/Users/deen/code/yugabyte-db/src/postgres/src/backend/parser/analyze.c
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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) 1996-2018, 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/sysattr.h" |
28 | | #include "access/xact.h" |
29 | | #include "catalog/catalog.h" |
30 | | #include "catalog/pg_type.h" |
31 | | #include "commands/dbcommands.h" |
32 | | #include "miscadmin.h" |
33 | | #include "nodes/makefuncs.h" |
34 | | #include "nodes/nodeFuncs.h" |
35 | | #include "optimizer/var.h" |
36 | | #include "parser/analyze.h" |
37 | | #include "parser/parse_agg.h" |
38 | | #include "parser/parse_clause.h" |
39 | | #include "parser/parse_coerce.h" |
40 | | #include "parser/parse_collate.h" |
41 | | #include "parser/parse_cte.h" |
42 | | #include "parser/parse_expr.h" |
43 | | #include "parser/parse_func.h" |
44 | | #include "parser/parse_oper.h" |
45 | | #include "parser/parse_param.h" |
46 | | #include "parser/parse_relation.h" |
47 | | #include "parser/parse_target.h" |
48 | | #include "parser/parsetree.h" |
49 | | #include "rewrite/rewriteManip.h" |
50 | | #include "utils/rel.h" |
51 | | |
52 | | #include "pg_yb_utils.h" |
53 | | |
54 | | /* Hook for plugins to get control at end of parse analysis */ |
55 | | post_parse_analyze_hook_type post_parse_analyze_hook = NULL; |
56 | | |
57 | | static Query *transformOptionalSelectInto(ParseState *pstate, Node *parseTree); |
58 | | static Query *transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt); |
59 | | static Query *transformInsertStmt(ParseState *pstate, InsertStmt *stmt); |
60 | | static List *transformInsertRow(ParseState *pstate, List *exprlist, |
61 | | List *stmtcols, List *icolumns, List *attrnos, |
62 | | bool strip_indirection); |
63 | | static OnConflictExpr *transformOnConflictClause(ParseState *pstate, |
64 | | OnConflictClause *onConflictClause); |
65 | | static int count_rowexpr_columns(ParseState *pstate, Node *expr); |
66 | | static Query *transformSelectStmt(ParseState *pstate, SelectStmt *stmt); |
67 | | static Query *transformValuesClause(ParseState *pstate, SelectStmt *stmt); |
68 | | static Query *transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt); |
69 | | static Node *transformSetOperationTree(ParseState *pstate, SelectStmt *stmt, |
70 | | bool isTopLevel, List **targetlist); |
71 | | static void determineRecursiveColTypes(ParseState *pstate, |
72 | | Node *larg, List *nrtargetlist); |
73 | | static Query *transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt); |
74 | | static List *transformReturningList(ParseState *pstate, List *returningList); |
75 | | static List *transformUpdateTargetList(ParseState *pstate, |
76 | | List *targetList); |
77 | | static Query *transformDeclareCursorStmt(ParseState *pstate, |
78 | | DeclareCursorStmt *stmt); |
79 | | static Query *transformExplainStmt(ParseState *pstate, |
80 | | ExplainStmt *stmt); |
81 | | static Query *transformCreateTableAsStmt(ParseState *pstate, |
82 | | CreateTableAsStmt *stmt); |
83 | | static Query *transformCallStmt(ParseState *pstate, |
84 | | CallStmt *stmt); |
85 | | static void transformLockingClause(ParseState *pstate, Query *qry, |
86 | | LockingClause *lc, bool pushedDown); |
87 | | #ifdef RAW_EXPRESSION_COVERAGE_TEST |
88 | | static bool test_raw_expression_coverage(Node *node, void *context); |
89 | | #endif |
90 | | |
91 | | |
92 | | /* |
93 | | * parse_analyze |
94 | | * Analyze a raw parse tree and transform it to Query form. |
95 | | * |
96 | | * Optionally, information about $n parameter types can be supplied. |
97 | | * References to $n indexes not defined by paramTypes[] are disallowed. |
98 | | * |
99 | | * The result is a Query node. Optimizable statements require considerable |
100 | | * transformation, while utility-type statements are simply hung off |
101 | | * a dummy CMD_UTILITY Query node. |
102 | | */ |
103 | | Query * |
104 | | parse_analyze(RawStmt *parseTree, const char *sourceText, |
105 | | Oid *paramTypes, int numParams, |
106 | | QueryEnvironment *queryEnv) |
107 | 151k | { |
108 | 151k | ParseState *pstate = make_parsestate(NULL); |
109 | 151k | Query *query; |
110 | | |
111 | 151k | Assert(sourceText != NULL); /* required as of 8.4 */ |
112 | | |
113 | 151k | pstate->p_sourcetext = sourceText; |
114 | | |
115 | 151k | if (numParams > 0) |
116 | 229 | parse_fixed_parameters(pstate, paramTypes, numParams); |
117 | | |
118 | 151k | pstate->p_queryEnv = queryEnv; |
119 | | |
120 | 151k | query = transformTopLevelStmt(pstate, parseTree); |
121 | | |
122 | 151k | if (pstate->p_target_relation && |
123 | 151k | pstate->p_target_relation->rd_rel->relpersistence == 52.9k RELPERSISTENCE_TEMP52.9k |
124 | 151k | && IsYugaByteEnabled()326 ) |
125 | 326 | { |
126 | 326 | SetTxnWithPGRel(); |
127 | 326 | } |
128 | | |
129 | 151k | if (post_parse_analyze_hook) |
130 | 148k | (*post_parse_analyze_hook) (pstate, query); |
131 | | |
132 | 151k | free_parsestate(pstate); |
133 | | |
134 | 151k | return query; |
135 | 151k | } |
136 | | |
137 | | /* |
138 | | * parse_analyze_varparams |
139 | | * |
140 | | * This variant is used when it's okay to deduce information about $n |
141 | | * symbol datatypes from context. The passed-in paramTypes[] array can |
142 | | * be modified or enlarged (via repalloc). |
143 | | */ |
144 | | Query * |
145 | | parse_analyze_varparams(RawStmt *parseTree, const char *sourceText, |
146 | | Oid **paramTypes, int *numParams) |
147 | 408k | { |
148 | 408k | ParseState *pstate = make_parsestate(NULL); |
149 | 408k | Query *query; |
150 | | |
151 | 408k | Assert(sourceText != NULL); /* required as of 8.4 */ |
152 | | |
153 | 408k | pstate->p_sourcetext = sourceText; |
154 | | |
155 | 408k | parse_variable_parameters(pstate, paramTypes, numParams); |
156 | | |
157 | 408k | query = transformTopLevelStmt(pstate, parseTree); |
158 | | |
159 | 408k | if (pstate->p_target_relation && |
160 | 408k | pstate->p_target_relation->rd_rel->relpersistence == 245k RELPERSISTENCE_TEMP245k |
161 | 408k | && IsYugaByteEnabled()66 ) |
162 | 66 | { |
163 | 66 | SetTxnWithPGRel(); |
164 | 66 | } |
165 | | |
166 | | /* make sure all is well with parameter types */ |
167 | 408k | check_variable_parameters(pstate, query); |
168 | | |
169 | 408k | if (post_parse_analyze_hook) |
170 | 407k | (*post_parse_analyze_hook) (pstate, query); |
171 | | |
172 | 408k | free_parsestate(pstate); |
173 | | |
174 | 408k | return query; |
175 | 408k | } |
176 | | |
177 | | /* |
178 | | * parse_sub_analyze |
179 | | * Entry point for recursively analyzing a sub-statement. |
180 | | */ |
181 | | Query * |
182 | | parse_sub_analyze(Node *parseTree, ParseState *parentParseState, |
183 | | CommonTableExpr *parentCTE, |
184 | | bool locked_from_parent, |
185 | | bool resolve_unknowns) |
186 | 16.2k | { |
187 | 16.2k | ParseState *pstate = make_parsestate(parentParseState); |
188 | 16.2k | Query *query; |
189 | | |
190 | 16.2k | pstate->p_parent_cte = parentCTE; |
191 | 16.2k | pstate->p_locked_from_parent = locked_from_parent; |
192 | 16.2k | pstate->p_resolve_unknowns = resolve_unknowns; |
193 | | |
194 | 16.2k | query = transformStmt(pstate, parseTree); |
195 | | |
196 | 16.2k | free_parsestate(pstate); |
197 | | |
198 | 16.2k | return query; |
199 | 16.2k | } |
200 | | |
201 | | /* |
202 | | * transformTopLevelStmt - |
203 | | * transform a Parse tree into a Query tree. |
204 | | * |
205 | | * This function is just responsible for transferring statement location data |
206 | | * from the RawStmt into the finished Query. |
207 | | */ |
208 | | Query * |
209 | | transformTopLevelStmt(ParseState *pstate, RawStmt *parseTree) |
210 | 572k | { |
211 | 572k | Query *result; |
212 | | |
213 | | /* We're at top level, so allow SELECT INTO */ |
214 | 572k | result = transformOptionalSelectInto(pstate, parseTree->stmt); |
215 | | |
216 | 572k | result->stmt_location = parseTree->stmt_location; |
217 | 572k | result->stmt_len = parseTree->stmt_len; |
218 | | |
219 | 572k | return result; |
220 | 572k | } |
221 | | |
222 | | /* |
223 | | * transformOptionalSelectInto - |
224 | | * If SELECT has INTO, convert it to CREATE TABLE AS. |
225 | | * |
226 | | * The only thing we do here that we don't do in transformStmt() is to |
227 | | * convert SELECT ... INTO into CREATE TABLE AS. Since utility statements |
228 | | * aren't allowed within larger statements, this is only allowed at the top |
229 | | * of the parse tree, and so we only try it before entering the recursive |
230 | | * transformStmt() processing. |
231 | | */ |
232 | | static Query * |
233 | | transformOptionalSelectInto(ParseState *pstate, Node *parseTree) |
234 | 575k | { |
235 | 575k | if (IsA(parseTree, SelectStmt)) |
236 | 124k | { |
237 | 124k | SelectStmt *stmt = (SelectStmt *) parseTree; |
238 | | |
239 | | /* If it's a set-operation tree, drill down to leftmost SelectStmt */ |
240 | 126k | while (stmt126k && stmt->op != SETOP_NONE) |
241 | 1.87k | stmt = stmt->larg; |
242 | 124k | Assert(stmt && IsA(stmt, SelectStmt) &&stmt->larg == NULL); |
243 | | |
244 | 124k | if (stmt->intoClause) |
245 | 3 | { |
246 | 3 | CreateTableAsStmt *ctas = makeNode(CreateTableAsStmt); |
247 | | |
248 | 0 | ctas->query = parseTree; |
249 | 3 | ctas->into = stmt->intoClause; |
250 | 3 | ctas->relkind = OBJECT_TABLE; |
251 | 3 | ctas->is_select_into = true; |
252 | | |
253 | | /* |
254 | | * Remove the intoClause from the SelectStmt. This makes it safe |
255 | | * for transformSelectStmt to complain if it finds intoClause set |
256 | | * (implying that the INTO appeared in a disallowed place). |
257 | | */ |
258 | 3 | stmt->intoClause = NULL; |
259 | | |
260 | 3 | parseTree = (Node *) ctas; |
261 | 3 | } |
262 | 124k | } |
263 | | |
264 | 575k | return transformStmt(pstate, parseTree); |
265 | 575k | } |
266 | | |
267 | | /* |
268 | | * transformStmt - |
269 | | * recursively transform a Parse tree into a Query tree. |
270 | | */ |
271 | | Query * |
272 | | transformStmt(ParseState *pstate, Node *parseTree) |
273 | 594k | { |
274 | 594k | Query *result; |
275 | | |
276 | | /* |
277 | | * We apply RAW_EXPRESSION_COVERAGE_TEST testing to basic DML statements; |
278 | | * we can't just run it on everything because raw_expression_tree_walker() |
279 | | * doesn't claim to handle utility statements. |
280 | | */ |
281 | | #ifdef RAW_EXPRESSION_COVERAGE_TEST |
282 | | switch (nodeTag(parseTree)) |
283 | | { |
284 | | case T_SelectStmt: |
285 | | case T_InsertStmt: |
286 | | case T_UpdateStmt: |
287 | | case T_DeleteStmt: |
288 | | (void) test_raw_expression_coverage(parseTree, NULL); |
289 | | break; |
290 | | default: |
291 | | break; |
292 | | } |
293 | | #endif /* RAW_EXPRESSION_COVERAGE_TEST */ |
294 | | |
295 | 594k | switch (nodeTag(parseTree)) |
296 | 594k | { |
297 | | /* |
298 | | * Optimizable statements |
299 | | */ |
300 | 271k | case T_InsertStmt: |
301 | 271k | result = transformInsertStmt(pstate, (InsertStmt *) parseTree); |
302 | 271k | break; |
303 | | |
304 | 4.41k | case T_DeleteStmt: |
305 | 4.41k | result = transformDeleteStmt(pstate, (DeleteStmt *) parseTree); |
306 | 4.41k | break; |
307 | | |
308 | 29.3k | case T_UpdateStmt: |
309 | 29.3k | result = transformUpdateStmt(pstate, (UpdateStmt *) parseTree); |
310 | 29.3k | break; |
311 | | |
312 | 141k | case T_SelectStmt: |
313 | 141k | { |
314 | 141k | SelectStmt *n = (SelectStmt *) parseTree; |
315 | | |
316 | 141k | if (n->valuesLists) |
317 | 1.23k | result = transformValuesClause(pstate, n); |
318 | 140k | else if (n->op == SETOP_NONE) |
319 | 139k | result = transformSelectStmt(pstate, n); |
320 | 470 | else |
321 | 470 | result = transformSetOperationStmt(pstate, n); |
322 | 141k | } |
323 | 141k | break; |
324 | | |
325 | | /* |
326 | | * Special cases |
327 | | */ |
328 | 1.55k | case T_DeclareCursorStmt: |
329 | 1.55k | result = transformDeclareCursorStmt(pstate, |
330 | 1.55k | (DeclareCursorStmt *) parseTree); |
331 | 1.55k | break; |
332 | | |
333 | 2.73k | case T_ExplainStmt: |
334 | 2.73k | result = transformExplainStmt(pstate, |
335 | 2.73k | (ExplainStmt *) parseTree); |
336 | 2.73k | break; |
337 | | |
338 | 110 | case T_CreateTableAsStmt: |
339 | 110 | result = transformCreateTableAsStmt(pstate, |
340 | 110 | (CreateTableAsStmt *) parseTree); |
341 | 110 | break; |
342 | | |
343 | 426 | case T_CallStmt: |
344 | 426 | result = transformCallStmt(pstate, |
345 | 426 | (CallStmt *) parseTree); |
346 | 426 | break; |
347 | | |
348 | 143k | default: |
349 | | |
350 | | /* |
351 | | * other statements don't require any transformation; just return |
352 | | * the original parsetree with a Query node plastered on top. |
353 | | */ |
354 | 143k | result = makeNode(Query); |
355 | 0 | result->commandType = CMD_UTILITY; |
356 | 143k | result->utilityStmt = (Node *) parseTree; |
357 | 143k | break; |
358 | 594k | } |
359 | | |
360 | | /* Mark as original query until we learn differently */ |
361 | 593k | result->querySource = QSRC_ORIGINAL; |
362 | 593k | result->canSetTag = true; |
363 | | |
364 | 593k | return result; |
365 | 594k | } |
366 | | |
367 | | /* |
368 | | * analyze_requires_snapshot |
369 | | * Returns true if a snapshot must be set before doing parse analysis |
370 | | * on the given raw parse tree. |
371 | | * |
372 | | * Classification here should match transformStmt(). |
373 | | */ |
374 | | bool |
375 | | analyze_requires_snapshot(RawStmt *parseTree) |
376 | 1.05M | { |
377 | 1.05M | bool result; |
378 | | |
379 | 1.05M | switch (nodeTag(parseTree->stmt)) |
380 | 1.05M | { |
381 | | /* |
382 | | * Optimizable statements |
383 | | */ |
384 | 512k | case T_InsertStmt: |
385 | 517k | case T_DeleteStmt: |
386 | 543k | case T_UpdateStmt: |
387 | 742k | case T_SelectStmt: |
388 | 742k | result = true; |
389 | 742k | break; |
390 | | |
391 | | /* |
392 | | * Special cases |
393 | | */ |
394 | 1.75k | case T_DeclareCursorStmt: |
395 | 5.15k | case T_ExplainStmt: |
396 | 5.24k | case T_CreateTableAsStmt: |
397 | | /* yes, because we must analyze the contained statement */ |
398 | 5.24k | result = true; |
399 | 5.24k | break; |
400 | | |
401 | 2.27k | case T_BackfillIndexStmt: |
402 | 2.27k | result = false; |
403 | 2.27k | break; |
404 | | |
405 | 304k | default: |
406 | | /* other utility statements don't have any real parse analysis */ |
407 | 304k | result = false; |
408 | 304k | break; |
409 | 1.05M | } |
410 | | |
411 | 1.05M | return result; |
412 | 1.05M | } |
413 | | |
414 | | /* |
415 | | * transformDeleteStmt - |
416 | | * transforms a Delete Statement |
417 | | */ |
418 | | static Query * |
419 | | transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt) |
420 | 4.41k | { |
421 | 4.41k | Query *qry = makeNode(Query); |
422 | 0 | ParseNamespaceItem *nsitem; |
423 | 4.41k | Node *qual; |
424 | | |
425 | 4.41k | qry->commandType = CMD_DELETE; |
426 | | |
427 | | /* process the WITH clause independently of all else */ |
428 | 4.41k | if (stmt->withClause) |
429 | 1 | { |
430 | 1 | qry->hasRecursive = stmt->withClause->recursive; |
431 | 1 | qry->cteList = transformWithClause(pstate, stmt->withClause); |
432 | 1 | qry->hasModifyingCTE = pstate->p_hasModifyingCTE; |
433 | 1 | } |
434 | | |
435 | | /* set up range table with just the result rel */ |
436 | 4.41k | qry->resultRelation = setTargetTable(pstate, stmt->relation, |
437 | 4.41k | stmt->relation->inh, |
438 | 4.41k | true, |
439 | 4.41k | ACL_DELETE); |
440 | | |
441 | | /* grab the namespace item made by setTargetTable */ |
442 | 4.41k | nsitem = (ParseNamespaceItem *) llast(pstate->p_namespace); |
443 | | |
444 | | /* there's no DISTINCT in DELETE */ |
445 | 4.41k | qry->distinctClause = NIL; |
446 | | |
447 | | /* subqueries in USING cannot access the result relation */ |
448 | 4.41k | nsitem->p_lateral_only = true; |
449 | 4.41k | nsitem->p_lateral_ok = false; |
450 | | |
451 | | /* |
452 | | * The USING clause is non-standard SQL syntax, and is equivalent in |
453 | | * functionality to the FROM list that can be specified for UPDATE. The |
454 | | * USING keyword is used rather than FROM because FROM is already a |
455 | | * keyword in the DELETE syntax. |
456 | | */ |
457 | 4.41k | transformFromClause(pstate, stmt->usingClause); |
458 | | |
459 | | /* remaining clauses can reference the result relation normally */ |
460 | 4.41k | nsitem->p_lateral_only = false; |
461 | 4.41k | nsitem->p_lateral_ok = true; |
462 | | |
463 | 4.41k | qual = transformWhereClause(pstate, stmt->whereClause, |
464 | 4.41k | EXPR_KIND_WHERE, "WHERE"); |
465 | | |
466 | 4.41k | qry->returningList = transformReturningList(pstate, stmt->returningList); |
467 | | |
468 | | /* done building the range table and jointree */ |
469 | 4.41k | qry->rtable = pstate->p_rtable; |
470 | 4.41k | qry->jointree = makeFromExpr(pstate->p_joinlist, qual); |
471 | | |
472 | 4.41k | qry->hasSubLinks = pstate->p_hasSubLinks; |
473 | 4.41k | qry->hasWindowFuncs = pstate->p_hasWindowFuncs; |
474 | 4.41k | qry->hasTargetSRFs = pstate->p_hasTargetSRFs; |
475 | 4.41k | qry->hasAggs = pstate->p_hasAggs; |
476 | | |
477 | 4.41k | assign_query_collations(pstate, qry); |
478 | | |
479 | | /* this must be done after collations, for reliable comparison of exprs */ |
480 | 4.41k | if (pstate->p_hasAggs) |
481 | 0 | parseCheckAggregates(pstate, qry); |
482 | | |
483 | 4.41k | return qry; |
484 | 4.41k | } |
485 | | |
486 | | /* |
487 | | * transformInsertStmt - |
488 | | * transform an Insert Statement |
489 | | */ |
490 | | static Query * |
491 | | transformInsertStmt(ParseState *pstate, InsertStmt *stmt) |
492 | 271k | { |
493 | 271k | Query *qry = makeNode(Query); |
494 | 0 | SelectStmt *selectStmt = (SelectStmt *) stmt->selectStmt; |
495 | 271k | List *exprList = NIL; |
496 | 271k | bool isGeneralSelect; |
497 | 271k | List *sub_rtable; |
498 | 271k | List *sub_namespace; |
499 | 271k | List *icolumns; |
500 | 271k | List *attrnos; |
501 | 271k | RangeTblEntry *rte; |
502 | 271k | RangeTblRef *rtr; |
503 | 271k | ListCell *icols; |
504 | 271k | ListCell *attnos; |
505 | 271k | ListCell *lc; |
506 | 271k | bool isOnConflictUpdate; |
507 | 271k | AclMode targetPerms; |
508 | | |
509 | | /* There can't be any outer WITH to worry about */ |
510 | 271k | Assert(pstate->p_ctenamespace == NIL); |
511 | | |
512 | 271k | qry->commandType = CMD_INSERT; |
513 | 271k | pstate->p_is_insert = true; |
514 | | |
515 | | /* process the WITH clause independently of all else */ |
516 | 271k | if (stmt->withClause) |
517 | 656 | { |
518 | 656 | qry->hasRecursive = stmt->withClause->recursive; |
519 | 656 | qry->cteList = transformWithClause(pstate, stmt->withClause); |
520 | 656 | qry->hasModifyingCTE = pstate->p_hasModifyingCTE; |
521 | 656 | } |
522 | | |
523 | 271k | qry->override = stmt->override; |
524 | | |
525 | 271k | isOnConflictUpdate = (stmt->onConflictClause && |
526 | 271k | stmt->onConflictClause->action == ONCONFLICT_UPDATE7.62k ); |
527 | | |
528 | | /* |
529 | | * We have three cases to deal with: DEFAULT VALUES (selectStmt == NULL), |
530 | | * VALUES list, or general SELECT input. We special-case VALUES, both for |
531 | | * efficiency and so we can handle DEFAULT specifications. |
532 | | * |
533 | | * The grammar allows attaching ORDER BY, LIMIT, FOR UPDATE, or WITH to a |
534 | | * VALUES clause. If we have any of those, treat it as a general SELECT; |
535 | | * so it will work, but you can't use DEFAULT items together with those. |
536 | | */ |
537 | 271k | isGeneralSelect = (selectStmt && (271k selectStmt->valuesLists == 271k NIL271k || |
538 | 271k | selectStmt->sortClause != 269k NIL269k || |
539 | 271k | selectStmt->limitOffset != NULL269k || |
540 | 271k | selectStmt->limitCount != NULL269k || |
541 | 271k | selectStmt->lockingClause != 269k NIL269k || |
542 | 271k | selectStmt->withClause != NULL269k )); |
543 | | |
544 | | /* |
545 | | * If a non-nil rangetable/namespace was passed in, and we are doing |
546 | | * INSERT/SELECT, arrange to pass the rangetable/namespace down to the |
547 | | * SELECT. This can only happen if we are inside a CREATE RULE, and in |
548 | | * that case we want the rule's OLD and NEW rtable entries to appear as |
549 | | * part of the SELECT's rtable, not as outer references for it. (Kluge!) |
550 | | * The SELECT's joinlist is not affected however. We must do this before |
551 | | * adding the target table to the INSERT's rtable. |
552 | | */ |
553 | 271k | if (isGeneralSelect) |
554 | 1.16k | { |
555 | 1.16k | sub_rtable = pstate->p_rtable; |
556 | 1.16k | pstate->p_rtable = NIL; |
557 | 1.16k | sub_namespace = pstate->p_namespace; |
558 | 1.16k | pstate->p_namespace = NIL; |
559 | 1.16k | } |
560 | 269k | else |
561 | 269k | { |
562 | 269k | sub_rtable = NIL; /* not used, but keep compiler quiet */ |
563 | 269k | sub_namespace = NIL; |
564 | 269k | } |
565 | | |
566 | | /* |
567 | | * Must get write lock on INSERT target table before scanning SELECT, else |
568 | | * we will grab the wrong kind of initial lock if the target table is also |
569 | | * mentioned in the SELECT part. Note that the target table is not added |
570 | | * to the joinlist or namespace. |
571 | | */ |
572 | 271k | targetPerms = ACL_INSERT; |
573 | 271k | if (isOnConflictUpdate) |
574 | 7.35k | targetPerms |= ACL_UPDATE; |
575 | 271k | qry->resultRelation = setTargetTable(pstate, stmt->relation, |
576 | 271k | false, false, targetPerms); |
577 | | |
578 | | /* Validate stmt->cols list, or build default list if no list given */ |
579 | 271k | icolumns = checkInsertTargets(pstate, stmt->cols, &attrnos); |
580 | 271k | Assert(list_length(icolumns) == list_length(attrnos)); |
581 | | |
582 | | /* |
583 | | * Determine which variant of INSERT we have. |
584 | | */ |
585 | 271k | if (selectStmt == NULL) |
586 | 66 | { |
587 | | /* |
588 | | * We have INSERT ... DEFAULT VALUES. We can handle this case by |
589 | | * emitting an empty targetlist --- all columns will be defaulted when |
590 | | * the planner expands the targetlist. |
591 | | */ |
592 | 66 | exprList = NIL; |
593 | 66 | } |
594 | 271k | else if (isGeneralSelect) |
595 | 1.16k | { |
596 | | /* |
597 | | * We make the sub-pstate a child of the outer pstate so that it can |
598 | | * see any Param definitions supplied from above. Since the outer |
599 | | * pstate's rtable and namespace are presently empty, there are no |
600 | | * side-effects of exposing names the sub-SELECT shouldn't be able to |
601 | | * see. |
602 | | */ |
603 | 1.16k | ParseState *sub_pstate = make_parsestate(pstate); |
604 | 1.16k | Query *selectQuery; |
605 | | |
606 | | /* |
607 | | * Process the source SELECT. |
608 | | * |
609 | | * It is important that this be handled just like a standalone SELECT; |
610 | | * otherwise the behavior of SELECT within INSERT might be different |
611 | | * from a stand-alone SELECT. (Indeed, Postgres up through 6.5 had |
612 | | * bugs of just that nature...) |
613 | | * |
614 | | * The sole exception is that we prevent resolving unknown-type |
615 | | * outputs as TEXT. This does not change the semantics since if the |
616 | | * column type matters semantically, it would have been resolved to |
617 | | * something else anyway. Doing this lets us resolve such outputs as |
618 | | * the target column's type, which we handle below. |
619 | | */ |
620 | 1.16k | sub_pstate->p_rtable = sub_rtable; |
621 | 1.16k | sub_pstate->p_joinexprs = NIL; /* sub_rtable has no joins */ |
622 | 1.16k | sub_pstate->p_namespace = sub_namespace; |
623 | 1.16k | sub_pstate->p_resolve_unknowns = false; |
624 | | |
625 | 1.16k | selectQuery = transformStmt(sub_pstate, stmt->selectStmt); |
626 | | |
627 | 1.16k | free_parsestate(sub_pstate); |
628 | | |
629 | | /* The grammar should have produced a SELECT */ |
630 | 1.16k | if (!IsA(selectQuery, Query) || |
631 | 1.16k | selectQuery->commandType != CMD_SELECT) |
632 | 0 | elog(ERROR, "unexpected non-SELECT command in INSERT ... SELECT"); |
633 | | |
634 | | /* |
635 | | * Make the source be a subquery in the INSERT's rangetable, and add |
636 | | * it to the INSERT's joinlist. |
637 | | */ |
638 | 1.16k | rte = addRangeTableEntryForSubquery(pstate, |
639 | 1.16k | selectQuery, |
640 | 1.16k | makeAlias("*SELECT*", NIL), |
641 | 1.16k | false, |
642 | 1.16k | false); |
643 | 1.16k | rtr = makeNode(RangeTblRef); |
644 | | /* assume new rte is at end */ |
645 | 0 | rtr->rtindex = list_length(pstate->p_rtable); |
646 | 1.16k | Assert(rte == rt_fetch(rtr->rtindex, pstate->p_rtable)); |
647 | 1.16k | pstate->p_joinlist = lappend(pstate->p_joinlist, rtr); |
648 | | |
649 | | /*---------- |
650 | | * Generate an expression list for the INSERT that selects all the |
651 | | * non-resjunk columns from the subquery. (INSERT's tlist must be |
652 | | * separate from the subquery's tlist because we may add columns, |
653 | | * insert datatype coercions, etc.) |
654 | | * |
655 | | * HACK: unknown-type constants and params in the SELECT's targetlist |
656 | | * are copied up as-is rather than being referenced as subquery |
657 | | * outputs. This is to ensure that when we try to coerce them to |
658 | | * the target column's datatype, the right things happen (see |
659 | | * special cases in coerce_type). Otherwise, this fails: |
660 | | * INSERT INTO foo SELECT 'bar', ... FROM baz |
661 | | *---------- |
662 | | */ |
663 | 1.16k | exprList = NIL; |
664 | 1.16k | foreach(lc, selectQuery->targetList) |
665 | 3.10k | { |
666 | 3.10k | TargetEntry *tle = (TargetEntry *) lfirst(lc); |
667 | 3.10k | Expr *expr; |
668 | | |
669 | 3.10k | if (tle->resjunk) |
670 | 0 | continue; |
671 | 3.10k | if (tle->expr && |
672 | 3.10k | (IsA(tle->expr, Const) ||IsA1.25k (tle->expr, Param)) && |
673 | 3.10k | exprType((Node *) tle->expr) == 1.85k UNKNOWNOID1.85k ) |
674 | 735 | expr = tle->expr; |
675 | 2.36k | else |
676 | 2.36k | { |
677 | 2.36k | Var *var = makeVarFromTargetEntry(rtr->rtindex, tle); |
678 | | |
679 | 2.36k | var->location = exprLocation((Node *) tle->expr); |
680 | 2.36k | expr = (Expr *) var; |
681 | 2.36k | } |
682 | 3.10k | exprList = lappend(exprList, expr); |
683 | 3.10k | } |
684 | | |
685 | | /* Prepare row for assignment to target table */ |
686 | 1.16k | exprList = transformInsertRow(pstate, exprList, |
687 | 1.16k | stmt->cols, |
688 | 1.16k | icolumns, attrnos, |
689 | 1.16k | false); |
690 | 1.16k | } |
691 | 269k | else if (list_length(selectStmt->valuesLists) > 1) |
692 | 1.13k | { |
693 | | /* |
694 | | * Process INSERT ... VALUES with multiple VALUES sublists. We |
695 | | * generate a VALUES RTE holding the transformed expression lists, and |
696 | | * build up a targetlist containing Vars that reference the VALUES |
697 | | * RTE. |
698 | | */ |
699 | 1.13k | List *exprsLists = NIL; |
700 | 1.13k | List *coltypes = NIL; |
701 | 1.13k | List *coltypmods = NIL; |
702 | 1.13k | List *colcollations = NIL; |
703 | 1.13k | int sublist_length = -1; |
704 | 1.13k | bool lateral = false; |
705 | | |
706 | 1.13k | Assert(selectStmt->intoClause == NULL); |
707 | | |
708 | 1.13k | foreach(lc, selectStmt->valuesLists) |
709 | 110k | { |
710 | 110k | List *sublist = (List *) lfirst(lc); |
711 | | |
712 | | /* |
713 | | * Do basic expression transformation (same as a ROW() expr, but |
714 | | * allow SetToDefault at top level) |
715 | | */ |
716 | 110k | sublist = transformExpressionList(pstate, sublist, |
717 | 110k | EXPR_KIND_VALUES, true); |
718 | | |
719 | | /* |
720 | | * All the sublists must be the same length, *after* |
721 | | * transformation (which might expand '*' into multiple items). |
722 | | * The VALUES RTE can't handle anything different. |
723 | | */ |
724 | 110k | if (sublist_length < 0) |
725 | 1.13k | { |
726 | | /* Remember post-transformation length of first sublist */ |
727 | 1.13k | sublist_length = list_length(sublist); |
728 | 1.13k | } |
729 | 109k | else if (sublist_length != list_length(sublist)) |
730 | 0 | { |
731 | 0 | ereport(ERROR, |
732 | 0 | (errcode(ERRCODE_SYNTAX_ERROR), |
733 | 0 | errmsg("VALUES lists must all be the same length"), |
734 | 0 | parser_errposition(pstate, |
735 | 0 | exprLocation((Node *) sublist)))); |
736 | 0 | } |
737 | | |
738 | | /* |
739 | | * Prepare row for assignment to target table. We process any |
740 | | * indirection on the target column specs normally but then strip |
741 | | * off the resulting field/array assignment nodes, since we don't |
742 | | * want the parsed statement to contain copies of those in each |
743 | | * VALUES row. (It's annoying to have to transform the |
744 | | * indirection specs over and over like this, but avoiding it |
745 | | * would take some really messy refactoring of |
746 | | * transformAssignmentIndirection.) |
747 | | */ |
748 | 110k | sublist = transformInsertRow(pstate, sublist, |
749 | 110k | stmt->cols, |
750 | 110k | icolumns, attrnos, |
751 | 110k | true); |
752 | | |
753 | | /* |
754 | | * We must assign collations now because assign_query_collations |
755 | | * doesn't process rangetable entries. We just assign all the |
756 | | * collations independently in each row, and don't worry about |
757 | | * whether they are consistent vertically. The outer INSERT query |
758 | | * isn't going to care about the collations of the VALUES columns, |
759 | | * so it's not worth the effort to identify a common collation for |
760 | | * each one here. (But note this does have one user-visible |
761 | | * consequence: INSERT ... VALUES won't complain about conflicting |
762 | | * explicit COLLATEs in a column, whereas the same VALUES |
763 | | * construct in another context would complain.) |
764 | | */ |
765 | 110k | assign_list_collations(pstate, sublist); |
766 | | |
767 | 110k | exprsLists = lappend(exprsLists, sublist); |
768 | 110k | } |
769 | | |
770 | | /* |
771 | | * Construct column type/typmod/collation lists for the VALUES RTE. |
772 | | * Every expression in each column has been coerced to the type/typmod |
773 | | * of the corresponding target column or subfield, so it's sufficient |
774 | | * to look at the exprType/exprTypmod of the first row. We don't care |
775 | | * about the collation labeling, so just fill in InvalidOid for that. |
776 | | */ |
777 | 1.13k | foreach(lc, (List *) linitial(exprsLists)) |
778 | 4.64k | { |
779 | 4.64k | Node *val = (Node *) lfirst(lc); |
780 | | |
781 | 4.64k | coltypes = lappend_oid(coltypes, exprType(val)); |
782 | 4.64k | coltypmods = lappend_int(coltypmods, exprTypmod(val)); |
783 | 4.64k | colcollations = lappend_oid(colcollations, InvalidOid); |
784 | 4.64k | } |
785 | | |
786 | | /* |
787 | | * Ordinarily there can't be any current-level Vars in the expression |
788 | | * lists, because the namespace was empty ... but if we're inside |
789 | | * CREATE RULE, then NEW/OLD references might appear. In that case we |
790 | | * have to mark the VALUES RTE as LATERAL. |
791 | | */ |
792 | 1.13k | if (list_length(pstate->p_rtable) != 1 && |
793 | 1.13k | contain_vars_of_level((Node *) exprsLists, 0)1 ) |
794 | 1 | lateral = true; |
795 | | |
796 | | /* |
797 | | * Generate the VALUES RTE |
798 | | */ |
799 | 1.13k | rte = addRangeTableEntryForValues(pstate, exprsLists, |
800 | 1.13k | coltypes, coltypmods, colcollations, |
801 | 1.13k | NULL, lateral, true); |
802 | 1.13k | rtr = makeNode(RangeTblRef); |
803 | | /* assume new rte is at end */ |
804 | 0 | rtr->rtindex = list_length(pstate->p_rtable); |
805 | 1.13k | Assert(rte == rt_fetch(rtr->rtindex, pstate->p_rtable)); |
806 | 1.13k | pstate->p_joinlist = lappend(pstate->p_joinlist, rtr); |
807 | | |
808 | | /* |
809 | | * Generate list of Vars referencing the RTE |
810 | | */ |
811 | 1.13k | expandRTE(rte, rtr->rtindex, 0, -1, false, NULL, &exprList); |
812 | | |
813 | | /* |
814 | | * Re-apply any indirection on the target column specs to the Vars |
815 | | */ |
816 | 1.13k | exprList = transformInsertRow(pstate, exprList, |
817 | 1.13k | stmt->cols, |
818 | 1.13k | icolumns, attrnos, |
819 | 1.13k | false); |
820 | 1.13k | } |
821 | 268k | else |
822 | 268k | { |
823 | | /* |
824 | | * Process INSERT ... VALUES with a single VALUES sublist. We treat |
825 | | * this case separately for efficiency. The sublist is just computed |
826 | | * directly as the Query's targetlist, with no VALUES RTE. So it |
827 | | * works just like a SELECT without any FROM. |
828 | | */ |
829 | 268k | List *valuesLists = selectStmt->valuesLists; |
830 | | |
831 | 268k | Assert(list_length(valuesLists) == 1); |
832 | 268k | Assert(selectStmt->intoClause == NULL); |
833 | | |
834 | | /* |
835 | | * Do basic expression transformation (same as a ROW() expr, but allow |
836 | | * SetToDefault at top level) |
837 | | */ |
838 | 268k | exprList = transformExpressionList(pstate, |
839 | 268k | (List *) linitial(valuesLists), |
840 | 268k | EXPR_KIND_VALUES_SINGLE, |
841 | 268k | true); |
842 | | |
843 | | /* Prepare row for assignment to target table */ |
844 | 268k | exprList = transformInsertRow(pstate, exprList, |
845 | 268k | stmt->cols, |
846 | 268k | icolumns, attrnos, |
847 | 268k | false); |
848 | 268k | } |
849 | | |
850 | | /* |
851 | | * Generate query's target list using the computed list of expressions. |
852 | | * Also, mark all the target columns as needing insert permissions. |
853 | | */ |
854 | 271k | rte = pstate->p_target_rangetblentry; |
855 | 271k | qry->targetList = NIL; |
856 | 271k | icols = list_head(icolumns); |
857 | 271k | attnos = list_head(attrnos); |
858 | 271k | foreach(lc, exprList) |
859 | 693k | { |
860 | 693k | Expr *expr = (Expr *) lfirst(lc); |
861 | 693k | ResTarget *col; |
862 | 693k | AttrNumber attr_num; |
863 | 693k | TargetEntry *tle; |
864 | | |
865 | 693k | col = lfirst_node(ResTarget, icols); |
866 | 693k | attr_num = (AttrNumber) lfirst_int(attnos); |
867 | | |
868 | 693k | tle = makeTargetEntry(expr, |
869 | 693k | attr_num, |
870 | 693k | col->name, |
871 | 693k | false); |
872 | 693k | qry->targetList = lappend(qry->targetList, tle); |
873 | | |
874 | 693k | rte->insertedCols = bms_add_member(rte->insertedCols, |
875 | 693k | attr_num - YBGetFirstLowInvalidAttributeNumber(pstate->p_target_relation)); |
876 | | |
877 | 693k | icols = lnext(icols); |
878 | 693k | attnos = lnext(attnos); |
879 | 693k | } |
880 | | |
881 | | /* Process ON CONFLICT, if any. */ |
882 | 271k | if (stmt->onConflictClause) |
883 | 7.63k | qry->onConflict = transformOnConflictClause(pstate, |
884 | 7.63k | stmt->onConflictClause); |
885 | | |
886 | | /* |
887 | | * If we have a RETURNING clause, we need to add the target relation to |
888 | | * the query namespace before processing it, so that Var references in |
889 | | * RETURNING will work. Also, remove any namespace entries added in a |
890 | | * sub-SELECT or VALUES list. |
891 | | */ |
892 | 271k | if (stmt->returningList) |
893 | 205 | { |
894 | 205 | pstate->p_namespace = NIL; |
895 | 205 | addRTEtoQuery(pstate, pstate->p_target_rangetblentry, |
896 | 205 | false, true, true); |
897 | 205 | qry->returningList = transformReturningList(pstate, |
898 | 205 | stmt->returningList); |
899 | 205 | } |
900 | | |
901 | | /* done building the range table and jointree */ |
902 | 271k | qry->rtable = pstate->p_rtable; |
903 | 271k | qry->jointree = makeFromExpr(pstate->p_joinlist, NULL); |
904 | | |
905 | 271k | qry->hasTargetSRFs = pstate->p_hasTargetSRFs; |
906 | 271k | qry->hasSubLinks = pstate->p_hasSubLinks; |
907 | | |
908 | 271k | assign_query_collations(pstate, qry); |
909 | | |
910 | 271k | return qry; |
911 | 271k | } |
912 | | |
913 | | /* |
914 | | * Prepare an INSERT row for assignment to the target table. |
915 | | * |
916 | | * exprlist: transformed expressions for source values; these might come from |
917 | | * a VALUES row, or be Vars referencing a sub-SELECT or VALUES RTE output. |
918 | | * stmtcols: original target-columns spec for INSERT (we just test for NIL) |
919 | | * icolumns: effective target-columns spec (list of ResTarget) |
920 | | * attrnos: integer column numbers (must be same length as icolumns) |
921 | | * strip_indirection: if true, remove any field/array assignment nodes |
922 | | */ |
923 | | static List * |
924 | | transformInsertRow(ParseState *pstate, List *exprlist, |
925 | | List *stmtcols, List *icolumns, List *attrnos, |
926 | | bool strip_indirection) |
927 | 381k | { |
928 | 381k | List *result; |
929 | 381k | ListCell *lc; |
930 | 381k | ListCell *icols; |
931 | 381k | ListCell *attnos; |
932 | | |
933 | | /* |
934 | | * Check length of expr list. It must not have more expressions than |
935 | | * there are target columns. We allow fewer, but only if no explicit |
936 | | * columns list was given (the remaining columns are implicitly |
937 | | * defaulted). Note we must check this *after* transformation because |
938 | | * that could expand '*' into multiple items. |
939 | | */ |
940 | 381k | if (list_length(exprlist) > list_length(icolumns)) |
941 | 381k | ereport(ERROR, |
942 | 381k | (errcode(ERRCODE_SYNTAX_ERROR), |
943 | 381k | errmsg("INSERT has more expressions than target columns"), |
944 | 381k | parser_errposition(pstate, |
945 | 381k | exprLocation(list_nth(exprlist, |
946 | 381k | list_length(icolumns)))))); |
947 | 381k | if (stmtcols != NIL && |
948 | 381k | list_length(exprlist) < list_length(icolumns)196k ) |
949 | 2 | { |
950 | | /* |
951 | | * We can get here for cases like INSERT ... SELECT (a,b,c) FROM ... |
952 | | * where the user accidentally created a RowExpr instead of separate |
953 | | * columns. Add a suitable hint if that seems to be the problem, |
954 | | * because the main error message is quite misleading for this case. |
955 | | * (If there's no stmtcols, you'll get something about data type |
956 | | * mismatch, which is less misleading so we don't worry about giving a |
957 | | * hint in that case.) |
958 | | */ |
959 | 2 | ereport(ERROR, |
960 | 2 | (errcode(ERRCODE_SYNTAX_ERROR), |
961 | 2 | errmsg("INSERT has more target columns than expressions"), |
962 | 2 | ((list_length(exprlist) == 1 && |
963 | 2 | count_rowexpr_columns(pstate, linitial(exprlist)) == |
964 | 2 | list_length(icolumns)) ? |
965 | 2 | 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), |
966 | 2 | parser_errposition(pstate, |
967 | 2 | exprLocation(list_nth(icolumns, |
968 | 2 | list_length(exprlist)))))); |
969 | 2 | } |
970 | | |
971 | | /* |
972 | | * Prepare columns for assignment to target table. |
973 | | */ |
974 | 381k | result = NIL; |
975 | 381k | icols = list_head(icolumns); |
976 | 381k | attnos = list_head(attrnos); |
977 | 381k | foreach(lc, exprlist) |
978 | 1.11M | { |
979 | 1.11M | Expr *expr = (Expr *) lfirst(lc); |
980 | 1.11M | ResTarget *col; |
981 | | |
982 | 1.11M | col = lfirst_node(ResTarget, icols); |
983 | | |
984 | 1.11M | expr = transformAssignedExpr(pstate, expr, |
985 | 1.11M | EXPR_KIND_INSERT_TARGET, |
986 | 1.11M | col->name, |
987 | 1.11M | lfirst_int(attnos), |
988 | 1.11M | col->indirection, |
989 | 1.11M | col->location); |
990 | | |
991 | 1.11M | if (strip_indirection) |
992 | 420k | { |
993 | 420k | while (expr) |
994 | 420k | { |
995 | 420k | if (IsA(expr, FieldStore)) |
996 | 16 | { |
997 | 16 | FieldStore *fstore = (FieldStore *) expr; |
998 | | |
999 | 16 | expr = (Expr *) linitial(fstore->newvals); |
1000 | 16 | } |
1001 | 420k | else if (IsA(expr, ArrayRef)) |
1002 | 22 | { |
1003 | 22 | ArrayRef *aref = (ArrayRef *) expr; |
1004 | | |
1005 | 22 | if (aref->refassgnexpr == NULL) |
1006 | 0 | break; |
1007 | 22 | expr = aref->refassgnexpr; |
1008 | 22 | } |
1009 | 420k | else |
1010 | 420k | break; |
1011 | 420k | } |
1012 | 420k | } |
1013 | | |
1014 | 1.11M | result = lappend(result, expr); |
1015 | | |
1016 | 1.11M | icols = lnext(icols); |
1017 | 1.11M | attnos = lnext(attnos); |
1018 | 1.11M | } |
1019 | | |
1020 | 381k | return result; |
1021 | 381k | } |
1022 | | |
1023 | | /* |
1024 | | * transformOnConflictClause - |
1025 | | * transforms an OnConflictClause in an INSERT |
1026 | | */ |
1027 | | static OnConflictExpr * |
1028 | | transformOnConflictClause(ParseState *pstate, |
1029 | | OnConflictClause *onConflictClause) |
1030 | 7.62k | { |
1031 | 7.62k | List *arbiterElems; |
1032 | 7.62k | Node *arbiterWhere; |
1033 | 7.62k | Oid arbiterConstraint; |
1034 | 7.62k | List *onConflictSet = NIL; |
1035 | 7.62k | Node *onConflictWhere = NULL; |
1036 | 7.62k | RangeTblEntry *exclRte = NULL; |
1037 | 7.62k | int exclRelIndex = 0; |
1038 | 7.62k | List *exclRelTlist = NIL; |
1039 | 7.62k | OnConflictExpr *result; |
1040 | | |
1041 | | /* Process the arbiter clause, ON CONFLICT ON (...) */ |
1042 | 7.62k | transformOnConflictArbiter(pstate, onConflictClause, &arbiterElems, |
1043 | 7.62k | &arbiterWhere, &arbiterConstraint); |
1044 | | |
1045 | | /* Process DO UPDATE */ |
1046 | 7.62k | if (onConflictClause->action == ONCONFLICT_UPDATE) |
1047 | 7.36k | { |
1048 | 7.36k | Relation targetrel = pstate->p_target_relation; |
1049 | | |
1050 | | /* |
1051 | | * All INSERT expressions have been parsed, get ready for potentially |
1052 | | * existing SET statements that need to be processed like an UPDATE. |
1053 | | */ |
1054 | 7.36k | pstate->p_is_insert = false; |
1055 | | |
1056 | | /* |
1057 | | * Add range table entry for the EXCLUDED pseudo relation. relkind is |
1058 | | * set to composite to signal that we're not dealing with an actual |
1059 | | * relation, and no permission checks are required on it. (We'll |
1060 | | * check the actual target relation, instead.) |
1061 | | */ |
1062 | 7.36k | exclRte = addRangeTableEntryForRelation(pstate, |
1063 | 7.36k | targetrel, |
1064 | 7.36k | makeAlias("excluded", NIL), |
1065 | 7.36k | false, false); |
1066 | 7.36k | exclRte->relkind = RELKIND_COMPOSITE_TYPE; |
1067 | 7.36k | exclRte->requiredPerms = 0; |
1068 | | /* other permissions fields in exclRte are already empty */ |
1069 | | |
1070 | 7.36k | exclRelIndex = list_length(pstate->p_rtable); |
1071 | | |
1072 | | /* Create EXCLUDED rel's targetlist for use by EXPLAIN */ |
1073 | 7.36k | exclRelTlist = BuildOnConflictExcludedTargetlist(targetrel, |
1074 | 7.36k | exclRelIndex); |
1075 | | |
1076 | | /* |
1077 | | * Add EXCLUDED and the target RTE to the namespace, so that they can |
1078 | | * be used in the UPDATE subexpressions. |
1079 | | */ |
1080 | 7.36k | addRTEtoQuery(pstate, exclRte, false, true, true); |
1081 | 7.36k | addRTEtoQuery(pstate, pstate->p_target_rangetblentry, |
1082 | 7.36k | false, true, true); |
1083 | | |
1084 | | /* |
1085 | | * Now transform the UPDATE subexpressions. |
1086 | | */ |
1087 | 7.36k | onConflictSet = |
1088 | 7.36k | transformUpdateTargetList(pstate, onConflictClause->targetList); |
1089 | | |
1090 | 7.36k | onConflictWhere = transformWhereClause(pstate, |
1091 | 7.36k | onConflictClause->whereClause, |
1092 | 7.36k | EXPR_KIND_WHERE, "WHERE"); |
1093 | 7.36k | } |
1094 | | |
1095 | | /* Finally, build ON CONFLICT DO [NOTHING | UPDATE] expression */ |
1096 | 7.62k | result = makeNode(OnConflictExpr); |
1097 | | |
1098 | 0 | result->action = onConflictClause->action; |
1099 | 7.62k | result->arbiterElems = arbiterElems; |
1100 | 7.62k | result->arbiterWhere = arbiterWhere; |
1101 | 7.62k | result->constraint = arbiterConstraint; |
1102 | 7.62k | result->onConflictSet = onConflictSet; |
1103 | 7.62k | result->onConflictWhere = onConflictWhere; |
1104 | 7.62k | result->exclRelIndex = exclRelIndex; |
1105 | 7.62k | result->exclRelTlist = exclRelTlist; |
1106 | | |
1107 | 7.62k | return result; |
1108 | 7.62k | } |
1109 | | |
1110 | | |
1111 | | /* |
1112 | | * BuildOnConflictExcludedTargetlist |
1113 | | * Create target list for the EXCLUDED pseudo-relation of ON CONFLICT, |
1114 | | * representing the columns of targetrel with varno exclRelIndex. |
1115 | | * |
1116 | | * Note: Exported for use in the rewriter. |
1117 | | */ |
1118 | | List * |
1119 | | BuildOnConflictExcludedTargetlist(Relation targetrel, |
1120 | | Index exclRelIndex) |
1121 | 7.36k | { |
1122 | 7.36k | List *result = NIL; |
1123 | 7.36k | int attno; |
1124 | 7.36k | Var *var; |
1125 | 7.36k | TargetEntry *te; |
1126 | | |
1127 | | /* |
1128 | | * Note that resnos of the tlist must correspond to attnos of the |
1129 | | * underlying relation, hence we need entries for dropped columns too. |
1130 | | */ |
1131 | 22.2k | for (attno = 0; attno < RelationGetNumberOfAttributes(targetrel); attno++14.8k ) |
1132 | 14.8k | { |
1133 | 14.8k | Form_pg_attribute attr = TupleDescAttr(targetrel->rd_att, attno); |
1134 | 14.8k | char *name; |
1135 | | |
1136 | 14.8k | if (attr->attisdropped) |
1137 | 5 | { |
1138 | | /* |
1139 | | * can't use atttypid here, but it doesn't really matter what type |
1140 | | * the Const claims to be. |
1141 | | */ |
1142 | 5 | var = (Var *) makeNullConst(INT4OID, -1, InvalidOid); |
1143 | 5 | name = ""; |
1144 | 5 | } |
1145 | 14.8k | else |
1146 | 14.8k | { |
1147 | 14.8k | var = makeVar(exclRelIndex, attno + 1, |
1148 | 14.8k | attr->atttypid, attr->atttypmod, |
1149 | 14.8k | attr->attcollation, |
1150 | 14.8k | 0); |
1151 | 14.8k | name = pstrdup(NameStr(attr->attname)); |
1152 | 14.8k | } |
1153 | | |
1154 | 14.8k | te = makeTargetEntry((Expr *) var, |
1155 | 14.8k | attno + 1, |
1156 | 14.8k | name, |
1157 | 14.8k | false); |
1158 | | |
1159 | 14.8k | result = lappend(result, te); |
1160 | 14.8k | } |
1161 | | |
1162 | | /* |
1163 | | * Add a whole-row-Var entry to support references to "EXCLUDED.*". Like |
1164 | | * the other entries in the EXCLUDED tlist, its resno must match the Var's |
1165 | | * varattno, else the wrong things happen while resolving references in |
1166 | | * setrefs.c. This is against normal conventions for targetlists, but |
1167 | | * it's okay since we don't use this as a real tlist. |
1168 | | */ |
1169 | 7.36k | var = makeVar(exclRelIndex, InvalidAttrNumber, |
1170 | 7.36k | targetrel->rd_rel->reltype, |
1171 | 7.36k | -1, InvalidOid, 0); |
1172 | 7.36k | te = makeTargetEntry((Expr *) var, InvalidAttrNumber, NULL, true); |
1173 | 7.36k | result = lappend(result, te); |
1174 | | |
1175 | 7.36k | return result; |
1176 | 7.36k | } |
1177 | | |
1178 | | |
1179 | | /* |
1180 | | * count_rowexpr_columns - |
1181 | | * get number of columns contained in a ROW() expression; |
1182 | | * return -1 if expression isn't a RowExpr or a Var referencing one. |
1183 | | * |
1184 | | * This is currently used only for hint purposes, so we aren't terribly |
1185 | | * tense about recognizing all possible cases. The Var case is interesting |
1186 | | * because that's what we'll get in the INSERT ... SELECT (...) case. |
1187 | | */ |
1188 | | static int |
1189 | | count_rowexpr_columns(ParseState *pstate, Node *expr) |
1190 | 0 | { |
1191 | 0 | if (expr == NULL) |
1192 | 0 | return -1; |
1193 | 0 | if (IsA(expr, RowExpr)) |
1194 | 0 | return list_length(((RowExpr *) expr)->args); |
1195 | 0 | if (IsA(expr, Var)) |
1196 | 0 | { |
1197 | 0 | Var *var = (Var *) expr; |
1198 | 0 | AttrNumber attnum = var->varattno; |
1199 | |
|
1200 | 0 | if (attnum > 0 && var->vartype == RECORDOID) |
1201 | 0 | { |
1202 | 0 | RangeTblEntry *rte; |
1203 | |
|
1204 | 0 | rte = GetRTEByRangeTablePosn(pstate, var->varno, var->varlevelsup); |
1205 | 0 | if (rte->rtekind == RTE_SUBQUERY) |
1206 | 0 | { |
1207 | | /* Subselect-in-FROM: examine sub-select's output expr */ |
1208 | 0 | TargetEntry *ste = get_tle_by_resno(rte->subquery->targetList, |
1209 | 0 | attnum); |
1210 | |
|
1211 | 0 | if (ste == NULL || ste->resjunk) |
1212 | 0 | return -1; |
1213 | 0 | expr = (Node *) ste->expr; |
1214 | 0 | if (IsA(expr, RowExpr)) |
1215 | 0 | return list_length(((RowExpr *) expr)->args); |
1216 | 0 | } |
1217 | 0 | } |
1218 | 0 | } |
1219 | 0 | return -1; |
1220 | 0 | } |
1221 | | |
1222 | | |
1223 | | /* |
1224 | | * transformSelectStmt - |
1225 | | * transforms a Select Statement |
1226 | | * |
1227 | | * Note: this covers only cases with no set operations and no VALUES lists; |
1228 | | * see below for the other cases. |
1229 | | */ |
1230 | | static Query * |
1231 | | transformSelectStmt(ParseState *pstate, SelectStmt *stmt) |
1232 | 139k | { |
1233 | 139k | Query *qry = makeNode(Query); |
1234 | 0 | Node *qual; |
1235 | 139k | ListCell *l; |
1236 | | |
1237 | 139k | qry->commandType = CMD_SELECT; |
1238 | | |
1239 | | /* process the WITH clause independently of all else */ |
1240 | 139k | if (stmt->withClause) |
1241 | 2.20k | { |
1242 | 2.20k | qry->hasRecursive = stmt->withClause->recursive; |
1243 | 2.20k | qry->cteList = transformWithClause(pstate, stmt->withClause); |
1244 | 2.20k | qry->hasModifyingCTE = pstate->p_hasModifyingCTE; |
1245 | 2.20k | } |
1246 | | |
1247 | | /* Complain if we get called from someplace where INTO is not allowed */ |
1248 | 139k | if (stmt->intoClause) |
1249 | 139k | ereport(ERROR, |
1250 | 139k | (errcode(ERRCODE_SYNTAX_ERROR), |
1251 | 139k | errmsg("SELECT ... INTO is not allowed here"), |
1252 | 139k | parser_errposition(pstate, |
1253 | 139k | exprLocation((Node *) stmt->intoClause)))); |
1254 | | |
1255 | | /* make FOR UPDATE/FOR SHARE info available to addRangeTableEntry */ |
1256 | 139k | pstate->p_locking_clause = stmt->lockingClause; |
1257 | | |
1258 | | /* make WINDOW info available for window functions, too */ |
1259 | 139k | pstate->p_windowdefs = stmt->windowClause; |
1260 | | |
1261 | | /* process the FROM clause */ |
1262 | 139k | transformFromClause(pstate, stmt->fromClause); |
1263 | | |
1264 | | /* transform targetlist */ |
1265 | 139k | qry->targetList = transformTargetList(pstate, stmt->targetList, |
1266 | 139k | EXPR_KIND_SELECT_TARGET); |
1267 | | |
1268 | | /* mark column origins */ |
1269 | 139k | markTargetListOrigins(pstate, qry->targetList); |
1270 | | |
1271 | | /* transform WHERE */ |
1272 | 139k | qual = transformWhereClause(pstate, stmt->whereClause, |
1273 | 139k | EXPR_KIND_WHERE, "WHERE"); |
1274 | | |
1275 | | /* initial processing of HAVING clause is much like WHERE clause */ |
1276 | 139k | qry->havingQual = transformWhereClause(pstate, stmt->havingClause, |
1277 | 139k | EXPR_KIND_HAVING, "HAVING"); |
1278 | | |
1279 | | /* |
1280 | | * Transform sorting/grouping stuff. Do ORDER BY first because both |
1281 | | * transformGroupClause and transformDistinctClause need the results. Note |
1282 | | * that these functions can also change the targetList, so it's passed to |
1283 | | * them by reference. |
1284 | | */ |
1285 | 139k | qry->sortClause = transformSortClause(pstate, |
1286 | 139k | stmt->sortClause, |
1287 | 139k | &qry->targetList, |
1288 | 139k | EXPR_KIND_ORDER_BY, |
1289 | 139k | false /* allow SQL92 rules */ ); |
1290 | | |
1291 | 139k | qry->groupClause = transformGroupClause(pstate, |
1292 | 139k | stmt->groupClause, |
1293 | 139k | &qry->groupingSets, |
1294 | 139k | &qry->targetList, |
1295 | 139k | qry->sortClause, |
1296 | 139k | EXPR_KIND_GROUP_BY, |
1297 | 139k | false /* allow SQL92 rules */ ); |
1298 | | |
1299 | 139k | if (stmt->distinctClause == NIL) |
1300 | 139k | { |
1301 | 139k | qry->distinctClause = NIL; |
1302 | 139k | qry->hasDistinctOn = false; |
1303 | 139k | } |
1304 | 715 | else if (linitial(stmt->distinctClause) == NULL) |
1305 | 42 | { |
1306 | | /* We had SELECT DISTINCT */ |
1307 | 42 | qry->distinctClause = transformDistinctClause(pstate, |
1308 | 42 | &qry->targetList, |
1309 | 42 | qry->sortClause, |
1310 | 42 | false); |
1311 | 42 | qry->hasDistinctOn = false; |
1312 | 42 | } |
1313 | 673 | else |
1314 | 673 | { |
1315 | | /* We had SELECT DISTINCT ON */ |
1316 | 673 | qry->distinctClause = transformDistinctOnClause(pstate, |
1317 | 673 | stmt->distinctClause, |
1318 | 673 | &qry->targetList, |
1319 | 673 | qry->sortClause); |
1320 | 673 | qry->hasDistinctOn = true; |
1321 | 673 | } |
1322 | | |
1323 | | /* transform LIMIT */ |
1324 | 139k | qry->limitOffset = transformLimitClause(pstate, stmt->limitOffset, |
1325 | 139k | EXPR_KIND_OFFSET, "OFFSET"); |
1326 | 139k | qry->limitCount = transformLimitClause(pstate, stmt->limitCount, |
1327 | 139k | EXPR_KIND_LIMIT, "LIMIT"); |
1328 | | |
1329 | | /* transform window clauses after we have seen all window functions */ |
1330 | 139k | qry->windowClause = transformWindowDefinitions(pstate, |
1331 | 139k | pstate->p_windowdefs, |
1332 | 139k | &qry->targetList); |
1333 | | |
1334 | | /* resolve any still-unresolved output columns as being type text */ |
1335 | 139k | if (pstate->p_resolve_unknowns) |
1336 | 135k | resolveTargetListUnknowns(pstate, qry->targetList); |
1337 | | |
1338 | 139k | qry->rtable = pstate->p_rtable; |
1339 | 139k | qry->jointree = makeFromExpr(pstate->p_joinlist, qual); |
1340 | | |
1341 | 139k | qry->hasSubLinks = pstate->p_hasSubLinks; |
1342 | 139k | qry->hasWindowFuncs = pstate->p_hasWindowFuncs; |
1343 | 139k | qry->hasTargetSRFs = pstate->p_hasTargetSRFs; |
1344 | 139k | qry->hasAggs = pstate->p_hasAggs; |
1345 | | |
1346 | 139k | foreach(l, stmt->lockingClause) |
1347 | 4.63k | { |
1348 | 4.63k | transformLockingClause(pstate, qry, |
1349 | 4.63k | (LockingClause *) lfirst(l), false); |
1350 | 4.63k | } |
1351 | | |
1352 | 139k | assign_query_collations(pstate, qry); |
1353 | | |
1354 | | /* this must be done after collations, for reliable comparison of exprs */ |
1355 | 139k | if (pstate->p_hasAggs || qry->groupClause133k || qry->groupingSets133k || qry->havingQual133k ) |
1356 | 5.61k | parseCheckAggregates(pstate, qry); |
1357 | | |
1358 | 139k | return qry; |
1359 | 139k | } |
1360 | | |
1361 | | /* |
1362 | | * transformValuesClause - |
1363 | | * transforms a VALUES clause that's being used as a standalone SELECT |
1364 | | * |
1365 | | * We build a Query containing a VALUES RTE, rather as if one had written |
1366 | | * SELECT * FROM (VALUES ...) AS "*VALUES*" |
1367 | | */ |
1368 | | static Query * |
1369 | | transformValuesClause(ParseState *pstate, SelectStmt *stmt) |
1370 | 1.23k | { |
1371 | 1.23k | Query *qry = makeNode(Query); |
1372 | 0 | List *exprsLists; |
1373 | 1.23k | List *coltypes = NIL; |
1374 | 1.23k | List *coltypmods = NIL; |
1375 | 1.23k | List *colcollations = NIL; |
1376 | 1.23k | List **colexprs = NULL; |
1377 | 1.23k | int sublist_length = -1; |
1378 | 1.23k | bool lateral = false; |
1379 | 1.23k | RangeTblEntry *rte; |
1380 | 1.23k | int rtindex; |
1381 | 1.23k | ListCell *lc; |
1382 | 1.23k | ListCell *lc2; |
1383 | 1.23k | int i; |
1384 | | |
1385 | 1.23k | qry->commandType = CMD_SELECT; |
1386 | | |
1387 | | /* Most SELECT stuff doesn't apply in a VALUES clause */ |
1388 | 1.23k | Assert(stmt->distinctClause == NIL); |
1389 | 1.23k | Assert(stmt->intoClause == NULL); |
1390 | 1.23k | Assert(stmt->targetList == NIL); |
1391 | 1.23k | Assert(stmt->fromClause == NIL); |
1392 | 1.23k | Assert(stmt->whereClause == NULL); |
1393 | 1.23k | Assert(stmt->groupClause == NIL); |
1394 | 1.23k | Assert(stmt->havingClause == NULL); |
1395 | 1.23k | Assert(stmt->windowClause == NIL); |
1396 | 1.23k | Assert(stmt->op == SETOP_NONE); |
1397 | | |
1398 | | /* process the WITH clause independently of all else */ |
1399 | 1.23k | if (stmt->withClause) |
1400 | 4 | { |
1401 | 4 | qry->hasRecursive = stmt->withClause->recursive; |
1402 | 4 | qry->cteList = transformWithClause(pstate, stmt->withClause); |
1403 | 4 | qry->hasModifyingCTE = pstate->p_hasModifyingCTE; |
1404 | 4 | } |
1405 | | |
1406 | | /* |
1407 | | * For each row of VALUES, transform the raw expressions. |
1408 | | * |
1409 | | * Note that the intermediate representation we build is column-organized |
1410 | | * not row-organized. That simplifies the type and collation processing |
1411 | | * below. |
1412 | | */ |
1413 | 1.23k | foreach(lc, stmt->valuesLists) |
1414 | 12.8k | { |
1415 | 12.8k | List *sublist = (List *) lfirst(lc); |
1416 | | |
1417 | | /* |
1418 | | * Do basic expression transformation (same as a ROW() expr, but here |
1419 | | * we disallow SetToDefault) |
1420 | | */ |
1421 | 12.8k | sublist = transformExpressionList(pstate, sublist, |
1422 | 12.8k | EXPR_KIND_VALUES, false); |
1423 | | |
1424 | | /* |
1425 | | * All the sublists must be the same length, *after* transformation |
1426 | | * (which might expand '*' into multiple items). The VALUES RTE can't |
1427 | | * handle anything different. |
1428 | | */ |
1429 | 12.8k | if (sublist_length < 0) |
1430 | 1.23k | { |
1431 | | /* Remember post-transformation length of first sublist */ |
1432 | 1.23k | sublist_length = list_length(sublist); |
1433 | | /* and allocate array for per-column lists */ |
1434 | 1.23k | colexprs = (List **) palloc0(sublist_length * sizeof(List *)); |
1435 | 1.23k | } |
1436 | 11.6k | else if (sublist_length != list_length(sublist)) |
1437 | 0 | { |
1438 | 0 | ereport(ERROR, |
1439 | 0 | (errcode(ERRCODE_SYNTAX_ERROR), |
1440 | 0 | errmsg("VALUES lists must all be the same length"), |
1441 | 0 | parser_errposition(pstate, |
1442 | 0 | exprLocation((Node *) sublist)))); |
1443 | 0 | } |
1444 | | |
1445 | | /* Build per-column expression lists */ |
1446 | 12.8k | i = 0; |
1447 | 12.8k | foreach(lc2, sublist) |
1448 | 23.7k | { |
1449 | 23.7k | Node *col = (Node *) lfirst(lc2); |
1450 | | |
1451 | 23.7k | colexprs[i] = lappend(colexprs[i], col); |
1452 | 23.7k | i++; |
1453 | 23.7k | } |
1454 | | |
1455 | | /* Release sub-list's cells to save memory */ |
1456 | 12.8k | list_free(sublist); |
1457 | 12.8k | } |
1458 | | |
1459 | | /* |
1460 | | * Now resolve the common types of the columns, and coerce everything to |
1461 | | * those types. Then identify the common typmod and common collation, if |
1462 | | * any, of each column. |
1463 | | * |
1464 | | * We must do collation processing now because (1) assign_query_collations |
1465 | | * doesn't process rangetable entries, and (2) we need to label the VALUES |
1466 | | * RTE with column collations for use in the outer query. We don't |
1467 | | * consider conflict of implicit collations to be an error here; instead |
1468 | | * the column will just show InvalidOid as its collation, and you'll get a |
1469 | | * failure later if that results in failure to resolve a collation. |
1470 | | * |
1471 | | * Note we modify the per-column expression lists in-place. |
1472 | | */ |
1473 | 2.66k | for (i = 0; 1.23k i < sublist_length; i++1.43k ) |
1474 | 1.43k | { |
1475 | 1.43k | Oid coltype; |
1476 | 1.43k | int32 coltypmod = -1; |
1477 | 1.43k | Oid colcoll; |
1478 | 1.43k | bool first = true; |
1479 | | |
1480 | 1.43k | coltype = select_common_type(pstate, colexprs[i], "VALUES", NULL); |
1481 | | |
1482 | 1.43k | foreach(lc, colexprs[i]) |
1483 | 23.7k | { |
1484 | 23.7k | Node *col = (Node *) lfirst(lc); |
1485 | | |
1486 | 23.7k | col = coerce_to_common_type(pstate, col, coltype, "VALUES"); |
1487 | 23.7k | lfirst(lc) = (void *) col; |
1488 | 23.7k | if (first) |
1489 | 1.43k | { |
1490 | 1.43k | coltypmod = exprTypmod(col); |
1491 | 1.43k | first = false; |
1492 | 1.43k | } |
1493 | 22.3k | else |
1494 | 22.3k | { |
1495 | | /* As soon as we see a non-matching typmod, fall back to -1 */ |
1496 | 22.3k | if (coltypmod >= 0 && coltypmod != exprTypmod(col)0 ) |
1497 | 0 | coltypmod = -1; |
1498 | 22.3k | } |
1499 | 23.7k | } |
1500 | | |
1501 | 1.43k | colcoll = select_common_collation(pstate, colexprs[i], true); |
1502 | | |
1503 | 1.43k | coltypes = lappend_oid(coltypes, coltype); |
1504 | 1.43k | coltypmods = lappend_int(coltypmods, coltypmod); |
1505 | 1.43k | colcollations = lappend_oid(colcollations, colcoll); |
1506 | 1.43k | } |
1507 | | |
1508 | | /* |
1509 | | * Finally, rearrange the coerced expressions into row-organized lists. |
1510 | | */ |
1511 | 1.23k | exprsLists = NIL; |
1512 | 1.23k | foreach(lc, colexprs[0]) |
1513 | 12.8k | { |
1514 | 12.8k | Node *col = (Node *) lfirst(lc); |
1515 | 12.8k | List *sublist; |
1516 | | |
1517 | 12.8k | sublist = list_make1(col); |
1518 | 12.8k | exprsLists = lappend(exprsLists, sublist); |
1519 | 12.8k | } |
1520 | 1.23k | list_free(colexprs[0]); |
1521 | 1.43k | for (i = 1; i < sublist_length; i++192 ) |
1522 | 192 | { |
1523 | 192 | forboth(lc, colexprs[i], lc2, exprsLists) |
1524 | 10.8k | { |
1525 | 10.8k | Node *col = (Node *) lfirst(lc); |
1526 | 10.8k | List *sublist = lfirst(lc2); |
1527 | | |
1528 | | /* sublist pointer in exprsLists won't need adjustment */ |
1529 | 10.8k | (void) lappend(sublist, col); |
1530 | 10.8k | } |
1531 | 192 | list_free(colexprs[i]); |
1532 | 192 | } |
1533 | | |
1534 | | /* |
1535 | | * Ordinarily there can't be any current-level Vars in the expression |
1536 | | * lists, because the namespace was empty ... but if we're inside CREATE |
1537 | | * RULE, then NEW/OLD references might appear. In that case we have to |
1538 | | * mark the VALUES RTE as LATERAL. |
1539 | | */ |
1540 | 1.23k | if (pstate->p_rtable != NIL && |
1541 | 1.23k | contain_vars_of_level((Node *) exprsLists, 0)0 ) |
1542 | 0 | lateral = true; |
1543 | | |
1544 | | /* |
1545 | | * Generate the VALUES RTE |
1546 | | */ |
1547 | 1.23k | rte = addRangeTableEntryForValues(pstate, exprsLists, |
1548 | 1.23k | coltypes, coltypmods, colcollations, |
1549 | 1.23k | NULL, lateral, true); |
1550 | 1.23k | addRTEtoQuery(pstate, rte, true, true, true); |
1551 | | |
1552 | | /* assume new rte is at end */ |
1553 | 1.23k | rtindex = list_length(pstate->p_rtable); |
1554 | 1.23k | Assert(rte == rt_fetch(rtindex, pstate->p_rtable)); |
1555 | | |
1556 | | /* |
1557 | | * Generate a targetlist as though expanding "*" |
1558 | | */ |
1559 | 1.23k | Assert(pstate->p_next_resno == 1); |
1560 | 1.23k | qry->targetList = expandRelAttrs(pstate, rte, rtindex, 0, -1); |
1561 | | |
1562 | | /* |
1563 | | * The grammar allows attaching ORDER BY, LIMIT, and FOR UPDATE to a |
1564 | | * VALUES, so cope. |
1565 | | */ |
1566 | 1.23k | qry->sortClause = transformSortClause(pstate, |
1567 | 1.23k | stmt->sortClause, |
1568 | 1.23k | &qry->targetList, |
1569 | 1.23k | EXPR_KIND_ORDER_BY, |
1570 | 1.23k | false /* allow SQL92 rules */ ); |
1571 | | |
1572 | 1.23k | qry->limitOffset = transformLimitClause(pstate, stmt->limitOffset, |
1573 | 1.23k | EXPR_KIND_OFFSET, "OFFSET"); |
1574 | 1.23k | qry->limitCount = transformLimitClause(pstate, stmt->limitCount, |
1575 | 1.23k | EXPR_KIND_LIMIT, "LIMIT"); |
1576 | | |
1577 | 1.23k | if (stmt->lockingClause) |
1578 | 1.23k | ereport(ERROR, |
1579 | 1.23k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
1580 | | /*------ |
1581 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
1582 | 1.23k | errmsg("%s cannot be applied to VALUES", |
1583 | 1.23k | LCS_asString(((LockingClause *) |
1584 | 1.23k | linitial(stmt->lockingClause))->strength)))); |
1585 | | |
1586 | 1.23k | qry->rtable = pstate->p_rtable; |
1587 | 1.23k | qry->jointree = makeFromExpr(pstate->p_joinlist, NULL); |
1588 | | |
1589 | 1.23k | qry->hasSubLinks = pstate->p_hasSubLinks; |
1590 | | |
1591 | 1.23k | assign_query_collations(pstate, qry); |
1592 | | |
1593 | 1.23k | return qry; |
1594 | 1.23k | } |
1595 | | |
1596 | | /* |
1597 | | * transformSetOperationStmt - |
1598 | | * transforms a set-operations tree |
1599 | | * |
1600 | | * A set-operation tree is just a SELECT, but with UNION/INTERSECT/EXCEPT |
1601 | | * structure to it. We must transform each leaf SELECT and build up a top- |
1602 | | * level Query that contains the leaf SELECTs as subqueries in its rangetable. |
1603 | | * The tree of set operations is converted into the setOperations field of |
1604 | | * the top-level Query. |
1605 | | */ |
1606 | | static Query * |
1607 | | transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt) |
1608 | 472 | { |
1609 | 472 | Query *qry = makeNode(Query); |
1610 | 0 | SelectStmt *leftmostSelect; |
1611 | 472 | int leftmostRTI; |
1612 | 472 | Query *leftmostQuery; |
1613 | 472 | SetOperationStmt *sostmt; |
1614 | 472 | List *sortClause; |
1615 | 472 | Node *limitOffset; |
1616 | 472 | Node *limitCount; |
1617 | 472 | List *lockingClause; |
1618 | 472 | WithClause *withClause; |
1619 | 472 | Node *node; |
1620 | 472 | ListCell *left_tlist, |
1621 | 472 | *lct, |
1622 | 472 | *lcm, |
1623 | 472 | *lcc, |
1624 | 472 | *l; |
1625 | 472 | List *targetvars, |
1626 | 472 | *targetnames, |
1627 | 472 | *sv_namespace; |
1628 | 472 | int sv_rtable_length; |
1629 | 472 | RangeTblEntry *jrte; |
1630 | 472 | int tllen; |
1631 | | |
1632 | 472 | qry->commandType = CMD_SELECT; |
1633 | | |
1634 | | /* |
1635 | | * Find leftmost leaf SelectStmt. We currently only need to do this in |
1636 | | * order to deliver a suitable error message if there's an INTO clause |
1637 | | * there, implying the set-op tree is in a context that doesn't allow |
1638 | | * INTO. (transformSetOperationTree would throw error anyway, but it |
1639 | | * seems worth the trouble to throw a different error for non-leftmost |
1640 | | * INTO, so we produce that error in transformSetOperationTree.) |
1641 | | */ |
1642 | 472 | leftmostSelect = stmt->larg; |
1643 | 2.09k | while (leftmostSelect && leftmostSelect->op != SETOP_NONE) |
1644 | 1.62k | leftmostSelect = leftmostSelect->larg; |
1645 | 472 | Assert(leftmostSelect && IsA(leftmostSelect, SelectStmt) && |
1646 | 472 | leftmostSelect->larg == NULL); |
1647 | 472 | if (leftmostSelect->intoClause) |
1648 | 472 | ereport(ERROR, |
1649 | 472 | (errcode(ERRCODE_SYNTAX_ERROR), |
1650 | 472 | errmsg("SELECT ... INTO is not allowed here"), |
1651 | 472 | parser_errposition(pstate, |
1652 | 472 | exprLocation((Node *) leftmostSelect->intoClause)))); |
1653 | | |
1654 | | /* |
1655 | | * We need to extract ORDER BY and other top-level clauses here and not |
1656 | | * let transformSetOperationTree() see them --- else it'll just recurse |
1657 | | * right back here! |
1658 | | */ |
1659 | 472 | sortClause = stmt->sortClause; |
1660 | 472 | limitOffset = stmt->limitOffset; |
1661 | 472 | limitCount = stmt->limitCount; |
1662 | 472 | lockingClause = stmt->lockingClause; |
1663 | 472 | withClause = stmt->withClause; |
1664 | | |
1665 | 472 | stmt->sortClause = NIL; |
1666 | 472 | stmt->limitOffset = NULL; |
1667 | 472 | stmt->limitCount = NULL; |
1668 | 472 | stmt->lockingClause = NIL; |
1669 | 472 | stmt->withClause = NULL; |
1670 | | |
1671 | | /* We don't support FOR UPDATE/SHARE with set ops at the moment. */ |
1672 | 472 | if (lockingClause) |
1673 | 472 | ereport(ERROR, |
1674 | 472 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
1675 | | /*------ |
1676 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
1677 | 472 | errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT", |
1678 | 472 | LCS_asString(((LockingClause *) |
1679 | 472 | linitial(lockingClause))->strength)))); |
1680 | | |
1681 | | /* Process the WITH clause independently of all else */ |
1682 | 472 | if (withClause) |
1683 | 8 | { |
1684 | 8 | qry->hasRecursive = withClause->recursive; |
1685 | 8 | qry->cteList = transformWithClause(pstate, withClause); |
1686 | 8 | qry->hasModifyingCTE = pstate->p_hasModifyingCTE; |
1687 | 8 | } |
1688 | | |
1689 | | /* |
1690 | | * Recursively transform the components of the tree. |
1691 | | */ |
1692 | 472 | sostmt = castNode(SetOperationStmt, |
1693 | 472 | transformSetOperationTree(pstate, stmt, true, NULL)); |
1694 | 472 | Assert(sostmt); |
1695 | 472 | qry->setOperations = (Node *) sostmt; |
1696 | | |
1697 | | /* |
1698 | | * Re-find leftmost SELECT (now it's a sub-query in rangetable) |
1699 | | */ |
1700 | 472 | node = sostmt->larg; |
1701 | 2.09k | while (node && IsA2.08k (node, SetOperationStmt)) |
1702 | 1.62k | node = ((SetOperationStmt *) node)->larg; |
1703 | 472 | Assert(node && IsA(node, RangeTblRef)); |
1704 | 472 | leftmostRTI = ((RangeTblRef *) node)->rtindex; |
1705 | 472 | leftmostQuery = rt_fetch(leftmostRTI, pstate->p_rtable)->subquery; |
1706 | 472 | Assert(leftmostQuery != NULL); |
1707 | | |
1708 | | /* |
1709 | | * Generate dummy targetlist for outer query using column names of |
1710 | | * leftmost select and common datatypes/collations of topmost set |
1711 | | * operation. Also make lists of the dummy vars and their names for use |
1712 | | * in parsing ORDER BY. |
1713 | | * |
1714 | | * Note: we use leftmostRTI as the varno of the dummy variables. It |
1715 | | * shouldn't matter too much which RT index they have, as long as they |
1716 | | * have one that corresponds to a real RT entry; else funny things may |
1717 | | * happen when the tree is mashed by rule rewriting. |
1718 | | */ |
1719 | 472 | qry->targetList = NIL; |
1720 | 472 | targetvars = NIL; |
1721 | 472 | targetnames = NIL; |
1722 | 472 | left_tlist = list_head(leftmostQuery->targetList); |
1723 | | |
1724 | 472 | forthree(lct, sostmt->colTypes, |
1725 | 472 | lcm, sostmt->colTypmods, |
1726 | 472 | lcc, sostmt->colCollations) |
1727 | 893 | { |
1728 | 893 | Oid colType = lfirst_oid(lct); |
1729 | 893 | int32 colTypmod = lfirst_int(lcm); |
1730 | 893 | Oid colCollation = lfirst_oid(lcc); |
1731 | 893 | TargetEntry *lefttle = (TargetEntry *) lfirst(left_tlist); |
1732 | 893 | char *colName; |
1733 | 893 | TargetEntry *tle; |
1734 | 893 | Var *var; |
1735 | | |
1736 | 893 | Assert(!lefttle->resjunk); |
1737 | 893 | colName = pstrdup(lefttle->resname); |
1738 | 893 | var = makeVar(leftmostRTI, |
1739 | 893 | lefttle->resno, |
1740 | 893 | colType, |
1741 | 893 | colTypmod, |
1742 | 893 | colCollation, |
1743 | 893 | 0); |
1744 | 893 | var->location = exprLocation((Node *) lefttle->expr); |
1745 | 893 | tle = makeTargetEntry((Expr *) var, |
1746 | 893 | (AttrNumber) pstate->p_next_resno++, |
1747 | 893 | colName, |
1748 | 893 | false); |
1749 | 893 | qry->targetList = lappend(qry->targetList, tle); |
1750 | 893 | targetvars = lappend(targetvars, var); |
1751 | 893 | targetnames = lappend(targetnames, makeString(colName)); |
1752 | 893 | left_tlist = lnext(left_tlist); |
1753 | 893 | } |
1754 | | |
1755 | | /* |
1756 | | * As a first step towards supporting sort clauses that are expressions |
1757 | | * using the output columns, generate a namespace entry that makes the |
1758 | | * output columns visible. A Join RTE node is handy for this, since we |
1759 | | * can easily control the Vars generated upon matches. |
1760 | | * |
1761 | | * Note: we don't yet do anything useful with such cases, but at least |
1762 | | * "ORDER BY upper(foo)" will draw the right error message rather than |
1763 | | * "foo not found". |
1764 | | */ |
1765 | 472 | sv_rtable_length = list_length(pstate->p_rtable); |
1766 | | |
1767 | 472 | jrte = addRangeTableEntryForJoin(pstate, |
1768 | 472 | targetnames, |
1769 | 472 | JOIN_INNER, |
1770 | 472 | targetvars, |
1771 | 472 | NULL, |
1772 | 472 | false); |
1773 | | |
1774 | 472 | sv_namespace = pstate->p_namespace; |
1775 | 472 | pstate->p_namespace = NIL; |
1776 | | |
1777 | | /* add jrte to column namespace only */ |
1778 | 472 | addRTEtoQuery(pstate, jrte, false, false, true); |
1779 | | |
1780 | | /* |
1781 | | * For now, we don't support resjunk sort clauses on the output of a |
1782 | | * setOperation tree --- you can only use the SQL92-spec options of |
1783 | | * selecting an output column by name or number. Enforce by checking that |
1784 | | * transformSortClause doesn't add any items to tlist. |
1785 | | */ |
1786 | 472 | tllen = list_length(qry->targetList); |
1787 | | |
1788 | 472 | qry->sortClause = transformSortClause(pstate, |
1789 | 472 | sortClause, |
1790 | 472 | &qry->targetList, |
1791 | 472 | EXPR_KIND_ORDER_BY, |
1792 | 472 | false /* allow SQL92 rules */ ); |
1793 | | |
1794 | | /* restore namespace, remove jrte from rtable */ |
1795 | 472 | pstate->p_namespace = sv_namespace; |
1796 | 472 | pstate->p_rtable = list_truncate(pstate->p_rtable, sv_rtable_length); |
1797 | | |
1798 | 472 | if (tllen != list_length(qry->targetList)) |
1799 | 472 | ereport(ERROR, |
1800 | 472 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
1801 | 472 | errmsg("invalid UNION/INTERSECT/EXCEPT ORDER BY clause"), |
1802 | 472 | errdetail("Only result column names can be used, not expressions or functions."), |
1803 | 472 | errhint("Add the expression/function to every SELECT, or move the UNION into a FROM clause."), |
1804 | 472 | parser_errposition(pstate, |
1805 | 472 | exprLocation(list_nth(qry->targetList, tllen))))); |
1806 | | |
1807 | 472 | qry->limitOffset = transformLimitClause(pstate, limitOffset, |
1808 | 472 | EXPR_KIND_OFFSET, "OFFSET"); |
1809 | 472 | qry->limitCount = transformLimitClause(pstate, limitCount, |
1810 | 472 | EXPR_KIND_LIMIT, "LIMIT"); |
1811 | | |
1812 | 472 | qry->rtable = pstate->p_rtable; |
1813 | 472 | qry->jointree = makeFromExpr(pstate->p_joinlist, NULL); |
1814 | | |
1815 | 472 | qry->hasSubLinks = pstate->p_hasSubLinks; |
1816 | 472 | qry->hasWindowFuncs = pstate->p_hasWindowFuncs; |
1817 | 472 | qry->hasTargetSRFs = pstate->p_hasTargetSRFs; |
1818 | 472 | qry->hasAggs = pstate->p_hasAggs; |
1819 | | |
1820 | 472 | foreach(l, lockingClause) |
1821 | 0 | { |
1822 | 0 | transformLockingClause(pstate, qry, |
1823 | 0 | (LockingClause *) lfirst(l), false); |
1824 | 0 | } |
1825 | | |
1826 | 472 | assign_query_collations(pstate, qry); |
1827 | | |
1828 | | /* this must be done after collations, for reliable comparison of exprs */ |
1829 | 472 | if (pstate->p_hasAggs || qry->groupClause459 || qry->groupingSets459 || qry->havingQual459 ) |
1830 | 0 | parseCheckAggregates(pstate, qry); |
1831 | | |
1832 | 472 | return qry; |
1833 | 472 | } |
1834 | | |
1835 | | /* |
1836 | | * transformSetOperationTree |
1837 | | * Recursively transform leaves and internal nodes of a set-op tree |
1838 | | * |
1839 | | * In addition to returning the transformed node, if targetlist isn't NULL |
1840 | | * then we return a list of its non-resjunk TargetEntry nodes. For a leaf |
1841 | | * set-op node these are the actual targetlist entries; otherwise they are |
1842 | | * dummy entries created to carry the type, typmod, collation, and location |
1843 | | * (for error messages) of each output column of the set-op node. This info |
1844 | | * is needed only during the internal recursion of this function, so outside |
1845 | | * callers pass NULL for targetlist. Note: the reason for passing the |
1846 | | * actual targetlist entries of a leaf node is so that upper levels can |
1847 | | * replace UNKNOWN Consts with properly-coerced constants. |
1848 | | */ |
1849 | | static Node * |
1850 | | transformSetOperationTree(ParseState *pstate, SelectStmt *stmt, |
1851 | | bool isTopLevel, List **targetlist) |
1852 | 4.65k | { |
1853 | 4.65k | bool isLeaf; |
1854 | | |
1855 | 4.65k | Assert(stmt && IsA(stmt, SelectStmt)); |
1856 | | |
1857 | | /* Guard against stack overflow due to overly complex set-expressions */ |
1858 | 4.65k | check_stack_depth(); |
1859 | | |
1860 | | /* |
1861 | | * Validity-check both leaf and internal SELECTs for disallowed ops. |
1862 | | */ |
1863 | 4.65k | if (stmt->intoClause) |
1864 | 4.65k | ereport(ERROR, |
1865 | 4.65k | (errcode(ERRCODE_SYNTAX_ERROR), |
1866 | 4.65k | errmsg("INTO is only allowed on first SELECT of UNION/INTERSECT/EXCEPT"), |
1867 | 4.65k | parser_errposition(pstate, |
1868 | 4.65k | exprLocation((Node *) stmt->intoClause)))); |
1869 | | |
1870 | | /* We don't support FOR UPDATE/SHARE with set ops at the moment. */ |
1871 | 4.65k | if (stmt->lockingClause) |
1872 | 4.65k | ereport(ERROR, |
1873 | 4.65k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
1874 | | /*------ |
1875 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
1876 | 4.65k | errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT", |
1877 | 4.65k | LCS_asString(((LockingClause *) |
1878 | 4.65k | linitial(stmt->lockingClause))->strength)))); |
1879 | | |
1880 | | /* |
1881 | | * If an internal node of a set-op tree has ORDER BY, LIMIT, FOR UPDATE, |
1882 | | * or WITH clauses attached, we need to treat it like a leaf node to |
1883 | | * generate an independent sub-Query tree. Otherwise, it can be |
1884 | | * represented by a SetOperationStmt node underneath the parent Query. |
1885 | | */ |
1886 | 4.65k | if (stmt->op == SETOP_NONE) |
1887 | 2.55k | { |
1888 | 2.55k | Assert(stmt->larg == NULL && stmt->rarg == NULL); |
1889 | 2.55k | isLeaf = true; |
1890 | 2.55k | } |
1891 | 2.10k | else |
1892 | 2.10k | { |
1893 | 2.10k | Assert(stmt->larg != NULL && stmt->rarg != NULL); |
1894 | 2.10k | if (stmt->sortClause || stmt->limitOffset || stmt->limitCount || |
1895 | 2.10k | stmt->lockingClause || stmt->withClause) |
1896 | 5 | isLeaf = true; |
1897 | 2.09k | else |
1898 | 2.09k | isLeaf = false; |
1899 | 2.10k | } |
1900 | | |
1901 | 4.65k | if (isLeaf) |
1902 | 2.56k | { |
1903 | | /* Process leaf SELECT */ |
1904 | 2.56k | Query *selectQuery; |
1905 | 2.56k | char selectName[32]; |
1906 | 2.56k | RangeTblEntry *rte PG_USED_FOR_ASSERTS_ONLY; |
1907 | 2.56k | RangeTblRef *rtr; |
1908 | 2.56k | ListCell *tl; |
1909 | | |
1910 | | /* |
1911 | | * Transform SelectStmt into a Query. |
1912 | | * |
1913 | | * This works the same as SELECT transformation normally would, except |
1914 | | * that we prevent resolving unknown-type outputs as TEXT. This does |
1915 | | * not change the subquery's semantics since if the column type |
1916 | | * matters semantically, it would have been resolved to something else |
1917 | | * anyway. Doing this lets us resolve such outputs using |
1918 | | * select_common_type(), below. |
1919 | | * |
1920 | | * Note: previously transformed sub-queries don't affect the parsing |
1921 | | * of this sub-query, because they are not in the toplevel pstate's |
1922 | | * namespace list. |
1923 | | */ |
1924 | 2.56k | selectQuery = parse_sub_analyze((Node *) stmt, pstate, |
1925 | 2.56k | NULL, false, false); |
1926 | | |
1927 | | /* |
1928 | | * Check for bogus references to Vars on the current query level (but |
1929 | | * upper-level references are okay). Normally this can't happen |
1930 | | * because the namespace will be empty, but it could happen if we are |
1931 | | * inside a rule. |
1932 | | */ |
1933 | 2.56k | if (pstate->p_namespace) |
1934 | 0 | { |
1935 | 0 | if (contain_vars_of_level((Node *) selectQuery, 1)) |
1936 | 0 | ereport(ERROR, |
1937 | 0 | (errcode(ERRCODE_INVALID_COLUMN_REFERENCE), |
1938 | 0 | errmsg("UNION/INTERSECT/EXCEPT member statement cannot refer to other relations of same query level"), |
1939 | 0 | parser_errposition(pstate, |
1940 | 0 | locate_var_of_level((Node *) selectQuery, 1)))); |
1941 | 0 | } |
1942 | | |
1943 | | /* |
1944 | | * Extract a list of the non-junk TLEs for upper-level processing. |
1945 | | */ |
1946 | 2.56k | if (targetlist) |
1947 | 2.55k | { |
1948 | 2.55k | *targetlist = NIL; |
1949 | 2.55k | foreach(tl, selectQuery->targetList) |
1950 | 5.32k | { |
1951 | 5.32k | TargetEntry *tle = (TargetEntry *) lfirst(tl); |
1952 | | |
1953 | 5.32k | if (!tle->resjunk) |
1954 | 5.32k | *targetlist = lappend(*targetlist, tle); |
1955 | 5.32k | } |
1956 | 2.55k | } |
1957 | | |
1958 | | /* |
1959 | | * Make the leaf query be a subquery in the top-level rangetable. |
1960 | | */ |
1961 | 2.56k | snprintf(selectName, sizeof(selectName), "*SELECT* %d", |
1962 | 2.56k | list_length(pstate->p_rtable) + 1); |
1963 | 2.56k | rte = addRangeTableEntryForSubquery(pstate, |
1964 | 2.56k | selectQuery, |
1965 | 2.56k | makeAlias(selectName, NIL), |
1966 | 2.56k | false, |
1967 | 2.56k | false); |
1968 | | |
1969 | | /* |
1970 | | * Return a RangeTblRef to replace the SelectStmt in the set-op tree. |
1971 | | */ |
1972 | 2.56k | rtr = makeNode(RangeTblRef); |
1973 | | /* assume new rte is at end */ |
1974 | 0 | rtr->rtindex = list_length(pstate->p_rtable); |
1975 | 2.56k | Assert(rte == rt_fetch(rtr->rtindex, pstate->p_rtable)); |
1976 | 2.56k | return (Node *) rtr; |
1977 | 2.56k | } |
1978 | 2.09k | else |
1979 | 2.09k | { |
1980 | | /* Process an internal node (set operation node) */ |
1981 | 2.09k | SetOperationStmt *op = makeNode(SetOperationStmt); |
1982 | 0 | List *ltargetlist; |
1983 | 2.09k | List *rtargetlist; |
1984 | 2.09k | ListCell *ltl; |
1985 | 2.09k | ListCell *rtl; |
1986 | 2.09k | const char *context; |
1987 | | |
1988 | 2.09k | context = (stmt->op == SETOP_UNION ? "UNION"2.07k : |
1989 | 2.09k | (25 stmt->op == SETOP_INTERSECT25 ? "INTERSECT"7 : |
1990 | 25 | "EXCEPT"18 )); |
1991 | | |
1992 | 2.09k | op->op = stmt->op; |
1993 | 2.09k | op->all = stmt->all; |
1994 | | |
1995 | | /* |
1996 | | * Recursively transform the left child node. |
1997 | | */ |
1998 | 2.09k | op->larg = transformSetOperationTree(pstate, stmt->larg, |
1999 | 2.09k | false, |
2000 | 2.09k | <argetlist); |
2001 | | |
2002 | | /* |
2003 | | * If we are processing a recursive union query, now is the time to |
2004 | | * examine the non-recursive term's output columns and mark the |
2005 | | * containing CTE as having those result columns. We should do this |
2006 | | * only at the topmost setop of the CTE, of course. |
2007 | | */ |
2008 | 2.09k | if (isTopLevel && |
2009 | 2.09k | pstate->p_parent_cte469 && |
2010 | 2.09k | pstate->p_parent_cte->cterecursive60 ) |
2011 | 51 | determineRecursiveColTypes(pstate, op->larg, ltargetlist); |
2012 | | |
2013 | | /* |
2014 | | * Recursively transform the right child node. |
2015 | | */ |
2016 | 2.09k | op->rarg = transformSetOperationTree(pstate, stmt->rarg, |
2017 | 2.09k | false, |
2018 | 2.09k | &rtargetlist); |
2019 | | |
2020 | | /* |
2021 | | * Verify that the two children have the same number of non-junk |
2022 | | * columns, and determine the types of the merged output columns. |
2023 | | */ |
2024 | 2.09k | if (list_length(ltargetlist) != list_length(rtargetlist)) |
2025 | 2.09k | ereport(ERROR, |
2026 | 2.09k | (errcode(ERRCODE_SYNTAX_ERROR), |
2027 | 2.09k | errmsg("each %s query must have the same number of columns", |
2028 | 2.09k | context), |
2029 | 2.09k | parser_errposition(pstate, |
2030 | 2.09k | exprLocation((Node *) rtargetlist)))); |
2031 | | |
2032 | 2.09k | if (targetlist) |
2033 | 1.62k | *targetlist = NIL; |
2034 | 2.09k | op->colTypes = NIL; |
2035 | 2.09k | op->colTypmods = NIL; |
2036 | 2.09k | op->colCollations = NIL; |
2037 | 2.09k | op->groupClauses = NIL; |
2038 | 2.09k | forboth(ltl, ltargetlist, rtl, rtargetlist) |
2039 | 4.41k | { |
2040 | 4.41k | TargetEntry *ltle = (TargetEntry *) lfirst(ltl); |
2041 | 4.41k | TargetEntry *rtle = (TargetEntry *) lfirst(rtl); |
2042 | 4.41k | Node *lcolnode = (Node *) ltle->expr; |
2043 | 4.41k | Node *rcolnode = (Node *) rtle->expr; |
2044 | 4.41k | Oid lcoltype = exprType(lcolnode); |
2045 | 4.41k | Oid rcoltype = exprType(rcolnode); |
2046 | 4.41k | int32 lcoltypmod = exprTypmod(lcolnode); |
2047 | 4.41k | int32 rcoltypmod = exprTypmod(rcolnode); |
2048 | 4.41k | Node *bestexpr; |
2049 | 4.41k | int bestlocation; |
2050 | 4.41k | Oid rescoltype; |
2051 | 4.41k | int32 rescoltypmod; |
2052 | 4.41k | Oid rescolcoll; |
2053 | | |
2054 | | /* select common type, same as CASE et al */ |
2055 | 4.41k | rescoltype = select_common_type(pstate, |
2056 | 4.41k | list_make2(lcolnode, rcolnode), |
2057 | 4.41k | context, |
2058 | 4.41k | &bestexpr); |
2059 | 4.41k | bestlocation = exprLocation(bestexpr); |
2060 | | /* if same type and same typmod, use typmod; else default */ |
2061 | 4.41k | if (lcoltype == rcoltype && lcoltypmod == rcoltypmod4.35k ) |
2062 | 4.35k | rescoltypmod = lcoltypmod; |
2063 | 59 | else |
2064 | 59 | rescoltypmod = -1; |
2065 | | |
2066 | | /* |
2067 | | * Verify the coercions are actually possible. If not, we'd fail |
2068 | | * later anyway, but we want to fail now while we have sufficient |
2069 | | * context to produce an error cursor position. |
2070 | | * |
2071 | | * For all non-UNKNOWN-type cases, we verify coercibility but we |
2072 | | * don't modify the child's expression, for fear of changing the |
2073 | | * child query's semantics. |
2074 | | * |
2075 | | * If a child expression is an UNKNOWN-type Const or Param, we |
2076 | | * want to replace it with the coerced expression. This can only |
2077 | | * happen when the child is a leaf set-op node. It's safe to |
2078 | | * replace the expression because if the child query's semantics |
2079 | | * depended on the type of this output column, it'd have already |
2080 | | * coerced the UNKNOWN to something else. We want to do this |
2081 | | * because (a) we want to verify that a Const is valid for the |
2082 | | * target type, or resolve the actual type of an UNKNOWN Param, |
2083 | | * and (b) we want to avoid unnecessary discrepancies between the |
2084 | | * output type of the child query and the resolved target type. |
2085 | | * Such a discrepancy would disable optimization in the planner. |
2086 | | * |
2087 | | * If it's some other UNKNOWN-type node, eg a Var, we do nothing |
2088 | | * (knowing that coerce_to_common_type would fail). The planner |
2089 | | * is sometimes able to fold an UNKNOWN Var to a constant before |
2090 | | * it has to coerce the type, so failing now would just break |
2091 | | * cases that might work. |
2092 | | */ |
2093 | 4.41k | if (lcoltype != UNKNOWNOID) |
2094 | 4.40k | lcolnode = coerce_to_common_type(pstate, lcolnode, |
2095 | 4.40k | rescoltype, context); |
2096 | 9 | else if (IsA(lcolnode, Const) || |
2097 | 9 | IsA0 (lcolnode, Param)) |
2098 | 9 | { |
2099 | 9 | lcolnode = coerce_to_common_type(pstate, lcolnode, |
2100 | 9 | rescoltype, context); |
2101 | 9 | ltle->expr = (Expr *) lcolnode; |
2102 | 9 | } |
2103 | | |
2104 | 4.41k | if (rcoltype != UNKNOWNOID) |
2105 | 4.36k | rcolnode = coerce_to_common_type(pstate, rcolnode, |
2106 | 4.36k | rescoltype, context); |
2107 | 48 | else if (IsA(rcolnode, Const) || |
2108 | 48 | IsA0 (rcolnode, Param)) |
2109 | 48 | { |
2110 | 48 | rcolnode = coerce_to_common_type(pstate, rcolnode, |
2111 | 48 | rescoltype, context); |
2112 | 48 | rtle->expr = (Expr *) rcolnode; |
2113 | 48 | } |
2114 | | |
2115 | | /* |
2116 | | * Select common collation. A common collation is required for |
2117 | | * all set operators except UNION ALL; see SQL:2008 7.13 <query |
2118 | | * expression> Syntax Rule 15c. (If we fail to identify a common |
2119 | | * collation for a UNION ALL column, the curCollations element |
2120 | | * will be set to InvalidOid, which may result in a runtime error |
2121 | | * if something at a higher query level wants to use the column's |
2122 | | * collation.) |
2123 | | */ |
2124 | 4.41k | rescolcoll = select_common_collation(pstate, |
2125 | 4.41k | list_make2(lcolnode, rcolnode), |
2126 | 4.41k | (op->op == SETOP_UNION && op->all4.37k )); |
2127 | | |
2128 | | /* emit results */ |
2129 | 4.41k | op->colTypes = lappend_oid(op->colTypes, rescoltype); |
2130 | 4.41k | op->colTypmods = lappend_int(op->colTypmods, rescoltypmod); |
2131 | 4.41k | op->colCollations = lappend_oid(op->colCollations, rescolcoll); |
2132 | | |
2133 | | /* |
2134 | | * For all cases except UNION ALL, identify the grouping operators |
2135 | | * (and, if available, sorting operators) that will be used to |
2136 | | * eliminate duplicates. |
2137 | | */ |
2138 | 4.41k | if (op->op != SETOP_UNION || !op->all4.37k ) |
2139 | 3.35k | { |
2140 | 3.35k | SortGroupClause *grpcl = makeNode(SortGroupClause); |
2141 | 0 | Oid sortop; |
2142 | 3.35k | Oid eqop; |
2143 | 3.35k | bool hashable; |
2144 | 3.35k | ParseCallbackState pcbstate; |
2145 | | |
2146 | 3.35k | setup_parser_errposition_callback(&pcbstate, pstate, |
2147 | 3.35k | bestlocation); |
2148 | | |
2149 | | /* determine the eqop and optional sortop */ |
2150 | 3.35k | get_sort_group_operators(rescoltype, |
2151 | 3.35k | false, true, false, |
2152 | 3.35k | &sortop, &eqop, NULL, |
2153 | 3.35k | &hashable); |
2154 | | |
2155 | 3.35k | cancel_parser_errposition_callback(&pcbstate); |
2156 | | |
2157 | | /* we don't have a tlist yet, so can't assign sortgrouprefs */ |
2158 | 3.35k | grpcl->tleSortGroupRef = 0; |
2159 | 3.35k | grpcl->eqop = eqop; |
2160 | 3.35k | grpcl->sortop = sortop; |
2161 | 3.35k | grpcl->nulls_first = false; /* OK with or without sortop */ |
2162 | 3.35k | grpcl->hashable = hashable; |
2163 | | |
2164 | 3.35k | op->groupClauses = lappend(op->groupClauses, grpcl); |
2165 | 3.35k | } |
2166 | | |
2167 | | /* |
2168 | | * Construct a dummy tlist entry to return. We use a SetToDefault |
2169 | | * node for the expression, since it carries exactly the fields |
2170 | | * needed, but any other expression node type would do as well. |
2171 | | */ |
2172 | 4.41k | if (targetlist) |
2173 | 3.50k | { |
2174 | 3.50k | SetToDefault *rescolnode = makeNode(SetToDefault); |
2175 | 0 | TargetEntry *restle; |
2176 | | |
2177 | 3.50k | rescolnode->typeId = rescoltype; |
2178 | 3.50k | rescolnode->typeMod = rescoltypmod; |
2179 | 3.50k | rescolnode->collation = rescolcoll; |
2180 | 3.50k | rescolnode->location = bestlocation; |
2181 | 3.50k | restle = makeTargetEntry((Expr *) rescolnode, |
2182 | 3.50k | 0, /* no need to set resno */ |
2183 | 3.50k | NULL, |
2184 | 3.50k | false); |
2185 | 3.50k | *targetlist = lappend(*targetlist, restle); |
2186 | 3.50k | } |
2187 | 4.41k | } |
2188 | | |
2189 | 2.09k | return (Node *) op; |
2190 | 2.09k | } |
2191 | 4.65k | } |
2192 | | |
2193 | | /* |
2194 | | * Process the outputs of the non-recursive term of a recursive union |
2195 | | * to set up the parent CTE's columns |
2196 | | */ |
2197 | | static void |
2198 | | determineRecursiveColTypes(ParseState *pstate, Node *larg, List *nrtargetlist) |
2199 | 51 | { |
2200 | 51 | Node *node; |
2201 | 51 | int leftmostRTI; |
2202 | 51 | Query *leftmostQuery; |
2203 | 51 | List *targetList; |
2204 | 51 | ListCell *left_tlist; |
2205 | 51 | ListCell *nrtl; |
2206 | 51 | int next_resno; |
2207 | | |
2208 | | /* |
2209 | | * Find leftmost leaf SELECT |
2210 | | */ |
2211 | 51 | node = larg; |
2212 | 51 | while (node && IsA(node, SetOperationStmt)) |
2213 | 0 | node = ((SetOperationStmt *) node)->larg; |
2214 | 51 | Assert(node && IsA(node, RangeTblRef)); |
2215 | 51 | leftmostRTI = ((RangeTblRef *) node)->rtindex; |
2216 | 51 | leftmostQuery = rt_fetch(leftmostRTI, pstate->p_rtable)->subquery; |
2217 | 51 | Assert(leftmostQuery != NULL); |
2218 | | |
2219 | | /* |
2220 | | * Generate dummy targetlist using column names of leftmost select and |
2221 | | * dummy result expressions of the non-recursive term. |
2222 | | */ |
2223 | 51 | targetList = NIL; |
2224 | 51 | left_tlist = list_head(leftmostQuery->targetList); |
2225 | 51 | next_resno = 1; |
2226 | | |
2227 | 51 | foreach(nrtl, nrtargetlist) |
2228 | 94 | { |
2229 | 94 | TargetEntry *nrtle = (TargetEntry *) lfirst(nrtl); |
2230 | 94 | TargetEntry *lefttle = (TargetEntry *) lfirst(left_tlist); |
2231 | 94 | char *colName; |
2232 | 94 | TargetEntry *tle; |
2233 | | |
2234 | 94 | Assert(!lefttle->resjunk); |
2235 | 94 | colName = pstrdup(lefttle->resname); |
2236 | 94 | tle = makeTargetEntry(nrtle->expr, |
2237 | 94 | next_resno++, |
2238 | 94 | colName, |
2239 | 94 | false); |
2240 | 94 | targetList = lappend(targetList, tle); |
2241 | 94 | left_tlist = lnext(left_tlist); |
2242 | 94 | } |
2243 | | |
2244 | | /* Now build CTE's output column info using dummy targetlist */ |
2245 | 51 | analyzeCTETargetList(pstate, pstate->p_parent_cte, targetList); |
2246 | 51 | } |
2247 | | |
2248 | | |
2249 | | /* |
2250 | | * transformUpdateStmt - |
2251 | | * transforms an update statement |
2252 | | */ |
2253 | | static Query * |
2254 | | transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt) |
2255 | 29.3k | { |
2256 | 29.3k | Query *qry = makeNode(Query); |
2257 | 0 | ParseNamespaceItem *nsitem; |
2258 | 29.3k | Node *qual; |
2259 | | |
2260 | 29.3k | qry->commandType = CMD_UPDATE; |
2261 | 29.3k | pstate->p_is_insert = false; |
2262 | | |
2263 | | /* process the WITH clause independently of all else */ |
2264 | 29.3k | if (stmt->withClause) |
2265 | 712 | { |
2266 | 712 | qry->hasRecursive = stmt->withClause->recursive; |
2267 | 712 | qry->cteList = transformWithClause(pstate, stmt->withClause); |
2268 | 712 | qry->hasModifyingCTE = pstate->p_hasModifyingCTE; |
2269 | 712 | } |
2270 | | |
2271 | 29.3k | qry->resultRelation = setTargetTable(pstate, stmt->relation, |
2272 | 29.3k | stmt->relation->inh, |
2273 | 29.3k | true, |
2274 | 29.3k | ACL_UPDATE); |
2275 | | |
2276 | | /* grab the namespace item made by setTargetTable */ |
2277 | 29.3k | nsitem = (ParseNamespaceItem *) llast(pstate->p_namespace); |
2278 | | |
2279 | | /* subqueries in FROM cannot access the result relation */ |
2280 | 29.3k | nsitem->p_lateral_only = true; |
2281 | 29.3k | nsitem->p_lateral_ok = false; |
2282 | | |
2283 | | /* |
2284 | | * the FROM clause is non-standard SQL syntax. We used to be able to do |
2285 | | * this with REPLACE in POSTQUEL so we keep the feature. |
2286 | | */ |
2287 | 29.3k | transformFromClause(pstate, stmt->fromClause); |
2288 | | |
2289 | | /* remaining clauses can reference the result relation normally */ |
2290 | 29.3k | nsitem->p_lateral_only = false; |
2291 | 29.3k | nsitem->p_lateral_ok = true; |
2292 | | |
2293 | 29.3k | qual = transformWhereClause(pstate, stmt->whereClause, |
2294 | 29.3k | EXPR_KIND_WHERE, "WHERE"); |
2295 | | |
2296 | 29.3k | qry->returningList = transformReturningList(pstate, stmt->returningList); |
2297 | | |
2298 | | /* |
2299 | | * Now we are done with SELECT-like processing, and can get on with |
2300 | | * transforming the target list to match the UPDATE target columns. |
2301 | | */ |
2302 | 29.3k | qry->targetList = transformUpdateTargetList(pstate, stmt->targetList); |
2303 | | |
2304 | 29.3k | qry->rtable = pstate->p_rtable; |
2305 | 29.3k | qry->jointree = makeFromExpr(pstate->p_joinlist, qual); |
2306 | | |
2307 | 29.3k | qry->hasTargetSRFs = pstate->p_hasTargetSRFs; |
2308 | 29.3k | qry->hasSubLinks = pstate->p_hasSubLinks; |
2309 | | |
2310 | 29.3k | assign_query_collations(pstate, qry); |
2311 | | |
2312 | 29.3k | return qry; |
2313 | 29.3k | } |
2314 | | |
2315 | | /* |
2316 | | * transformUpdateTargetList - |
2317 | | * handle SET clause in UPDATE/INSERT ... ON CONFLICT UPDATE |
2318 | | */ |
2319 | | static List * |
2320 | | transformUpdateTargetList(ParseState *pstate, List *origTlist) |
2321 | 36.7k | { |
2322 | 36.7k | List *tlist = NIL; |
2323 | 36.7k | RangeTblEntry *target_rte; |
2324 | 36.7k | ListCell *orig_tl; |
2325 | 36.7k | ListCell *tl; |
2326 | | |
2327 | 36.7k | tlist = transformTargetList(pstate, origTlist, |
2328 | 36.7k | EXPR_KIND_UPDATE_SOURCE); |
2329 | | |
2330 | | /* Prepare to assign non-conflicting resnos to resjunk attributes */ |
2331 | 36.7k | if (pstate->p_next_resno <= RelationGetNumberOfAttributes(pstate->p_target_relation)) |
2332 | 36.6k | pstate->p_next_resno = RelationGetNumberOfAttributes(pstate->p_target_relation) + 1; |
2333 | | |
2334 | | /* Prepare non-junk columns for assignment to target table */ |
2335 | 36.7k | target_rte = pstate->p_target_rangetblentry; |
2336 | 36.7k | orig_tl = list_head(origTlist); |
2337 | | |
2338 | 36.7k | foreach(tl, tlist) |
2339 | 37.4k | { |
2340 | 37.4k | TargetEntry *tle = (TargetEntry *) lfirst(tl); |
2341 | 37.4k | ResTarget *origTarget; |
2342 | 37.4k | int attrno; |
2343 | | |
2344 | 37.4k | if (tle->resjunk) |
2345 | 2 | { |
2346 | | /* |
2347 | | * Resjunk nodes need no additional processing, but be sure they |
2348 | | * have resnos that do not match any target columns; else rewriter |
2349 | | * or planner might get confused. They don't need a resname |
2350 | | * either. |
2351 | | */ |
2352 | 2 | tle->resno = (AttrNumber) pstate->p_next_resno++; |
2353 | 2 | tle->resname = NULL; |
2354 | 2 | continue; |
2355 | 2 | } |
2356 | 37.4k | if (orig_tl == NULL) |
2357 | 0 | elog(ERROR, "UPDATE target count mismatch --- internal error"); |
2358 | 37.4k | origTarget = lfirst_node(ResTarget, orig_tl); |
2359 | | |
2360 | 37.4k | attrno = attnameAttNum(pstate->p_target_relation, |
2361 | 37.4k | origTarget->name, true); |
2362 | 37.4k | if (attrno == InvalidAttrNumber) |
2363 | 37.4k | ereport(ERROR, |
2364 | 37.4k | (errcode(ERRCODE_UNDEFINED_COLUMN), |
2365 | 37.4k | errmsg("column \"%s\" of relation \"%s\" does not exist", |
2366 | 37.4k | origTarget->name, |
2367 | 37.4k | RelationGetRelationName(pstate->p_target_relation)), |
2368 | 37.4k | parser_errposition(pstate, origTarget->location))); |
2369 | | |
2370 | 37.4k | updateTargetListEntry(pstate, tle, origTarget->name, |
2371 | 37.4k | attrno, |
2372 | 37.4k | origTarget->indirection, |
2373 | 37.4k | origTarget->location); |
2374 | | |
2375 | | /* Mark the target column as requiring update permissions */ |
2376 | 37.4k | target_rte->updatedCols = bms_add_member(target_rte->updatedCols, |
2377 | 37.4k | attrno - YBGetFirstLowInvalidAttributeNumber(pstate->p_target_relation)); |
2378 | | |
2379 | 37.4k | orig_tl = lnext(orig_tl); |
2380 | 37.4k | } |
2381 | 36.7k | if (orig_tl != NULL) |
2382 | 0 | elog(ERROR, "UPDATE target count mismatch --- internal error"); |
2383 | | |
2384 | 36.7k | return tlist; |
2385 | 36.7k | } |
2386 | | |
2387 | | /* |
2388 | | * transformReturningList - |
2389 | | * handle a RETURNING clause in INSERT/UPDATE/DELETE |
2390 | | */ |
2391 | | static List * |
2392 | | transformReturningList(ParseState *pstate, List *returningList) |
2393 | 33.9k | { |
2394 | 33.9k | List *rlist; |
2395 | 33.9k | int save_next_resno; |
2396 | | |
2397 | 33.9k | if (returningList == NIL) |
2398 | 31.6k | return NIL; /* nothing to do */ |
2399 | | |
2400 | | /* |
2401 | | * We need to assign resnos starting at one in the RETURNING list. Save |
2402 | | * and restore the main tlist's value of p_next_resno, just in case |
2403 | | * someone looks at it later (probably won't happen). |
2404 | | */ |
2405 | 2.27k | save_next_resno = pstate->p_next_resno; |
2406 | 2.27k | pstate->p_next_resno = 1; |
2407 | | |
2408 | | /* transform RETURNING identically to a SELECT targetlist */ |
2409 | 2.27k | rlist = transformTargetList(pstate, returningList, EXPR_KIND_RETURNING); |
2410 | | |
2411 | | /* |
2412 | | * Complain if the nonempty tlist expanded to nothing (which is possible |
2413 | | * if it contains only a star-expansion of a zero-column table). If we |
2414 | | * allow this, the parsed Query will look like it didn't have RETURNING, |
2415 | | * with results that would probably surprise the user. |
2416 | | */ |
2417 | 2.27k | if (rlist == NIL) |
2418 | 2.27k | ereport(ERROR, |
2419 | 2.27k | (errcode(ERRCODE_SYNTAX_ERROR), |
2420 | 2.27k | errmsg("RETURNING must have at least one column"), |
2421 | 2.27k | parser_errposition(pstate, |
2422 | 2.27k | exprLocation(linitial(returningList))))); |
2423 | | |
2424 | | /* mark column origins */ |
2425 | 2.27k | markTargetListOrigins(pstate, rlist); |
2426 | | |
2427 | | /* resolve any still-unresolved output columns as being type text */ |
2428 | 2.27k | if (pstate->p_resolve_unknowns) |
2429 | 2.26k | resolveTargetListUnknowns(pstate, rlist); |
2430 | | |
2431 | | /* restore state */ |
2432 | 2.27k | pstate->p_next_resno = save_next_resno; |
2433 | | |
2434 | 2.27k | return rlist; |
2435 | 2.27k | } |
2436 | | |
2437 | | |
2438 | | /* |
2439 | | * transformDeclareCursorStmt - |
2440 | | * transform a DECLARE CURSOR Statement |
2441 | | * |
2442 | | * DECLARE CURSOR is like other utility statements in that we emit it as a |
2443 | | * CMD_UTILITY Query node; however, we must first transform the contained |
2444 | | * query. We used to postpone that until execution, but it's really necessary |
2445 | | * to do it during the normal parse analysis phase to ensure that side effects |
2446 | | * of parser hooks happen at the expected time. |
2447 | | */ |
2448 | | static Query * |
2449 | | transformDeclareCursorStmt(ParseState *pstate, DeclareCursorStmt *stmt) |
2450 | 1.55k | { |
2451 | 1.55k | Query *result; |
2452 | 1.55k | Query *query; |
2453 | | |
2454 | | /* |
2455 | | * Don't allow both SCROLL and NO SCROLL to be specified |
2456 | | */ |
2457 | 1.55k | if ((stmt->options & CURSOR_OPT_SCROLL) && |
2458 | 1.55k | (stmt->options & 31 CURSOR_OPT_NO_SCROLL31 )) |
2459 | 1.55k | ereport(ERROR, |
2460 | 1.55k | (errcode(ERRCODE_INVALID_CURSOR_DEFINITION), |
2461 | 1.55k | errmsg("cannot specify both SCROLL and NO SCROLL"))); |
2462 | | |
2463 | | /* Transform contained query, not allowing SELECT INTO */ |
2464 | 1.55k | query = transformStmt(pstate, stmt->query); |
2465 | 1.55k | stmt->query = (Node *) query; |
2466 | | |
2467 | | /* Grammar should not have allowed anything but SELECT */ |
2468 | 1.55k | if (!IsA(query, Query) || |
2469 | 1.55k | query->commandType != CMD_SELECT1.54k ) |
2470 | 0 | elog(ERROR, "unexpected non-SELECT command in DECLARE CURSOR"); |
2471 | | |
2472 | | /* |
2473 | | * We also disallow data-modifying WITH in a cursor. (This could be |
2474 | | * allowed, but the semantics of when the updates occur might be |
2475 | | * surprising.) |
2476 | | */ |
2477 | 1.55k | if (query->hasModifyingCTE) |
2478 | 1.55k | ereport(ERROR, |
2479 | 1.55k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2480 | 1.55k | errmsg("DECLARE CURSOR must not contain data-modifying statements in WITH"))); |
2481 | | |
2482 | | /* FOR UPDATE and WITH HOLD are not compatible */ |
2483 | 1.55k | if (query->rowMarks != NIL && (stmt->options & 9 CURSOR_OPT_HOLD9 )) |
2484 | 1.55k | ereport(ERROR, |
2485 | 1.55k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2486 | | /*------ |
2487 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2488 | 1.55k | errmsg("DECLARE CURSOR WITH HOLD ... %s is not supported", |
2489 | 1.55k | LCS_asString(((RowMarkClause *) |
2490 | 1.55k | linitial(query->rowMarks))->strength)), |
2491 | 1.55k | errdetail("Holdable cursors must be READ ONLY."))); |
2492 | | |
2493 | | /* FOR UPDATE and SCROLL are not compatible */ |
2494 | 1.55k | if (query->rowMarks != NIL && (stmt->options & 9 CURSOR_OPT_SCROLL9 )) |
2495 | 1.55k | ereport(ERROR, |
2496 | 1.55k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2497 | | /*------ |
2498 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2499 | 1.55k | errmsg("DECLARE SCROLL CURSOR ... %s is not supported", |
2500 | 1.55k | LCS_asString(((RowMarkClause *) |
2501 | 1.55k | linitial(query->rowMarks))->strength)), |
2502 | 1.55k | errdetail("Scrollable cursors must be READ ONLY."))); |
2503 | | |
2504 | | /* FOR UPDATE and INSENSITIVE are not compatible */ |
2505 | 1.55k | if (query->rowMarks != NIL && (stmt->options & 9 CURSOR_OPT_INSENSITIVE9 )) |
2506 | 1.55k | ereport(ERROR, |
2507 | 1.55k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2508 | | /*------ |
2509 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2510 | 1.55k | errmsg("DECLARE INSENSITIVE CURSOR ... %s is not supported", |
2511 | 1.55k | LCS_asString(((RowMarkClause *) |
2512 | 1.55k | linitial(query->rowMarks))->strength)), |
2513 | 1.55k | errdetail("Insensitive cursors must be READ ONLY."))); |
2514 | | |
2515 | | /* represent the command as a utility Query */ |
2516 | 1.55k | result = makeNode(Query); |
2517 | 0 | result->commandType = CMD_UTILITY; |
2518 | 1.55k | result->utilityStmt = (Node *) stmt; |
2519 | | |
2520 | 1.55k | return result; |
2521 | 1.55k | } |
2522 | | |
2523 | | |
2524 | | /* |
2525 | | * transformExplainStmt - |
2526 | | * transform an EXPLAIN Statement |
2527 | | * |
2528 | | * EXPLAIN is like other utility statements in that we emit it as a |
2529 | | * CMD_UTILITY Query node; however, we must first transform the contained |
2530 | | * query. We used to postpone that until execution, but it's really necessary |
2531 | | * to do it during the normal parse analysis phase to ensure that side effects |
2532 | | * of parser hooks happen at the expected time. |
2533 | | */ |
2534 | | static Query * |
2535 | | transformExplainStmt(ParseState *pstate, ExplainStmt *stmt) |
2536 | 2.73k | { |
2537 | 2.73k | Query *result; |
2538 | | |
2539 | | /* transform contained query, allowing SELECT INTO */ |
2540 | 2.73k | stmt->query = (Node *) transformOptionalSelectInto(pstate, stmt->query); |
2541 | | |
2542 | | /* represent the command as a utility Query */ |
2543 | 2.73k | result = makeNode(Query); |
2544 | 0 | result->commandType = CMD_UTILITY; |
2545 | 2.73k | result->utilityStmt = (Node *) stmt; |
2546 | | |
2547 | 2.73k | return result; |
2548 | 2.73k | } |
2549 | | |
2550 | | |
2551 | | /* |
2552 | | * transformCreateTableAsStmt - |
2553 | | * transform a CREATE TABLE AS, SELECT ... INTO, or CREATE MATERIALIZED VIEW |
2554 | | * Statement |
2555 | | * |
2556 | | * As with DECLARE CURSOR and EXPLAIN, transform the contained statement now. |
2557 | | */ |
2558 | | static Query * |
2559 | | transformCreateTableAsStmt(ParseState *pstate, CreateTableAsStmt *stmt) |
2560 | 110 | { |
2561 | 110 | Query *result; |
2562 | 110 | Query *query; |
2563 | | |
2564 | | /* transform contained query, not allowing SELECT INTO */ |
2565 | 110 | query = transformStmt(pstate, stmt->query); |
2566 | 110 | stmt->query = (Node *) query; |
2567 | | |
2568 | | /* additional work needed for CREATE MATERIALIZED VIEW */ |
2569 | 110 | if (stmt->relkind == OBJECT_MATVIEW) |
2570 | 44 | { |
2571 | | /* |
2572 | | * Prohibit a data-modifying CTE in the query used to create a |
2573 | | * materialized view. It's not sufficiently clear what the user would |
2574 | | * want to happen if the MV is refreshed or incrementally maintained. |
2575 | | */ |
2576 | 44 | if (query->hasModifyingCTE) |
2577 | 44 | ereport(ERROR, |
2578 | 44 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2579 | 44 | errmsg("materialized views must not use data-modifying statements in WITH"))); |
2580 | | |
2581 | | /* |
2582 | | * Check whether any temporary database objects are used in the |
2583 | | * creation query. It would be hard to refresh data or incrementally |
2584 | | * maintain it if a source disappeared. |
2585 | | */ |
2586 | 44 | if (isQueryUsingTempRelation(query)) |
2587 | 44 | ereport(ERROR, |
2588 | 44 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2589 | 44 | errmsg("materialized views must not use temporary tables or views"))); |
2590 | | |
2591 | | /* |
2592 | | * A materialized view would either need to save parameters for use in |
2593 | | * maintaining/loading the data or prohibit them entirely. The latter |
2594 | | * seems safer and more sane. |
2595 | | */ |
2596 | 44 | if (query_contains_extern_params(query)) |
2597 | 44 | ereport(ERROR, |
2598 | 44 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2599 | 44 | errmsg("materialized views may not be defined using bound parameters"))); |
2600 | | |
2601 | | /* |
2602 | | * For now, we disallow unlogged materialized views, because it seems |
2603 | | * like a bad idea for them to just go to empty after a crash. (If we |
2604 | | * could mark them as unpopulated, that would be better, but that |
2605 | | * requires catalog changes which crash recovery can't presently |
2606 | | * handle.) |
2607 | | */ |
2608 | 44 | if (stmt->into->rel->relpersistence == RELPERSISTENCE_UNLOGGED) |
2609 | 44 | ereport(ERROR, |
2610 | 44 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2611 | 44 | errmsg("materialized views cannot be UNLOGGED"))); |
2612 | | |
2613 | | /* |
2614 | | * At runtime, we'll need a copy of the parsed-but-not-rewritten Query |
2615 | | * for purposes of creating the view's ON SELECT rule. We stash that |
2616 | | * in the IntoClause because that's where intorel_startup() can |
2617 | | * conveniently get it from. |
2618 | | */ |
2619 | 44 | stmt->into->viewQuery = (Node *) copyObject(query); |
2620 | 44 | } |
2621 | | |
2622 | | /* represent the command as a utility Query */ |
2623 | 110 | result = makeNode(Query); |
2624 | 0 | result->commandType = CMD_UTILITY; |
2625 | 110 | result->utilityStmt = (Node *) stmt; |
2626 | | |
2627 | 110 | return result; |
2628 | 110 | } |
2629 | | |
2630 | | /* |
2631 | | * transform a CallStmt |
2632 | | * |
2633 | | * We need to do parse analysis on the procedure call and its arguments. |
2634 | | */ |
2635 | | static Query * |
2636 | | transformCallStmt(ParseState *pstate, CallStmt *stmt) |
2637 | 426 | { |
2638 | 426 | List *targs; |
2639 | 426 | ListCell *lc; |
2640 | 426 | Node *node; |
2641 | 426 | Query *result; |
2642 | | |
2643 | 426 | targs = NIL; |
2644 | 426 | foreach(lc, stmt->funccall->args) |
2645 | 422 | { |
2646 | 422 | targs = lappend(targs, transformExpr(pstate, |
2647 | 422 | (Node *) lfirst(lc), |
2648 | 422 | EXPR_KIND_CALL_ARGUMENT)); |
2649 | 422 | } |
2650 | | |
2651 | 426 | node = ParseFuncOrColumn(pstate, |
2652 | 426 | stmt->funccall->funcname, |
2653 | 426 | targs, |
2654 | 426 | pstate->p_last_srf, |
2655 | 426 | stmt->funccall, |
2656 | 426 | true, |
2657 | 426 | stmt->funccall->location); |
2658 | | |
2659 | 426 | assign_expr_collations(pstate, node); |
2660 | | |
2661 | 426 | stmt->funcexpr = castNode(FuncExpr, node); |
2662 | | |
2663 | 426 | result = makeNode(Query); |
2664 | 0 | result->commandType = CMD_UTILITY; |
2665 | 426 | result->utilityStmt = (Node *) stmt; |
2666 | | |
2667 | 426 | return result; |
2668 | 426 | } |
2669 | | |
2670 | | /* |
2671 | | * Produce a string representation of a LockClauseStrength value. |
2672 | | * This should only be applied to valid values (not LCS_NONE). |
2673 | | */ |
2674 | | const char * |
2675 | | LCS_asString(LockClauseStrength strength) |
2676 | 3 | { |
2677 | 3 | switch (strength) |
2678 | 3 | { |
2679 | 0 | case LCS_NONE: |
2680 | 0 | Assert(false); |
2681 | 0 | break; |
2682 | 0 | case LCS_FORKEYSHARE: |
2683 | 0 | return "FOR KEY SHARE"; |
2684 | 0 | case LCS_FORSHARE: |
2685 | 0 | return "FOR SHARE"; |
2686 | 0 | case LCS_FORNOKEYUPDATE: |
2687 | 0 | return "FOR NO KEY UPDATE"; |
2688 | 3 | case LCS_FORUPDATE: |
2689 | 3 | return "FOR UPDATE"; |
2690 | 3 | } |
2691 | 0 | return "FOR some"; /* shouldn't happen */ |
2692 | 3 | } |
2693 | | |
2694 | | /* |
2695 | | * Check for features that are not supported with FOR [KEY] UPDATE/SHARE. |
2696 | | * |
2697 | | * exported so planner can check again after rewriting, query pullup, etc |
2698 | | */ |
2699 | | void |
2700 | | CheckSelectLocking(Query *qry, LockClauseStrength strength) |
2701 | 9.40k | { |
2702 | 9.40k | Assert(strength != LCS_NONE); /* else caller error */ |
2703 | | |
2704 | 9.40k | if (qry->setOperations) |
2705 | 9.40k | ereport(ERROR, |
2706 | 9.40k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2707 | | /*------ |
2708 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2709 | 9.40k | errmsg("%s is not allowed with UNION/INTERSECT/EXCEPT", |
2710 | 9.40k | LCS_asString(strength)))); |
2711 | 9.40k | if (qry->distinctClause != NIL) |
2712 | 9.40k | ereport(ERROR, |
2713 | 9.40k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2714 | | /*------ |
2715 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2716 | 9.40k | errmsg("%s is not allowed with DISTINCT clause", |
2717 | 9.40k | LCS_asString(strength)))); |
2718 | 9.40k | if (qry->groupClause != NIL || qry->groupingSets != NIL) |
2719 | 9.40k | ereport(ERROR, |
2720 | 9.40k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2721 | | /*------ |
2722 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2723 | 9.40k | errmsg("%s is not allowed with GROUP BY clause", |
2724 | 9.40k | LCS_asString(strength)))); |
2725 | 9.40k | if (qry->havingQual != NULL) |
2726 | 9.40k | ereport(ERROR, |
2727 | 9.40k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2728 | | /*------ |
2729 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2730 | 9.40k | errmsg("%s is not allowed with HAVING clause", |
2731 | 9.40k | LCS_asString(strength)))); |
2732 | 9.40k | if (qry->hasAggs) |
2733 | 9.40k | ereport(ERROR, |
2734 | 9.40k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2735 | | /*------ |
2736 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2737 | 9.40k | errmsg("%s is not allowed with aggregate functions", |
2738 | 9.40k | LCS_asString(strength)))); |
2739 | 9.40k | if (qry->hasWindowFuncs) |
2740 | 9.40k | ereport(ERROR, |
2741 | 9.40k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2742 | | /*------ |
2743 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2744 | 9.40k | errmsg("%s is not allowed with window functions", |
2745 | 9.40k | LCS_asString(strength)))); |
2746 | 9.40k | if (qry->hasTargetSRFs) |
2747 | 9.40k | ereport(ERROR, |
2748 | 9.40k | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2749 | | /*------ |
2750 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2751 | 9.40k | errmsg("%s is not allowed with set-returning functions in the target list", |
2752 | 9.40k | LCS_asString(strength)))); |
2753 | 9.40k | } |
2754 | | |
2755 | | /* |
2756 | | * Transform a FOR [KEY] UPDATE/SHARE clause |
2757 | | * |
2758 | | * This basically involves replacing names by integer relids. |
2759 | | * |
2760 | | * NB: if you need to change this, see also markQueryForLocking() |
2761 | | * in rewriteHandler.c, and isLockedRefname() in parse_relation.c. |
2762 | | */ |
2763 | | static void |
2764 | | transformLockingClause(ParseState *pstate, Query *qry, LockingClause *lc, |
2765 | | bool pushedDown) |
2766 | 4.64k | { |
2767 | 4.64k | List *lockedRels = lc->lockedRels; |
2768 | 4.64k | ListCell *l; |
2769 | 4.64k | ListCell *rt; |
2770 | 4.64k | Index i; |
2771 | 4.64k | LockingClause *allrels; |
2772 | | |
2773 | 4.64k | CheckSelectLocking(qry, lc->strength); |
2774 | | |
2775 | | /* make a clause we can pass down to subqueries to select all rels */ |
2776 | 4.64k | allrels = makeNode(LockingClause); |
2777 | 4.64k | allrels->lockedRels = NIL; /* indicates all rels */ |
2778 | 4.64k | allrels->strength = lc->strength; |
2779 | 4.64k | allrels->waitPolicy = lc->waitPolicy; |
2780 | | |
2781 | 4.64k | if (lockedRels == NIL) |
2782 | 2.81k | { |
2783 | | /* |
2784 | | * Lock all regular tables used in query and its subqueries. We |
2785 | | * examine inFromCl to exclude auto-added RTEs, particularly NEW/OLD |
2786 | | * in rules. This is a bit of an abuse of a mostly-obsolete flag, but |
2787 | | * it's convenient. We can't rely on the namespace mechanism that has |
2788 | | * largely replaced inFromCl, since for example we need to lock |
2789 | | * base-relation RTEs even if they are masked by upper joins. |
2790 | | */ |
2791 | 2.81k | i = 0; |
2792 | 2.81k | foreach(rt, qry->rtable) |
2793 | 2.82k | { |
2794 | 2.82k | RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt); |
2795 | | |
2796 | 2.82k | ++i; |
2797 | 2.82k | if (!rte->inFromCl) |
2798 | 2 | continue; |
2799 | 2.82k | switch (rte->rtekind) |
2800 | 2.82k | { |
2801 | 2.81k | case RTE_RELATION: |
2802 | 2.81k | applyLockingClause(qry, i, lc->strength, lc->waitPolicy, |
2803 | 2.81k | pushedDown); |
2804 | 2.81k | rte->requiredPerms |= ACL_SELECT_FOR_UPDATE; |
2805 | 2.81k | break; |
2806 | 0 | case RTE_SUBQUERY: |
2807 | 0 | applyLockingClause(qry, i, lc->strength, lc->waitPolicy, |
2808 | 0 | pushedDown); |
2809 | | |
2810 | | /* |
2811 | | * FOR UPDATE/SHARE of subquery is propagated to all of |
2812 | | * subquery's rels, too. We could do this later (based on |
2813 | | * the marking of the subquery RTE) but it is convenient |
2814 | | * to have local knowledge in each query level about which |
2815 | | * rels need to be opened with RowShareLock. |
2816 | | */ |
2817 | 0 | transformLockingClause(pstate, rte->subquery, |
2818 | 0 | allrels, true); |
2819 | 0 | break; |
2820 | 4 | default: |
2821 | | /* ignore JOIN, SPECIAL, FUNCTION, VALUES, CTE RTEs */ |
2822 | 4 | break; |
2823 | 2.82k | } |
2824 | 2.82k | } |
2825 | 2.81k | } |
2826 | 1.83k | else |
2827 | 1.83k | { |
2828 | | /* |
2829 | | * Lock just the named tables. As above, we allow locking any base |
2830 | | * relation regardless of alias-visibility rules, so we need to |
2831 | | * examine inFromCl to exclude OLD/NEW. |
2832 | | */ |
2833 | 1.83k | foreach(l, lockedRels) |
2834 | 1.82k | { |
2835 | 1.82k | RangeVar *thisrel = (RangeVar *) lfirst(l); |
2836 | | |
2837 | | /* For simplicity we insist on unqualified alias names here */ |
2838 | 1.82k | if (thisrel->catalogname || thisrel->schemaname) |
2839 | 1.82k | ereport(ERROR, |
2840 | 1.82k | (errcode(ERRCODE_SYNTAX_ERROR), |
2841 | | /*------ |
2842 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2843 | 1.82k | errmsg("%s must specify unqualified relation names", |
2844 | 1.82k | LCS_asString(lc->strength)), |
2845 | 1.82k | parser_errposition(pstate, thisrel->location))); |
2846 | | |
2847 | 1.82k | i = 0; |
2848 | 1.82k | foreach(rt, qry->rtable) |
2849 | 1.89k | { |
2850 | 1.89k | RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt); |
2851 | | |
2852 | 1.89k | ++i; |
2853 | 1.89k | if (!rte->inFromCl) |
2854 | 4 | continue; |
2855 | 1.89k | if (strcmp(rte->eref->aliasname, thisrel->relname) == 0) |
2856 | 1.82k | { |
2857 | 1.82k | switch (rte->rtekind) |
2858 | 1.82k | { |
2859 | 1.82k | case RTE_RELATION: |
2860 | 1.82k | applyLockingClause(qry, i, lc->strength, |
2861 | 1.82k | lc->waitPolicy, pushedDown); |
2862 | 1.82k | rte->requiredPerms |= ACL_SELECT_FOR_UPDATE; |
2863 | 1.82k | break; |
2864 | 2 | case RTE_SUBQUERY: |
2865 | 2 | applyLockingClause(qry, i, lc->strength, |
2866 | 2 | lc->waitPolicy, pushedDown); |
2867 | | /* see comment above */ |
2868 | 2 | transformLockingClause(pstate, rte->subquery, |
2869 | 2 | allrels, true); |
2870 | 2 | break; |
2871 | 0 | case RTE_JOIN: |
2872 | 0 | ereport(ERROR, |
2873 | 0 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2874 | | /*------ |
2875 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2876 | 0 | errmsg("%s cannot be applied to a join", |
2877 | 0 | LCS_asString(lc->strength)), |
2878 | 0 | parser_errposition(pstate, thisrel->location))); |
2879 | 0 | break; |
2880 | 0 | case RTE_FUNCTION: |
2881 | 0 | ereport(ERROR, |
2882 | 0 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2883 | | /*------ |
2884 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2885 | 0 | errmsg("%s cannot be applied to a function", |
2886 | 0 | LCS_asString(lc->strength)), |
2887 | 0 | parser_errposition(pstate, thisrel->location))); |
2888 | 0 | break; |
2889 | 0 | case RTE_TABLEFUNC: |
2890 | 0 | ereport(ERROR, |
2891 | 0 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2892 | | /*------ |
2893 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2894 | 0 | errmsg("%s cannot be applied to a table function", |
2895 | 0 | LCS_asString(lc->strength)), |
2896 | 0 | parser_errposition(pstate, thisrel->location))); |
2897 | 0 | break; |
2898 | 0 | case RTE_VALUES: |
2899 | 0 | ereport(ERROR, |
2900 | 0 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2901 | | /*------ |
2902 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2903 | 0 | errmsg("%s cannot be applied to VALUES", |
2904 | 0 | LCS_asString(lc->strength)), |
2905 | 0 | parser_errposition(pstate, thisrel->location))); |
2906 | 0 | break; |
2907 | 0 | case RTE_CTE: |
2908 | 0 | ereport(ERROR, |
2909 | 0 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2910 | | /*------ |
2911 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2912 | 0 | errmsg("%s cannot be applied to a WITH query", |
2913 | 0 | LCS_asString(lc->strength)), |
2914 | 0 | parser_errposition(pstate, thisrel->location))); |
2915 | 0 | break; |
2916 | 0 | case RTE_NAMEDTUPLESTORE: |
2917 | 0 | ereport(ERROR, |
2918 | 0 | (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), |
2919 | | /*------ |
2920 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2921 | 0 | errmsg("%s cannot be applied to a named tuplestore", |
2922 | 0 | LCS_asString(lc->strength)), |
2923 | 0 | parser_errposition(pstate, thisrel->location))); |
2924 | 0 | break; |
2925 | 0 | default: |
2926 | 0 | elog(ERROR, "unrecognized RTE type: %d", |
2927 | 0 | (int) rte->rtekind); |
2928 | 0 | break; |
2929 | 1.82k | } |
2930 | 1.82k | break; /* out of foreach loop */ |
2931 | 1.82k | } |
2932 | 1.89k | } |
2933 | 1.82k | if (rt == NULL) |
2934 | 1.82k | ereport(ERROR, |
2935 | 1.82k | (errcode(ERRCODE_UNDEFINED_TABLE), |
2936 | | /*------ |
2937 | | translator: %s is a SQL row locking clause such as FOR UPDATE */ |
2938 | 1.82k | errmsg("relation \"%s\" in %s clause not found in FROM clause", |
2939 | 1.82k | thisrel->relname, |
2940 | 1.82k | LCS_asString(lc->strength)), |
2941 | 1.82k | parser_errposition(pstate, thisrel->location))); |
2942 | 1.82k | } |
2943 | 1.83k | } |
2944 | 4.64k | } |
2945 | | |
2946 | | /* |
2947 | | * Record locking info for a single rangetable item |
2948 | | */ |
2949 | | void |
2950 | | applyLockingClause(Query *qry, Index rtindex, |
2951 | | LockClauseStrength strength, LockWaitPolicy waitPolicy, |
2952 | | bool pushedDown) |
2953 | 4.64k | { |
2954 | 4.64k | RowMarkClause *rc; |
2955 | | |
2956 | 4.64k | Assert(strength != LCS_NONE); /* else caller error */ |
2957 | | |
2958 | | /* If it's an explicit clause, make sure hasForUpdate gets set */ |
2959 | 4.64k | if (!pushedDown) |
2960 | 4.64k | qry->hasForUpdate = true; |
2961 | | |
2962 | | /* Check for pre-existing entry for same rtindex */ |
2963 | 4.64k | if ((rc = get_parse_rowmark(qry, rtindex)) != NULL) |
2964 | 0 | { |
2965 | | /* |
2966 | | * If the same RTE is specified with more than one locking strength, |
2967 | | * use the strongest. (Reasonable, since you can't take both a shared |
2968 | | * and exclusive lock at the same time; it'll end up being exclusive |
2969 | | * anyway.) |
2970 | | * |
2971 | | * Similarly, if the same RTE is specified with more than one lock |
2972 | | * wait policy, consider that NOWAIT wins over SKIP LOCKED, which in |
2973 | | * turn wins over waiting for the lock (the default). This is a bit |
2974 | | * more debatable but raising an error doesn't seem helpful. (Consider |
2975 | | * for instance SELECT FOR UPDATE NOWAIT from a view that internally |
2976 | | * contains a plain FOR UPDATE spec.) Having NOWAIT win over SKIP |
2977 | | * LOCKED is reasonable since the former throws an error in case of |
2978 | | * coming across a locked tuple, which may be undesirable in some |
2979 | | * cases but it seems better than silently returning inconsistent |
2980 | | * results. |
2981 | | * |
2982 | | * And of course pushedDown becomes false if any clause is explicit. |
2983 | | */ |
2984 | 0 | rc->strength = Max(rc->strength, strength); |
2985 | 0 | rc->waitPolicy = Max(rc->waitPolicy, waitPolicy); |
2986 | 0 | rc->pushedDown &= pushedDown; |
2987 | 0 | return; |
2988 | 0 | } |
2989 | | |
2990 | | /* Make a new RowMarkClause */ |
2991 | 4.64k | rc = makeNode(RowMarkClause); |
2992 | 0 | rc->rti = rtindex; |
2993 | 4.64k | rc->strength = strength; |
2994 | 4.64k | rc->waitPolicy = waitPolicy; |
2995 | 4.64k | rc->pushedDown = pushedDown; |
2996 | 4.64k | qry->rowMarks = lappend(qry->rowMarks, rc); |
2997 | 4.64k | } |
2998 | | |
2999 | | /* |
3000 | | * Coverage testing for raw_expression_tree_walker(). |
3001 | | * |
3002 | | * When enabled, we run raw_expression_tree_walker() over every DML statement |
3003 | | * submitted to parse analysis. Without this provision, that function is only |
3004 | | * applied in limited cases involving CTEs, and we don't really want to have |
3005 | | * to test everything inside as well as outside a CTE. |
3006 | | */ |
3007 | | #ifdef RAW_EXPRESSION_COVERAGE_TEST |
3008 | | |
3009 | | static bool |
3010 | | test_raw_expression_coverage(Node *node, void *context) |
3011 | | { |
3012 | | if (node == NULL) |
3013 | | return false; |
3014 | | return raw_expression_tree_walker(node, |
3015 | | test_raw_expression_coverage, |
3016 | | context); |
3017 | | } |
3018 | | |
3019 | | #endif /* RAW_EXPRESSION_COVERAGE_TEST */ |