Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * inherit.c
4 : * Routines to process child relations in inheritance trees
5 : *
6 : * Portions Copyright (c) 1996-2023, 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 16238 : 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 16238 : bool old_isParent = false;
94 16238 : int old_allMarkTypes = 0;
95 :
96 : Assert(rte->inh); /* else caller error */
97 :
98 16238 : if (rte->rtekind == RTE_SUBQUERY)
99 : {
100 1594 : expand_appendrel_subquery(root, rel, rte, rti);
101 1594 : return;
102 : }
103 :
104 : Assert(rte->rtekind == RTE_RELATION);
105 :
106 14644 : 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 14644 : oldrelation = table_open(parentOID, NoLock);
122 14644 : 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 14644 : oldrc = get_plan_rowmark(root->rowMarks, rti);
130 14644 : if (oldrc)
131 : {
132 1322 : old_isParent = oldrc->isParent;
133 1322 : oldrc->isParent = true;
134 : /* Save initial value of allMarkTypes before children add to it */
135 1322 : old_allMarkTypes = oldrc->allMarkTypes;
136 : }
137 :
138 : /* Scan the inheritance set and expand it */
139 14644 : if (oldrelation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
140 : {
141 : RTEPermissionInfo *perminfo;
142 :
143 12244 : 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 12244 : 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 2400 : 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 2400 : 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 8994 : foreach(l, inhOIDs)
191 : {
192 6596 : 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 6596 : if (childOID != parentOID)
199 4196 : newrelation = table_open(childOID, NoLock);
200 : else
201 2400 : 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 6596 : if (childOID != parentOID && RELATION_IS_OTHER_TEMP(newrelation))
210 : {
211 42 : table_close(newrelation, lockmode);
212 42 : continue;
213 : }
214 :
215 : /* Create RTE and AppendRelInfo, plus PlanRowMark if needed. */
216 6554 : expand_single_inheritance_child(root, rte, rti, oldrelation,
217 : oldrc, newrelation,
218 : &childrte, &childRTindex);
219 :
220 : /* Create the otherrel RelOptInfo too. */
221 6552 : (void) build_simple_rel(root, childRTindex, rel);
222 :
223 : /* Close child relations, but keep locks */
224 6552 : if (childOID != parentOID)
225 4152 : 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 14642 : if (oldrc)
241 : {
242 1322 : int new_allMarkTypes = oldrc->allMarkTypes;
243 : Var *var;
244 : TargetEntry *tle;
245 : char resname[32];
246 1322 : List *newvars = NIL;
247 :
248 : /* Add TID junk Var if needed, unless we had it already */
249 1322 : if (new_allMarkTypes & ~(1 << ROW_MARK_COPY) &&
250 1318 : !(old_allMarkTypes & ~(1 << ROW_MARK_COPY)))
251 : {
252 : /* Need to fetch TID */
253 4 : var = makeVar(oldrc->rti,
254 : SelfItemPointerAttributeNumber,
255 : TIDOID,
256 : -1,
257 : InvalidOid,
258 : 0);
259 4 : snprintf(resname, sizeof(resname), "ctid%u", oldrc->rowmarkId);
260 4 : tle = makeTargetEntry((Expr *) var,
261 4 : list_length(root->processed_tlist) + 1,
262 : pstrdup(resname),
263 : true);
264 4 : root->processed_tlist = lappend(root->processed_tlist, tle);
265 4 : newvars = lappend(newvars, var);
266 : }
267 :
268 : /* Add whole-row junk Var if needed, unless we had it already */
269 1322 : if ((new_allMarkTypes & (1 << ROW_MARK_COPY)) &&
270 46 : !(old_allMarkTypes & (1 << ROW_MARK_COPY)))
271 : {
272 38 : var = makeWholeRowVar(planner_rt_fetch(oldrc->rti, root),
273 38 : oldrc->rti,
274 : 0,
275 : false);
276 38 : snprintf(resname, sizeof(resname), "wholerow%u", oldrc->rowmarkId);
277 38 : tle = makeTargetEntry((Expr *) var,
278 38 : list_length(root->processed_tlist) + 1,
279 : pstrdup(resname),
280 : true);
281 38 : root->processed_tlist = lappend(root->processed_tlist, tle);
282 38 : newvars = lappend(newvars, var);
283 : }
284 :
285 : /* Add tableoid junk Var, unless we had it already */
286 1322 : if (!old_isParent)
287 : {
288 1322 : var = makeVar(oldrc->rti,
289 : TableOidAttributeNumber,
290 : OIDOID,
291 : -1,
292 : InvalidOid,
293 : 0);
294 1322 : snprintf(resname, sizeof(resname), "tableoid%u", oldrc->rowmarkId);
295 1322 : tle = makeTargetEntry((Expr *) var,
296 1322 : list_length(root->processed_tlist) + 1,
297 : pstrdup(resname),
298 : true);
299 1322 : root->processed_tlist = lappend(root->processed_tlist, tle);
300 1322 : 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 1322 : add_vars_to_targetlist(root, newvars, bms_make_singleton(0));
308 : }
309 :
310 14642 : 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 15244 : 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 : Bitmapset *live_parts;
326 : int num_live_parts;
327 : int i;
328 :
329 15244 : check_stack_depth();
330 :
331 : Assert(parentrte->inh);
332 :
333 15244 : partdesc = PartitionDirectoryLookup(root->glob->partition_directory,
334 : parentrel);
335 :
336 : /* A partitioned table should always have a partition descriptor. */
337 : Assert(partdesc);
338 :
339 : /*
340 : * Note down whether any partition key cols are being updated. Though it's
341 : * the root partitioned table's updatedCols we are interested in,
342 : * parent_updatedCols provided by the caller contains the root partrel's
343 : * updatedCols translated to match the attribute ordering of parentrel.
344 : */
345 15244 : if (!root->partColsUpdated)
346 14956 : root->partColsUpdated =
347 14956 : has_partition_attrs(parentrel, parent_updatedCols, NULL);
348 :
349 : /* Nothing further to do here if there are no partitions. */
350 15244 : if (partdesc->nparts == 0)
351 36 : return;
352 :
353 : /*
354 : * Perform partition pruning using restriction clauses assigned to parent
355 : * relation. live_parts will contain PartitionDesc indexes of partitions
356 : * that survive pruning. Below, we will initialize child objects for the
357 : * surviving partitions.
358 : */
359 15208 : relinfo->live_parts = live_parts = prune_append_rel_partitions(relinfo);
360 :
361 : /* Expand simple_rel_array and friends to hold child objects. */
362 15208 : num_live_parts = bms_num_members(live_parts);
363 15208 : if (num_live_parts > 0)
364 14938 : expand_planner_arrays(root, num_live_parts);
365 :
366 : /*
367 : * We also store partition RelOptInfo pointers in the parent relation.
368 : * Since we're palloc0'ing, slots corresponding to pruned partitions will
369 : * contain NULL.
370 : */
371 : Assert(relinfo->part_rels == NULL);
372 15208 : relinfo->part_rels = (RelOptInfo **)
373 15208 : palloc0(relinfo->nparts * sizeof(RelOptInfo *));
374 :
375 : /*
376 : * Create a child RTE for each live partition. Note that unlike
377 : * traditional inheritance, we don't need a child RTE for the partitioned
378 : * table itself, because it's not going to be scanned.
379 : */
380 15208 : i = -1;
381 45148 : while ((i = bms_next_member(live_parts, i)) >= 0)
382 : {
383 29940 : Oid childOID = partdesc->oids[i];
384 : Relation childrel;
385 : RangeTblEntry *childrte;
386 : Index childRTindex;
387 : RelOptInfo *childrelinfo;
388 :
389 : /* Open rel, acquiring required locks */
390 29940 : childrel = table_open(childOID, lockmode);
391 :
392 : /*
393 : * Temporary partitions belonging to other sessions should have been
394 : * disallowed at definition, but for paranoia's sake, let's double
395 : * check.
396 : */
397 29940 : if (RELATION_IS_OTHER_TEMP(childrel))
398 0 : elog(ERROR, "temporary relation from another session found as partition");
399 :
400 : /* Create RTE and AppendRelInfo, plus PlanRowMark if needed. */
401 29940 : expand_single_inheritance_child(root, parentrte, parentRTindex,
402 : parentrel, top_parentrc, childrel,
403 : &childrte, &childRTindex);
404 :
405 : /* Create the otherrel RelOptInfo too. */
406 29940 : childrelinfo = build_simple_rel(root, childRTindex, relinfo);
407 29940 : relinfo->part_rels[i] = childrelinfo;
408 59880 : relinfo->all_partrels = bms_add_members(relinfo->all_partrels,
409 29940 : childrelinfo->relids);
410 :
411 : /* If this child is itself partitioned, recurse */
412 29940 : if (childrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
413 : {
414 3000 : AppendRelInfo *appinfo = root->append_rel_array[childRTindex];
415 : Bitmapset *child_updatedCols;
416 :
417 3000 : child_updatedCols = translate_col_privs(parent_updatedCols,
418 : appinfo->translated_vars);
419 :
420 3000 : expand_partitioned_rtentry(root, childrelinfo,
421 : childrte, childRTindex,
422 : childrel,
423 : child_updatedCols,
424 : top_parentrc, lockmode);
425 : }
426 :
427 : /* Close child relation, but keep locks */
428 29940 : table_close(childrel, NoLock);
429 : }
430 : }
431 :
432 : /*
433 : * expand_single_inheritance_child
434 : * Build a RangeTblEntry and an AppendRelInfo, plus maybe a PlanRowMark.
435 : *
436 : * We now expand the partition hierarchy level by level, creating a
437 : * corresponding hierarchy of AppendRelInfos and RelOptInfos, where each
438 : * partitioned descendant acts as a parent of its immediate partitions.
439 : * (This is a difference from what older versions of PostgreSQL did and what
440 : * is still done in the case of table inheritance for unpartitioned tables,
441 : * where the hierarchy is flattened during RTE expansion.)
442 : *
443 : * PlanRowMarks still carry the top-parent's RTI, and the top-parent's
444 : * allMarkTypes field still accumulates values from all descendents.
445 : *
446 : * "parentrte" and "parentRTindex" are immediate parent's RTE and
447 : * RTI. "top_parentrc" is top parent's PlanRowMark.
448 : *
449 : * The child RangeTblEntry and its RTI are returned in "childrte_p" and
450 : * "childRTindex_p" resp.
451 : */
452 : static void
453 36494 : expand_single_inheritance_child(PlannerInfo *root, RangeTblEntry *parentrte,
454 : Index parentRTindex, Relation parentrel,
455 : PlanRowMark *top_parentrc, Relation childrel,
456 : RangeTblEntry **childrte_p,
457 : Index *childRTindex_p)
458 : {
459 36494 : Query *parse = root->parse;
460 36494 : Oid parentOID PG_USED_FOR_ASSERTS_ONLY =
461 : RelationGetRelid(parentrel);
462 36494 : Oid childOID = RelationGetRelid(childrel);
463 : RangeTblEntry *childrte;
464 : Index childRTindex;
465 : AppendRelInfo *appinfo;
466 : TupleDesc child_tupdesc;
467 : List *parent_colnames;
468 : List *child_colnames;
469 :
470 : /*
471 : * Build an RTE for the child, and attach to query's rangetable list. We
472 : * copy most scalar fields of the parent's RTE, but replace relation OID,
473 : * relkind, and inh for the child. Set the child's securityQuals to
474 : * empty, because we only want to apply the parent's RLS conditions
475 : * regardless of what RLS properties individual children may have. (This
476 : * is an intentional choice to make inherited RLS work like regular
477 : * permissions checks.) The parent securityQuals will be propagated to
478 : * children along with other base restriction clauses, so we don't need to
479 : * do it here. Other infrastructure of the parent RTE has to be
480 : * translated to match the child table's column ordering, which we do
481 : * below, so a "flat" copy is sufficient to start with.
482 : */
483 36494 : childrte = makeNode(RangeTblEntry);
484 36494 : memcpy(childrte, parentrte, sizeof(RangeTblEntry));
485 : Assert(parentrte->rtekind == RTE_RELATION); /* else this is dubious */
486 36494 : childrte->relid = childOID;
487 36494 : childrte->relkind = childrel->rd_rel->relkind;
488 : /* A partitioned child will need to be expanded further. */
489 36494 : if (childrte->relkind == RELKIND_PARTITIONED_TABLE)
490 : {
491 : Assert(childOID != parentOID);
492 3000 : childrte->inh = true;
493 : }
494 : else
495 33494 : childrte->inh = false;
496 36494 : childrte->securityQuals = NIL;
497 :
498 : /* No permission checking for child RTEs. */
499 36494 : childrte->perminfoindex = 0;
500 :
501 : /* Link not-yet-fully-filled child RTE into data structures */
502 36494 : parse->rtable = lappend(parse->rtable, childrte);
503 36494 : childRTindex = list_length(parse->rtable);
504 36494 : *childrte_p = childrte;
505 36494 : *childRTindex_p = childRTindex;
506 :
507 : /*
508 : * Build an AppendRelInfo struct for each parent/child pair.
509 : */
510 36494 : appinfo = make_append_rel_info(parentrel, childrel,
511 : parentRTindex, childRTindex);
512 36492 : root->append_rel_list = lappend(root->append_rel_list, appinfo);
513 :
514 : /* tablesample is probably null, but copy it */
515 36492 : childrte->tablesample = copyObject(parentrte->tablesample);
516 :
517 : /*
518 : * Construct an alias clause for the child, which we can also use as eref.
519 : * This is important so that EXPLAIN will print the right column aliases
520 : * for child-table columns. (Since ruleutils.c doesn't have any easy way
521 : * to reassociate parent and child columns, we must get the child column
522 : * aliases right to start with. Note that setting childrte->alias forces
523 : * ruleutils.c to use these column names, which it otherwise would not.)
524 : */
525 36492 : child_tupdesc = RelationGetDescr(childrel);
526 36492 : parent_colnames = parentrte->eref->colnames;
527 36492 : child_colnames = NIL;
528 139324 : for (int cattno = 0; cattno < child_tupdesc->natts; cattno++)
529 : {
530 102832 : Form_pg_attribute att = TupleDescAttr(child_tupdesc, cattno);
531 : const char *attname;
532 :
533 102832 : if (att->attisdropped)
534 : {
535 : /* Always insert an empty string for a dropped column */
536 2156 : attname = "";
537 : }
538 197482 : else if (appinfo->parent_colnos[cattno] > 0 &&
539 96806 : appinfo->parent_colnos[cattno] <= list_length(parent_colnames))
540 : {
541 : /* Duplicate the query-assigned name for the parent column */
542 96806 : attname = strVal(list_nth(parent_colnames,
543 : appinfo->parent_colnos[cattno] - 1));
544 : }
545 : else
546 : {
547 : /* New column, just use its real name */
548 3870 : attname = NameStr(att->attname);
549 : }
550 102832 : child_colnames = lappend(child_colnames, makeString(pstrdup(attname)));
551 : }
552 :
553 : /*
554 : * We just duplicate the parent's table alias name for each child. If the
555 : * plan gets printed, ruleutils.c has to sort out unique table aliases to
556 : * use, which it can handle.
557 : */
558 36492 : childrte->alias = childrte->eref = makeAlias(parentrte->eref->aliasname,
559 : child_colnames);
560 :
561 : /*
562 : * Store the RTE and appinfo in the respective PlannerInfo arrays, which
563 : * the caller must already have allocated space for.
564 : */
565 : Assert(childRTindex < root->simple_rel_array_size);
566 : Assert(root->simple_rte_array[childRTindex] == NULL);
567 36492 : root->simple_rte_array[childRTindex] = childrte;
568 : Assert(root->append_rel_array[childRTindex] == NULL);
569 36492 : root->append_rel_array[childRTindex] = appinfo;
570 :
571 : /*
572 : * Build a PlanRowMark if parent is marked FOR UPDATE/SHARE.
573 : */
574 36492 : if (top_parentrc)
575 : {
576 1864 : PlanRowMark *childrc = makeNode(PlanRowMark);
577 :
578 1864 : childrc->rti = childRTindex;
579 1864 : childrc->prti = top_parentrc->rti;
580 1864 : childrc->rowmarkId = top_parentrc->rowmarkId;
581 : /* Reselect rowmark type, because relkind might not match parent */
582 1864 : childrc->markType = select_rowmark_type(childrte,
583 : top_parentrc->strength);
584 1864 : childrc->allMarkTypes = (1 << childrc->markType);
585 1864 : childrc->strength = top_parentrc->strength;
586 1864 : childrc->waitPolicy = top_parentrc->waitPolicy;
587 :
588 : /*
589 : * We mark RowMarks for partitioned child tables as parent RowMarks so
590 : * that the executor ignores them (except their existence means that
591 : * the child tables will be locked using the appropriate mode).
592 : */
593 1864 : childrc->isParent = (childrte->relkind == RELKIND_PARTITIONED_TABLE);
594 :
595 : /* Include child's rowmark type in top parent's allMarkTypes */
596 1864 : top_parentrc->allMarkTypes |= childrc->allMarkTypes;
597 :
598 1864 : root->rowMarks = lappend(root->rowMarks, childrc);
599 : }
600 :
601 : /*
602 : * If we are creating a child of the query target relation (only possible
603 : * in UPDATE/DELETE/MERGE), add it to all_result_relids, as well as
604 : * leaf_result_relids if appropriate, and make sure that we generate
605 : * required row-identity data.
606 : */
607 36492 : if (bms_is_member(parentRTindex, root->all_result_relids))
608 : {
609 : /* OK, record the child as a result rel too. */
610 5126 : root->all_result_relids = bms_add_member(root->all_result_relids,
611 : childRTindex);
612 :
613 : /* Non-leaf partitions don't need any row identity info. */
614 5126 : if (childrte->relkind != RELKIND_PARTITIONED_TABLE)
615 : {
616 : Var *rrvar;
617 :
618 4598 : root->leaf_result_relids = bms_add_member(root->leaf_result_relids,
619 : childRTindex);
620 :
621 : /*
622 : * If we have any child target relations, assume they all need to
623 : * generate a junk "tableoid" column. (If only one child survives
624 : * pruning, we wouldn't really need this, but it's not worth
625 : * thrashing about to avoid it.)
626 : */
627 4598 : rrvar = makeVar(childRTindex,
628 : TableOidAttributeNumber,
629 : OIDOID,
630 : -1,
631 : InvalidOid,
632 : 0);
633 4598 : add_row_identity_var(root, rrvar, childRTindex, "tableoid");
634 :
635 : /* Register any row-identity columns needed by this child. */
636 4598 : add_row_identity_columns(root, childRTindex,
637 : childrte, childrel);
638 : }
639 : }
640 36492 : }
641 :
642 : /*
643 : * get_rel_all_updated_cols
644 : * Returns the set of columns of a given "simple" relation that are
645 : * updated by this query.
646 : */
647 : Bitmapset *
648 70 : get_rel_all_updated_cols(PlannerInfo *root, RelOptInfo *rel)
649 : {
650 : Index relid;
651 : RangeTblEntry *rte;
652 : RTEPermissionInfo *perminfo;
653 : Bitmapset *updatedCols,
654 : *extraUpdatedCols;
655 :
656 : Assert(root->parse->commandType == CMD_UPDATE);
657 : Assert(IS_SIMPLE_REL(rel));
658 :
659 : /*
660 : * We obtain updatedCols for the query's result relation. Then, if
661 : * necessary, we map it to the column numbers of the relation for which
662 : * they were requested.
663 : */
664 70 : relid = root->parse->resultRelation;
665 70 : rte = planner_rt_fetch(relid, root);
666 70 : perminfo = getRTEPermissionInfo(root->parse->rteperminfos, rte);
667 :
668 70 : updatedCols = perminfo->updatedCols;
669 :
670 70 : if (rel->relid != relid)
671 : {
672 34 : RelOptInfo *top_parent_rel = find_base_rel(root, relid);
673 :
674 : Assert(IS_OTHER_REL(rel));
675 :
676 34 : updatedCols = translate_col_privs_multilevel(root, rel, top_parent_rel,
677 : updatedCols);
678 : }
679 :
680 : /*
681 : * Now we must check to see if there are any generated columns that depend
682 : * on the updatedCols, and add them to the result.
683 : */
684 70 : extraUpdatedCols = get_dependent_generated_columns(root, rel->relid,
685 : updatedCols);
686 :
687 70 : return bms_union(updatedCols, extraUpdatedCols);
688 : }
689 :
690 : /*
691 : * translate_col_privs
692 : * Translate a bitmapset representing per-column privileges from the
693 : * parent rel's attribute numbering to the child's.
694 : *
695 : * The only surprise here is that we don't translate a parent whole-row
696 : * reference into a child whole-row reference. That would mean requiring
697 : * permissions on all child columns, which is overly strict, since the
698 : * query is really only going to reference the inherited columns. Instead
699 : * we set the per-column bits for all inherited columns.
700 : */
701 : static Bitmapset *
702 3038 : translate_col_privs(const Bitmapset *parent_privs,
703 : List *translated_vars)
704 : {
705 3038 : Bitmapset *child_privs = NULL;
706 : bool whole_row;
707 : int attno;
708 : ListCell *lc;
709 :
710 : /* System attributes have the same numbers in all tables */
711 21266 : for (attno = FirstLowInvalidHeapAttributeNumber + 1; attno < 0; attno++)
712 : {
713 18228 : if (bms_is_member(attno - FirstLowInvalidHeapAttributeNumber,
714 : parent_privs))
715 0 : child_privs = bms_add_member(child_privs,
716 : attno - FirstLowInvalidHeapAttributeNumber);
717 : }
718 :
719 : /* Check if parent has whole-row reference */
720 3038 : whole_row = bms_is_member(InvalidAttrNumber - FirstLowInvalidHeapAttributeNumber,
721 : parent_privs);
722 :
723 : /* And now translate the regular user attributes, using the vars list */
724 3038 : attno = InvalidAttrNumber;
725 10962 : foreach(lc, translated_vars)
726 : {
727 7924 : Var *var = lfirst_node(Var, lc);
728 :
729 7924 : attno++;
730 7924 : if (var == NULL) /* ignore dropped columns */
731 126 : continue;
732 15596 : if (whole_row ||
733 7798 : bms_is_member(attno - FirstLowInvalidHeapAttributeNumber,
734 : parent_privs))
735 522 : child_privs = bms_add_member(child_privs,
736 522 : var->varattno - FirstLowInvalidHeapAttributeNumber);
737 : }
738 :
739 3038 : return child_privs;
740 : }
741 :
742 : /*
743 : * translate_col_privs_multilevel
744 : * Recursively translates the column numbers contained in 'parent_cols'
745 : * to the column numbers of a descendant relation given by 'rel'
746 : *
747 : * Note that because this is based on translate_col_privs, it will expand
748 : * a whole-row reference into all inherited columns. This is not an issue
749 : * for current usages, but beware.
750 : */
751 : static Bitmapset *
752 38 : translate_col_privs_multilevel(PlannerInfo *root, RelOptInfo *rel,
753 : RelOptInfo *parent_rel,
754 : Bitmapset *parent_cols)
755 : {
756 : AppendRelInfo *appinfo;
757 :
758 : /* Fast path for easy case. */
759 38 : if (parent_cols == NULL)
760 0 : return NULL;
761 :
762 : /* Recurse if immediate parent is not the top parent. */
763 38 : if (rel->parent != parent_rel)
764 : {
765 4 : if (rel->parent)
766 4 : parent_cols = translate_col_privs_multilevel(root, rel->parent,
767 : parent_rel,
768 : parent_cols);
769 : else
770 0 : elog(ERROR, "rel with relid %u is not a child rel", rel->relid);
771 : }
772 :
773 : /* Now translate for this child. */
774 : Assert(root->append_rel_array != NULL);
775 38 : appinfo = root->append_rel_array[rel->relid];
776 : Assert(appinfo != NULL);
777 :
778 38 : return translate_col_privs(parent_cols, appinfo->translated_vars);
779 : }
780 :
781 : /*
782 : * expand_appendrel_subquery
783 : * Add "other rel" RelOptInfos for the children of an appendrel baserel
784 : *
785 : * "rel" is a subquery relation that has the rte->inh flag set, meaning it
786 : * is a UNION ALL subquery that's been flattened into an appendrel, with
787 : * child subqueries listed in root->append_rel_list. We need to build
788 : * a RelOptInfo for each child relation so that we can plan scans on them.
789 : */
790 : static void
791 1594 : expand_appendrel_subquery(PlannerInfo *root, RelOptInfo *rel,
792 : RangeTblEntry *rte, Index rti)
793 : {
794 : ListCell *l;
795 :
796 6504 : foreach(l, root->append_rel_list)
797 : {
798 4910 : AppendRelInfo *appinfo = (AppendRelInfo *) lfirst(l);
799 4910 : Index childRTindex = appinfo->child_relid;
800 : RangeTblEntry *childrte;
801 : RelOptInfo *childrel;
802 :
803 : /* append_rel_list contains all append rels; ignore others */
804 4910 : if (appinfo->parent_relid != rti)
805 1146 : continue;
806 :
807 : /* find the child RTE, which should already exist */
808 : Assert(childRTindex < root->simple_rel_array_size);
809 3764 : childrte = root->simple_rte_array[childRTindex];
810 : Assert(childrte != NULL);
811 :
812 : /* Build the child RelOptInfo. */
813 3764 : childrel = build_simple_rel(root, childRTindex, rel);
814 :
815 : /* Child may itself be an inherited rel, either table or subquery. */
816 3764 : if (childrte->inh)
817 212 : expand_inherited_rtentry(root, childrel, childrte, childRTindex);
818 : }
819 1594 : }
820 :
821 :
822 : /*
823 : * apply_child_basequals
824 : * Populate childrel's base restriction quals from parent rel's quals,
825 : * translating them using appinfo.
826 : *
827 : * If any of the resulting clauses evaluate to constant false or NULL, we
828 : * return false and don't apply any quals. Caller should mark the relation as
829 : * a dummy rel in this case, since it doesn't need to be scanned.
830 : */
831 : bool
832 40256 : apply_child_basequals(PlannerInfo *root, RelOptInfo *parentrel,
833 : RelOptInfo *childrel, RangeTblEntry *childRTE,
834 : AppendRelInfo *appinfo)
835 : {
836 : List *childquals;
837 : Index cq_min_security;
838 : ListCell *lc;
839 :
840 : /*
841 : * The child rel's targetlist might contain non-Var expressions, which
842 : * means that substitution into the quals could produce opportunities for
843 : * const-simplification, and perhaps even pseudoconstant quals. Therefore,
844 : * transform each RestrictInfo separately to see if it reduces to a
845 : * constant or pseudoconstant. (We must process them separately to keep
846 : * track of the security level of each qual.)
847 : */
848 40256 : childquals = NIL;
849 40256 : cq_min_security = UINT_MAX;
850 66364 : foreach(lc, parentrel->baserestrictinfo)
851 : {
852 26186 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
853 : Node *childqual;
854 : ListCell *lc2;
855 :
856 : Assert(IsA(rinfo, RestrictInfo));
857 26186 : childqual = adjust_appendrel_attrs(root,
858 26186 : (Node *) rinfo->clause,
859 : 1, &appinfo);
860 26186 : childqual = eval_const_expressions(root, childqual);
861 : /* check for flat-out constant */
862 26186 : if (childqual && IsA(childqual, Const))
863 : {
864 156 : if (((Const *) childqual)->constisnull ||
865 156 : !DatumGetBool(((Const *) childqual)->constvalue))
866 : {
867 : /* Restriction reduces to constant FALSE or NULL */
868 78 : return false;
869 : }
870 : /* Restriction reduces to constant TRUE, so drop it */
871 78 : continue;
872 : }
873 : /* might have gotten an AND clause, if so flatten it */
874 52072 : foreach(lc2, make_ands_implicit((Expr *) childqual))
875 : {
876 26042 : Node *onecq = (Node *) lfirst(lc2);
877 : bool pseudoconstant;
878 :
879 : /* check for pseudoconstant (no Vars or volatile functions) */
880 26042 : pseudoconstant =
881 26088 : !contain_vars_of_level(onecq, 0) &&
882 46 : !contain_volatile_functions(onecq);
883 26042 : if (pseudoconstant)
884 : {
885 : /* tell createplan.c to check for gating quals */
886 46 : root->hasPseudoConstantQuals = true;
887 : }
888 : /* reconstitute RestrictInfo with appropriate properties */
889 26042 : childquals = lappend(childquals,
890 26042 : make_restrictinfo(root,
891 : (Expr *) onecq,
892 26042 : rinfo->is_pushed_down,
893 26042 : rinfo->has_clone,
894 26042 : rinfo->is_clone,
895 : pseudoconstant,
896 : rinfo->security_level,
897 : NULL, NULL, NULL));
898 : /* track minimum security level among child quals */
899 26042 : cq_min_security = Min(cq_min_security, rinfo->security_level);
900 : }
901 : }
902 :
903 : /*
904 : * In addition to the quals inherited from the parent, we might have
905 : * securityQuals associated with this particular child node. (Currently
906 : * this can only happen in appendrels originating from UNION ALL;
907 : * inheritance child tables don't have their own securityQuals, see
908 : * expand_single_inheritance_child().) Pull any such securityQuals up
909 : * into the baserestrictinfo for the child. This is similar to
910 : * process_security_barrier_quals() for the parent rel, except that we
911 : * can't make any general deductions from such quals, since they don't
912 : * hold for the whole appendrel.
913 : */
914 40178 : if (childRTE->securityQuals)
915 : {
916 12 : Index security_level = 0;
917 :
918 24 : foreach(lc, childRTE->securityQuals)
919 : {
920 12 : List *qualset = (List *) lfirst(lc);
921 : ListCell *lc2;
922 :
923 24 : foreach(lc2, qualset)
924 : {
925 12 : Expr *qual = (Expr *) lfirst(lc2);
926 :
927 : /* not likely that we'd see constants here, so no check */
928 12 : childquals = lappend(childquals,
929 12 : make_restrictinfo(root, qual,
930 : true,
931 : false, false,
932 : false,
933 : security_level,
934 : NULL, NULL, NULL));
935 12 : cq_min_security = Min(cq_min_security, security_level);
936 : }
937 12 : security_level++;
938 : }
939 : Assert(security_level <= root->qual_security_level);
940 : }
941 :
942 : /*
943 : * OK, we've got all the baserestrictinfo quals for this child.
944 : */
945 40178 : childrel->baserestrictinfo = childquals;
946 40178 : childrel->baserestrict_min_security = cq_min_security;
947 :
948 40178 : return true;
949 : }
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