexpr->args);
3658 [ + - ]: 119 : if (ARR_NDIM(arr) != 1 ||
3659 [ + - ]: 119 : ARR_DIMS(arr)[0] != numargs ||
3660 [ + - ]: 119 : ARR_HASNULL(arr) ||
3661 [ - + ]: 119 : ARR_ELEMTYPE(arr) != CHAROID)
3662 [ # # ]: 0 : elog(ERROR, "proargmodes is not a 1-D char array of length %d or it contains nulls",
3663 : : numargs);
3664 [ - + ]: 119 : argmodes = (char *) ARR_DATA_PTR(arr);
3665 : :
3666 : 119 : inargs = NIL;
3667 : 119 : i = 0;
3668 [ + - + + : 395 : foreach(lc, fexpr->args)
+ + ]
3669 : : {
3670 : 276 : Node *n = lfirst(lc);
3671 : :
3672 [ + + + - ]: 276 : switch (argmodes[i])
3673 : : {
3674 : 91 : case PROARGMODE_IN:
3675 : : case PROARGMODE_VARIADIC:
3676 : 91 : inargs = lappend(inargs, n);
3677 : 91 : break;
3678 : 72 : case PROARGMODE_OUT:
3679 : 72 : outargs = lappend(outargs, n);
3680 : 72 : break;
3681 : 113 : case PROARGMODE_INOUT:
3682 : 113 : inargs = lappend(inargs, n);
3683 : 113 : outargs = lappend(outargs, copyObject(n));
3684 : 113 : break;
3685 : 0 : default:
3686 : : /* note we don't support PROARGMODE_TABLE */
3687 [ # # ]: 0 : elog(ERROR, "invalid argmode %c for procedure",
3688 : : argmodes[i]);
3689 : : break;
3690 : : }
3691 : 276 : i++;
3692 : : }
3693 : 119 : fexpr->args = inargs;
3694 : : }
3695 : :
3696 : 292 : stmt->funcexpr = fexpr;
3697 : 292 : stmt->outargs = outargs;
3698 : :
3699 : 292 : ReleaseSysCache(proctup);
3700 : :
3701 : : /* represent the command as a utility Query */
3702 : 292 : result = makeNode(Query);
3703 : 292 : result->commandType = CMD_UTILITY;
3704 : 292 : result->utilityStmt = (Node *) stmt;
3705 : :
3706 : 292 : return result;
3707 : : }
3708 : :
3709 : : /*
3710 : : * Produce a string representation of a LockClauseStrength value.
3711 : : * This should only be applied to valid values (not LCS_NONE).
3712 : : */
3713 : : const char *
3714 : 36 : LCS_asString(LockClauseStrength strength)
3715 : : {
3716 [ - - - + : 36 : switch (strength)
+ - ]
3717 : : {
3718 : 0 : case LCS_NONE:
3719 : : Assert(false);
3720 : 0 : break;
3721 : 0 : case LCS_FORKEYSHARE:
3722 : 0 : return "FOR KEY SHARE";
3723 : 0 : case LCS_FORSHARE:
3724 : 0 : return "FOR SHARE";
3725 : 4 : case LCS_FORNOKEYUPDATE:
3726 : 4 : return "FOR NO KEY UPDATE";
3727 : 32 : case LCS_FORUPDATE:
3728 : 32 : return "FOR UPDATE";
3729 : : }
3730 : 0 : return "FOR some"; /* shouldn't happen */
3731 : : }
3732 : :
3733 : : /*
3734 : : * Check for features that are not supported with FOR [KEY] UPDATE/SHARE.
3735 : : *
3736 : : * exported so planner can check again after rewriting, query pullup, etc
3737 : : */
3738 : : void
3739 : 11617 : CheckSelectLocking(Query *qry, LockClauseStrength strength)
3740 : : {
3741 : : Assert(strength != LCS_NONE); /* else caller error */
3742 : :
3743 [ - + ]: 11617 : if (qry->setOperations)
3744 [ # # ]: 0 : ereport(ERROR,
3745 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3746 : : /*------
3747 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3748 : : errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT",
3749 : : LCS_asString(strength))));
3750 [ - + ]: 11617 : if (qry->distinctClause != NIL)
3751 [ # # ]: 0 : ereport(ERROR,
3752 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3753 : : /*------
3754 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3755 : : errmsg("%s is not allowed with DISTINCT clause",
3756 : : LCS_asString(strength))));
3757 [ + + + + ]: 11617 : if (qry->groupClause != NIL || qry->groupingSets != NIL)
3758 [ + - ]: 8 : ereport(ERROR,
3759 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3760 : : /*------
3761 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3762 : : errmsg("%s is not allowed with GROUP BY clause",
3763 : : LCS_asString(strength))));
3764 [ - + ]: 11609 : if (qry->havingQual != NULL)
3765 [ # # ]: 0 : ereport(ERROR,
3766 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3767 : : /*------
3768 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3769 : : errmsg("%s is not allowed with HAVING clause",
3770 : : LCS_asString(strength))));
3771 [ + + ]: 11609 : if (qry->hasAggs)
3772 [ + - ]: 4 : ereport(ERROR,
3773 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3774 : : /*------
3775 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3776 : : errmsg("%s is not allowed with aggregate functions",
3777 : : LCS_asString(strength))));
3778 [ - + ]: 11605 : if (qry->hasWindowFuncs)
3779 [ # # ]: 0 : ereport(ERROR,
3780 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3781 : : /*------
3782 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3783 : : errmsg("%s is not allowed with window functions",
3784 : : LCS_asString(strength))));
3785 [ - + ]: 11605 : if (qry->hasTargetSRFs)
3786 [ # # ]: 0 : ereport(ERROR,
3787 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3788 : : /*------
3789 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3790 : : errmsg("%s is not allowed with set-returning functions in the target list",
3791 : : LCS_asString(strength))));
3792 : 11605 : }
3793 : :
3794 : : /*
3795 : : * Transform a FOR [KEY] UPDATE/SHARE clause
3796 : : *
3797 : : * This basically involves replacing names by integer relids.
3798 : : *
3799 : : * NB: if you need to change this, see also markQueryForLocking()
3800 : : * in rewriteHandler.c, and isLockedRefname() in parse_relation.c.
3801 : : */
3802 : : static void
3803 : 5042 : transformLockingClause(ParseState *pstate, Query *qry, LockingClause *lc,
3804 : : bool pushedDown)
3805 : : {
3806 : 5042 : List *lockedRels = lc->lockedRels;
3807 : : ListCell *l;
3808 : : ListCell *rt;
3809 : : Index i;
3810 : : LockingClause *allrels;
3811 : :
3812 : 5042 : CheckSelectLocking(qry, lc->strength);
3813 : :
3814 : : /* make a clause we can pass down to subqueries to select all rels */
3815 : 5030 : allrels = makeNode(LockingClause);
3816 : 5030 : allrels->lockedRels = NIL; /* indicates all rels */
3817 : 5030 : allrels->strength = lc->strength;
3818 : 5030 : allrels->waitPolicy = lc->waitPolicy;
3819 : :
3820 [ + + ]: 5030 : if (lockedRels == NIL)
3821 : : {
3822 : : /*
3823 : : * Lock all regular tables used in query and its subqueries. We
3824 : : * examine inFromCl to exclude auto-added RTEs, particularly NEW/OLD
3825 : : * in rules. This is a bit of an abuse of a mostly-obsolete flag, but
3826 : : * it's convenient. We can't rely on the namespace mechanism that has
3827 : : * largely replaced inFromCl, since for example we need to lock
3828 : : * base-relation RTEs even if they are masked by upper joins.
3829 : : */
3830 : 3808 : i = 0;
3831 [ + + + + : 7666 : foreach(rt, qry->rtable)
+ + ]
3832 : : {
3833 : 3858 : RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
3834 : :
3835 : 3858 : ++i;
3836 [ + + ]: 3858 : if (!rte->inFromCl)
3837 : 8 : continue;
3838 [ + - + ]: 3850 : switch (rte->rtekind)
3839 : : {
3840 : 3830 : case RTE_RELATION:
3841 : : {
3842 : : RTEPermissionInfo *perminfo;
3843 : :
3844 : 3830 : applyLockingClause(qry, i,
3845 : : lc->strength,
3846 : : lc->waitPolicy,
3847 : : pushedDown);
3848 : 3830 : perminfo = getRTEPermissionInfo(qry->rteperminfos, rte);
3849 : 3830 : perminfo->requiredPerms |= ACL_SELECT_FOR_UPDATE;
3850 : : }
3851 : 3830 : break;
3852 : 0 : case RTE_SUBQUERY:
3853 : 0 : applyLockingClause(qry, i, lc->strength, lc->waitPolicy,
3854 : : pushedDown);
3855 : :
3856 : : /*
3857 : : * FOR UPDATE/SHARE of subquery is propagated to all of
3858 : : * subquery's rels, too. We could do this later (based on
3859 : : * the marking of the subquery RTE) but it is convenient
3860 : : * to have local knowledge in each query level about which
3861 : : * rels need to be opened with RowShareLock.
3862 : : */
3863 : 0 : transformLockingClause(pstate, rte->subquery,
3864 : : allrels, true);
3865 : 0 : break;
3866 : 20 : default:
3867 : : /* ignore all other RTE kinds */
3868 : 20 : break;
3869 : : }
3870 : : }
3871 : : }
3872 : : else
3873 : : {
3874 : : /*
3875 : : * Lock just the named tables. As above, we allow locking any base
3876 : : * relation regardless of alias-visibility rules, so we need to
3877 : : * examine inFromCl to exclude OLD/NEW.
3878 : : */
3879 [ + - + + : 2430 : foreach(l, lockedRels)
+ + ]
3880 : : {
3881 : 1228 : RangeVar *thisrel = (RangeVar *) lfirst(l);
3882 : :
3883 : : /* For simplicity we insist on unqualified alias names here */
3884 [ + - - + ]: 1228 : if (thisrel->catalogname || thisrel->schemaname)
3885 [ # # ]: 0 : ereport(ERROR,
3886 : : (errcode(ERRCODE_SYNTAX_ERROR),
3887 : : /*------
3888 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3889 : : errmsg("%s must specify unqualified relation names",
3890 : : LCS_asString(lc->strength)),
3891 : : parser_errposition(pstate, thisrel->location)));
3892 : :
3893 : 1228 : i = 0;
3894 [ + - + + : 1422 : foreach(rt, qry->rtable)
+ + ]
3895 : : {
3896 : 1414 : RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
3897 : 1414 : char *rtename = rte->eref->aliasname;
3898 : :
3899 : 1414 : ++i;
3900 [ + + ]: 1414 : if (!rte->inFromCl)
3901 : 16 : continue;
3902 : :
3903 : : /*
3904 : : * A join RTE without an alias is not visible as a relation
3905 : : * name and needs to be skipped (otherwise it might hide a
3906 : : * base relation with the same name), except if it has a USING
3907 : : * alias, which *is* visible.
3908 : : *
3909 : : * Subquery and values RTEs without aliases are never visible
3910 : : * as relation names and must always be skipped.
3911 : : */
3912 [ + + ]: 1398 : if (rte->alias == NULL)
3913 : : {
3914 [ + + ]: 109 : if (rte->rtekind == RTE_JOIN)
3915 : : {
3916 [ + + ]: 40 : if (rte->join_using_alias == NULL)
3917 : 32 : continue;
3918 : 8 : rtename = rte->join_using_alias->aliasname;
3919 : : }
3920 [ + + ]: 69 : else if (rte->rtekind == RTE_SUBQUERY ||
3921 [ - + ]: 65 : rte->rtekind == RTE_VALUES)
3922 : 4 : continue;
3923 : : }
3924 : :
3925 [ + + ]: 1362 : if (strcmp(rtename, thisrel->relname) == 0)
3926 : : {
3927 [ + + + - : 1220 : switch (rte->rtekind)
- - - - +
- ]
3928 : : {
3929 : 1202 : case RTE_RELATION:
3930 : : {
3931 : : RTEPermissionInfo *perminfo;
3932 : :
3933 : 1202 : applyLockingClause(qry, i,
3934 : : lc->strength,
3935 : : lc->waitPolicy,
3936 : : pushedDown);
3937 : 1202 : perminfo = getRTEPermissionInfo(qry->rteperminfos, rte);
3938 : 1202 : perminfo->requiredPerms |= ACL_SELECT_FOR_UPDATE;
3939 : : }
3940 : 1202 : break;
3941 : 6 : case RTE_SUBQUERY:
3942 : 6 : applyLockingClause(qry, i, lc->strength,
3943 : : lc->waitPolicy, pushedDown);
3944 : : /* see comment above */
3945 : 6 : transformLockingClause(pstate, rte->subquery,
3946 : : allrels, true);
3947 : 6 : break;
3948 : 8 : case RTE_JOIN:
3949 [ + - ]: 8 : ereport(ERROR,
3950 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3951 : : /*------
3952 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3953 : : errmsg("%s cannot be applied to a join",
3954 : : LCS_asString(lc->strength)),
3955 : : parser_errposition(pstate, thisrel->location)));
3956 : : break;
3957 : 0 : case RTE_FUNCTION:
3958 [ # # ]: 0 : ereport(ERROR,
3959 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3960 : : /*------
3961 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3962 : : errmsg("%s cannot be applied to a function",
3963 : : LCS_asString(lc->strength)),
3964 : : parser_errposition(pstate, thisrel->location)));
3965 : : break;
3966 : 0 : case RTE_TABLEFUNC:
3967 [ # # ]: 0 : ereport(ERROR,
3968 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3969 : : /*------
3970 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3971 : : errmsg("%s cannot be applied to a table function",
3972 : : LCS_asString(lc->strength)),
3973 : : parser_errposition(pstate, thisrel->location)));
3974 : : break;
3975 : 0 : case RTE_VALUES:
3976 [ # # ]: 0 : ereport(ERROR,
3977 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3978 : : /*------
3979 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3980 : : errmsg("%s cannot be applied to VALUES",
3981 : : LCS_asString(lc->strength)),
3982 : : parser_errposition(pstate, thisrel->location)));
3983 : : break;
3984 : 0 : case RTE_CTE:
3985 [ # # ]: 0 : ereport(ERROR,
3986 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3987 : : /*------
3988 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3989 : : errmsg("%s cannot be applied to a WITH query",
3990 : : LCS_asString(lc->strength)),
3991 : : parser_errposition(pstate, thisrel->location)));
3992 : : break;
3993 : 0 : case RTE_NAMEDTUPLESTORE:
3994 [ # # ]: 0 : ereport(ERROR,
3995 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3996 : : /*------
3997 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
3998 : : errmsg("%s cannot be applied to a named tuplestore",
3999 : : LCS_asString(lc->strength)),
4000 : : parser_errposition(pstate, thisrel->location)));
4001 : : break;
4002 : 4 : case RTE_GRAPH_TABLE:
4003 [ + - ]: 4 : ereport(ERROR,
4004 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4005 : : /*------
4006 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
4007 : : errmsg("%s cannot be applied to GRAPH_TABLE",
4008 : : LCS_asString(lc->strength)),
4009 : : parser_errposition(pstate, thisrel->location)));
4010 : : break;
4011 : :
4012 : : /* Shouldn't be possible to see RTE_RESULT here */
4013 : :
4014 : 0 : default:
4015 [ # # ]: 0 : elog(ERROR, "unrecognized RTE type: %d",
4016 : : (int) rte->rtekind);
4017 : : break;
4018 : : }
4019 : 1208 : break; /* out of foreach loop */
4020 : : }
4021 : : }
4022 [ + + ]: 1216 : if (rt == NULL)
4023 [ + - ]: 8 : ereport(ERROR,
4024 : : (errcode(ERRCODE_UNDEFINED_TABLE),
4025 : : /*------
4026 : : translator: %s is a SQL row locking clause such as FOR UPDATE */
4027 : : errmsg("relation \"%s\" in %s clause not found in FROM clause",
4028 : : thisrel->relname,
4029 : : LCS_asString(lc->strength)),
4030 : : parser_errposition(pstate, thisrel->location)));
4031 : : }
4032 : : }
4033 : 5010 : }
4034 : :
4035 : : /*
4036 : : * Record locking info for a single rangetable item
4037 : : */
4038 : : void
4039 : 5102 : applyLockingClause(Query *qry, Index rtindex,
4040 : : LockClauseStrength strength, LockWaitPolicy waitPolicy,
4041 : : bool pushedDown)
4042 : : {
4043 : : RowMarkClause *rc;
4044 : :
4045 : : Assert(strength != LCS_NONE); /* else caller error */
4046 : :
4047 : : /* If it's an explicit clause, make sure hasForUpdate gets set */
4048 [ + + ]: 5102 : if (!pushedDown)
4049 : 5036 : qry->hasForUpdate = true;
4050 : :
4051 : : /* Check for pre-existing entry for same rtindex */
4052 [ - + ]: 5102 : if ((rc = get_parse_rowmark(qry, rtindex)) != NULL)
4053 : : {
4054 : : /*
4055 : : * If the same RTE is specified with more than one locking strength,
4056 : : * use the strongest. (Reasonable, since you can't take both a shared
4057 : : * and exclusive lock at the same time; it'll end up being exclusive
4058 : : * anyway.)
4059 : : *
4060 : : * Similarly, if the same RTE is specified with more than one lock
4061 : : * wait policy, consider that NOWAIT wins over SKIP LOCKED, which in
4062 : : * turn wins over waiting for the lock (the default). This is a bit
4063 : : * more debatable but raising an error doesn't seem helpful. (Consider
4064 : : * for instance SELECT FOR UPDATE NOWAIT from a view that internally
4065 : : * contains a plain FOR UPDATE spec.) Having NOWAIT win over SKIP
4066 : : * LOCKED is reasonable since the former throws an error in case of
4067 : : * coming across a locked tuple, which may be undesirable in some
4068 : : * cases but it seems better than silently returning inconsistent
4069 : : * results.
4070 : : *
4071 : : * And of course pushedDown becomes false if any clause is explicit.
4072 : : */
4073 : 0 : rc->strength = Max(rc->strength, strength);
4074 : 0 : rc->waitPolicy = Max(rc->waitPolicy, waitPolicy);
4075 : 0 : rc->pushedDown &= pushedDown;
4076 : 0 : return;
4077 : : }
4078 : :
4079 : : /* Make a new RowMarkClause */
4080 : 5102 : rc = makeNode(RowMarkClause);
4081 : 5102 : rc->rti = rtindex;
4082 : 5102 : rc->strength = strength;
4083 : 5102 : rc->waitPolicy = waitPolicy;
4084 : 5102 : rc->pushedDown = pushedDown;
4085 : 5102 : qry->rowMarks = lappend(qry->rowMarks, rc);
4086 : : }
4087 : :
4088 : : #ifdef DEBUG_NODE_TESTS_ENABLED
4089 : : /*
4090 : : * Coverage testing for raw_expression_tree_walker().
4091 : : *
4092 : : * When enabled, we run raw_expression_tree_walker() over every DML statement
4093 : : * submitted to parse analysis. Without this provision, that function is only
4094 : : * applied in limited cases involving CTEs, and we don't really want to have
4095 : : * to test everything inside as well as outside a CTE.
4096 : : */
4097 : : static bool
4098 : 17333224 : test_raw_expression_coverage(Node *node, void *context)
4099 : : {
4100 [ + + ]: 17333224 : if (node == NULL)
4101 : 9347781 : return false;
4102 : 7985443 : return raw_expression_tree_walker(node,
4103 : : test_raw_expression_coverage,
4104 : : context);
4105 : : }
4106 : : #endif /* DEBUG_NODE_TESTS_ENABLED */
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