Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * inherit.c
4 : * Routines to process child relations in inheritance trees
5 : *
6 : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/optimizer/util/inherit.c
12 : *
13 : *-------------------------------------------------------------------------
14 : */
15 : #include "postgres.h"
16 :
17 : #include "access/sysattr.h"
18 : #include "access/table.h"
19 : #include "catalog/partition.h"
20 : #include "catalog/pg_inherits.h"
21 : #include "catalog/pg_type.h"
22 : #include "miscadmin.h"
23 : #include "nodes/makefuncs.h"
24 : #include "optimizer/appendinfo.h"
25 : #include "optimizer/inherit.h"
26 : #include "optimizer/optimizer.h"
27 : #include "optimizer/pathnode.h"
28 : #include "optimizer/plancat.h"
29 : #include "optimizer/planmain.h"
30 : #include "optimizer/planner.h"
31 : #include "optimizer/prep.h"
32 : #include "optimizer/restrictinfo.h"
33 : #include "parser/parsetree.h"
34 : #include "parser/parse_relation.h"
35 : #include "partitioning/partdesc.h"
36 : #include "partitioning/partprune.h"
37 : #include "utils/rel.h"
38 :
39 :
40 : static void expand_partitioned_rtentry(PlannerInfo *root, RelOptInfo *relinfo,
41 : RangeTblEntry *parentrte,
42 : Index parentRTindex, Relation parentrel,
43 : Bitmapset *parent_updatedCols,
44 : PlanRowMark *top_parentrc, LOCKMODE lockmode);
45 : static void expand_single_inheritance_child(PlannerInfo *root,
46 : RangeTblEntry *parentrte,
47 : Index parentRTindex, Relation parentrel,
48 : PlanRowMark *top_parentrc, Relation childrel,
49 : RangeTblEntry **childrte_p,
50 : Index *childRTindex_p);
51 : static Bitmapset *translate_col_privs(const Bitmapset *parent_privs,
52 : List *translated_vars);
53 : static Bitmapset *translate_col_privs_multilevel(PlannerInfo *root,
54 : RelOptInfo *rel,
55 : RelOptInfo *parent_rel,
56 : Bitmapset *parent_cols);
57 : static void expand_appendrel_subquery(PlannerInfo *root, RelOptInfo *rel,
58 : RangeTblEntry *rte, Index rti);
59 :
60 :
61 : /*
62 : * expand_inherited_rtentry
63 : * Expand a rangetable entry that has the "inh" bit set.
64 : *
65 : * "inh" is only allowed in two cases: RELATION and SUBQUERY RTEs.
66 : *
67 : * "inh" on a plain RELATION RTE means that it is a partitioned table or the
68 : * parent of a traditional-inheritance set. In this case we must add entries
69 : * for all the interesting child tables to the query's rangetable, and build
70 : * additional planner data structures for them, including RelOptInfos,
71 : * AppendRelInfos, and possibly PlanRowMarks.
72 : *
73 : * Note that the original RTE is considered to represent the whole inheritance
74 : * set. In the case of traditional inheritance, the first of the generated
75 : * RTEs is an RTE for the same table, but with inh = false, to represent the
76 : * parent table in its role as a simple member of the inheritance set. For
77 : * partitioning, we don't need a second RTE because the partitioned table
78 : * itself has no data and need not be scanned.
79 : *
80 : * "inh" on a SUBQUERY RTE means that it's the parent of a UNION ALL group,
81 : * which is treated as an appendrel similarly to inheritance cases; however,
82 : * we already made RTEs and AppendRelInfos for the subqueries. We only need
83 : * to build RelOptInfos for them, which is done by expand_appendrel_subquery.
84 : */
85 : void
86 11397 : expand_inherited_rtentry(PlannerInfo *root, RelOptInfo *rel,
87 : RangeTblEntry *rte, Index rti)
88 : {
89 : Oid parentOID;
90 : Relation oldrelation;
91 : LOCKMODE lockmode;
92 : PlanRowMark *oldrc;
93 11397 : bool old_isParent = false;
94 11397 : int old_allMarkTypes = 0;
95 :
96 : Assert(rte->inh); /* else caller error */
97 :
98 11397 : if (rte->rtekind == RTE_SUBQUERY)
99 : {
100 2755 : expand_appendrel_subquery(root, rel, rte, rti);
101 2755 : return;
102 : }
103 :
104 : Assert(rte->rtekind == RTE_RELATION);
105 :
106 8642 : parentOID = rte->relid;
107 :
108 : /*
109 : * We used to check has_subclass() here, but there's no longer any need
110 : * to, because subquery_planner already did.
111 : */
112 :
113 : /*
114 : * The rewriter should already have obtained an appropriate lock on each
115 : * relation named in the query, so we can open the parent relation without
116 : * locking it. However, for each child relation we add to the query, we
117 : * must obtain an appropriate lock, because this will be the first use of
118 : * those relations in the parse/rewrite/plan pipeline. Child rels should
119 : * use the same lockmode as their parent.
120 : */
121 8642 : oldrelation = table_open(parentOID, NoLock);
122 8642 : lockmode = rte->rellockmode;
123 :
124 : /*
125 : * If parent relation is selected FOR UPDATE/SHARE, we need to mark its
126 : * PlanRowMark as isParent = true, and generate a new PlanRowMark for each
127 : * child.
128 : */
129 8642 : oldrc = get_plan_rowmark(root->rowMarks, rti);
130 8642 : if (oldrc)
131 : {
132 844 : old_isParent = oldrc->isParent;
133 844 : oldrc->isParent = true;
134 : /* Save initial value of allMarkTypes before children add to it */
135 844 : old_allMarkTypes = oldrc->allMarkTypes;
136 : }
137 :
138 : /* Scan the inheritance set and expand it */
139 8642 : if (oldrelation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
140 : {
141 : RTEPermissionInfo *perminfo;
142 :
143 7237 : perminfo = getRTEPermissionInfo(root->parse->rteperminfos, rte);
144 :
145 : /*
146 : * Partitioned table, so set up for partitioning.
147 : */
148 : Assert(rte->relkind == RELKIND_PARTITIONED_TABLE);
149 :
150 : /*
151 : * Recursively expand and lock the partitions. While at it, also
152 : * extract the partition key columns of all the partitioned tables.
153 : */
154 7237 : expand_partitioned_rtentry(root, rel, rte, rti,
155 : oldrelation,
156 : perminfo->updatedCols,
157 : oldrc, lockmode);
158 : }
159 : else
160 : {
161 : /*
162 : * Ordinary table, so process traditional-inheritance children. (Note
163 : * that partitioned tables are not allowed to have inheritance
164 : * children, so it's not possible for both cases to apply.)
165 : */
166 : List *inhOIDs;
167 : ListCell *l;
168 :
169 : /* Scan for all members of inheritance set, acquire needed locks */
170 1405 : inhOIDs = find_all_inheritors(parentOID, lockmode, NULL);
171 :
172 : /*
173 : * We used to special-case the situation where the table no longer has
174 : * any children, by clearing rte->inh and exiting. That no longer
175 : * works, because this function doesn't get run until after decisions
176 : * have been made that depend on rte->inh. We have to treat such
177 : * situations as normal inheritance. The table itself should always
178 : * have been found, though.
179 : */
180 : Assert(inhOIDs != NIL);
181 : Assert(linitial_oid(inhOIDs) == parentOID);
182 :
183 : /* Expand simple_rel_array and friends to hold child objects. */
184 1405 : expand_planner_arrays(root, list_length(inhOIDs));
185 :
186 : /*
187 : * Expand inheritance children in the order the OIDs were returned by
188 : * find_all_inheritors.
189 : */
190 5073 : foreach(l, inhOIDs)
191 : {
192 3669 : Oid childOID = lfirst_oid(l);
193 : Relation newrelation;
194 : RangeTblEntry *childrte;
195 : Index childRTindex;
196 :
197 : /* Open rel if needed; we already have required locks */
198 3669 : if (childOID != parentOID)
199 2264 : newrelation = table_open(childOID, NoLock);
200 : else
201 1405 : newrelation = oldrelation;
202 :
203 : /*
204 : * It is possible that the parent table has children that are temp
205 : * tables of other backends. We cannot safely access such tables
206 : * (because of buffering issues), and the best thing to do seems
207 : * to be to silently ignore them.
208 : */
209 3669 : if (childOID != parentOID && RELATION_IS_OTHER_TEMP(newrelation))
210 : {
211 21 : table_close(newrelation, lockmode);
212 21 : continue;
213 : }
214 :
215 : /* Create RTE and AppendRelInfo, plus PlanRowMark if needed. */
216 3648 : expand_single_inheritance_child(root, rte, rti, oldrelation,
217 : oldrc, newrelation,
218 : &childrte, &childRTindex);
219 :
220 : /* Create the otherrel RelOptInfo too. */
221 3647 : (void) build_simple_rel(root, childRTindex, rel);
222 :
223 : /* Close child relations, but keep locks */
224 3647 : if (childOID != parentOID)
225 2242 : table_close(newrelation, NoLock);
226 : }
227 : }
228 :
229 : /*
230 : * Some children might require different mark types, which would've been
231 : * reported into oldrc. If so, add relevant entries to the top-level
232 : * targetlist and update parent rel's reltarget. This should match what
233 : * preprocess_targetlist() would have added if the mark types had been
234 : * requested originally.
235 : *
236 : * (Someday it might be useful to fold these resjunk columns into the
237 : * row-identity-column management used for UPDATE/DELETE. Today is not
238 : * that day, however.)
239 : */
240 8641 : if (oldrc)
241 : {
242 844 : int new_allMarkTypes = oldrc->allMarkTypes;
243 : Var *var;
244 : TargetEntry *tle;
245 : char resname[32];
246 844 : List *newvars = NIL;
247 :
248 : /* Add TID junk Var if needed, unless we had it already */
249 844 : if (new_allMarkTypes & ~(1 << ROW_MARK_COPY) &&
250 842 : !(old_allMarkTypes & ~(1 << ROW_MARK_COPY)))
251 : {
252 : /* Need to fetch TID */
253 2 : var = makeVar(oldrc->rti,
254 : SelfItemPointerAttributeNumber,
255 : TIDOID,
256 : -1,
257 : InvalidOid,
258 : 0);
259 2 : snprintf(resname, sizeof(resname), "ctid%u", oldrc->rowmarkId);
260 2 : tle = makeTargetEntry((Expr *) var,
261 2 : list_length(root->processed_tlist) + 1,
262 : pstrdup(resname),
263 : true);
264 2 : root->processed_tlist = lappend(root->processed_tlist, tle);
265 2 : newvars = lappend(newvars, var);
266 : }
267 :
268 : /* Add whole-row junk Var if needed, unless we had it already */
269 844 : if ((new_allMarkTypes & (1 << ROW_MARK_COPY)) &&
270 23 : !(old_allMarkTypes & (1 << ROW_MARK_COPY)))
271 : {
272 19 : var = makeWholeRowVar(planner_rt_fetch(oldrc->rti, root),
273 19 : oldrc->rti,
274 : 0,
275 : false);
276 19 : snprintf(resname, sizeof(resname), "wholerow%u", oldrc->rowmarkId);
277 19 : tle = makeTargetEntry((Expr *) var,
278 19 : list_length(root->processed_tlist) + 1,
279 : pstrdup(resname),
280 : true);
281 19 : root->processed_tlist = lappend(root->processed_tlist, tle);
282 19 : newvars = lappend(newvars, var);
283 : }
284 :
285 : /* Add tableoid junk Var, unless we had it already */
286 844 : if (!old_isParent)
287 : {
288 844 : var = makeVar(oldrc->rti,
289 : TableOidAttributeNumber,
290 : OIDOID,
291 : -1,
292 : InvalidOid,
293 : 0);
294 844 : snprintf(resname, sizeof(resname), "tableoid%u", oldrc->rowmarkId);
295 844 : tle = makeTargetEntry((Expr *) var,
296 844 : list_length(root->processed_tlist) + 1,
297 : pstrdup(resname),
298 : true);
299 844 : root->processed_tlist = lappend(root->processed_tlist, tle);
300 844 : newvars = lappend(newvars, var);
301 : }
302 :
303 : /*
304 : * Add the newly added Vars to parent's reltarget. We needn't worry
305 : * about the children's reltargets, they'll be made later.
306 : */
307 844 : add_vars_to_targetlist(root, newvars, bms_make_singleton(0));
308 : }
309 :
310 8641 : table_close(oldrelation, NoLock);
311 : }
312 :
313 : /*
314 : * expand_partitioned_rtentry
315 : * Recursively expand an RTE for a partitioned table.
316 : */
317 : static void
318 9044 : expand_partitioned_rtentry(PlannerInfo *root, RelOptInfo *relinfo,
319 : RangeTblEntry *parentrte,
320 : Index parentRTindex, Relation parentrel,
321 : Bitmapset *parent_updatedCols,
322 : PlanRowMark *top_parentrc, LOCKMODE lockmode)
323 : {
324 : PartitionDesc partdesc;
325 : int num_live_parts;
326 : int i;
327 :
328 9044 : check_stack_depth();
329 :
330 : Assert(parentrte->inh);
331 :
332 9044 : partdesc = PartitionDirectoryLookup(root->glob->partition_directory,
333 : parentrel);
334 :
335 : /* A partitioned table should always have a partition descriptor. */
336 : Assert(partdesc);
337 :
338 : /* Nothing further to do here if there are no partitions. */
339 9044 : if (partdesc->nparts == 0)
340 21 : return;
341 :
342 : /*
343 : * Perform partition pruning using restriction clauses assigned to parent
344 : * relation. live_parts will contain PartitionDesc indexes of partitions
345 : * that survive pruning. Below, we will initialize child objects for the
346 : * surviving partitions.
347 : */
348 9023 : relinfo->live_parts = prune_append_rel_partitions(relinfo);
349 :
350 : /* Expand simple_rel_array and friends to hold child objects. */
351 9023 : num_live_parts = bms_num_members(relinfo->live_parts);
352 9023 : if (num_live_parts > 0)
353 8873 : expand_planner_arrays(root, num_live_parts);
354 :
355 : /*
356 : * We also store partition RelOptInfo pointers in the parent relation.
357 : * Since we're palloc0'ing, slots corresponding to pruned partitions will
358 : * contain NULL.
359 : */
360 : Assert(relinfo->part_rels == NULL);
361 9023 : relinfo->part_rels = (RelOptInfo **)
362 9023 : palloc0(relinfo->nparts * sizeof(RelOptInfo *));
363 :
364 : /*
365 : * Create a child RTE for each live partition. Note that unlike
366 : * traditional inheritance, we don't need a child RTE for the partitioned
367 : * table itself, because it's not going to be scanned.
368 : */
369 9023 : i = -1;
370 27093 : while ((i = bms_next_member(relinfo->live_parts, i)) >= 0)
371 : {
372 18070 : Oid childOID = partdesc->oids[i];
373 : Relation childrel;
374 : RangeTblEntry *childrte;
375 : Index childRTindex;
376 : RelOptInfo *childrelinfo;
377 :
378 : /*
379 : * Open rel, acquiring required locks. If a partition was recently
380 : * detached and subsequently dropped, then opening it will fail. In
381 : * this case, behave as though the partition had been pruned.
382 : */
383 18070 : childrel = try_table_open(childOID, lockmode);
384 18070 : if (childrel == NULL)
385 : {
386 0 : relinfo->live_parts = bms_del_member(relinfo->live_parts, i);
387 0 : continue;
388 : }
389 :
390 : /*
391 : * Temporary partitions belonging to other sessions should have been
392 : * disallowed at definition, but for paranoia's sake, let's double
393 : * check.
394 : */
395 18070 : if (RELATION_IS_OTHER_TEMP(childrel))
396 0 : elog(ERROR, "temporary relation from another session found as partition");
397 :
398 : /* Create RTE and AppendRelInfo, plus PlanRowMark if needed. */
399 18070 : expand_single_inheritance_child(root, parentrte, parentRTindex,
400 : parentrel, top_parentrc, childrel,
401 : &childrte, &childRTindex);
402 :
403 : /* Create the otherrel RelOptInfo too. */
404 18070 : childrelinfo = build_simple_rel(root, childRTindex, relinfo);
405 18070 : relinfo->part_rels[i] = childrelinfo;
406 36140 : relinfo->all_partrels = bms_add_members(relinfo->all_partrels,
407 18070 : childrelinfo->relids);
408 :
409 : /* If this child is itself partitioned, recurse */
410 18070 : if (childrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
411 : {
412 1807 : AppendRelInfo *appinfo = root->append_rel_array[childRTindex];
413 : Bitmapset *child_updatedCols;
414 :
415 1807 : child_updatedCols = translate_col_privs(parent_updatedCols,
416 : appinfo->translated_vars);
417 :
418 1807 : expand_partitioned_rtentry(root, childrelinfo,
419 : childrte, childRTindex,
420 : childrel,
421 : child_updatedCols,
422 : top_parentrc, lockmode);
423 : }
424 :
425 : /* Close child relation, but keep locks */
426 18070 : table_close(childrel, NoLock);
427 : }
428 : }
429 :
430 : /*
431 : * expand_single_inheritance_child
432 : * Build a RangeTblEntry and an AppendRelInfo, plus maybe a PlanRowMark.
433 : *
434 : * We now expand the partition hierarchy level by level, creating a
435 : * corresponding hierarchy of AppendRelInfos and RelOptInfos, where each
436 : * partitioned descendant acts as a parent of its immediate partitions.
437 : * (This is a difference from what older versions of PostgreSQL did and what
438 : * is still done in the case of table inheritance for unpartitioned tables,
439 : * where the hierarchy is flattened during RTE expansion.)
440 : *
441 : * PlanRowMarks still carry the top-parent's RTI, and the top-parent's
442 : * allMarkTypes field still accumulates values from all descendents.
443 : *
444 : * "parentrte" and "parentRTindex" are immediate parent's RTE and
445 : * RTI. "top_parentrc" is top parent's PlanRowMark.
446 : *
447 : * The child RangeTblEntry and its RTI are returned in "childrte_p" and
448 : * "childRTindex_p" resp.
449 : */
450 : static void
451 21718 : expand_single_inheritance_child(PlannerInfo *root, RangeTblEntry *parentrte,
452 : Index parentRTindex, Relation parentrel,
453 : PlanRowMark *top_parentrc, Relation childrel,
454 : RangeTblEntry **childrte_p,
455 : Index *childRTindex_p)
456 : {
457 21718 : Query *parse = root->parse;
458 21718 : Oid parentOID = RelationGetRelid(parentrel);
459 21718 : Oid childOID = RelationGetRelid(childrel);
460 : RangeTblEntry *childrte;
461 : Index childRTindex;
462 : AppendRelInfo *appinfo;
463 : TupleDesc child_tupdesc;
464 : List *parent_colnames;
465 : List *child_colnames;
466 :
467 : /*
468 : * Build an RTE for the child, and attach to query's rangetable list. We
469 : * copy most scalar fields of the parent's RTE, but replace relation OID,
470 : * relkind, and inh for the child. Set the child's securityQuals to
471 : * empty, because we only want to apply the parent's RLS conditions
472 : * regardless of what RLS properties individual children may have. (This
473 : * is an intentional choice to make inherited RLS work like regular
474 : * permissions checks.) The parent securityQuals will be propagated to
475 : * children along with other base restriction clauses, so we don't need to
476 : * do it here. Other infrastructure of the parent RTE has to be
477 : * translated to match the child table's column ordering, which we do
478 : * below, so a "flat" copy is sufficient to start with.
479 : */
480 21718 : childrte = makeNode(RangeTblEntry);
481 21718 : memcpy(childrte, parentrte, sizeof(RangeTblEntry));
482 : Assert(parentrte->rtekind == RTE_RELATION); /* else this is dubious */
483 21718 : childrte->relid = childOID;
484 21718 : childrte->relkind = childrel->rd_rel->relkind;
485 : /* A partitioned child will need to be expanded further. */
486 21718 : if (childrte->relkind == RELKIND_PARTITIONED_TABLE)
487 : {
488 : Assert(childOID != parentOID);
489 1807 : childrte->inh = true;
490 : }
491 : else
492 19911 : childrte->inh = false;
493 21718 : childrte->securityQuals = NIL;
494 :
495 : /* No permission checking for child RTEs. */
496 21718 : childrte->perminfoindex = 0;
497 :
498 : /* Link not-yet-fully-filled child RTE into data structures */
499 21718 : parse->rtable = lappend(parse->rtable, childrte);
500 21718 : childRTindex = list_length(parse->rtable);
501 21718 : *childrte_p = childrte;
502 21718 : *childRTindex_p = childRTindex;
503 :
504 : /*
505 : * Retrieve column not-null constraint information for the child relation
506 : * if its relation OID is different from the parent's.
507 : */
508 21718 : if (childOID != parentOID)
509 20313 : get_relation_notnullatts(root, childrel);
510 :
511 : /*
512 : * Build an AppendRelInfo struct for each parent/child pair.
513 : */
514 21718 : appinfo = make_append_rel_info(parentrel, childrel,
515 : parentRTindex, childRTindex);
516 21717 : root->append_rel_list = lappend(root->append_rel_list, appinfo);
517 :
518 : /* tablesample is probably null, but copy it */
519 21717 : childrte->tablesample = copyObject(parentrte->tablesample);
520 :
521 : /*
522 : * Construct an alias clause for the child, which we can also use as eref.
523 : * This is important so that EXPLAIN will print the right column aliases
524 : * for child-table columns. (Since ruleutils.c doesn't have any easy way
525 : * to reassociate parent and child columns, we must get the child column
526 : * aliases right to start with. Note that setting childrte->alias forces
527 : * ruleutils.c to use these column names, which it otherwise would not.)
528 : */
529 21717 : child_tupdesc = RelationGetDescr(childrel);
530 21717 : parent_colnames = parentrte->eref->colnames;
531 21717 : child_colnames = NIL;
532 82155 : for (int cattno = 0; cattno < child_tupdesc->natts; cattno++)
533 : {
534 60438 : Form_pg_attribute att = TupleDescAttr(child_tupdesc, cattno);
535 : const char *attname;
536 :
537 60438 : if (att->attisdropped)
538 : {
539 : /* Always insert an empty string for a dropped column */
540 1193 : attname = "";
541 : }
542 116537 : else if (appinfo->parent_colnos[cattno] > 0 &&
543 57292 : appinfo->parent_colnos[cattno] <= list_length(parent_colnames))
544 : {
545 : /* Duplicate the query-assigned name for the parent column */
546 57292 : attname = strVal(list_nth(parent_colnames,
547 : appinfo->parent_colnos[cattno] - 1));
548 : }
549 : else
550 : {
551 : /* New column, just use its real name */
552 1953 : attname = NameStr(att->attname);
553 : }
554 60438 : child_colnames = lappend(child_colnames, makeString(pstrdup(attname)));
555 : }
556 :
557 : /*
558 : * We just duplicate the parent's table alias name for each child. If the
559 : * plan gets printed, ruleutils.c has to sort out unique table aliases to
560 : * use, which it can handle.
561 : */
562 21717 : childrte->alias = childrte->eref = makeAlias(parentrte->eref->aliasname,
563 : child_colnames);
564 :
565 : /*
566 : * Store the RTE and appinfo in the respective PlannerInfo arrays, which
567 : * the caller must already have allocated space for.
568 : */
569 : Assert(childRTindex < root->simple_rel_array_size);
570 : Assert(root->simple_rte_array[childRTindex] == NULL);
571 21717 : root->simple_rte_array[childRTindex] = childrte;
572 : Assert(root->append_rel_array[childRTindex] == NULL);
573 21717 : root->append_rel_array[childRTindex] = appinfo;
574 :
575 : /*
576 : * Build a PlanRowMark if parent is marked FOR UPDATE/SHARE.
577 : */
578 21717 : if (top_parentrc)
579 : {
580 1208 : PlanRowMark *childrc = makeNode(PlanRowMark);
581 :
582 1208 : childrc->rti = childRTindex;
583 1208 : childrc->prti = top_parentrc->rti;
584 1208 : childrc->rowmarkId = top_parentrc->rowmarkId;
585 : /* Reselect rowmark type, because relkind might not match parent */
586 1208 : childrc->markType = select_rowmark_type(childrte,
587 : top_parentrc->strength);
588 1208 : childrc->allMarkTypes = (1 << childrc->markType);
589 1208 : childrc->strength = top_parentrc->strength;
590 1208 : childrc->waitPolicy = top_parentrc->waitPolicy;
591 :
592 : /*
593 : * We mark RowMarks for partitioned child tables as parent RowMarks so
594 : * that the executor ignores them (except their existence means that
595 : * the child tables will be locked using the appropriate mode).
596 : */
597 1208 : childrc->isParent = (childrte->relkind == RELKIND_PARTITIONED_TABLE);
598 :
599 : /* Include child's rowmark type in top parent's allMarkTypes */
600 1208 : top_parentrc->allMarkTypes |= childrc->allMarkTypes;
601 :
602 1208 : root->rowMarks = lappend(root->rowMarks, childrc);
603 : }
604 :
605 : /*
606 : * If we are creating a child of the query target relation (only possible
607 : * in UPDATE/DELETE/MERGE), add it to all_result_relids, as well as
608 : * leaf_result_relids if appropriate, and make sure that we generate
609 : * required row-identity data.
610 : */
611 21717 : if (bms_is_member(parentRTindex, root->all_result_relids))
612 : {
613 : /* OK, record the child as a result rel too. */
614 3064 : root->all_result_relids = bms_add_member(root->all_result_relids,
615 : childRTindex);
616 :
617 : /* Non-leaf partitions don't need any row identity info. */
618 3064 : if (childrte->relkind != RELKIND_PARTITIONED_TABLE)
619 : {
620 : Var *rrvar;
621 :
622 2779 : root->leaf_result_relids = bms_add_member(root->leaf_result_relids,
623 : childRTindex);
624 :
625 : /*
626 : * If we have any child target relations, assume they all need to
627 : * generate a junk "tableoid" column. (If only one child survives
628 : * pruning, we wouldn't really need this, but it's not worth
629 : * thrashing about to avoid it.)
630 : */
631 2779 : rrvar = makeVar(childRTindex,
632 : TableOidAttributeNumber,
633 : OIDOID,
634 : -1,
635 : InvalidOid,
636 : 0);
637 2779 : add_row_identity_var(root, rrvar, childRTindex, "tableoid");
638 :
639 : /* Register any row-identity columns needed by this child. */
640 2779 : add_row_identity_columns(root, childRTindex,
641 : childrte, childrel);
642 : }
643 : }
644 21717 : }
645 :
646 : /*
647 : * get_rel_all_updated_cols
648 : * Returns the set of columns of a given "simple" relation that are
649 : * updated by this query.
650 : */
651 : Bitmapset *
652 45 : get_rel_all_updated_cols(PlannerInfo *root, RelOptInfo *rel)
653 : {
654 : Index relid;
655 : RangeTblEntry *rte;
656 : RTEPermissionInfo *perminfo;
657 : Bitmapset *updatedCols,
658 : *extraUpdatedCols;
659 :
660 : Assert(root->parse->commandType == CMD_UPDATE);
661 : Assert(IS_SIMPLE_REL(rel));
662 :
663 : /*
664 : * We obtain updatedCols for the query's result relation. Then, if
665 : * necessary, we map it to the column numbers of the relation for which
666 : * they were requested.
667 : */
668 45 : relid = root->parse->resultRelation;
669 45 : rte = planner_rt_fetch(relid, root);
670 45 : perminfo = getRTEPermissionInfo(root->parse->rteperminfos, rte);
671 :
672 45 : updatedCols = perminfo->updatedCols;
673 :
674 45 : if (rel->relid != relid)
675 : {
676 21 : RelOptInfo *top_parent_rel = find_base_rel(root, relid);
677 :
678 : Assert(IS_OTHER_REL(rel));
679 :
680 21 : updatedCols = translate_col_privs_multilevel(root, rel, top_parent_rel,
681 : updatedCols);
682 : }
683 :
684 : /*
685 : * Now we must check to see if there are any generated columns that depend
686 : * on the updatedCols, and add them to the result.
687 : */
688 45 : extraUpdatedCols = get_dependent_generated_columns(root, rel->relid,
689 : updatedCols);
690 :
691 45 : return bms_union(updatedCols, extraUpdatedCols);
692 : }
693 :
694 : /*
695 : * translate_col_privs
696 : * Translate a bitmapset representing per-column privileges from the
697 : * parent rel's attribute numbering to the child's.
698 : *
699 : * The only surprise here is that we don't translate a parent whole-row
700 : * reference into a child whole-row reference. That would mean requiring
701 : * permissions on all child columns, which is overly strict, since the
702 : * query is really only going to reference the inherited columns. Instead
703 : * we set the per-column bits for all inherited columns.
704 : */
705 : static Bitmapset *
706 1830 : translate_col_privs(const Bitmapset *parent_privs,
707 : List *translated_vars)
708 : {
709 1830 : Bitmapset *child_privs = NULL;
710 : bool whole_row;
711 : int attno;
712 : ListCell *lc;
713 :
714 : /* System attributes have the same numbers in all tables */
715 12810 : for (attno = FirstLowInvalidHeapAttributeNumber + 1; attno < 0; attno++)
716 : {
717 10980 : if (bms_is_member(attno - FirstLowInvalidHeapAttributeNumber,
718 : parent_privs))
719 0 : child_privs = bms_add_member(child_privs,
720 : attno - FirstLowInvalidHeapAttributeNumber);
721 : }
722 :
723 : /* Check if parent has whole-row reference */
724 1830 : whole_row = bms_is_member(InvalidAttrNumber - FirstLowInvalidHeapAttributeNumber,
725 : parent_privs);
726 :
727 : /* And now translate the regular user attributes, using the vars list */
728 1830 : attno = InvalidAttrNumber;
729 6513 : foreach(lc, translated_vars)
730 : {
731 4683 : Var *var = lfirst_node(Var, lc);
732 :
733 4683 : attno++;
734 4683 : if (var == NULL) /* ignore dropped columns */
735 66 : continue;
736 9234 : if (whole_row ||
737 4617 : bms_is_member(attno - FirstLowInvalidHeapAttributeNumber,
738 : parent_privs))
739 274 : child_privs = bms_add_member(child_privs,
740 274 : var->varattno - FirstLowInvalidHeapAttributeNumber);
741 : }
742 :
743 1830 : return child_privs;
744 : }
745 :
746 : /*
747 : * translate_col_privs_multilevel
748 : * Recursively translates the column numbers contained in 'parent_cols'
749 : * to the column numbers of a descendant relation given by 'rel'
750 : *
751 : * Note that because this is based on translate_col_privs, it will expand
752 : * a whole-row reference into all inherited columns. This is not an issue
753 : * for current usages, but beware.
754 : */
755 : static Bitmapset *
756 23 : translate_col_privs_multilevel(PlannerInfo *root, RelOptInfo *rel,
757 : RelOptInfo *parent_rel,
758 : Bitmapset *parent_cols)
759 : {
760 : AppendRelInfo *appinfo;
761 :
762 : /* Fast path for easy case. */
763 23 : if (parent_cols == NULL)
764 0 : return NULL;
765 :
766 : /* Recurse if immediate parent is not the top parent. */
767 23 : if (rel->parent != parent_rel)
768 : {
769 2 : if (rel->parent)
770 2 : parent_cols = translate_col_privs_multilevel(root, rel->parent,
771 : parent_rel,
772 : parent_cols);
773 : else
774 0 : elog(ERROR, "rel with relid %u is not a child rel", rel->relid);
775 : }
776 :
777 : /* Now translate for this child. */
778 : Assert(root->append_rel_array != NULL);
779 23 : appinfo = root->append_rel_array[rel->relid];
780 : Assert(appinfo != NULL);
781 :
782 23 : return translate_col_privs(parent_cols, appinfo->translated_vars);
783 : }
784 :
785 : /*
786 : * expand_appendrel_subquery
787 : * Add "other rel" RelOptInfos for the children of an appendrel baserel
788 : *
789 : * "rel" is a subquery relation that has the rte->inh flag set, meaning it
790 : * is a UNION ALL subquery that's been flattened into an appendrel, with
791 : * child subqueries listed in root->append_rel_list. We need to build
792 : * a RelOptInfo for each child relation so that we can plan scans on them.
793 : */
794 : static void
795 2755 : expand_appendrel_subquery(PlannerInfo *root, RelOptInfo *rel,
796 : RangeTblEntry *rte, Index rti)
797 : {
798 : ListCell *l;
799 :
800 11393 : foreach(l, root->append_rel_list)
801 : {
802 8638 : AppendRelInfo *appinfo = (AppendRelInfo *) lfirst(l);
803 8638 : Index childRTindex = appinfo->child_relid;
804 : RangeTblEntry *childrte;
805 : RelOptInfo *childrel;
806 :
807 : /* append_rel_list contains all append rels; ignore others */
808 8638 : if (appinfo->parent_relid != rti)
809 597 : continue;
810 :
811 : /* find the child RTE, which should already exist */
812 : Assert(childRTindex < root->simple_rel_array_size);
813 8041 : childrte = root->simple_rte_array[childRTindex];
814 : Assert(childrte != NULL);
815 :
816 : /* Build the child RelOptInfo. */
817 8041 : childrel = build_simple_rel(root, childRTindex, rel);
818 :
819 : /* Child may itself be an inherited rel, either table or subquery. */
820 8041 : if (childrte->inh)
821 118 : expand_inherited_rtentry(root, childrel, childrte, childRTindex);
822 : }
823 2755 : }
824 :
825 :
826 : /*
827 : * apply_child_basequals
828 : * Populate childrel's base restriction quals from parent rel's quals,
829 : * translating Vars using appinfo and re-checking for quals which are
830 : * constant-TRUE or constant-FALSE when applied to this child relation.
831 : *
832 : * If any of the resulting clauses evaluate to constant false or NULL, we
833 : * return false and don't apply any quals. Caller should mark the relation as
834 : * a dummy rel in this case, since it doesn't need to be scanned. Constant
835 : * true quals are ignored.
836 : */
837 : bool
838 29758 : apply_child_basequals(PlannerInfo *root, RelOptInfo *parentrel,
839 : RelOptInfo *childrel, RangeTblEntry *childRTE,
840 : AppendRelInfo *appinfo)
841 : {
842 : List *childquals;
843 : Index cq_min_security;
844 : ListCell *lc;
845 :
846 : /*
847 : * The child rel's targetlist might contain non-Var expressions, which
848 : * means that substitution into the quals could produce opportunities for
849 : * const-simplification, and perhaps even pseudoconstant quals. Therefore,
850 : * transform each RestrictInfo separately to see if it reduces to a
851 : * constant or pseudoconstant. (We must process them separately to keep
852 : * track of the security level of each qual.)
853 : */
854 29758 : childquals = NIL;
855 29758 : cq_min_security = UINT_MAX;
856 44699 : foreach(lc, parentrel->baserestrictinfo)
857 : {
858 14989 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
859 : Node *childqual;
860 : ListCell *lc2;
861 :
862 : Assert(IsA(rinfo, RestrictInfo));
863 14989 : childqual = adjust_appendrel_attrs(root,
864 14989 : (Node *) rinfo->clause,
865 : 1, &appinfo);
866 14989 : childqual = eval_const_expressions(root, childqual);
867 : /* check for flat-out constant */
868 14989 : if (childqual && IsA(childqual, Const))
869 : {
870 99 : if (((Const *) childqual)->constisnull ||
871 99 : !DatumGetBool(((Const *) childqual)->constvalue))
872 : {
873 : /* Restriction reduces to constant FALSE or NULL */
874 48 : return false;
875 : }
876 : /* Restriction reduces to constant TRUE, so drop it */
877 51 : continue;
878 : }
879 : /* might have gotten an AND clause, if so flatten it */
880 29786 : foreach(lc2, make_ands_implicit((Expr *) childqual))
881 : {
882 14896 : Node *onecq = (Node *) lfirst(lc2);
883 : bool pseudoconstant;
884 : RestrictInfo *childrinfo;
885 :
886 : /* check for pseudoconstant (no Vars or volatile functions) */
887 14896 : pseudoconstant =
888 14919 : !contain_vars_of_level(onecq, 0) &&
889 23 : !contain_volatile_functions(onecq);
890 14896 : if (pseudoconstant)
891 : {
892 : /* tell createplan.c to check for gating quals */
893 23 : root->hasPseudoConstantQuals = true;
894 : }
895 : /* reconstitute RestrictInfo with appropriate properties */
896 14896 : childrinfo = make_restrictinfo(root,
897 : (Expr *) onecq,
898 14896 : rinfo->is_pushed_down,
899 14896 : rinfo->has_clone,
900 14896 : rinfo->is_clone,
901 : pseudoconstant,
902 : rinfo->security_level,
903 : NULL, NULL, NULL);
904 :
905 : /* Restriction is proven always false */
906 14896 : if (restriction_is_always_false(root, childrinfo))
907 0 : return false;
908 : /* Restriction is proven always true, so drop it */
909 14896 : if (restriction_is_always_true(root, childrinfo))
910 0 : continue;
911 :
912 14896 : childquals = lappend(childquals, childrinfo);
913 : /* track minimum security level among child quals */
914 14896 : cq_min_security = Min(cq_min_security, rinfo->security_level);
915 : }
916 : }
917 :
918 : /*
919 : * In addition to the quals inherited from the parent, we might have
920 : * securityQuals associated with this particular child node. (Currently
921 : * this can only happen in appendrels originating from UNION ALL;
922 : * inheritance child tables don't have their own securityQuals, see
923 : * expand_single_inheritance_child().) Pull any such securityQuals up
924 : * into the baserestrictinfo for the child. This is similar to
925 : * process_security_barrier_quals() for the parent rel, except that we
926 : * can't make any general deductions from such quals, since they don't
927 : * hold for the whole appendrel.
928 : */
929 29710 : if (childRTE->securityQuals)
930 : {
931 24 : Index security_level = 0;
932 :
933 48 : foreach(lc, childRTE->securityQuals)
934 : {
935 24 : List *qualset = (List *) lfirst(lc);
936 : ListCell *lc2;
937 :
938 48 : foreach(lc2, qualset)
939 : {
940 24 : Expr *qual = (Expr *) lfirst(lc2);
941 :
942 : /* not likely that we'd see constants here, so no check */
943 24 : childquals = lappend(childquals,
944 24 : make_restrictinfo(root, qual,
945 : true,
946 : false, false,
947 : false,
948 : security_level,
949 : NULL, NULL, NULL));
950 24 : cq_min_security = Min(cq_min_security, security_level);
951 : }
952 24 : security_level++;
953 : }
954 : Assert(security_level <= root->qual_security_level);
955 : }
956 :
957 : /*
958 : * OK, we've got all the baserestrictinfo quals for this child.
959 : */
960 29710 : childrel->baserestrictinfo = childquals;
961 29710 : childrel->baserestrict_min_security = cq_min_security;
962 :
963 29710 : return true;
964 : }
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