Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * relnode.c
4 : * Relation-node lookup/construction routines
5 : *
6 : * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/optimizer/util/relnode.c
12 : *
13 : *-------------------------------------------------------------------------
14 : */
15 : #include "postgres.h"
16 :
17 : #include <limits.h>
18 :
19 : #include "miscadmin.h"
20 : #include "nodes/nodeFuncs.h"
21 : #include "optimizer/appendinfo.h"
22 : #include "optimizer/clauses.h"
23 : #include "optimizer/cost.h"
24 : #include "optimizer/inherit.h"
25 : #include "optimizer/optimizer.h"
26 : #include "optimizer/pathnode.h"
27 : #include "optimizer/paths.h"
28 : #include "optimizer/placeholder.h"
29 : #include "optimizer/plancat.h"
30 : #include "optimizer/restrictinfo.h"
31 : #include "optimizer/tlist.h"
32 : #include "parser/parse_relation.h"
33 : #include "rewrite/rewriteManip.h"
34 : #include "utils/hsearch.h"
35 : #include "utils/lsyscache.h"
36 :
37 :
38 : typedef struct JoinHashEntry
39 : {
40 : Relids join_relids; /* hash key --- MUST BE FIRST */
41 : RelOptInfo *join_rel;
42 : } JoinHashEntry;
43 :
44 : static void build_joinrel_tlist(PlannerInfo *root, RelOptInfo *joinrel,
45 : RelOptInfo *input_rel,
46 : SpecialJoinInfo *sjinfo,
47 : List *pushed_down_joins,
48 : bool can_null);
49 : static List *build_joinrel_restrictlist(PlannerInfo *root,
50 : RelOptInfo *joinrel,
51 : RelOptInfo *outer_rel,
52 : RelOptInfo *inner_rel,
53 : SpecialJoinInfo *sjinfo);
54 : static void build_joinrel_joinlist(RelOptInfo *joinrel,
55 : RelOptInfo *outer_rel,
56 : RelOptInfo *inner_rel);
57 : static List *subbuild_joinrel_restrictlist(PlannerInfo *root,
58 : RelOptInfo *joinrel,
59 : RelOptInfo *input_rel,
60 : Relids both_input_relids,
61 : List *new_restrictlist);
62 : static List *subbuild_joinrel_joinlist(RelOptInfo *joinrel,
63 : List *joininfo_list,
64 : List *new_joininfo);
65 : static void set_foreign_rel_properties(RelOptInfo *joinrel,
66 : RelOptInfo *outer_rel, RelOptInfo *inner_rel);
67 : static void add_join_rel(PlannerInfo *root, RelOptInfo *joinrel);
68 : static void build_joinrel_partition_info(PlannerInfo *root,
69 : RelOptInfo *joinrel,
70 : RelOptInfo *outer_rel, RelOptInfo *inner_rel,
71 : SpecialJoinInfo *sjinfo,
72 : List *restrictlist);
73 : static bool have_partkey_equi_join(PlannerInfo *root, RelOptInfo *joinrel,
74 : RelOptInfo *rel1, RelOptInfo *rel2,
75 : JoinType jointype, List *restrictlist);
76 : static int match_expr_to_partition_keys(Expr *expr, RelOptInfo *rel,
77 : bool strict_op);
78 : static void set_joinrel_partition_key_exprs(RelOptInfo *joinrel,
79 : RelOptInfo *outer_rel, RelOptInfo *inner_rel,
80 : JoinType jointype);
81 : static void build_child_join_reltarget(PlannerInfo *root,
82 : RelOptInfo *parentrel,
83 : RelOptInfo *childrel,
84 : int nappinfos,
85 : AppendRelInfo **appinfos);
86 :
87 :
88 : /*
89 : * setup_simple_rel_arrays
90 : * Prepare the arrays we use for quickly accessing base relations
91 : * and AppendRelInfos.
92 : */
93 : void
94 540754 : setup_simple_rel_arrays(PlannerInfo *root)
95 : {
96 : int size;
97 : Index rti;
98 : ListCell *lc;
99 :
100 : /* Arrays are accessed using RT indexes (1..N) */
101 540754 : size = list_length(root->parse->rtable) + 1;
102 540754 : root->simple_rel_array_size = size;
103 :
104 : /*
105 : * simple_rel_array is initialized to all NULLs, since no RelOptInfos
106 : * exist yet. It'll be filled by later calls to build_simple_rel().
107 : */
108 540754 : root->simple_rel_array = (RelOptInfo **)
109 540754 : palloc0(size * sizeof(RelOptInfo *));
110 :
111 : /* simple_rte_array is an array equivalent of the rtable list */
112 540754 : root->simple_rte_array = (RangeTblEntry **)
113 540754 : palloc0(size * sizeof(RangeTblEntry *));
114 540754 : rti = 1;
115 1415378 : foreach(lc, root->parse->rtable)
116 : {
117 874624 : RangeTblEntry *rte = (RangeTblEntry *) lfirst(lc);
118 :
119 874624 : root->simple_rte_array[rti++] = rte;
120 : }
121 :
122 : /* append_rel_array is not needed if there are no AppendRelInfos */
123 540754 : if (root->append_rel_list == NIL)
124 : {
125 539040 : root->append_rel_array = NULL;
126 539040 : return;
127 : }
128 :
129 1714 : root->append_rel_array = (AppendRelInfo **)
130 1714 : palloc0(size * sizeof(AppendRelInfo *));
131 :
132 : /*
133 : * append_rel_array is filled with any already-existing AppendRelInfos,
134 : * which currently could only come from UNION ALL flattening. We might
135 : * add more later during inheritance expansion, but it's the
136 : * responsibility of the expansion code to update the array properly.
137 : */
138 5926 : foreach(lc, root->append_rel_list)
139 : {
140 4212 : AppendRelInfo *appinfo = lfirst_node(AppendRelInfo, lc);
141 4212 : int child_relid = appinfo->child_relid;
142 :
143 : /* Sanity check */
144 : Assert(child_relid < size);
145 :
146 4212 : if (root->append_rel_array[child_relid])
147 0 : elog(ERROR, "child relation already exists");
148 :
149 4212 : root->append_rel_array[child_relid] = appinfo;
150 : }
151 : }
152 :
153 : /*
154 : * expand_planner_arrays
155 : * Expand the PlannerInfo's per-RTE arrays by add_size members
156 : * and initialize the newly added entries to NULLs
157 : *
158 : * Note: this causes the append_rel_array to become allocated even if
159 : * it was not before. This is okay for current uses, because we only call
160 : * this when adding child relations, which always have AppendRelInfos.
161 : */
162 : void
163 18832 : expand_planner_arrays(PlannerInfo *root, int add_size)
164 : {
165 : int new_size;
166 :
167 : Assert(add_size > 0);
168 :
169 18832 : new_size = root->simple_rel_array_size + add_size;
170 :
171 18832 : root->simple_rel_array =
172 18832 : repalloc0_array(root->simple_rel_array, RelOptInfo *, root->simple_rel_array_size, new_size);
173 :
174 18832 : root->simple_rte_array =
175 18832 : repalloc0_array(root->simple_rte_array, RangeTblEntry *, root->simple_rel_array_size, new_size);
176 :
177 18832 : if (root->append_rel_array)
178 5282 : root->append_rel_array =
179 5282 : repalloc0_array(root->append_rel_array, AppendRelInfo *, root->simple_rel_array_size, new_size);
180 : else
181 13550 : root->append_rel_array =
182 13550 : palloc0_array(AppendRelInfo *, new_size);
183 :
184 18832 : root->simple_rel_array_size = new_size;
185 18832 : }
186 :
187 : /*
188 : * build_simple_rel
189 : * Construct a new RelOptInfo for a base relation or 'other' relation.
190 : */
191 : RelOptInfo *
192 720900 : build_simple_rel(PlannerInfo *root, int relid, RelOptInfo *parent)
193 : {
194 : RelOptInfo *rel;
195 : RangeTblEntry *rte;
196 :
197 : /* Rel should not exist already */
198 : Assert(relid > 0 && relid < root->simple_rel_array_size);
199 720900 : if (root->simple_rel_array[relid] != NULL)
200 0 : elog(ERROR, "rel %d already exists", relid);
201 :
202 : /* Fetch RTE for relation */
203 720900 : rte = root->simple_rte_array[relid];
204 : Assert(rte != NULL);
205 :
206 720900 : rel = makeNode(RelOptInfo);
207 720900 : rel->reloptkind = parent ? RELOPT_OTHER_MEMBER_REL : RELOPT_BASEREL;
208 720900 : rel->relids = bms_make_singleton(relid);
209 720900 : rel->rows = 0;
210 : /* cheap startup cost is interesting iff not all tuples to be retrieved */
211 720900 : rel->consider_startup = (root->tuple_fraction > 0);
212 720900 : rel->consider_param_startup = false; /* might get changed later */
213 720900 : rel->consider_parallel = false; /* might get changed later */
214 720900 : rel->reltarget = create_empty_pathtarget();
215 720900 : rel->pathlist = NIL;
216 720900 : rel->ppilist = NIL;
217 720900 : rel->partial_pathlist = NIL;
218 720900 : rel->cheapest_startup_path = NULL;
219 720900 : rel->cheapest_total_path = NULL;
220 720900 : rel->cheapest_unique_path = NULL;
221 720900 : rel->cheapest_parameterized_paths = NIL;
222 720900 : rel->relid = relid;
223 720900 : rel->rtekind = rte->rtekind;
224 : /* min_attr, max_attr, attr_needed, attr_widths are set below */
225 720900 : rel->notnullattnums = NULL;
226 720900 : rel->lateral_vars = NIL;
227 720900 : rel->indexlist = NIL;
228 720900 : rel->statlist = NIL;
229 720900 : rel->pages = 0;
230 720900 : rel->tuples = 0;
231 720900 : rel->allvisfrac = 0;
232 720900 : rel->eclass_indexes = NULL;
233 720900 : rel->subroot = NULL;
234 720900 : rel->subplan_params = NIL;
235 720900 : rel->rel_parallel_workers = -1; /* set up in get_relation_info */
236 720900 : rel->amflags = 0;
237 720900 : rel->serverid = InvalidOid;
238 720900 : if (rte->rtekind == RTE_RELATION)
239 : {
240 : Assert(parent == NULL ||
241 : parent->rtekind == RTE_RELATION ||
242 : parent->rtekind == RTE_SUBQUERY);
243 :
244 : /*
245 : * For any RELATION rte, we need a userid with which to check
246 : * permission access. Baserels simply use their own
247 : * RTEPermissionInfo's checkAsUser.
248 : *
249 : * For otherrels normally there's no RTEPermissionInfo, so we use the
250 : * parent's, which normally has one. The exceptional case is that the
251 : * parent is a subquery, in which case the otherrel will have its own.
252 : */
253 426092 : if (rel->reloptkind == RELOPT_BASEREL ||
254 40274 : (rel->reloptkind == RELOPT_OTHER_MEMBER_REL &&
255 40274 : parent->rtekind == RTE_SUBQUERY))
256 386856 : {
257 : RTEPermissionInfo *perminfo;
258 :
259 386856 : perminfo = getRTEPermissionInfo(root->parse->rteperminfos, rte);
260 386856 : rel->userid = perminfo->checkAsUser;
261 : }
262 : else
263 39236 : rel->userid = parent->userid;
264 : }
265 : else
266 294808 : rel->userid = InvalidOid;
267 720900 : rel->useridiscurrent = false;
268 720900 : rel->fdwroutine = NULL;
269 720900 : rel->fdw_private = NULL;
270 720900 : rel->unique_for_rels = NIL;
271 720900 : rel->non_unique_for_rels = NIL;
272 720900 : rel->baserestrictinfo = NIL;
273 720900 : rel->baserestrictcost.startup = 0;
274 720900 : rel->baserestrictcost.per_tuple = 0;
275 720900 : rel->baserestrict_min_security = UINT_MAX;
276 720900 : rel->joininfo = NIL;
277 720900 : rel->has_eclass_joins = false;
278 720900 : rel->consider_partitionwise_join = false; /* might get changed later */
279 720900 : rel->part_scheme = NULL;
280 720900 : rel->nparts = -1;
281 720900 : rel->boundinfo = NULL;
282 720900 : rel->partbounds_merged = false;
283 720900 : rel->partition_qual = NIL;
284 720900 : rel->part_rels = NULL;
285 720900 : rel->live_parts = NULL;
286 720900 : rel->all_partrels = NULL;
287 720900 : rel->partexprs = NULL;
288 720900 : rel->nullable_partexprs = NULL;
289 :
290 : /*
291 : * Pass assorted information down the inheritance hierarchy.
292 : */
293 720900 : if (parent)
294 : {
295 : /* We keep back-links to immediate parent and topmost parent. */
296 43448 : rel->parent = parent;
297 43448 : rel->top_parent = parent->top_parent ? parent->top_parent : parent;
298 43448 : rel->top_parent_relids = rel->top_parent->relids;
299 :
300 : /*
301 : * A child rel is below the same outer joins as its parent. (We
302 : * presume this info was already calculated for the parent.)
303 : */
304 43448 : rel->nulling_relids = parent->nulling_relids;
305 :
306 : /*
307 : * Also propagate lateral-reference information from appendrel parent
308 : * rels to their child rels. We intentionally give each child rel the
309 : * same minimum parameterization, even though it's quite possible that
310 : * some don't reference all the lateral rels. This is because any
311 : * append path for the parent will have to have the same
312 : * parameterization for every child anyway, and there's no value in
313 : * forcing extra reparameterize_path() calls. Similarly, a lateral
314 : * reference to the parent prevents use of otherwise-movable join rels
315 : * for each child.
316 : *
317 : * It's possible for child rels to have their own children, in which
318 : * case the topmost parent's lateral info propagates all the way down.
319 : */
320 43448 : rel->direct_lateral_relids = parent->direct_lateral_relids;
321 43448 : rel->lateral_relids = parent->lateral_relids;
322 43448 : rel->lateral_referencers = parent->lateral_referencers;
323 : }
324 : else
325 : {
326 677452 : rel->parent = NULL;
327 677452 : rel->top_parent = NULL;
328 677452 : rel->top_parent_relids = NULL;
329 677452 : rel->nulling_relids = NULL;
330 677452 : rel->direct_lateral_relids = NULL;
331 677452 : rel->lateral_relids = NULL;
332 677452 : rel->lateral_referencers = NULL;
333 : }
334 :
335 : /* Check type of rtable entry */
336 720900 : switch (rte->rtekind)
337 : {
338 426092 : case RTE_RELATION:
339 : /* Table --- retrieve statistics from the system catalogs */
340 426092 : get_relation_info(root, rte->relid, rte->inh, rel);
341 426074 : break;
342 81898 : case RTE_SUBQUERY:
343 : case RTE_FUNCTION:
344 : case RTE_TABLEFUNC:
345 : case RTE_VALUES:
346 : case RTE_CTE:
347 : case RTE_NAMEDTUPLESTORE:
348 :
349 : /*
350 : * Subquery, function, tablefunc, values list, CTE, or ENR --- set
351 : * up attr range and arrays
352 : *
353 : * Note: 0 is included in range to support whole-row Vars
354 : */
355 81898 : rel->min_attr = 0;
356 81898 : rel->max_attr = list_length(rte->eref->colnames);
357 81898 : rel->attr_needed = (Relids *)
358 81898 : palloc0((rel->max_attr - rel->min_attr + 1) * sizeof(Relids));
359 81898 : rel->attr_widths = (int32 *)
360 81898 : palloc0((rel->max_attr - rel->min_attr + 1) * sizeof(int32));
361 81898 : break;
362 212910 : case RTE_RESULT:
363 : /* RTE_RESULT has no columns, nor could it have whole-row Var */
364 212910 : rel->min_attr = 0;
365 212910 : rel->max_attr = -1;
366 212910 : rel->attr_needed = NULL;
367 212910 : rel->attr_widths = NULL;
368 212910 : break;
369 0 : default:
370 0 : elog(ERROR, "unrecognized RTE kind: %d",
371 : (int) rte->rtekind);
372 : break;
373 : }
374 :
375 : /*
376 : * We must apply the partially filled in RelOptInfo before calling
377 : * apply_child_basequals due to some transformations within that function
378 : * which require the RelOptInfo to be available in the simple_rel_array.
379 : */
380 720882 : root->simple_rel_array[relid] = rel;
381 :
382 : /*
383 : * Apply the parent's quals to the child, with appropriate substitution of
384 : * variables. If the resulting clause is constant-FALSE or NULL after
385 : * applying transformations, apply_child_basequals returns false to
386 : * indicate that scanning this relation won't yield any rows. In this
387 : * case, we mark the child as dummy right away. (We must do this
388 : * immediately so that pruning works correctly when recursing in
389 : * expand_partitioned_rtentry.)
390 : */
391 720882 : if (parent)
392 : {
393 43448 : AppendRelInfo *appinfo = root->append_rel_array[relid];
394 :
395 : Assert(appinfo != NULL);
396 43448 : if (!apply_child_basequals(root, parent, rel, rte, appinfo))
397 : {
398 : /*
399 : * Restriction clause reduced to constant FALSE or NULL. Mark as
400 : * dummy so we won't scan this relation.
401 : */
402 90 : mark_dummy_rel(rel);
403 : }
404 : }
405 :
406 720882 : return rel;
407 : }
408 :
409 : /*
410 : * find_base_rel
411 : * Find a base or otherrel relation entry, which must already exist.
412 : */
413 : RelOptInfo *
414 5758984 : find_base_rel(PlannerInfo *root, int relid)
415 : {
416 : RelOptInfo *rel;
417 :
418 : /* use an unsigned comparison to prevent negative array element access */
419 5758984 : if ((uint32) relid < (uint32) root->simple_rel_array_size)
420 : {
421 5758984 : rel = root->simple_rel_array[relid];
422 5758984 : if (rel)
423 5758984 : return rel;
424 : }
425 :
426 0 : elog(ERROR, "no relation entry for relid %d", relid);
427 :
428 : return NULL; /* keep compiler quiet */
429 : }
430 :
431 : /*
432 : * find_base_rel_noerr
433 : * Find a base or otherrel relation entry, returning NULL if there's none
434 : */
435 : RelOptInfo *
436 1269694 : find_base_rel_noerr(PlannerInfo *root, int relid)
437 : {
438 : /* use an unsigned comparison to prevent negative array element access */
439 1269694 : if ((uint32) relid < (uint32) root->simple_rel_array_size)
440 1269694 : return root->simple_rel_array[relid];
441 0 : return NULL;
442 : }
443 :
444 : /*
445 : * find_base_rel_ignore_join
446 : * Find a base or otherrel relation entry, which must already exist.
447 : *
448 : * Unlike find_base_rel, if relid references an outer join then this
449 : * will return NULL rather than raising an error. This is convenient
450 : * for callers that must deal with relid sets including both base and
451 : * outer joins.
452 : */
453 : RelOptInfo *
454 161090 : find_base_rel_ignore_join(PlannerInfo *root, int relid)
455 : {
456 : /* use an unsigned comparison to prevent negative array element access */
457 161090 : if ((uint32) relid < (uint32) root->simple_rel_array_size)
458 : {
459 : RelOptInfo *rel;
460 : RangeTblEntry *rte;
461 :
462 161090 : rel = root->simple_rel_array[relid];
463 161090 : if (rel)
464 149116 : return rel;
465 :
466 : /*
467 : * We could just return NULL here, but for debugging purposes it seems
468 : * best to actually verify that the relid is an outer join and not
469 : * something weird.
470 : */
471 11974 : rte = root->simple_rte_array[relid];
472 11974 : if (rte && rte->rtekind == RTE_JOIN && rte->jointype != JOIN_INNER)
473 11974 : return NULL;
474 : }
475 :
476 0 : elog(ERROR, "no relation entry for relid %d", relid);
477 :
478 : return NULL; /* keep compiler quiet */
479 : }
480 :
481 : /*
482 : * build_join_rel_hash
483 : * Construct the auxiliary hash table for join relations.
484 : */
485 : static void
486 44 : build_join_rel_hash(PlannerInfo *root)
487 : {
488 : HTAB *hashtab;
489 : HASHCTL hash_ctl;
490 : ListCell *l;
491 :
492 : /* Create the hash table */
493 44 : hash_ctl.keysize = sizeof(Relids);
494 44 : hash_ctl.entrysize = sizeof(JoinHashEntry);
495 44 : hash_ctl.hash = bitmap_hash;
496 44 : hash_ctl.match = bitmap_match;
497 44 : hash_ctl.hcxt = CurrentMemoryContext;
498 44 : hashtab = hash_create("JoinRelHashTable",
499 : 256L,
500 : &hash_ctl,
501 : HASH_ELEM | HASH_FUNCTION | HASH_COMPARE | HASH_CONTEXT);
502 :
503 : /* Insert all the already-existing joinrels */
504 1496 : foreach(l, root->join_rel_list)
505 : {
506 1452 : RelOptInfo *rel = (RelOptInfo *) lfirst(l);
507 : JoinHashEntry *hentry;
508 : bool found;
509 :
510 1452 : hentry = (JoinHashEntry *) hash_search(hashtab,
511 1452 : &(rel->relids),
512 : HASH_ENTER,
513 : &found);
514 : Assert(!found);
515 1452 : hentry->join_rel = rel;
516 : }
517 :
518 44 : root->join_rel_hash = hashtab;
519 44 : }
520 :
521 : /*
522 : * find_join_rel
523 : * Returns relation entry corresponding to 'relids' (a set of RT indexes),
524 : * or NULL if none exists. This is for join relations.
525 : */
526 : RelOptInfo *
527 278678 : find_join_rel(PlannerInfo *root, Relids relids)
528 : {
529 : /*
530 : * Switch to using hash lookup when list grows "too long". The threshold
531 : * is arbitrary and is known only here.
532 : */
533 278678 : if (!root->join_rel_hash && list_length(root->join_rel_list) > 32)
534 44 : build_join_rel_hash(root);
535 :
536 : /*
537 : * Use either hashtable lookup or linear search, as appropriate.
538 : *
539 : * Note: the seemingly redundant hashkey variable is used to avoid taking
540 : * the address of relids; unless the compiler is exceedingly smart, doing
541 : * so would force relids out of a register and thus probably slow down the
542 : * list-search case.
543 : */
544 278678 : if (root->join_rel_hash)
545 : {
546 3930 : Relids hashkey = relids;
547 : JoinHashEntry *hentry;
548 :
549 3930 : hentry = (JoinHashEntry *) hash_search(root->join_rel_hash,
550 : &hashkey,
551 : HASH_FIND,
552 : NULL);
553 3930 : if (hentry)
554 3474 : return hentry->join_rel;
555 : }
556 : else
557 : {
558 : ListCell *l;
559 :
560 1642298 : foreach(l, root->join_rel_list)
561 : {
562 1460894 : RelOptInfo *rel = (RelOptInfo *) lfirst(l);
563 :
564 1460894 : if (bms_equal(rel->relids, relids))
565 93344 : return rel;
566 : }
567 : }
568 :
569 181860 : return NULL;
570 : }
571 :
572 : /*
573 : * set_foreign_rel_properties
574 : * Set up foreign-join fields if outer and inner relation are foreign
575 : * tables (or joins) belonging to the same server and assigned to the same
576 : * user to check access permissions as.
577 : *
578 : * In addition to an exact match of userid, we allow the case where one side
579 : * has zero userid (implying current user) and the other side has explicit
580 : * userid that happens to equal the current user; but in that case, pushdown of
581 : * the join is only valid for the current user. The useridiscurrent field
582 : * records whether we had to make such an assumption for this join or any
583 : * sub-join.
584 : *
585 : * Otherwise these fields are left invalid, so GetForeignJoinPaths will not be
586 : * called for the join relation.
587 : */
588 : static void
589 185790 : set_foreign_rel_properties(RelOptInfo *joinrel, RelOptInfo *outer_rel,
590 : RelOptInfo *inner_rel)
591 : {
592 185790 : if (OidIsValid(outer_rel->serverid) &&
593 842 : inner_rel->serverid == outer_rel->serverid)
594 : {
595 766 : if (inner_rel->userid == outer_rel->userid)
596 : {
597 754 : joinrel->serverid = outer_rel->serverid;
598 754 : joinrel->userid = outer_rel->userid;
599 754 : joinrel->useridiscurrent = outer_rel->useridiscurrent || inner_rel->useridiscurrent;
600 754 : joinrel->fdwroutine = outer_rel->fdwroutine;
601 : }
602 20 : else if (!OidIsValid(inner_rel->userid) &&
603 8 : outer_rel->userid == GetUserId())
604 : {
605 4 : joinrel->serverid = outer_rel->serverid;
606 4 : joinrel->userid = outer_rel->userid;
607 4 : joinrel->useridiscurrent = true;
608 4 : joinrel->fdwroutine = outer_rel->fdwroutine;
609 : }
610 8 : else if (!OidIsValid(outer_rel->userid) &&
611 0 : inner_rel->userid == GetUserId())
612 : {
613 0 : joinrel->serverid = outer_rel->serverid;
614 0 : joinrel->userid = inner_rel->userid;
615 0 : joinrel->useridiscurrent = true;
616 0 : joinrel->fdwroutine = outer_rel->fdwroutine;
617 : }
618 : }
619 185790 : }
620 :
621 : /*
622 : * add_join_rel
623 : * Add given join relation to the list of join relations in the given
624 : * PlannerInfo. Also add it to the auxiliary hashtable if there is one.
625 : */
626 : static void
627 185790 : add_join_rel(PlannerInfo *root, RelOptInfo *joinrel)
628 : {
629 : /* GEQO requires us to append the new joinrel to the end of the list! */
630 185790 : root->join_rel_list = lappend(root->join_rel_list, joinrel);
631 :
632 : /* store it into the auxiliary hashtable if there is one. */
633 185790 : if (root->join_rel_hash)
634 : {
635 : JoinHashEntry *hentry;
636 : bool found;
637 :
638 456 : hentry = (JoinHashEntry *) hash_search(root->join_rel_hash,
639 456 : &(joinrel->relids),
640 : HASH_ENTER,
641 : &found);
642 : Assert(!found);
643 456 : hentry->join_rel = joinrel;
644 : }
645 185790 : }
646 :
647 : /*
648 : * build_join_rel
649 : * Returns relation entry corresponding to the union of two given rels,
650 : * creating a new relation entry if none already exists.
651 : *
652 : * 'joinrelids' is the Relids set that uniquely identifies the join
653 : * 'outer_rel' and 'inner_rel' are relation nodes for the relations to be
654 : * joined
655 : * 'sjinfo': join context info
656 : * 'pushed_down_joins': any pushed-down outer joins that are now completed
657 : * 'restrictlist_ptr': result variable. If not NULL, *restrictlist_ptr
658 : * receives the list of RestrictInfo nodes that apply to this
659 : * particular pair of joinable relations.
660 : *
661 : * restrictlist_ptr makes the routine's API a little grotty, but it saves
662 : * duplicated calculation of the restrictlist...
663 : */
664 : RelOptInfo *
665 275690 : build_join_rel(PlannerInfo *root,
666 : Relids joinrelids,
667 : RelOptInfo *outer_rel,
668 : RelOptInfo *inner_rel,
669 : SpecialJoinInfo *sjinfo,
670 : List *pushed_down_joins,
671 : List **restrictlist_ptr)
672 : {
673 : RelOptInfo *joinrel;
674 : List *restrictlist;
675 :
676 : /* This function should be used only for join between parents. */
677 : Assert(!IS_OTHER_REL(outer_rel) && !IS_OTHER_REL(inner_rel));
678 :
679 : /*
680 : * See if we already have a joinrel for this set of base rels.
681 : */
682 275690 : joinrel = find_join_rel(root, joinrelids);
683 :
684 275690 : if (joinrel)
685 : {
686 : /*
687 : * Yes, so we only need to figure the restrictlist for this particular
688 : * pair of component relations.
689 : */
690 94674 : if (restrictlist_ptr)
691 94674 : *restrictlist_ptr = build_joinrel_restrictlist(root,
692 : joinrel,
693 : outer_rel,
694 : inner_rel,
695 : sjinfo);
696 94674 : return joinrel;
697 : }
698 :
699 : /*
700 : * Nope, so make one.
701 : */
702 181016 : joinrel = makeNode(RelOptInfo);
703 181016 : joinrel->reloptkind = RELOPT_JOINREL;
704 181016 : joinrel->relids = bms_copy(joinrelids);
705 181016 : joinrel->rows = 0;
706 : /* cheap startup cost is interesting iff not all tuples to be retrieved */
707 181016 : joinrel->consider_startup = (root->tuple_fraction > 0);
708 181016 : joinrel->consider_param_startup = false;
709 181016 : joinrel->consider_parallel = false;
710 181016 : joinrel->reltarget = create_empty_pathtarget();
711 181016 : joinrel->pathlist = NIL;
712 181016 : joinrel->ppilist = NIL;
713 181016 : joinrel->partial_pathlist = NIL;
714 181016 : joinrel->cheapest_startup_path = NULL;
715 181016 : joinrel->cheapest_total_path = NULL;
716 181016 : joinrel->cheapest_unique_path = NULL;
717 181016 : joinrel->cheapest_parameterized_paths = NIL;
718 : /* init direct_lateral_relids from children; we'll finish it up below */
719 181016 : joinrel->direct_lateral_relids =
720 181016 : bms_union(outer_rel->direct_lateral_relids,
721 181016 : inner_rel->direct_lateral_relids);
722 181016 : joinrel->lateral_relids = min_join_parameterization(root, joinrel->relids,
723 : outer_rel, inner_rel);
724 181016 : joinrel->relid = 0; /* indicates not a baserel */
725 181016 : joinrel->rtekind = RTE_JOIN;
726 181016 : joinrel->min_attr = 0;
727 181016 : joinrel->max_attr = 0;
728 181016 : joinrel->attr_needed = NULL;
729 181016 : joinrel->attr_widths = NULL;
730 181016 : joinrel->notnullattnums = NULL;
731 181016 : joinrel->nulling_relids = NULL;
732 181016 : joinrel->lateral_vars = NIL;
733 181016 : joinrel->lateral_referencers = NULL;
734 181016 : joinrel->indexlist = NIL;
735 181016 : joinrel->statlist = NIL;
736 181016 : joinrel->pages = 0;
737 181016 : joinrel->tuples = 0;
738 181016 : joinrel->allvisfrac = 0;
739 181016 : joinrel->eclass_indexes = NULL;
740 181016 : joinrel->subroot = NULL;
741 181016 : joinrel->subplan_params = NIL;
742 181016 : joinrel->rel_parallel_workers = -1;
743 181016 : joinrel->amflags = 0;
744 181016 : joinrel->serverid = InvalidOid;
745 181016 : joinrel->userid = InvalidOid;
746 181016 : joinrel->useridiscurrent = false;
747 181016 : joinrel->fdwroutine = NULL;
748 181016 : joinrel->fdw_private = NULL;
749 181016 : joinrel->unique_for_rels = NIL;
750 181016 : joinrel->non_unique_for_rels = NIL;
751 181016 : joinrel->baserestrictinfo = NIL;
752 181016 : joinrel->baserestrictcost.startup = 0;
753 181016 : joinrel->baserestrictcost.per_tuple = 0;
754 181016 : joinrel->baserestrict_min_security = UINT_MAX;
755 181016 : joinrel->joininfo = NIL;
756 181016 : joinrel->has_eclass_joins = false;
757 181016 : joinrel->consider_partitionwise_join = false; /* might get changed later */
758 181016 : joinrel->parent = NULL;
759 181016 : joinrel->top_parent = NULL;
760 181016 : joinrel->top_parent_relids = NULL;
761 181016 : joinrel->part_scheme = NULL;
762 181016 : joinrel->nparts = -1;
763 181016 : joinrel->boundinfo = NULL;
764 181016 : joinrel->partbounds_merged = false;
765 181016 : joinrel->partition_qual = NIL;
766 181016 : joinrel->part_rels = NULL;
767 181016 : joinrel->live_parts = NULL;
768 181016 : joinrel->all_partrels = NULL;
769 181016 : joinrel->partexprs = NULL;
770 181016 : joinrel->nullable_partexprs = NULL;
771 :
772 : /* Compute information relevant to the foreign relations. */
773 181016 : set_foreign_rel_properties(joinrel, outer_rel, inner_rel);
774 :
775 : /*
776 : * Fill the joinrel's tlist with just the Vars and PHVs that need to be
777 : * output from this join (ie, are needed for higher joinclauses or final
778 : * output).
779 : *
780 : * NOTE: the tlist order for a join rel will depend on which pair of outer
781 : * and inner rels we first try to build it from. But the contents should
782 : * be the same regardless.
783 : */
784 181016 : build_joinrel_tlist(root, joinrel, outer_rel, sjinfo, pushed_down_joins,
785 181016 : (sjinfo->jointype == JOIN_FULL));
786 181016 : build_joinrel_tlist(root, joinrel, inner_rel, sjinfo, pushed_down_joins,
787 181016 : (sjinfo->jointype != JOIN_INNER));
788 181016 : add_placeholders_to_joinrel(root, joinrel, outer_rel, inner_rel, sjinfo);
789 :
790 : /*
791 : * add_placeholders_to_joinrel also took care of adding the ph_lateral
792 : * sets of any PlaceHolderVars computed here to direct_lateral_relids, so
793 : * now we can finish computing that. This is much like the computation of
794 : * the transitively-closed lateral_relids in min_join_parameterization,
795 : * except that here we *do* have to consider the added PHVs.
796 : */
797 181016 : joinrel->direct_lateral_relids =
798 181016 : bms_del_members(joinrel->direct_lateral_relids, joinrel->relids);
799 :
800 : /*
801 : * Construct restrict and join clause lists for the new joinrel. (The
802 : * caller might or might not need the restrictlist, but I need it anyway
803 : * for set_joinrel_size_estimates().)
804 : */
805 181016 : restrictlist = build_joinrel_restrictlist(root, joinrel,
806 : outer_rel, inner_rel,
807 : sjinfo);
808 181016 : if (restrictlist_ptr)
809 181016 : *restrictlist_ptr = restrictlist;
810 181016 : build_joinrel_joinlist(joinrel, outer_rel, inner_rel);
811 :
812 : /*
813 : * This is also the right place to check whether the joinrel has any
814 : * pending EquivalenceClass joins.
815 : */
816 181016 : joinrel->has_eclass_joins = has_relevant_eclass_joinclause(root, joinrel);
817 :
818 : /* Store the partition information. */
819 181016 : build_joinrel_partition_info(root, joinrel, outer_rel, inner_rel, sjinfo,
820 : restrictlist);
821 :
822 : /*
823 : * Set estimates of the joinrel's size.
824 : */
825 181016 : set_joinrel_size_estimates(root, joinrel, outer_rel, inner_rel,
826 : sjinfo, restrictlist);
827 :
828 : /*
829 : * Set the consider_parallel flag if this joinrel could potentially be
830 : * scanned within a parallel worker. If this flag is false for either
831 : * inner_rel or outer_rel, then it must be false for the joinrel also.
832 : * Even if both are true, there might be parallel-restricted expressions
833 : * in the targetlist or quals.
834 : *
835 : * Note that if there are more than two rels in this relation, they could
836 : * be divided between inner_rel and outer_rel in any arbitrary way. We
837 : * assume this doesn't matter, because we should hit all the same baserels
838 : * and joinclauses while building up to this joinrel no matter which we
839 : * take; therefore, we should make the same decision here however we get
840 : * here.
841 : */
842 329942 : if (inner_rel->consider_parallel && outer_rel->consider_parallel &&
843 297424 : is_parallel_safe(root, (Node *) restrictlist) &&
844 148498 : is_parallel_safe(root, (Node *) joinrel->reltarget->exprs))
845 148492 : joinrel->consider_parallel = true;
846 :
847 : /* Add the joinrel to the PlannerInfo. */
848 181016 : add_join_rel(root, joinrel);
849 :
850 : /*
851 : * Also, if dynamic-programming join search is active, add the new joinrel
852 : * to the appropriate sublist. Note: you might think the Assert on number
853 : * of members should be for equality, but some of the level 1 rels might
854 : * have been joinrels already, so we can only assert <=.
855 : */
856 181016 : if (root->join_rel_level)
857 : {
858 : Assert(root->join_cur_level > 0);
859 : Assert(root->join_cur_level <= bms_num_members(joinrel->relids));
860 177920 : root->join_rel_level[root->join_cur_level] =
861 177920 : lappend(root->join_rel_level[root->join_cur_level], joinrel);
862 : }
863 :
864 181016 : return joinrel;
865 : }
866 :
867 : /*
868 : * build_child_join_rel
869 : * Builds RelOptInfo representing join between given two child relations.
870 : *
871 : * 'outer_rel' and 'inner_rel' are the RelOptInfos of child relations being
872 : * joined
873 : * 'parent_joinrel' is the RelOptInfo representing the join between parent
874 : * relations. Some of the members of new RelOptInfo are produced by
875 : * translating corresponding members of this RelOptInfo
876 : * 'restrictlist': list of RestrictInfo nodes that apply to this particular
877 : * pair of joinable relations
878 : * 'sjinfo': child join's join-type details
879 : * 'nappinfos' and 'appinfos': AppendRelInfo array for child relids
880 : */
881 : RelOptInfo *
882 4774 : build_child_join_rel(PlannerInfo *root, RelOptInfo *outer_rel,
883 : RelOptInfo *inner_rel, RelOptInfo *parent_joinrel,
884 : List *restrictlist, SpecialJoinInfo *sjinfo,
885 : int nappinfos, AppendRelInfo **appinfos)
886 : {
887 4774 : RelOptInfo *joinrel = makeNode(RelOptInfo);
888 :
889 : /* Only joins between "other" relations land here. */
890 : Assert(IS_OTHER_REL(outer_rel) && IS_OTHER_REL(inner_rel));
891 :
892 : /* The parent joinrel should have consider_partitionwise_join set. */
893 : Assert(parent_joinrel->consider_partitionwise_join);
894 :
895 4774 : joinrel->reloptkind = RELOPT_OTHER_JOINREL;
896 4774 : joinrel->relids = adjust_child_relids(parent_joinrel->relids,
897 : nappinfos, appinfos);
898 4774 : joinrel->rows = 0;
899 : /* cheap startup cost is interesting iff not all tuples to be retrieved */
900 4774 : joinrel->consider_startup = (root->tuple_fraction > 0);
901 4774 : joinrel->consider_param_startup = false;
902 4774 : joinrel->consider_parallel = false;
903 4774 : joinrel->reltarget = create_empty_pathtarget();
904 4774 : joinrel->pathlist = NIL;
905 4774 : joinrel->ppilist = NIL;
906 4774 : joinrel->partial_pathlist = NIL;
907 4774 : joinrel->cheapest_startup_path = NULL;
908 4774 : joinrel->cheapest_total_path = NULL;
909 4774 : joinrel->cheapest_unique_path = NULL;
910 4774 : joinrel->cheapest_parameterized_paths = NIL;
911 4774 : joinrel->direct_lateral_relids = NULL;
912 4774 : joinrel->lateral_relids = NULL;
913 4774 : joinrel->relid = 0; /* indicates not a baserel */
914 4774 : joinrel->rtekind = RTE_JOIN;
915 4774 : joinrel->min_attr = 0;
916 4774 : joinrel->max_attr = 0;
917 4774 : joinrel->attr_needed = NULL;
918 4774 : joinrel->attr_widths = NULL;
919 4774 : joinrel->notnullattnums = NULL;
920 4774 : joinrel->nulling_relids = NULL;
921 4774 : joinrel->lateral_vars = NIL;
922 4774 : joinrel->lateral_referencers = NULL;
923 4774 : joinrel->indexlist = NIL;
924 4774 : joinrel->pages = 0;
925 4774 : joinrel->tuples = 0;
926 4774 : joinrel->allvisfrac = 0;
927 4774 : joinrel->eclass_indexes = NULL;
928 4774 : joinrel->subroot = NULL;
929 4774 : joinrel->subplan_params = NIL;
930 4774 : joinrel->amflags = 0;
931 4774 : joinrel->serverid = InvalidOid;
932 4774 : joinrel->userid = InvalidOid;
933 4774 : joinrel->useridiscurrent = false;
934 4774 : joinrel->fdwroutine = NULL;
935 4774 : joinrel->fdw_private = NULL;
936 4774 : joinrel->baserestrictinfo = NIL;
937 4774 : joinrel->baserestrictcost.startup = 0;
938 4774 : joinrel->baserestrictcost.per_tuple = 0;
939 4774 : joinrel->joininfo = NIL;
940 4774 : joinrel->has_eclass_joins = false;
941 4774 : joinrel->consider_partitionwise_join = false; /* might get changed later */
942 4774 : joinrel->parent = parent_joinrel;
943 4774 : joinrel->top_parent = parent_joinrel->top_parent ? parent_joinrel->top_parent : parent_joinrel;
944 4774 : joinrel->top_parent_relids = joinrel->top_parent->relids;
945 4774 : joinrel->part_scheme = NULL;
946 4774 : joinrel->nparts = -1;
947 4774 : joinrel->boundinfo = NULL;
948 4774 : joinrel->partbounds_merged = false;
949 4774 : joinrel->partition_qual = NIL;
950 4774 : joinrel->part_rels = NULL;
951 4774 : joinrel->live_parts = NULL;
952 4774 : joinrel->all_partrels = NULL;
953 4774 : joinrel->partexprs = NULL;
954 4774 : joinrel->nullable_partexprs = NULL;
955 :
956 : /* Compute information relevant to foreign relations. */
957 4774 : set_foreign_rel_properties(joinrel, outer_rel, inner_rel);
958 :
959 : /* Set up reltarget struct */
960 4774 : build_child_join_reltarget(root, parent_joinrel, joinrel,
961 : nappinfos, appinfos);
962 :
963 : /* Construct joininfo list. */
964 9548 : joinrel->joininfo = (List *) adjust_appendrel_attrs(root,
965 4774 : (Node *) parent_joinrel->joininfo,
966 : nappinfos,
967 : appinfos);
968 :
969 : /*
970 : * Lateral relids referred in child join will be same as that referred in
971 : * the parent relation.
972 : */
973 4774 : joinrel->direct_lateral_relids = (Relids) bms_copy(parent_joinrel->direct_lateral_relids);
974 4774 : joinrel->lateral_relids = (Relids) bms_copy(parent_joinrel->lateral_relids);
975 :
976 : /*
977 : * If the parent joinrel has pending equivalence classes, so does the
978 : * child.
979 : */
980 4774 : joinrel->has_eclass_joins = parent_joinrel->has_eclass_joins;
981 :
982 : /* Is the join between partitions itself partitioned? */
983 4774 : build_joinrel_partition_info(root, joinrel, outer_rel, inner_rel, sjinfo,
984 : restrictlist);
985 :
986 : /* Child joinrel is parallel safe if parent is parallel safe. */
987 4774 : joinrel->consider_parallel = parent_joinrel->consider_parallel;
988 :
989 : /* Set estimates of the child-joinrel's size. */
990 4774 : set_joinrel_size_estimates(root, joinrel, outer_rel, inner_rel,
991 : sjinfo, restrictlist);
992 :
993 : /* We build the join only once. */
994 : Assert(!find_join_rel(root, joinrel->relids));
995 :
996 : /* Add the relation to the PlannerInfo. */
997 4774 : add_join_rel(root, joinrel);
998 :
999 : /*
1000 : * We might need EquivalenceClass members corresponding to the child join,
1001 : * so that we can represent sort pathkeys for it. As with children of
1002 : * baserels, we shouldn't need this unless there are relevant eclass joins
1003 : * (implying that a merge join might be possible) or pathkeys to sort by.
1004 : */
1005 4774 : if (joinrel->has_eclass_joins || has_useful_pathkeys(root, parent_joinrel))
1006 4324 : add_child_join_rel_equivalences(root,
1007 : nappinfos, appinfos,
1008 : parent_joinrel, joinrel);
1009 :
1010 4774 : return joinrel;
1011 : }
1012 :
1013 : /*
1014 : * min_join_parameterization
1015 : *
1016 : * Determine the minimum possible parameterization of a joinrel, that is, the
1017 : * set of other rels it contains LATERAL references to. We save this value in
1018 : * the join's RelOptInfo. This function is split out of build_join_rel()
1019 : * because join_is_legal() needs the value to check a prospective join.
1020 : */
1021 : Relids
1022 197494 : min_join_parameterization(PlannerInfo *root,
1023 : Relids joinrelids,
1024 : RelOptInfo *outer_rel,
1025 : RelOptInfo *inner_rel)
1026 : {
1027 : Relids result;
1028 :
1029 : /*
1030 : * Basically we just need the union of the inputs' lateral_relids, less
1031 : * whatever is already in the join.
1032 : *
1033 : * It's not immediately obvious that this is a valid way to compute the
1034 : * result, because it might seem that we're ignoring possible lateral refs
1035 : * of PlaceHolderVars that are due to be computed at the join but not in
1036 : * either input. However, because create_lateral_join_info() already
1037 : * charged all such PHV refs to each member baserel of the join, they'll
1038 : * be accounted for already in the inputs' lateral_relids. Likewise, we
1039 : * do not need to worry about doing transitive closure here, because that
1040 : * was already accounted for in the original baserel lateral_relids.
1041 : */
1042 197494 : result = bms_union(outer_rel->lateral_relids, inner_rel->lateral_relids);
1043 197494 : result = bms_del_members(result, joinrelids);
1044 197494 : return result;
1045 : }
1046 :
1047 : /*
1048 : * build_joinrel_tlist
1049 : * Builds a join relation's target list from an input relation.
1050 : * (This is invoked twice to handle the two input relations.)
1051 : *
1052 : * The join's targetlist includes all Vars of its member relations that
1053 : * will still be needed above the join. This subroutine adds all such
1054 : * Vars from the specified input rel's tlist to the join rel's tlist.
1055 : * Likewise for any PlaceHolderVars emitted by the input rel.
1056 : *
1057 : * We also compute the expected width of the join's output, making use
1058 : * of data that was cached at the baserel level by set_rel_width().
1059 : *
1060 : * Pass can_null as true if the join is an outer join that can null Vars
1061 : * from this input relation. If so, we will (normally) add the join's relid
1062 : * to the nulling bitmaps of Vars and PHVs bubbled up from the input.
1063 : *
1064 : * When forming an outer join's target list, special handling is needed in
1065 : * case the outer join was commuted with another one per outer join identity 3
1066 : * (see optimizer/README). We must take steps to ensure that the output Vars
1067 : * have the same nulling bitmaps that they would if the two joins had been
1068 : * done in syntactic order; else they won't match Vars appearing higher in
1069 : * the query tree. An exception to the match-the-syntactic-order rule is
1070 : * that when an outer join is pushed down into another one's RHS per identity
1071 : * 3, we can't mark its Vars as nulled until the now-upper outer join is also
1072 : * completed. So we need to do three things:
1073 : *
1074 : * First, we add the outer join's relid to the nulling bitmap only if the
1075 : * outer join has been completely performed and the Var or PHV actually
1076 : * comes from within the syntactically nullable side(s) of the outer join.
1077 : * This takes care of the possibility that we have transformed
1078 : * (A leftjoin B on (Pab)) leftjoin C on (Pbc)
1079 : * to
1080 : * A leftjoin (B leftjoin C on (Pbc)) on (Pab)
1081 : * Here the pushed-down B/C join cannot mark C columns as nulled yet,
1082 : * while the now-upper A/B join must not mark C columns as nulled by itself.
1083 : *
1084 : * Second, perform the same operation for each SpecialJoinInfo listed in
1085 : * pushed_down_joins (which, in this example, would be the B/C join when
1086 : * we are at the now-upper A/B join). This allows the now-upper join to
1087 : * complete the marking of "C" Vars that now have fully valid values.
1088 : *
1089 : * Third, any relid in sjinfo->commute_above_r that is already part of
1090 : * the joinrel is added to the nulling bitmaps of nullable Vars and PHVs.
1091 : * This takes care of the reverse case where we implement
1092 : * A leftjoin (B leftjoin C on (Pbc)) on (Pab)
1093 : * as
1094 : * (A leftjoin B on (Pab)) leftjoin C on (Pbc)
1095 : * The C columns emitted by the B/C join need to be shown as nulled by both
1096 : * the B/C and A/B joins, even though they've not physically traversed the
1097 : * A/B join.
1098 : */
1099 : static void
1100 362032 : build_joinrel_tlist(PlannerInfo *root, RelOptInfo *joinrel,
1101 : RelOptInfo *input_rel,
1102 : SpecialJoinInfo *sjinfo,
1103 : List *pushed_down_joins,
1104 : bool can_null)
1105 : {
1106 362032 : Relids relids = joinrel->relids;
1107 362032 : int64 tuple_width = joinrel->reltarget->width;
1108 : ListCell *vars;
1109 : ListCell *lc;
1110 :
1111 1728024 : foreach(vars, input_rel->reltarget->exprs)
1112 : {
1113 1365992 : Var *var = (Var *) lfirst(vars);
1114 :
1115 : /*
1116 : * For a PlaceHolderVar, we have to look up the PlaceHolderInfo.
1117 : */
1118 1365992 : if (IsA(var, PlaceHolderVar))
1119 : {
1120 1828 : PlaceHolderVar *phv = (PlaceHolderVar *) var;
1121 1828 : PlaceHolderInfo *phinfo = find_placeholder_info(root, phv);
1122 :
1123 : /* Is it still needed above this joinrel? */
1124 1828 : if (bms_nonempty_difference(phinfo->ph_needed, relids))
1125 : {
1126 : /*
1127 : * Yup, add it to the output. If this join potentially nulls
1128 : * this input, we have to update the PHV's phnullingrels,
1129 : * which means making a copy.
1130 : */
1131 1318 : if (can_null)
1132 : {
1133 904 : phv = copyObject(phv);
1134 : /* See comments above to understand this logic */
1135 1808 : if (sjinfo->ojrelid != 0 &&
1136 1784 : bms_is_member(sjinfo->ojrelid, relids) &&
1137 880 : (bms_is_subset(phv->phrels, sjinfo->syn_righthand) ||
1138 240 : (sjinfo->jointype == JOIN_FULL &&
1139 114 : bms_is_subset(phv->phrels, sjinfo->syn_lefthand))))
1140 868 : phv->phnullingrels = bms_add_member(phv->phnullingrels,
1141 868 : sjinfo->ojrelid);
1142 922 : foreach(lc, pushed_down_joins)
1143 : {
1144 18 : SpecialJoinInfo *othersj = (SpecialJoinInfo *) lfirst(lc);
1145 :
1146 : Assert(bms_is_member(othersj->ojrelid, relids));
1147 18 : if (bms_is_subset(phv->phrels, othersj->syn_righthand))
1148 12 : phv->phnullingrels = bms_add_member(phv->phnullingrels,
1149 12 : othersj->ojrelid);
1150 : }
1151 904 : phv->phnullingrels =
1152 904 : bms_join(phv->phnullingrels,
1153 904 : bms_intersect(sjinfo->commute_above_r,
1154 : relids));
1155 : }
1156 :
1157 1318 : joinrel->reltarget->exprs = lappend(joinrel->reltarget->exprs,
1158 : phv);
1159 : /* Bubbling up the precomputed result has cost zero */
1160 1318 : tuple_width += phinfo->ph_width;
1161 : }
1162 1828 : continue;
1163 : }
1164 :
1165 : /*
1166 : * Otherwise, anything in a baserel or joinrel targetlist ought to be
1167 : * a Var. (More general cases can only appear in appendrel child
1168 : * rels, which will never be seen here.)
1169 : */
1170 1364164 : if (!IsA(var, Var))
1171 0 : elog(ERROR, "unexpected node type in rel targetlist: %d",
1172 : (int) nodeTag(var));
1173 :
1174 1364164 : if (var->varno == ROWID_VAR)
1175 : {
1176 : /* UPDATE/DELETE/MERGE row identity vars are always needed */
1177 : RowIdentityVarInfo *ridinfo = (RowIdentityVarInfo *)
1178 1044 : list_nth(root->row_identity_vars, var->varattno - 1);
1179 :
1180 : /* Update reltarget width estimate from RowIdentityVarInfo */
1181 1044 : tuple_width += ridinfo->rowidwidth;
1182 : }
1183 : else
1184 : {
1185 : RelOptInfo *baserel;
1186 : int ndx;
1187 :
1188 : /* Get the Var's original base rel */
1189 1363120 : baserel = find_base_rel(root, var->varno);
1190 :
1191 : /* Is it still needed above this joinrel? */
1192 1363120 : ndx = var->varattno - baserel->min_attr;
1193 1363120 : if (!bms_nonempty_difference(baserel->attr_needed[ndx], relids))
1194 262542 : continue; /* nope, skip it */
1195 :
1196 : /* Update reltarget width estimate from baserel's attr_widths */
1197 1100578 : tuple_width += baserel->attr_widths[ndx];
1198 : }
1199 :
1200 : /*
1201 : * Add the Var to the output. If this join potentially nulls this
1202 : * input, we have to update the Var's varnullingrels, which means
1203 : * making a copy. But note that we don't ever add nullingrel bits to
1204 : * row identity Vars (cf. comments in setrefs.c).
1205 : */
1206 1101622 : if (can_null && var->varno != ROWID_VAR)
1207 : {
1208 116888 : var = copyObject(var);
1209 : /* See comments above to understand this logic */
1210 233184 : if (sjinfo->ojrelid != 0 &&
1211 227774 : bms_is_member(sjinfo->ojrelid, relids) &&
1212 111478 : (bms_is_member(var->varno, sjinfo->syn_righthand) ||
1213 3792 : (sjinfo->jointype == JOIN_FULL &&
1214 1776 : bms_is_member(var->varno, sjinfo->syn_lefthand))))
1215 111238 : var->varnullingrels = bms_add_member(var->varnullingrels,
1216 111238 : sjinfo->ojrelid);
1217 117422 : foreach(lc, pushed_down_joins)
1218 : {
1219 534 : SpecialJoinInfo *othersj = (SpecialJoinInfo *) lfirst(lc);
1220 :
1221 : Assert(bms_is_member(othersj->ojrelid, relids));
1222 534 : if (bms_is_member(var->varno, othersj->syn_righthand))
1223 240 : var->varnullingrels = bms_add_member(var->varnullingrels,
1224 240 : othersj->ojrelid);
1225 : }
1226 116888 : var->varnullingrels =
1227 116888 : bms_join(var->varnullingrels,
1228 116888 : bms_intersect(sjinfo->commute_above_r,
1229 : relids));
1230 : }
1231 :
1232 1101622 : joinrel->reltarget->exprs = lappend(joinrel->reltarget->exprs,
1233 : var);
1234 :
1235 : /* Vars have cost zero, so no need to adjust reltarget->cost */
1236 : }
1237 :
1238 362032 : joinrel->reltarget->width = clamp_width_est(tuple_width);
1239 362032 : }
1240 :
1241 : /*
1242 : * build_joinrel_restrictlist
1243 : * build_joinrel_joinlist
1244 : * These routines build lists of restriction and join clauses for a
1245 : * join relation from the joininfo lists of the relations it joins.
1246 : *
1247 : * These routines are separate because the restriction list must be
1248 : * built afresh for each pair of input sub-relations we consider, whereas
1249 : * the join list need only be computed once for any join RelOptInfo.
1250 : * The join list is fully determined by the set of rels making up the
1251 : * joinrel, so we should get the same results (up to ordering) from any
1252 : * candidate pair of sub-relations. But the restriction list is whatever
1253 : * is not handled in the sub-relations, so it depends on which
1254 : * sub-relations are considered.
1255 : *
1256 : * If a join clause from an input relation refers to base+OJ rels still not
1257 : * present in the joinrel, then it is still a join clause for the joinrel;
1258 : * we put it into the joininfo list for the joinrel. Otherwise,
1259 : * the clause is now a restrict clause for the joined relation, and we
1260 : * return it to the caller of build_joinrel_restrictlist() to be stored in
1261 : * join paths made from this pair of sub-relations. (It will not need to
1262 : * be considered further up the join tree.)
1263 : *
1264 : * In many cases we will find the same RestrictInfos in both input
1265 : * relations' joinlists, so be careful to eliminate duplicates.
1266 : * Pointer equality should be a sufficient test for dups, since all
1267 : * the various joinlist entries ultimately refer to RestrictInfos
1268 : * pushed into them by distribute_restrictinfo_to_rels().
1269 : *
1270 : * 'joinrel' is a join relation node
1271 : * 'outer_rel' and 'inner_rel' are a pair of relations that can be joined
1272 : * to form joinrel.
1273 : * 'sjinfo': join context info
1274 : *
1275 : * build_joinrel_restrictlist() returns a list of relevant restrictinfos,
1276 : * whereas build_joinrel_joinlist() stores its results in the joinrel's
1277 : * joininfo list. One or the other must accept each given clause!
1278 : *
1279 : * NB: Formerly, we made deep(!) copies of each input RestrictInfo to pass
1280 : * up to the join relation. I believe this is no longer necessary, because
1281 : * RestrictInfo nodes are no longer context-dependent. Instead, just include
1282 : * the original nodes in the lists made for the join relation.
1283 : */
1284 : static List *
1285 275690 : build_joinrel_restrictlist(PlannerInfo *root,
1286 : RelOptInfo *joinrel,
1287 : RelOptInfo *outer_rel,
1288 : RelOptInfo *inner_rel,
1289 : SpecialJoinInfo *sjinfo)
1290 : {
1291 : List *result;
1292 : Relids both_input_relids;
1293 :
1294 275690 : both_input_relids = bms_union(outer_rel->relids, inner_rel->relids);
1295 :
1296 : /*
1297 : * Collect all the clauses that syntactically belong at this level,
1298 : * eliminating any duplicates (important since we will see many of the
1299 : * same clauses arriving from both input relations).
1300 : */
1301 275690 : result = subbuild_joinrel_restrictlist(root, joinrel, outer_rel,
1302 : both_input_relids, NIL);
1303 275690 : result = subbuild_joinrel_restrictlist(root, joinrel, inner_rel,
1304 : both_input_relids, result);
1305 :
1306 : /*
1307 : * Add on any clauses derived from EquivalenceClasses. These cannot be
1308 : * redundant with the clauses in the joininfo lists, so don't bother
1309 : * checking.
1310 : */
1311 275690 : result = list_concat(result,
1312 275690 : generate_join_implied_equalities(root,
1313 : joinrel->relids,
1314 : outer_rel->relids,
1315 : inner_rel,
1316 : sjinfo));
1317 :
1318 275690 : return result;
1319 : }
1320 :
1321 : static void
1322 181016 : build_joinrel_joinlist(RelOptInfo *joinrel,
1323 : RelOptInfo *outer_rel,
1324 : RelOptInfo *inner_rel)
1325 : {
1326 : List *result;
1327 :
1328 : /*
1329 : * Collect all the clauses that syntactically belong above this level,
1330 : * eliminating any duplicates (important since we will see many of the
1331 : * same clauses arriving from both input relations).
1332 : */
1333 181016 : result = subbuild_joinrel_joinlist(joinrel, outer_rel->joininfo, NIL);
1334 181016 : result = subbuild_joinrel_joinlist(joinrel, inner_rel->joininfo, result);
1335 :
1336 181016 : joinrel->joininfo = result;
1337 181016 : }
1338 :
1339 : static List *
1340 551380 : subbuild_joinrel_restrictlist(PlannerInfo *root,
1341 : RelOptInfo *joinrel,
1342 : RelOptInfo *input_rel,
1343 : Relids both_input_relids,
1344 : List *new_restrictlist)
1345 : {
1346 : ListCell *l;
1347 :
1348 1048534 : foreach(l, input_rel->joininfo)
1349 : {
1350 497154 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
1351 :
1352 497154 : if (bms_is_subset(rinfo->required_relids, joinrel->relids))
1353 : {
1354 : /*
1355 : * This clause should become a restriction clause for the joinrel,
1356 : * since it refers to no outside rels. However, if it's a clone
1357 : * clause then it might be too late to evaluate it, so we have to
1358 : * check. (If it is too late, just ignore the clause, taking it
1359 : * on faith that another clone was or will be selected.) Clone
1360 : * clauses should always be outer-join clauses, so we compare
1361 : * against both_input_relids.
1362 : */
1363 294836 : if (rinfo->has_clone || rinfo->is_clone)
1364 : {
1365 : Assert(!RINFO_IS_PUSHED_DOWN(rinfo, joinrel->relids));
1366 45964 : if (!bms_is_subset(rinfo->required_relids, both_input_relids))
1367 7480 : continue;
1368 38484 : if (bms_overlap(rinfo->incompatible_relids, both_input_relids))
1369 14688 : continue;
1370 : }
1371 : else
1372 : {
1373 : /*
1374 : * For non-clone clauses, we just Assert it's OK. These might
1375 : * be either join or filter clauses; if it's a join clause
1376 : * then it should not refer to the current join's output.
1377 : * (There is little point in checking incompatible_relids,
1378 : * because it'll be NULL.)
1379 : */
1380 : Assert(RINFO_IS_PUSHED_DOWN(rinfo, joinrel->relids) ||
1381 : bms_is_subset(rinfo->required_relids,
1382 : both_input_relids));
1383 : }
1384 :
1385 : /*
1386 : * OK, so add it to the list, being careful to eliminate
1387 : * duplicates. (Since RestrictInfo nodes in different joinlists
1388 : * will have been multiply-linked rather than copied, pointer
1389 : * equality should be a sufficient test.)
1390 : */
1391 272668 : new_restrictlist = list_append_unique_ptr(new_restrictlist, rinfo);
1392 : }
1393 : else
1394 : {
1395 : /*
1396 : * This clause is still a join clause at this level, so we ignore
1397 : * it in this routine.
1398 : */
1399 : }
1400 : }
1401 :
1402 551380 : return new_restrictlist;
1403 : }
1404 :
1405 : static List *
1406 362032 : subbuild_joinrel_joinlist(RelOptInfo *joinrel,
1407 : List *joininfo_list,
1408 : List *new_joininfo)
1409 : {
1410 : ListCell *l;
1411 :
1412 : /* Expected to be called only for join between parent relations. */
1413 : Assert(joinrel->reloptkind == RELOPT_JOINREL);
1414 :
1415 678260 : foreach(l, joininfo_list)
1416 : {
1417 316228 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
1418 :
1419 316228 : if (bms_is_subset(rinfo->required_relids, joinrel->relids))
1420 : {
1421 : /*
1422 : * This clause becomes a restriction clause for the joinrel, since
1423 : * it refers to no outside rels. So we can ignore it in this
1424 : * routine.
1425 : */
1426 : }
1427 : else
1428 : {
1429 : /*
1430 : * This clause is still a join clause at this level, so add it to
1431 : * the new joininfo list, being careful to eliminate duplicates.
1432 : * (Since RestrictInfo nodes in different joinlists will have been
1433 : * multiply-linked rather than copied, pointer equality should be
1434 : * a sufficient test.)
1435 : */
1436 125240 : new_joininfo = list_append_unique_ptr(new_joininfo, rinfo);
1437 : }
1438 : }
1439 :
1440 362032 : return new_joininfo;
1441 : }
1442 :
1443 :
1444 : /*
1445 : * fetch_upper_rel
1446 : * Build a RelOptInfo describing some post-scan/join query processing,
1447 : * or return a pre-existing one if somebody already built it.
1448 : *
1449 : * An "upper" relation is identified by an UpperRelationKind and a Relids set.
1450 : * The meaning of the Relids set is not specified here, and very likely will
1451 : * vary for different relation kinds.
1452 : *
1453 : * Most of the fields in an upper-level RelOptInfo are not used and are not
1454 : * set here (though makeNode should ensure they're zeroes). We basically only
1455 : * care about fields that are of interest to add_path() and set_cheapest().
1456 : */
1457 : RelOptInfo *
1458 1679676 : fetch_upper_rel(PlannerInfo *root, UpperRelationKind kind, Relids relids)
1459 : {
1460 : RelOptInfo *upperrel;
1461 : ListCell *lc;
1462 :
1463 : /*
1464 : * For the moment, our indexing data structure is just a List for each
1465 : * relation kind. If we ever get so many of one kind that this stops
1466 : * working well, we can improve it. No code outside this function should
1467 : * assume anything about how to find a particular upperrel.
1468 : */
1469 :
1470 : /* If we already made this upperrel for the query, return it */
1471 1686618 : foreach(lc, root->upper_rels[kind])
1472 : {
1473 1065568 : upperrel = (RelOptInfo *) lfirst(lc);
1474 :
1475 1065568 : if (bms_equal(upperrel->relids, relids))
1476 1058626 : return upperrel;
1477 : }
1478 :
1479 621050 : upperrel = makeNode(RelOptInfo);
1480 621050 : upperrel->reloptkind = RELOPT_UPPER_REL;
1481 621050 : upperrel->relids = bms_copy(relids);
1482 :
1483 : /* cheap startup cost is interesting iff not all tuples to be retrieved */
1484 621050 : upperrel->consider_startup = (root->tuple_fraction > 0);
1485 621050 : upperrel->consider_param_startup = false;
1486 621050 : upperrel->consider_parallel = false; /* might get changed later */
1487 621050 : upperrel->reltarget = create_empty_pathtarget();
1488 621050 : upperrel->pathlist = NIL;
1489 621050 : upperrel->cheapest_startup_path = NULL;
1490 621050 : upperrel->cheapest_total_path = NULL;
1491 621050 : upperrel->cheapest_unique_path = NULL;
1492 621050 : upperrel->cheapest_parameterized_paths = NIL;
1493 :
1494 621050 : root->upper_rels[kind] = lappend(root->upper_rels[kind], upperrel);
1495 :
1496 621050 : return upperrel;
1497 : }
1498 :
1499 :
1500 : /*
1501 : * find_childrel_parents
1502 : * Compute the set of parent relids of an appendrel child rel.
1503 : *
1504 : * Since appendrels can be nested, a child could have multiple levels of
1505 : * appendrel ancestors. This function computes a Relids set of all the
1506 : * parent relation IDs.
1507 : */
1508 : Relids
1509 11342 : find_childrel_parents(PlannerInfo *root, RelOptInfo *rel)
1510 : {
1511 11342 : Relids result = NULL;
1512 :
1513 : Assert(rel->reloptkind == RELOPT_OTHER_MEMBER_REL);
1514 : Assert(rel->relid > 0 && rel->relid < root->simple_rel_array_size);
1515 :
1516 : do
1517 : {
1518 13426 : AppendRelInfo *appinfo = root->append_rel_array[rel->relid];
1519 13426 : Index prelid = appinfo->parent_relid;
1520 :
1521 13426 : result = bms_add_member(result, prelid);
1522 :
1523 : /* traverse up to the parent rel, loop if it's also a child rel */
1524 13426 : rel = find_base_rel(root, prelid);
1525 13426 : } while (rel->reloptkind == RELOPT_OTHER_MEMBER_REL);
1526 :
1527 : Assert(rel->reloptkind == RELOPT_BASEREL);
1528 :
1529 11342 : return result;
1530 : }
1531 :
1532 :
1533 : /*
1534 : * get_baserel_parampathinfo
1535 : * Get the ParamPathInfo for a parameterized path for a base relation,
1536 : * constructing one if we don't have one already.
1537 : *
1538 : * This centralizes estimating the rowcounts for parameterized paths.
1539 : * We need to cache those to be sure we use the same rowcount for all paths
1540 : * of the same parameterization for a given rel. This is also a convenient
1541 : * place to determine which movable join clauses the parameterized path will
1542 : * be responsible for evaluating.
1543 : */
1544 : ParamPathInfo *
1545 1581944 : get_baserel_parampathinfo(PlannerInfo *root, RelOptInfo *baserel,
1546 : Relids required_outer)
1547 : {
1548 : ParamPathInfo *ppi;
1549 : Relids joinrelids;
1550 : List *pclauses;
1551 : List *eqclauses;
1552 : Bitmapset *pserials;
1553 : double rows;
1554 : ListCell *lc;
1555 :
1556 : /* If rel has LATERAL refs, every path for it should account for them */
1557 : Assert(bms_is_subset(baserel->lateral_relids, required_outer));
1558 :
1559 : /* Unparameterized paths have no ParamPathInfo */
1560 1581944 : if (bms_is_empty(required_outer))
1561 1302692 : return NULL;
1562 :
1563 : Assert(!bms_overlap(baserel->relids, required_outer));
1564 :
1565 : /* If we already have a PPI for this parameterization, just return it */
1566 279252 : if ((ppi = find_param_path_info(baserel, required_outer)))
1567 147618 : return ppi;
1568 :
1569 : /*
1570 : * Identify all joinclauses that are movable to this base rel given this
1571 : * parameterization.
1572 : */
1573 131634 : joinrelids = bms_union(baserel->relids, required_outer);
1574 131634 : pclauses = NIL;
1575 216458 : foreach(lc, baserel->joininfo)
1576 : {
1577 84824 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1578 :
1579 84824 : if (join_clause_is_movable_into(rinfo,
1580 : baserel->relids,
1581 : joinrelids))
1582 35974 : pclauses = lappend(pclauses, rinfo);
1583 : }
1584 :
1585 : /*
1586 : * Add in joinclauses generated by EquivalenceClasses, too. (These
1587 : * necessarily satisfy join_clause_is_movable_into; but in assert-enabled
1588 : * builds, let's verify that.)
1589 : */
1590 131634 : eqclauses = generate_join_implied_equalities(root,
1591 : joinrelids,
1592 : required_outer,
1593 : baserel,
1594 : NULL);
1595 : #ifdef USE_ASSERT_CHECKING
1596 : foreach(lc, eqclauses)
1597 : {
1598 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1599 :
1600 : Assert(join_clause_is_movable_into(rinfo,
1601 : baserel->relids,
1602 : joinrelids));
1603 : }
1604 : #endif
1605 131634 : pclauses = list_concat(pclauses, eqclauses);
1606 :
1607 : /* Compute set of serial numbers of the enforced clauses */
1608 131634 : pserials = NULL;
1609 263788 : foreach(lc, pclauses)
1610 : {
1611 132154 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1612 :
1613 132154 : pserials = bms_add_member(pserials, rinfo->rinfo_serial);
1614 : }
1615 :
1616 : /* Estimate the number of rows returned by the parameterized scan */
1617 131634 : rows = get_parameterized_baserel_size(root, baserel, pclauses);
1618 :
1619 : /* And now we can build the ParamPathInfo */
1620 131634 : ppi = makeNode(ParamPathInfo);
1621 131634 : ppi->ppi_req_outer = required_outer;
1622 131634 : ppi->ppi_rows = rows;
1623 131634 : ppi->ppi_clauses = pclauses;
1624 131634 : ppi->ppi_serials = pserials;
1625 131634 : baserel->ppilist = lappend(baserel->ppilist, ppi);
1626 :
1627 131634 : return ppi;
1628 : }
1629 :
1630 : /*
1631 : * get_joinrel_parampathinfo
1632 : * Get the ParamPathInfo for a parameterized path for a join relation,
1633 : * constructing one if we don't have one already.
1634 : *
1635 : * This centralizes estimating the rowcounts for parameterized paths.
1636 : * We need to cache those to be sure we use the same rowcount for all paths
1637 : * of the same parameterization for a given rel. This is also a convenient
1638 : * place to determine which movable join clauses the parameterized path will
1639 : * be responsible for evaluating.
1640 : *
1641 : * outer_path and inner_path are a pair of input paths that can be used to
1642 : * construct the join, and restrict_clauses is the list of regular join
1643 : * clauses (including clauses derived from EquivalenceClasses) that must be
1644 : * applied at the join node when using these inputs.
1645 : *
1646 : * Unlike the situation for base rels, the set of movable join clauses to be
1647 : * enforced at a join varies with the selected pair of input paths, so we
1648 : * must calculate that and pass it back, even if we already have a matching
1649 : * ParamPathInfo. We handle this by adding any clauses moved down to this
1650 : * join to *restrict_clauses, which is an in/out parameter. (The addition
1651 : * is done in such a way as to not modify the passed-in List structure.)
1652 : *
1653 : * Note: when considering a nestloop join, the caller must have removed from
1654 : * restrict_clauses any movable clauses that are themselves scheduled to be
1655 : * pushed into the right-hand path. We do not do that here since it's
1656 : * unnecessary for other join types.
1657 : */
1658 : ParamPathInfo *
1659 1657026 : get_joinrel_parampathinfo(PlannerInfo *root, RelOptInfo *joinrel,
1660 : Path *outer_path,
1661 : Path *inner_path,
1662 : SpecialJoinInfo *sjinfo,
1663 : Relids required_outer,
1664 : List **restrict_clauses)
1665 : {
1666 : ParamPathInfo *ppi;
1667 : Relids join_and_req;
1668 : Relids outer_and_req;
1669 : Relids inner_and_req;
1670 : List *pclauses;
1671 : List *eclauses;
1672 : List *dropped_ecs;
1673 : double rows;
1674 : ListCell *lc;
1675 :
1676 : /* If rel has LATERAL refs, every path for it should account for them */
1677 : Assert(bms_is_subset(joinrel->lateral_relids, required_outer));
1678 :
1679 : /* Unparameterized paths have no ParamPathInfo or extra join clauses */
1680 1657026 : if (bms_is_empty(required_outer))
1681 1630124 : return NULL;
1682 :
1683 : Assert(!bms_overlap(joinrel->relids, required_outer));
1684 :
1685 : /*
1686 : * Identify all joinclauses that are movable to this join rel given this
1687 : * parameterization. These are the clauses that are movable into this
1688 : * join, but not movable into either input path. Treat an unparameterized
1689 : * input path as not accepting parameterized clauses (because it won't,
1690 : * per the shortcut exit above), even though the joinclause movement rules
1691 : * might allow the same clauses to be moved into a parameterized path for
1692 : * that rel.
1693 : */
1694 26902 : join_and_req = bms_union(joinrel->relids, required_outer);
1695 26902 : if (outer_path->param_info)
1696 24778 : outer_and_req = bms_union(outer_path->parent->relids,
1697 24778 : PATH_REQ_OUTER(outer_path));
1698 : else
1699 2124 : outer_and_req = NULL; /* outer path does not accept parameters */
1700 26902 : if (inner_path->param_info)
1701 14018 : inner_and_req = bms_union(inner_path->parent->relids,
1702 14018 : PATH_REQ_OUTER(inner_path));
1703 : else
1704 12884 : inner_and_req = NULL; /* inner path does not accept parameters */
1705 :
1706 26902 : pclauses = NIL;
1707 70090 : foreach(lc, joinrel->joininfo)
1708 : {
1709 43188 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1710 :
1711 43188 : if (join_clause_is_movable_into(rinfo,
1712 : joinrel->relids,
1713 21634 : join_and_req) &&
1714 21634 : !join_clause_is_movable_into(rinfo,
1715 21634 : outer_path->parent->relids,
1716 704 : outer_and_req) &&
1717 704 : !join_clause_is_movable_into(rinfo,
1718 704 : inner_path->parent->relids,
1719 : inner_and_req))
1720 96 : pclauses = lappend(pclauses, rinfo);
1721 : }
1722 :
1723 : /* Consider joinclauses generated by EquivalenceClasses, too */
1724 26902 : eclauses = generate_join_implied_equalities(root,
1725 : join_and_req,
1726 : required_outer,
1727 : joinrel,
1728 : NULL);
1729 : /* We only want ones that aren't movable to lower levels */
1730 26902 : dropped_ecs = NIL;
1731 30640 : foreach(lc, eclauses)
1732 : {
1733 3738 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1734 :
1735 : Assert(join_clause_is_movable_into(rinfo,
1736 : joinrel->relids,
1737 : join_and_req));
1738 3738 : if (join_clause_is_movable_into(rinfo,
1739 3738 : outer_path->parent->relids,
1740 : outer_and_req))
1741 2108 : continue; /* drop if movable into LHS */
1742 1630 : if (join_clause_is_movable_into(rinfo,
1743 1630 : inner_path->parent->relids,
1744 : inner_and_req))
1745 : {
1746 : /* drop if movable into RHS, but remember EC for use below */
1747 : Assert(rinfo->left_ec == rinfo->right_ec);
1748 948 : dropped_ecs = lappend(dropped_ecs, rinfo->left_ec);
1749 948 : continue;
1750 : }
1751 682 : pclauses = lappend(pclauses, rinfo);
1752 : }
1753 :
1754 : /*
1755 : * EquivalenceClasses are harder to deal with than we could wish, because
1756 : * of the fact that a given EC can generate different clauses depending on
1757 : * context. Suppose we have an EC {X.X, Y.Y, Z.Z} where X and Y are the
1758 : * LHS and RHS of the current join and Z is in required_outer, and further
1759 : * suppose that the inner_path is parameterized by both X and Z. The code
1760 : * above will have produced either Z.Z = X.X or Z.Z = Y.Y from that EC,
1761 : * and in the latter case will have discarded it as being movable into the
1762 : * RHS. However, the EC machinery might have produced either Y.Y = X.X or
1763 : * Y.Y = Z.Z as the EC enforcement clause within the inner_path; it will
1764 : * not have produced both, and we can't readily tell from here which one
1765 : * it did pick. If we add no clause to this join, we'll end up with
1766 : * insufficient enforcement of the EC; either Z.Z or X.X will fail to be
1767 : * constrained to be equal to the other members of the EC. (When we come
1768 : * to join Z to this X/Y path, we will certainly drop whichever EC clause
1769 : * is generated at that join, so this omission won't get fixed later.)
1770 : *
1771 : * To handle this, for each EC we discarded such a clause from, try to
1772 : * generate a clause connecting the required_outer rels to the join's LHS
1773 : * ("Z.Z = X.X" in the terms of the above example). If successful, and if
1774 : * the clause can't be moved to the LHS, add it to the current join's
1775 : * restriction clauses. (If an EC cannot generate such a clause then it
1776 : * has nothing that needs to be enforced here, while if the clause can be
1777 : * moved into the LHS then it should have been enforced within that path.)
1778 : *
1779 : * Note that we don't need similar processing for ECs whose clause was
1780 : * considered to be movable into the LHS, because the LHS can't refer to
1781 : * the RHS so there is no comparable ambiguity about what it might
1782 : * actually be enforcing internally.
1783 : */
1784 26902 : if (dropped_ecs)
1785 : {
1786 : Relids real_outer_and_req;
1787 :
1788 900 : real_outer_and_req = bms_union(outer_path->parent->relids,
1789 : required_outer);
1790 : eclauses =
1791 900 : generate_join_implied_equalities_for_ecs(root,
1792 : dropped_ecs,
1793 : real_outer_and_req,
1794 : required_outer,
1795 : outer_path->parent);
1796 986 : foreach(lc, eclauses)
1797 : {
1798 86 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1799 :
1800 : Assert(join_clause_is_movable_into(rinfo,
1801 : outer_path->parent->relids,
1802 : real_outer_and_req));
1803 86 : if (!join_clause_is_movable_into(rinfo,
1804 86 : outer_path->parent->relids,
1805 : outer_and_req))
1806 74 : pclauses = lappend(pclauses, rinfo);
1807 : }
1808 : }
1809 :
1810 : /*
1811 : * Now, attach the identified moved-down clauses to the caller's
1812 : * restrict_clauses list. By using list_concat in this order, we leave
1813 : * the original list structure of restrict_clauses undamaged.
1814 : */
1815 26902 : *restrict_clauses = list_concat(pclauses, *restrict_clauses);
1816 :
1817 : /* If we already have a PPI for this parameterization, just return it */
1818 26902 : if ((ppi = find_param_path_info(joinrel, required_outer)))
1819 19982 : return ppi;
1820 :
1821 : /* Estimate the number of rows returned by the parameterized join */
1822 6920 : rows = get_parameterized_joinrel_size(root, joinrel,
1823 : outer_path,
1824 : inner_path,
1825 : sjinfo,
1826 : *restrict_clauses);
1827 :
1828 : /*
1829 : * And now we can build the ParamPathInfo. No point in saving the
1830 : * input-pair-dependent clause list, though.
1831 : *
1832 : * Note: in GEQO mode, we'll be called in a temporary memory context, but
1833 : * the joinrel structure is there too, so no problem.
1834 : */
1835 6920 : ppi = makeNode(ParamPathInfo);
1836 6920 : ppi->ppi_req_outer = required_outer;
1837 6920 : ppi->ppi_rows = rows;
1838 6920 : ppi->ppi_clauses = NIL;
1839 6920 : ppi->ppi_serials = NULL;
1840 6920 : joinrel->ppilist = lappend(joinrel->ppilist, ppi);
1841 :
1842 6920 : return ppi;
1843 : }
1844 :
1845 : /*
1846 : * get_appendrel_parampathinfo
1847 : * Get the ParamPathInfo for a parameterized path for an append relation.
1848 : *
1849 : * For an append relation, the rowcount estimate will just be the sum of
1850 : * the estimates for its children. However, we still need a ParamPathInfo
1851 : * to flag the fact that the path requires parameters. So this just creates
1852 : * a suitable struct with zero ppi_rows (and no ppi_clauses either, since
1853 : * the Append node isn't responsible for checking quals).
1854 : */
1855 : ParamPathInfo *
1856 37106 : get_appendrel_parampathinfo(RelOptInfo *appendrel, Relids required_outer)
1857 : {
1858 : ParamPathInfo *ppi;
1859 :
1860 : /* If rel has LATERAL refs, every path for it should account for them */
1861 : Assert(bms_is_subset(appendrel->lateral_relids, required_outer));
1862 :
1863 : /* Unparameterized paths have no ParamPathInfo */
1864 37106 : if (bms_is_empty(required_outer))
1865 36568 : return NULL;
1866 :
1867 : Assert(!bms_overlap(appendrel->relids, required_outer));
1868 :
1869 : /* If we already have a PPI for this parameterization, just return it */
1870 538 : if ((ppi = find_param_path_info(appendrel, required_outer)))
1871 126 : return ppi;
1872 :
1873 : /* Else build the ParamPathInfo */
1874 412 : ppi = makeNode(ParamPathInfo);
1875 412 : ppi->ppi_req_outer = required_outer;
1876 412 : ppi->ppi_rows = 0;
1877 412 : ppi->ppi_clauses = NIL;
1878 412 : ppi->ppi_serials = NULL;
1879 412 : appendrel->ppilist = lappend(appendrel->ppilist, ppi);
1880 :
1881 412 : return ppi;
1882 : }
1883 :
1884 : /*
1885 : * Returns a ParamPathInfo for the parameterization given by required_outer, if
1886 : * already available in the given rel. Returns NULL otherwise.
1887 : */
1888 : ParamPathInfo *
1889 307580 : find_param_path_info(RelOptInfo *rel, Relids required_outer)
1890 : {
1891 : ListCell *lc;
1892 :
1893 355214 : foreach(lc, rel->ppilist)
1894 : {
1895 215468 : ParamPathInfo *ppi = (ParamPathInfo *) lfirst(lc);
1896 :
1897 215468 : if (bms_equal(ppi->ppi_req_outer, required_outer))
1898 167834 : return ppi;
1899 : }
1900 :
1901 139746 : return NULL;
1902 : }
1903 :
1904 : /*
1905 : * get_param_path_clause_serials
1906 : * Given a parameterized Path, return the set of pushed-down clauses
1907 : * (identified by rinfo_serial numbers) enforced within the Path.
1908 : */
1909 : Bitmapset *
1910 333888 : get_param_path_clause_serials(Path *path)
1911 : {
1912 333888 : if (path->param_info == NULL)
1913 944 : return NULL; /* not parameterized */
1914 :
1915 : /*
1916 : * We don't currently support parameterized MergeAppend paths, as
1917 : * explained in the comments for generate_orderedappend_paths.
1918 : */
1919 : Assert(!IsA(path, MergeAppendPath));
1920 :
1921 332944 : if (IsA(path, NestPath) ||
1922 326532 : IsA(path, MergePath) ||
1923 326526 : IsA(path, HashPath))
1924 : {
1925 : /*
1926 : * For a join path, combine clauses enforced within either input path
1927 : * with those enforced as joinrestrictinfo in this path. Note that
1928 : * joinrestrictinfo may include some non-pushed-down clauses, but for
1929 : * current purposes it's okay if we include those in the result. (To
1930 : * be more careful, we could check for clause_relids overlapping the
1931 : * path parameterization, but it's not worth the cycles for now.)
1932 : */
1933 7234 : JoinPath *jpath = (JoinPath *) path;
1934 : Bitmapset *pserials;
1935 : ListCell *lc;
1936 :
1937 7234 : pserials = NULL;
1938 7234 : pserials = bms_add_members(pserials,
1939 7234 : get_param_path_clause_serials(jpath->outerjoinpath));
1940 7234 : pserials = bms_add_members(pserials,
1941 7234 : get_param_path_clause_serials(jpath->innerjoinpath));
1942 8866 : foreach(lc, jpath->joinrestrictinfo)
1943 : {
1944 1632 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1945 :
1946 1632 : pserials = bms_add_member(pserials, rinfo->rinfo_serial);
1947 : }
1948 7234 : return pserials;
1949 : }
1950 325710 : else if (IsA(path, AppendPath))
1951 : {
1952 : /*
1953 : * For an appendrel, take the intersection of the sets of clauses
1954 : * enforced in each input path.
1955 : */
1956 2114 : AppendPath *apath = (AppendPath *) path;
1957 : Bitmapset *pserials;
1958 : ListCell *lc;
1959 :
1960 2114 : pserials = NULL;
1961 8822 : foreach(lc, apath->subpaths)
1962 : {
1963 6708 : Path *subpath = (Path *) lfirst(lc);
1964 : Bitmapset *subserials;
1965 :
1966 6708 : subserials = get_param_path_clause_serials(subpath);
1967 6708 : if (lc == list_head(apath->subpaths))
1968 2090 : pserials = bms_copy(subserials);
1969 : else
1970 4618 : pserials = bms_int_members(pserials, subserials);
1971 : }
1972 2114 : return pserials;
1973 : }
1974 : else
1975 : {
1976 : /*
1977 : * Otherwise, it's a baserel path and we can use the
1978 : * previously-computed set of serial numbers.
1979 : */
1980 323596 : return path->param_info->ppi_serials;
1981 : }
1982 : }
1983 :
1984 : /*
1985 : * build_joinrel_partition_info
1986 : * Checks if the two relations being joined can use partitionwise join
1987 : * and if yes, initialize partitioning information of the resulting
1988 : * partitioned join relation.
1989 : */
1990 : static void
1991 185790 : build_joinrel_partition_info(PlannerInfo *root,
1992 : RelOptInfo *joinrel, RelOptInfo *outer_rel,
1993 : RelOptInfo *inner_rel, SpecialJoinInfo *sjinfo,
1994 : List *restrictlist)
1995 : {
1996 : PartitionScheme part_scheme;
1997 :
1998 : /* Nothing to do if partitionwise join technique is disabled. */
1999 185790 : if (!enable_partitionwise_join)
2000 : {
2001 : Assert(!IS_PARTITIONED_REL(joinrel));
2002 179022 : return;
2003 : }
2004 :
2005 : /*
2006 : * We can only consider this join as an input to further partitionwise
2007 : * joins if (a) the input relations are partitioned and have
2008 : * consider_partitionwise_join=true, (b) the partition schemes match, and
2009 : * (c) we can identify an equi-join between the partition keys. Note that
2010 : * if it were possible for have_partkey_equi_join to return different
2011 : * answers for the same joinrel depending on which join ordering we try
2012 : * first, this logic would break. That shouldn't happen, though, because
2013 : * of the way the query planner deduces implied equalities and reorders
2014 : * the joins. Please see optimizer/README for details.
2015 : */
2016 6768 : if (outer_rel->part_scheme == NULL || inner_rel->part_scheme == NULL ||
2017 2228 : !outer_rel->consider_partitionwise_join ||
2018 2184 : !inner_rel->consider_partitionwise_join ||
2019 2148 : outer_rel->part_scheme != inner_rel->part_scheme ||
2020 2124 : !have_partkey_equi_join(root, joinrel, outer_rel, inner_rel,
2021 : sjinfo->jointype, restrictlist))
2022 : {
2023 : Assert(!IS_PARTITIONED_REL(joinrel));
2024 4812 : return;
2025 : }
2026 :
2027 1956 : part_scheme = outer_rel->part_scheme;
2028 :
2029 : /*
2030 : * This function will be called only once for each joinrel, hence it
2031 : * should not have partitioning fields filled yet.
2032 : */
2033 : Assert(!joinrel->part_scheme && !joinrel->partexprs &&
2034 : !joinrel->nullable_partexprs && !joinrel->part_rels &&
2035 : !joinrel->boundinfo);
2036 :
2037 : /*
2038 : * If the join relation is partitioned, it uses the same partitioning
2039 : * scheme as the joining relations.
2040 : *
2041 : * Note: we calculate the partition bounds, number of partitions, and
2042 : * child-join relations of the join relation in try_partitionwise_join().
2043 : */
2044 1956 : joinrel->part_scheme = part_scheme;
2045 1956 : set_joinrel_partition_key_exprs(joinrel, outer_rel, inner_rel,
2046 : sjinfo->jointype);
2047 :
2048 : /*
2049 : * Set the consider_partitionwise_join flag.
2050 : */
2051 : Assert(outer_rel->consider_partitionwise_join);
2052 : Assert(inner_rel->consider_partitionwise_join);
2053 1956 : joinrel->consider_partitionwise_join = true;
2054 : }
2055 :
2056 : /*
2057 : * have_partkey_equi_join
2058 : *
2059 : * Returns true if there exist equi-join conditions involving pairs
2060 : * of matching partition keys of the relations being joined for all
2061 : * partition keys.
2062 : */
2063 : static bool
2064 2124 : have_partkey_equi_join(PlannerInfo *root, RelOptInfo *joinrel,
2065 : RelOptInfo *rel1, RelOptInfo *rel2,
2066 : JoinType jointype, List *restrictlist)
2067 : {
2068 2124 : PartitionScheme part_scheme = rel1->part_scheme;
2069 : bool pk_known_equal[PARTITION_MAX_KEYS];
2070 : int num_equal_pks;
2071 : ListCell *lc;
2072 :
2073 : /*
2074 : * This function must only be called when the joined relations have same
2075 : * partitioning scheme.
2076 : */
2077 : Assert(rel1->part_scheme == rel2->part_scheme);
2078 : Assert(part_scheme);
2079 :
2080 : /* We use a bool array to track which partkey columns are known equal */
2081 2124 : memset(pk_known_equal, 0, sizeof(pk_known_equal));
2082 : /* ... as well as a count of how many are known equal */
2083 2124 : num_equal_pks = 0;
2084 :
2085 : /* First, look through the join's restriction clauses */
2086 3342 : foreach(lc, restrictlist)
2087 : {
2088 3144 : RestrictInfo *rinfo = lfirst_node(RestrictInfo, lc);
2089 : OpExpr *opexpr;
2090 : Expr *expr1;
2091 : Expr *expr2;
2092 : bool strict_op;
2093 : int ipk1;
2094 : int ipk2;
2095 :
2096 : /* If processing an outer join, only use its own join clauses. */
2097 3144 : if (IS_OUTER_JOIN(jointype) &&
2098 1652 : RINFO_IS_PUSHED_DOWN(rinfo, joinrel->relids))
2099 246 : continue;
2100 :
2101 : /* Skip clauses which can not be used for a join. */
2102 2898 : if (!rinfo->can_join)
2103 18 : continue;
2104 :
2105 : /* Skip clauses which are not equality conditions. */
2106 2880 : if (!rinfo->mergeopfamilies && !OidIsValid(rinfo->hashjoinoperator))
2107 6 : continue;
2108 :
2109 : /* Should be OK to assume it's an OpExpr. */
2110 2874 : opexpr = castNode(OpExpr, rinfo->clause);
2111 :
2112 : /* Match the operands to the relation. */
2113 5598 : if (bms_is_subset(rinfo->left_relids, rel1->relids) &&
2114 2724 : bms_is_subset(rinfo->right_relids, rel2->relids))
2115 : {
2116 2724 : expr1 = linitial(opexpr->args);
2117 2724 : expr2 = lsecond(opexpr->args);
2118 : }
2119 300 : else if (bms_is_subset(rinfo->left_relids, rel2->relids) &&
2120 150 : bms_is_subset(rinfo->right_relids, rel1->relids))
2121 : {
2122 150 : expr1 = lsecond(opexpr->args);
2123 150 : expr2 = linitial(opexpr->args);
2124 : }
2125 : else
2126 0 : continue;
2127 :
2128 : /*
2129 : * Now we need to know whether the join operator is strict; see
2130 : * comments in pathnodes.h.
2131 : */
2132 2874 : strict_op = op_strict(opexpr->opno);
2133 :
2134 : /*
2135 : * Vars appearing in the relation's partition keys will not have any
2136 : * varnullingrels, but those in expr1 and expr2 will if we're above
2137 : * outer joins that could null the respective rels. It's okay to
2138 : * match anyway, if the join operator is strict.
2139 : */
2140 2874 : if (strict_op)
2141 : {
2142 2874 : if (bms_overlap(rel1->relids, root->outer_join_rels))
2143 180 : expr1 = (Expr *) remove_nulling_relids((Node *) expr1,
2144 180 : root->outer_join_rels,
2145 : NULL);
2146 2874 : if (bms_overlap(rel2->relids, root->outer_join_rels))
2147 0 : expr2 = (Expr *) remove_nulling_relids((Node *) expr2,
2148 0 : root->outer_join_rels,
2149 : NULL);
2150 : }
2151 :
2152 : /*
2153 : * Only clauses referencing the partition keys are useful for
2154 : * partitionwise join.
2155 : */
2156 2874 : ipk1 = match_expr_to_partition_keys(expr1, rel1, strict_op);
2157 2874 : if (ipk1 < 0)
2158 876 : continue;
2159 1998 : ipk2 = match_expr_to_partition_keys(expr2, rel2, strict_op);
2160 1998 : if (ipk2 < 0)
2161 48 : continue;
2162 :
2163 : /*
2164 : * If the clause refers to keys at different ordinal positions, it can
2165 : * not be used for partitionwise join.
2166 : */
2167 1950 : if (ipk1 != ipk2)
2168 6 : continue;
2169 :
2170 : /* Ignore clause if we already proved these keys equal. */
2171 1944 : if (pk_known_equal[ipk1])
2172 0 : continue;
2173 :
2174 : /* Reject if the partition key collation differs from the clause's. */
2175 1944 : if (rel1->part_scheme->partcollation[ipk1] != opexpr->inputcollid)
2176 1926 : return false;
2177 :
2178 : /*
2179 : * The clause allows partitionwise join only if it uses the same
2180 : * operator family as that specified by the partition key.
2181 : */
2182 1932 : if (part_scheme->strategy == PARTITION_STRATEGY_HASH)
2183 : {
2184 48 : if (!OidIsValid(rinfo->hashjoinoperator) ||
2185 48 : !op_in_opfamily(rinfo->hashjoinoperator,
2186 48 : part_scheme->partopfamily[ipk1]))
2187 0 : continue;
2188 : }
2189 1884 : else if (!list_member_oid(rinfo->mergeopfamilies,
2190 1884 : part_scheme->partopfamily[ipk1]))
2191 0 : continue;
2192 :
2193 : /* Mark the partition key as having an equi-join clause. */
2194 1932 : pk_known_equal[ipk1] = true;
2195 :
2196 : /* We can stop examining clauses once we prove all keys equal. */
2197 1932 : if (++num_equal_pks == part_scheme->partnatts)
2198 1914 : return true;
2199 : }
2200 :
2201 : /*
2202 : * Also check to see if any keys are known equal by equivclass.c. In most
2203 : * cases there would have been a join restriction clause generated from
2204 : * any EC that had such knowledge, but there might be no such clause, or
2205 : * it might happen to constrain other members of the ECs than the ones we
2206 : * are looking for.
2207 : */
2208 204 : for (int ipk = 0; ipk < part_scheme->partnatts; ipk++)
2209 : {
2210 : Oid btree_opfamily;
2211 :
2212 : /* Ignore if we already proved these keys equal. */
2213 204 : if (pk_known_equal[ipk])
2214 6 : continue;
2215 :
2216 : /*
2217 : * We need a btree opfamily to ask equivclass.c about. If the
2218 : * partopfamily is a hash opfamily, look up its equality operator, and
2219 : * select some btree opfamily that that operator is part of. (Any
2220 : * such opfamily should be good enough, since equivclass.c will track
2221 : * multiple opfamilies as appropriate.)
2222 : */
2223 198 : if (part_scheme->strategy == PARTITION_STRATEGY_HASH)
2224 : {
2225 : Oid eq_op;
2226 : List *eq_opfamilies;
2227 :
2228 0 : eq_op = get_opfamily_member(part_scheme->partopfamily[ipk],
2229 0 : part_scheme->partopcintype[ipk],
2230 0 : part_scheme->partopcintype[ipk],
2231 : HTEqualStrategyNumber);
2232 0 : if (!OidIsValid(eq_op))
2233 0 : break; /* we're not going to succeed */
2234 0 : eq_opfamilies = get_mergejoin_opfamilies(eq_op);
2235 0 : if (eq_opfamilies == NIL)
2236 0 : break; /* we're not going to succeed */
2237 0 : btree_opfamily = linitial_oid(eq_opfamilies);
2238 : }
2239 : else
2240 198 : btree_opfamily = part_scheme->partopfamily[ipk];
2241 :
2242 : /*
2243 : * We consider only non-nullable partition keys here; nullable ones
2244 : * would not be treated as part of the same equivalence classes as
2245 : * non-nullable ones.
2246 : */
2247 354 : foreach(lc, rel1->partexprs[ipk])
2248 : {
2249 198 : Node *expr1 = (Node *) lfirst(lc);
2250 : ListCell *lc2;
2251 198 : Oid partcoll1 = rel1->part_scheme->partcollation[ipk];
2252 198 : Oid exprcoll1 = exprCollation(expr1);
2253 :
2254 366 : foreach(lc2, rel2->partexprs[ipk])
2255 : {
2256 210 : Node *expr2 = (Node *) lfirst(lc2);
2257 :
2258 210 : if (exprs_known_equal(root, expr1, expr2, btree_opfamily))
2259 : {
2260 : /*
2261 : * Ensure that the collation of the expression matches
2262 : * that of the partition key. Checking just one collation
2263 : * (partcoll1 and exprcoll1) suffices because partcoll1
2264 : * and partcoll2, as well as exprcoll1 and exprcoll2,
2265 : * should be identical. This holds because both rel1 and
2266 : * rel2 use the same PartitionScheme and expr1 and expr2
2267 : * are equal.
2268 : */
2269 54 : if (partcoll1 == exprcoll1)
2270 : {
2271 42 : Oid partcoll2 PG_USED_FOR_ASSERTS_ONLY =
2272 42 : rel2->part_scheme->partcollation[ipk];
2273 : Oid exprcoll2 PG_USED_FOR_ASSERTS_ONLY =
2274 42 : exprCollation(expr2);
2275 :
2276 : Assert(partcoll2 == exprcoll2);
2277 42 : pk_known_equal[ipk] = true;
2278 42 : break;
2279 : }
2280 : }
2281 : }
2282 198 : if (pk_known_equal[ipk])
2283 42 : break;
2284 : }
2285 :
2286 198 : if (pk_known_equal[ipk])
2287 : {
2288 : /* We can stop examining keys once we prove all keys equal. */
2289 42 : if (++num_equal_pks == part_scheme->partnatts)
2290 42 : return true;
2291 : }
2292 : else
2293 156 : break; /* no chance to succeed, give up */
2294 : }
2295 :
2296 156 : return false;
2297 : }
2298 :
2299 : /*
2300 : * match_expr_to_partition_keys
2301 : *
2302 : * Tries to match an expression to one of the nullable or non-nullable
2303 : * partition keys of "rel". Returns the matched key's ordinal position,
2304 : * or -1 if the expression could not be matched to any of the keys.
2305 : *
2306 : * strict_op must be true if the expression will be compared with the
2307 : * partition key using a strict operator. This allows us to consider
2308 : * nullable as well as nonnullable partition keys.
2309 : */
2310 : static int
2311 4872 : match_expr_to_partition_keys(Expr *expr, RelOptInfo *rel, bool strict_op)
2312 : {
2313 : int cnt;
2314 :
2315 : /* This function should be called only for partitioned relations. */
2316 : Assert(rel->part_scheme);
2317 : Assert(rel->partexprs);
2318 : Assert(rel->nullable_partexprs);
2319 :
2320 : /* Remove any relabel decorations. */
2321 5160 : while (IsA(expr, RelabelType))
2322 288 : expr = (Expr *) (castNode(RelabelType, expr))->arg;
2323 :
2324 5832 : for (cnt = 0; cnt < rel->part_scheme->partnatts; cnt++)
2325 : {
2326 : ListCell *lc;
2327 :
2328 : /* We can always match to the non-nullable partition keys. */
2329 5904 : foreach(lc, rel->partexprs[cnt])
2330 : {
2331 4860 : if (equal(lfirst(lc), expr))
2332 3864 : return cnt;
2333 : }
2334 :
2335 1044 : if (!strict_op)
2336 0 : continue;
2337 :
2338 : /*
2339 : * If it's a strict join operator then a NULL partition key on one
2340 : * side will not join to any partition key on the other side, and in
2341 : * particular such a row can't join to a row from a different
2342 : * partition on the other side. So, it's okay to search the nullable
2343 : * partition keys as well.
2344 : */
2345 1188 : foreach(lc, rel->nullable_partexprs[cnt])
2346 : {
2347 228 : if (equal(lfirst(lc), expr))
2348 84 : return cnt;
2349 : }
2350 : }
2351 :
2352 924 : return -1;
2353 : }
2354 :
2355 : /*
2356 : * set_joinrel_partition_key_exprs
2357 : * Initialize partition key expressions for a partitioned joinrel.
2358 : */
2359 : static void
2360 1956 : set_joinrel_partition_key_exprs(RelOptInfo *joinrel,
2361 : RelOptInfo *outer_rel, RelOptInfo *inner_rel,
2362 : JoinType jointype)
2363 : {
2364 1956 : PartitionScheme part_scheme = joinrel->part_scheme;
2365 1956 : int partnatts = part_scheme->partnatts;
2366 :
2367 1956 : joinrel->partexprs = (List **) palloc0(sizeof(List *) * partnatts);
2368 1956 : joinrel->nullable_partexprs =
2369 1956 : (List **) palloc0(sizeof(List *) * partnatts);
2370 :
2371 : /*
2372 : * The joinrel's partition expressions are the same as those of the input
2373 : * rels, but we must properly classify them as nullable or not in the
2374 : * joinrel's output. (Also, we add some more partition expressions if
2375 : * it's a FULL JOIN.)
2376 : */
2377 3924 : for (int cnt = 0; cnt < partnatts; cnt++)
2378 : {
2379 : /* mark these const to enforce that we copy them properly */
2380 1968 : const List *outer_expr = outer_rel->partexprs[cnt];
2381 1968 : const List *outer_null_expr = outer_rel->nullable_partexprs[cnt];
2382 1968 : const List *inner_expr = inner_rel->partexprs[cnt];
2383 1968 : const List *inner_null_expr = inner_rel->nullable_partexprs[cnt];
2384 1968 : List *partexpr = NIL;
2385 1968 : List *nullable_partexpr = NIL;
2386 : ListCell *lc;
2387 :
2388 1968 : switch (jointype)
2389 : {
2390 : /*
2391 : * A join relation resulting from an INNER join may be
2392 : * regarded as partitioned by either of the inner and outer
2393 : * relation keys. For example, A INNER JOIN B ON A.a = B.b
2394 : * can be regarded as partitioned on either A.a or B.b. So we
2395 : * add both keys to the joinrel's partexpr lists. However,
2396 : * anything that was already nullable still has to be treated
2397 : * as nullable.
2398 : */
2399 844 : case JOIN_INNER:
2400 844 : partexpr = list_concat_copy(outer_expr, inner_expr);
2401 844 : nullable_partexpr = list_concat_copy(outer_null_expr,
2402 : inner_null_expr);
2403 844 : break;
2404 :
2405 : /*
2406 : * A join relation resulting from a SEMI or ANTI join may be
2407 : * regarded as partitioned by the outer relation keys. The
2408 : * inner relation's keys are no longer interesting; since they
2409 : * aren't visible in the join output, nothing could join to
2410 : * them.
2411 : */
2412 264 : case JOIN_SEMI:
2413 : case JOIN_ANTI:
2414 264 : partexpr = list_copy(outer_expr);
2415 264 : nullable_partexpr = list_copy(outer_null_expr);
2416 264 : break;
2417 :
2418 : /*
2419 : * A join relation resulting from a LEFT OUTER JOIN likewise
2420 : * may be regarded as partitioned on the (non-nullable) outer
2421 : * relation keys. The inner (nullable) relation keys are okay
2422 : * as partition keys for further joins as long as they involve
2423 : * strict join operators.
2424 : */
2425 574 : case JOIN_LEFT:
2426 574 : partexpr = list_copy(outer_expr);
2427 574 : nullable_partexpr = list_concat_copy(inner_expr,
2428 : outer_null_expr);
2429 574 : nullable_partexpr = list_concat(nullable_partexpr,
2430 : inner_null_expr);
2431 574 : break;
2432 :
2433 : /*
2434 : * For FULL OUTER JOINs, both relations are nullable, so the
2435 : * resulting join relation may be regarded as partitioned on
2436 : * either of inner and outer relation keys, but only for joins
2437 : * that involve strict join operators.
2438 : */
2439 286 : case JOIN_FULL:
2440 286 : nullable_partexpr = list_concat_copy(outer_expr,
2441 : inner_expr);
2442 286 : nullable_partexpr = list_concat(nullable_partexpr,
2443 : outer_null_expr);
2444 286 : nullable_partexpr = list_concat(nullable_partexpr,
2445 : inner_null_expr);
2446 :
2447 : /*
2448 : * Also add CoalesceExprs corresponding to each possible
2449 : * full-join output variable (that is, left side coalesced to
2450 : * right side), so that we can match equijoin expressions
2451 : * using those variables. We really only need these for
2452 : * columns merged by JOIN USING, and only with the pairs of
2453 : * input items that correspond to the data structures that
2454 : * parse analysis would build for such variables. But it's
2455 : * hard to tell which those are, so just make all the pairs.
2456 : * Extra items in the nullable_partexprs list won't cause big
2457 : * problems. (It's possible that such items will get matched
2458 : * to user-written COALESCEs, but it should still be valid to
2459 : * partition on those, since they're going to be either the
2460 : * partition column or NULL; it's the same argument as for
2461 : * partitionwise nesting of any outer join.) We assume no
2462 : * type coercions are needed to make the coalesce expressions,
2463 : * since columns of different types won't have gotten
2464 : * classified as the same PartitionScheme. Note that we
2465 : * intentionally leave out the varnullingrels decoration that
2466 : * would ordinarily appear on the Vars inside these
2467 : * CoalesceExprs, because have_partkey_equi_join will strip
2468 : * varnullingrels from the expressions it will compare to the
2469 : * partexprs.
2470 : */
2471 728 : foreach(lc, list_concat_copy(outer_expr, outer_null_expr))
2472 : {
2473 442 : Node *larg = (Node *) lfirst(lc);
2474 : ListCell *lc2;
2475 :
2476 884 : foreach(lc2, list_concat_copy(inner_expr, inner_null_expr))
2477 : {
2478 442 : Node *rarg = (Node *) lfirst(lc2);
2479 442 : CoalesceExpr *c = makeNode(CoalesceExpr);
2480 :
2481 442 : c->coalescetype = exprType(larg);
2482 442 : c->coalescecollid = exprCollation(larg);
2483 442 : c->args = list_make2(larg, rarg);
2484 442 : c->location = -1;
2485 442 : nullable_partexpr = lappend(nullable_partexpr, c);
2486 : }
2487 : }
2488 286 : break;
2489 :
2490 0 : default:
2491 0 : elog(ERROR, "unrecognized join type: %d", (int) jointype);
2492 : }
2493 :
2494 1968 : joinrel->partexprs[cnt] = partexpr;
2495 1968 : joinrel->nullable_partexprs[cnt] = nullable_partexpr;
2496 : }
2497 1956 : }
2498 :
2499 : /*
2500 : * build_child_join_reltarget
2501 : * Set up a child-join relation's reltarget from a parent-join relation.
2502 : */
2503 : static void
2504 4774 : build_child_join_reltarget(PlannerInfo *root,
2505 : RelOptInfo *parentrel,
2506 : RelOptInfo *childrel,
2507 : int nappinfos,
2508 : AppendRelInfo **appinfos)
2509 : {
2510 : /* Build the targetlist */
2511 9548 : childrel->reltarget->exprs = (List *)
2512 4774 : adjust_appendrel_attrs(root,
2513 4774 : (Node *) parentrel->reltarget->exprs,
2514 : nappinfos, appinfos);
2515 :
2516 : /* Set the cost and width fields */
2517 4774 : childrel->reltarget->cost.startup = parentrel->reltarget->cost.startup;
2518 4774 : childrel->reltarget->cost.per_tuple = parentrel->reltarget->cost.per_tuple;
2519 4774 : childrel->reltarget->width = parentrel->reltarget->width;
2520 4774 : }
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