Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * relnode.c
4 : : * Relation-node lookup/construction routines
5 : : *
6 : : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
7 : : * Portions Copyright (c) 1994, Regents of the University of California
8 : : *
9 : : *
10 : : * IDENTIFICATION
11 : : * src/backend/optimizer/util/relnode.c
12 : : *
13 : : *-------------------------------------------------------------------------
14 : : */
15 : : #include "postgres.h"
16 : :
17 : : #include <limits.h>
18 : :
19 : : #include "access/nbtree.h"
20 : : #include "catalog/pg_constraint.h"
21 : : #include "miscadmin.h"
22 : : #include "nodes/nodeFuncs.h"
23 : : #include "optimizer/appendinfo.h"
24 : : #include "optimizer/clauses.h"
25 : : #include "optimizer/cost.h"
26 : : #include "optimizer/inherit.h"
27 : : #include "optimizer/optimizer.h"
28 : : #include "optimizer/pathnode.h"
29 : : #include "optimizer/paths.h"
30 : : #include "optimizer/placeholder.h"
31 : : #include "optimizer/plancat.h"
32 : : #include "optimizer/planner.h"
33 : : #include "optimizer/restrictinfo.h"
34 : : #include "optimizer/tlist.h"
35 : : #include "parser/parse_oper.h"
36 : : #include "parser/parse_relation.h"
37 : : #include "rewrite/rewriteManip.h"
38 : : #include "utils/hsearch.h"
39 : : #include "utils/lsyscache.h"
40 : : #include "utils/selfuncs.h"
41 : : #include "utils/typcache.h"
42 : :
43 : :
44 : : typedef struct JoinHashEntry
45 : : {
46 : : Relids join_relids; /* hash key --- MUST BE FIRST */
47 : : RelOptInfo *join_rel;
48 : : } JoinHashEntry;
49 : :
50 : : /* Hook for plugins to get control in build_simple_rel() */
51 : : build_simple_rel_hook_type build_simple_rel_hook = NULL;
52 : :
53 : : /* Hook for plugins to get control during joinrel setup */
54 : : joinrel_setup_hook_type joinrel_setup_hook = NULL;
55 : :
56 : : static void build_joinrel_tlist(PlannerInfo *root, RelOptInfo *joinrel,
57 : : RelOptInfo *input_rel,
58 : : SpecialJoinInfo *sjinfo,
59 : : List *pushed_down_joins,
60 : : bool can_null);
61 : : static List *build_joinrel_restrictlist(PlannerInfo *root,
62 : : RelOptInfo *joinrel,
63 : : RelOptInfo *outer_rel,
64 : : RelOptInfo *inner_rel,
65 : : SpecialJoinInfo *sjinfo);
66 : : static void build_joinrel_joinlist(RelOptInfo *joinrel,
67 : : RelOptInfo *outer_rel,
68 : : RelOptInfo *inner_rel);
69 : : static List *subbuild_joinrel_restrictlist(PlannerInfo *root,
70 : : RelOptInfo *joinrel,
71 : : RelOptInfo *input_rel,
72 : : Relids both_input_relids,
73 : : List *new_restrictlist);
74 : : static List *subbuild_joinrel_joinlist(RelOptInfo *joinrel,
75 : : List *joininfo_list,
76 : : List *new_joininfo);
77 : : static void set_foreign_rel_properties(RelOptInfo *joinrel,
78 : : RelOptInfo *outer_rel, RelOptInfo *inner_rel);
79 : : static void add_join_rel(PlannerInfo *root, RelOptInfo *joinrel);
80 : : static void build_joinrel_partition_info(PlannerInfo *root,
81 : : RelOptInfo *joinrel,
82 : : RelOptInfo *outer_rel, RelOptInfo *inner_rel,
83 : : SpecialJoinInfo *sjinfo,
84 : : List *restrictlist);
85 : : static bool have_partkey_equi_join(PlannerInfo *root, RelOptInfo *joinrel,
86 : : RelOptInfo *rel1, RelOptInfo *rel2,
87 : : JoinType jointype, List *restrictlist);
88 : : static int match_expr_to_partition_keys(Expr *expr, RelOptInfo *rel,
89 : : bool strict_op);
90 : : static void set_joinrel_partition_key_exprs(RelOptInfo *joinrel,
91 : : RelOptInfo *outer_rel, RelOptInfo *inner_rel,
92 : : JoinType jointype);
93 : : static void build_child_join_reltarget(PlannerInfo *root,
94 : : RelOptInfo *parentrel,
95 : : RelOptInfo *childrel,
96 : : int nappinfos,
97 : : AppendRelInfo **appinfos);
98 : : static bool eager_aggregation_possible_for_relation(PlannerInfo *root,
99 : : RelOptInfo *rel);
100 : : static bool init_grouping_targets(PlannerInfo *root, RelOptInfo *rel,
101 : : PathTarget *target, PathTarget *agg_input,
102 : : List **group_clauses, List **group_exprs);
103 : : static bool is_var_in_aggref_only(PlannerInfo *root, Var *var);
104 : : static bool is_var_needed_by_join(PlannerInfo *root, Var *var, RelOptInfo *rel);
105 : : static Index get_expression_sortgroupref(PlannerInfo *root, Expr *expr);
106 : :
107 : :
108 : : /*
109 : : * setup_simple_rel_arrays
110 : : * Prepare the arrays we use for quickly accessing base relations
111 : : * and AppendRelInfos.
112 : : */
113 : : void
5307 tgl@sss.pgh.pa.us 114 :CBC 304390 : setup_simple_rel_arrays(PlannerInfo *root)
115 : : {
116 : : int size;
117 : : Index rti;
118 : : ListCell *lc;
119 : :
120 : : /* Arrays are accessed using RT indexes (1..N) */
2410 121 : 304390 : size = list_length(root->parse->rtable) + 1;
122 : 304390 : root->simple_rel_array_size = size;
123 : :
124 : : /*
125 : : * simple_rel_array is initialized to all NULLs, since no RelOptInfos
126 : : * exist yet. It'll be filled by later calls to build_simple_rel().
127 : : */
5307 128 : 304390 : root->simple_rel_array = (RelOptInfo **)
95 michael@paquier.xyz 129 :GNC 304390 : palloc0_array(RelOptInfo *, size);
130 : :
131 : : /* simple_rte_array is an array equivalent of the rtable list */
5307 tgl@sss.pgh.pa.us 132 :CBC 304390 : root->simple_rte_array = (RangeTblEntry **)
95 michael@paquier.xyz 133 :GNC 304390 : palloc0_array(RangeTblEntry *, size);
5307 tgl@sss.pgh.pa.us 134 :CBC 304390 : rti = 1;
135 [ + - + + : 825416 : foreach(lc, root->parse->rtable)
+ + ]
136 : : {
137 : 521026 : RangeTblEntry *rte = (RangeTblEntry *) lfirst(lc);
138 : :
139 : 521026 : root->simple_rte_array[rti++] = rte;
140 : : }
141 : :
142 : : /* append_rel_array is not needed if there are no AppendRelInfos */
2819 alvherre@alvh.no-ip. 143 [ + + ]: 304390 : if (root->append_rel_list == NIL)
144 : : {
145 : 301562 : root->append_rel_array = NULL;
146 : 301562 : return;
147 : : }
148 : :
149 : 2828 : root->append_rel_array = (AppendRelInfo **)
95 michael@paquier.xyz 150 :GNC 2828 : palloc0_array(AppendRelInfo *, size);
151 : :
152 : : /*
153 : : * append_rel_array is filled with any already-existing AppendRelInfos,
154 : : * which currently could only come from UNION ALL flattening. We might
155 : : * add more later during inheritance expansion, but it's the
156 : : * responsibility of the expansion code to update the array properly.
157 : : */
2819 alvherre@alvh.no-ip. 158 [ + - + + :CBC 11891 : foreach(lc, root->append_rel_list)
+ + ]
159 : : {
160 : 9063 : AppendRelInfo *appinfo = lfirst_node(AppendRelInfo, lc);
161 : 9063 : int child_relid = appinfo->child_relid;
162 : :
163 : : /* Sanity check */
164 [ - + ]: 9063 : Assert(child_relid < size);
165 : :
166 [ - + ]: 9063 : if (root->append_rel_array[child_relid])
2819 alvherre@alvh.no-ip. 167 [ # # ]:UBC 0 : elog(ERROR, "child relation already exists");
168 : :
2819 alvherre@alvh.no-ip. 169 :CBC 9063 : root->append_rel_array[child_relid] = appinfo;
170 : : }
171 : : }
172 : :
173 : : /*
174 : : * expand_planner_arrays
175 : : * Expand the PlannerInfo's per-RTE arrays by add_size members
176 : : * and initialize the newly added entries to NULLs
177 : : *
178 : : * Note: this causes the append_rel_array to become allocated even if
179 : : * it was not before. This is okay for current uses, because we only call
180 : : * this when adding child relations, which always have AppendRelInfos.
181 : : */
182 : : void
2542 tgl@sss.pgh.pa.us 183 : 10321 : expand_planner_arrays(PlannerInfo *root, int add_size)
184 : : {
185 : : int new_size;
186 : :
187 [ - + ]: 10321 : Assert(add_size > 0);
188 : :
189 : 10321 : new_size = root->simple_rel_array_size + add_size;
190 : :
1219 peter@eisentraut.org 191 : 10321 : root->simple_rel_array =
192 : 10321 : repalloc0_array(root->simple_rel_array, RelOptInfo *, root->simple_rel_array_size, new_size);
193 : :
194 : 10321 : root->simple_rte_array =
195 : 10321 : repalloc0_array(root->simple_rte_array, RangeTblEntry *, root->simple_rel_array_size, new_size);
196 : :
2542 tgl@sss.pgh.pa.us 197 [ + + ]: 10321 : if (root->append_rel_array)
1219 peter@eisentraut.org 198 : 3019 : root->append_rel_array =
199 : 3019 : repalloc0_array(root->append_rel_array, AppendRelInfo *, root->simple_rel_array_size, new_size);
200 : : else
201 : 7302 : root->append_rel_array =
202 : 7302 : palloc0_array(AppendRelInfo *, new_size);
203 : :
2542 tgl@sss.pgh.pa.us 204 : 10321 : root->simple_rel_array_size = new_size;
205 : 10321 : }
206 : :
207 : : /*
208 : : * build_simple_rel
209 : : * Construct a new RelOptInfo for a base relation or 'other' relation.
210 : : */
211 : : RelOptInfo *
3268 rhaas@postgresql.org 212 : 427371 : build_simple_rel(PlannerInfo *root, int relid, RelOptInfo *parent)
213 : : {
214 : : RelOptInfo *rel;
215 : : RangeTblEntry *rte;
216 : :
217 : : /* Rel should not exist already */
6903 tgl@sss.pgh.pa.us 218 [ + - - + ]: 427371 : Assert(relid > 0 && relid < root->simple_rel_array_size);
7348 219 [ - + ]: 427371 : if (root->simple_rel_array[relid] != NULL)
7348 tgl@sss.pgh.pa.us 220 [ # # ]:UBC 0 : elog(ERROR, "rel %d already exists", relid);
221 : :
222 : : /* Fetch RTE for relation */
6903 tgl@sss.pgh.pa.us 223 :CBC 427371 : rte = root->simple_rte_array[relid];
224 [ - + ]: 427371 : Assert(rte != NULL);
225 : :
7348 226 : 427371 : rel = makeNode(RelOptInfo);
3268 rhaas@postgresql.org 227 [ + + ]: 427371 : rel->reloptkind = parent ? RELOPT_OTHER_MEMBER_REL : RELOPT_BASEREL;
8436 tgl@sss.pgh.pa.us 228 : 427371 : rel->relids = bms_make_singleton(relid);
9533 229 : 427371 : rel->rows = 0;
230 : : /* cheap startup cost is interesting iff not all tuples to be retrieved */
4943 231 : 427371 : rel->consider_startup = (root->tuple_fraction > 0);
3189 232 : 427371 : rel->consider_param_startup = false; /* might get changed later */
233 : 427371 : rel->consider_parallel = false; /* might get changed later */
46 rhaas@postgresql.org 234 :GNC 427371 : rel->pgs_mask = root->glob->default_pgs_mask;
3653 tgl@sss.pgh.pa.us 235 :CBC 427371 : rel->reltarget = create_empty_pathtarget();
9533 236 : 427371 : rel->pathlist = NIL;
5078 237 : 427371 : rel->ppilist = NIL;
3707 rhaas@postgresql.org 238 : 427371 : rel->partial_pathlist = NIL;
9525 tgl@sss.pgh.pa.us 239 : 427371 : rel->cheapest_startup_path = NULL;
240 : 427371 : rel->cheapest_total_path = NULL;
5161 241 : 427371 : rel->cheapest_parameterized_paths = NIL;
8436 242 : 427371 : rel->relid = relid;
8708 243 : 427371 : rel->rtekind = rte->rtekind;
244 : : /* min_attr, max_attr, attr_needed, attr_widths are set below */
782 drowley@postgresql.o 245 : 427371 : rel->notnullattnums = NULL;
4949 tgl@sss.pgh.pa.us 246 : 427371 : rel->lateral_vars = NIL;
9065 247 : 427371 : rel->indexlist = NIL;
3264 248 : 427371 : rel->statlist = NIL;
9533 249 : 427371 : rel->pages = 0;
250 : 427371 : rel->tuples = 0;
5266 251 : 427371 : rel->allvisfrac = 0;
2429 drowley@postgresql.o 252 : 427371 : rel->eclass_indexes = NULL;
5307 tgl@sss.pgh.pa.us 253 : 427371 : rel->subroot = NULL;
4939 254 : 427371 : rel->subplan_params = NIL;
3189 255 : 427371 : rel->rel_parallel_workers = -1; /* set up in get_relation_info */
1842 drowley@postgresql.o 256 : 427371 : rel->amflags = 0;
3962 tgl@sss.pgh.pa.us 257 : 427371 : rel->serverid = InvalidOid;
1195 alvherre@alvh.no-ip. 258 [ + + ]: 427371 : if (rte->rtekind == RTE_RELATION)
259 : : {
1119 260 [ + + + + : 266227 : Assert(parent == NULL ||
- + ]
261 : : parent->rtekind == RTE_RELATION ||
262 : : parent->rtekind == RTE_SUBQUERY);
263 : :
264 : : /*
265 : : * For any RELATION rte, we need a userid with which to check
266 : : * permission access. Baserels simply use their own
267 : : * RTEPermissionInfo's checkAsUser.
268 : : *
269 : : * For otherrels normally there's no RTEPermissionInfo, so we use the
270 : : * parent's, which normally has one. The exceptional case is that the
271 : : * parent is a subquery, in which case the otherrel will have its own.
272 : : */
273 [ + + ]: 266227 : if (rel->reloptkind == RELOPT_BASEREL ||
274 [ + - ]: 22376 : (rel->reloptkind == RELOPT_OTHER_MEMBER_REL &&
275 [ + + ]: 22376 : parent->rtekind == RTE_SUBQUERY))
1195 276 : 244406 : {
277 : : RTEPermissionInfo *perminfo;
278 : :
279 : 244406 : perminfo = getRTEPermissionInfo(root->parse->rteperminfos, rte);
280 : 244406 : rel->userid = perminfo->checkAsUser;
281 : : }
282 : : else
283 : 21821 : rel->userid = parent->userid;
284 : : }
285 : : else
286 : 161144 : rel->userid = InvalidOid;
3530 tgl@sss.pgh.pa.us 287 : 427371 : rel->useridiscurrent = false;
5119 288 : 427371 : rel->fdwroutine = NULL;
289 : 427371 : rel->fdw_private = NULL;
3264 290 : 427371 : rel->unique_for_rels = NIL;
291 : 427371 : rel->non_unique_for_rels = NIL;
208 rguo@postgresql.org 292 :GNC 427371 : rel->unique_rel = NULL;
293 : 427371 : rel->unique_pathkeys = NIL;
294 : 427371 : rel->unique_groupclause = NIL;
9533 tgl@sss.pgh.pa.us 295 :CBC 427371 : rel->baserestrictinfo = NIL;
8463 296 : 427371 : rel->baserestrictcost.startup = 0;
297 : 427371 : rel->baserestrictcost.per_tuple = 0;
3343 298 : 427371 : rel->baserestrict_min_security = UINT_MAX;
9533 299 : 427371 : rel->joininfo = NIL;
6994 300 : 427371 : rel->has_eclass_joins = false;
2603 301 : 427371 : rel->consider_partitionwise_join = false; /* might get changed later */
158 rguo@postgresql.org 302 :GNC 427371 : rel->agg_info = NULL;
303 : 427371 : rel->grouped_rel = NULL;
3098 rhaas@postgresql.org 304 :CBC 427371 : rel->part_scheme = NULL;
2167 efujita@postgresql.o 305 : 427371 : rel->nparts = -1;
3098 rhaas@postgresql.org 306 : 427371 : rel->boundinfo = NULL;
2167 efujita@postgresql.o 307 : 427371 : rel->partbounds_merged = false;
2900 alvherre@alvh.no-ip. 308 : 427371 : rel->partition_qual = NIL;
3098 rhaas@postgresql.org 309 : 427371 : rel->part_rels = NULL;
1685 drowley@postgresql.o 310 : 427371 : rel->live_parts = NULL;
2167 efujita@postgresql.o 311 : 427371 : rel->all_partrels = NULL;
3098 rhaas@postgresql.org 312 : 427371 : rel->partexprs = NULL;
3082 313 : 427371 : rel->nullable_partexprs = NULL;
314 : :
315 : : /*
316 : : * Pass assorted information down the inheritance hierarchy.
317 : : */
3268 318 [ + + ]: 427371 : if (parent)
319 : : {
320 : : /* We keep back-links to immediate parent and topmost parent. */
1305 tgl@sss.pgh.pa.us 321 : 30884 : rel->parent = parent;
322 [ + + ]: 30884 : rel->top_parent = parent->top_parent ? parent->top_parent : parent;
323 : 30884 : rel->top_parent_relids = rel->top_parent->relids;
324 : :
325 : : /*
326 : : * A child rel is below the same outer joins as its parent. (We
327 : : * presume this info was already calculated for the parent.)
328 : : */
1140 329 : 30884 : rel->nulling_relids = parent->nulling_relids;
330 : :
331 : : /*
332 : : * Also propagate lateral-reference information from appendrel parent
333 : : * rels to their child rels. We intentionally give each child rel the
334 : : * same minimum parameterization, even though it's quite possible that
335 : : * some don't reference all the lateral rels. This is because any
336 : : * append path for the parent will have to have the same
337 : : * parameterization for every child anyway, and there's no value in
338 : : * forcing extra reparameterize_path() calls. Similarly, a lateral
339 : : * reference to the parent prevents use of otherwise-movable join rels
340 : : * for each child.
341 : : *
342 : : * It's possible for child rels to have their own children, in which
343 : : * case the topmost parent's lateral info propagates all the way down.
344 : : */
2546 345 : 30884 : rel->direct_lateral_relids = parent->direct_lateral_relids;
346 : 30884 : rel->lateral_relids = parent->lateral_relids;
347 : 30884 : rel->lateral_referencers = parent->lateral_referencers;
348 : : }
349 : : else
350 : : {
1305 351 : 396487 : rel->parent = NULL;
352 : 396487 : rel->top_parent = NULL;
3268 rhaas@postgresql.org 353 : 396487 : rel->top_parent_relids = NULL;
1140 tgl@sss.pgh.pa.us 354 : 396487 : rel->nulling_relids = NULL;
2546 355 : 396487 : rel->direct_lateral_relids = NULL;
356 : 396487 : rel->lateral_relids = NULL;
357 : 396487 : rel->lateral_referencers = NULL;
358 : : }
359 : :
360 : : /* Check type of rtable entry */
8769 361 [ + + + - ]: 427371 : switch (rte->rtekind)
362 : : {
363 : 266227 : case RTE_RELATION:
364 : : /* Table --- retrieve statistics from the system catalogs */
7117 365 : 266227 : get_relation_info(root, rte->relid, rte->inh, rel);
8441 366 : 266218 : break;
8769 367 : 60844 : case RTE_SUBQUERY:
368 : : case RTE_FUNCTION:
369 : : case RTE_TABLEFUNC:
370 : : case RTE_VALUES:
371 : : case RTE_CTE:
372 : : case RTE_NAMEDTUPLESTORE:
373 : :
374 : : /*
375 : : * Subquery, function, tablefunc, values list, CTE, or ENR --- set
376 : : * up attr range and arrays
377 : : *
378 : : * Note: 0 is included in range to support whole-row Vars
379 : : */
8133 380 : 60844 : rel->min_attr = 0;
7959 neilc@samurai.com 381 : 60844 : rel->max_attr = list_length(rte->eref->colnames);
7774 tgl@sss.pgh.pa.us 382 : 60844 : rel->attr_needed = (Relids *)
95 michael@paquier.xyz 383 :GNC 60844 : palloc0_array(Relids, rel->max_attr - rel->min_attr + 1);
7774 tgl@sss.pgh.pa.us 384 :CBC 60844 : rel->attr_widths = (int32 *)
95 michael@paquier.xyz 385 :GNC 60844 : palloc0_array(int32, rel->max_attr - rel->min_attr + 1);
8769 tgl@sss.pgh.pa.us 386 :CBC 60844 : break;
2603 387 : 100300 : case RTE_RESULT:
388 : : /* RTE_RESULT has no columns, nor could it have whole-row Var */
389 : 100300 : rel->min_attr = 0;
390 : 100300 : rel->max_attr = -1;
391 : 100300 : rel->attr_needed = NULL;
392 : 100300 : rel->attr_widths = NULL;
393 : 100300 : break;
8769 tgl@sss.pgh.pa.us 394 :UBC 0 : default:
8269 395 [ # # ]: 0 : elog(ERROR, "unrecognized RTE kind: %d",
396 : : (int) rte->rtekind);
397 : : break;
398 : : }
399 : :
400 : : /*
401 : : * Allow a plugin to editorialize on the new RelOptInfo. This could
402 : : * involve editorializing on the information which get_relation_info
403 : : * obtained from the catalogs, such as altering the assumed relation size,
404 : : * removing an index, or adding a hypothetical index to the indexlist.
405 : : *
406 : : * An extension can also modify rel->pgs_mask here to control path
407 : : * generation.
408 : : */
6 rhaas@postgresql.org 409 [ + + ]:GNC 427362 : if (build_simple_rel_hook)
410 : 382 : (*build_simple_rel_hook) (root, rel, rte);
411 : :
412 : : /*
413 : : * Apply the parent's quals to the child, with appropriate substitution of
414 : : * variables. If any resulting clause is reduced to constant FALSE or
415 : : * NULL, apply_child_basequals returns false to indicate that scanning
416 : : * this relation won't yield any rows. In this case, we mark the child as
417 : : * dummy right away. (We must do this immediately so that pruning works
418 : : * correctly when recursing in expand_partitioned_rtentry.)
419 : : */
2542 tgl@sss.pgh.pa.us 420 [ + + ]:CBC 427362 : if (parent)
421 : : {
422 : 30884 : AppendRelInfo *appinfo = root->append_rel_array[relid];
423 : :
424 [ - + ]: 30884 : Assert(appinfo != NULL);
425 [ + + ]: 30884 : if (!apply_child_basequals(root, parent, rel, rte, appinfo))
426 : : {
427 : : /*
428 : : * A restriction clause reduced to constant FALSE or NULL after
429 : : * substitution. Mark the child as dummy so that it need not be
430 : : * scanned.
431 : : */
432 : 48 : mark_dummy_rel(rel);
433 : : }
434 : : }
435 : :
436 : : /* Save the finished struct in the query's simple_rel_array */
11 rguo@postgresql.org 437 :GNC 427362 : root->simple_rel_array[relid] = rel;
438 : :
2542 tgl@sss.pgh.pa.us 439 :CBC 427362 : return rel;
440 : : }
441 : :
442 : : /*
443 : : * build_simple_grouped_rel
444 : : * Construct a new RelOptInfo representing a grouped version of the input
445 : : * simple relation.
446 : : */
447 : : RelOptInfo *
158 rguo@postgresql.org 448 :GNC 1534 : build_simple_grouped_rel(PlannerInfo *root, RelOptInfo *rel)
449 : : {
450 : : RelOptInfo *grouped_rel;
451 : : RelAggInfo *agg_info;
452 : :
453 : : /*
454 : : * We should have available aggregate expressions and grouping
455 : : * expressions, otherwise we cannot reach here.
456 : : */
457 [ - + ]: 1534 : Assert(root->agg_clause_list != NIL);
458 [ - + ]: 1534 : Assert(root->group_expr_list != NIL);
459 : :
460 : : /* nothing to do for dummy rel */
461 [ - + ]: 1534 : if (IS_DUMMY_REL(rel))
158 rguo@postgresql.org 462 :UNC 0 : return NULL;
463 : :
464 : : /*
465 : : * Prepare the information needed to create grouped paths for this simple
466 : : * relation.
467 : : */
158 rguo@postgresql.org 468 :GNC 1534 : agg_info = create_rel_agg_info(root, rel, true);
469 [ + + ]: 1534 : if (agg_info == NULL)
470 : 1110 : return NULL;
471 : :
472 : : /*
473 : : * If grouped paths for the given simple relation are not considered
474 : : * useful, skip building the grouped relation.
475 : : */
476 [ + + ]: 424 : if (!agg_info->agg_useful)
477 : 131 : return NULL;
478 : :
479 : : /* Track the set of relids at which partial aggregation is applied */
152 480 : 293 : agg_info->apply_agg_at = bms_copy(rel->relids);
481 : :
482 : : /* build the grouped relation */
158 483 : 293 : grouped_rel = build_grouped_rel(root, rel);
484 : 293 : grouped_rel->reltarget = agg_info->target;
485 : 293 : grouped_rel->rows = agg_info->grouped_rows;
486 : 293 : grouped_rel->agg_info = agg_info;
487 : :
488 : 293 : rel->grouped_rel = grouped_rel;
489 : :
490 : 293 : return grouped_rel;
491 : : }
492 : :
493 : : /*
494 : : * build_grouped_rel
495 : : * Build a grouped relation by flat copying the input relation and resetting
496 : : * the necessary fields.
497 : : */
498 : : RelOptInfo *
499 : 8728 : build_grouped_rel(PlannerInfo *root, RelOptInfo *rel)
500 : : {
501 : : RelOptInfo *grouped_rel;
502 : :
503 : 8728 : grouped_rel = makeNode(RelOptInfo);
504 : 8728 : memcpy(grouped_rel, rel, sizeof(RelOptInfo));
505 : :
506 : : /*
507 : : * clear path info
508 : : */
509 : 8728 : grouped_rel->pathlist = NIL;
510 : 8728 : grouped_rel->ppilist = NIL;
511 : 8728 : grouped_rel->partial_pathlist = NIL;
512 : 8728 : grouped_rel->cheapest_startup_path = NULL;
513 : 8728 : grouped_rel->cheapest_total_path = NULL;
514 : 8728 : grouped_rel->cheapest_parameterized_paths = NIL;
515 : :
516 : : /*
517 : : * clear partition info
518 : : */
519 : 8728 : grouped_rel->part_scheme = NULL;
520 : 8728 : grouped_rel->nparts = -1;
521 : 8728 : grouped_rel->boundinfo = NULL;
522 : 8728 : grouped_rel->partbounds_merged = false;
523 : 8728 : grouped_rel->partition_qual = NIL;
524 : 8728 : grouped_rel->part_rels = NULL;
525 : 8728 : grouped_rel->live_parts = NULL;
526 : 8728 : grouped_rel->all_partrels = NULL;
527 : 8728 : grouped_rel->partexprs = NULL;
528 : 8728 : grouped_rel->nullable_partexprs = NULL;
529 : 8728 : grouped_rel->consider_partitionwise_join = false;
530 : :
531 : : /*
532 : : * clear size estimates
533 : : */
534 : 8728 : grouped_rel->rows = 0;
535 : :
536 : 8728 : return grouped_rel;
537 : : }
538 : :
539 : : /*
540 : : * find_base_rel
541 : : * Find a base or otherrel relation entry, which must already exist.
542 : : */
543 : : RelOptInfo *
7588 tgl@sss.pgh.pa.us 544 :CBC 4219305 : find_base_rel(PlannerInfo *root, int relid)
545 : : {
546 : : RelOptInfo *rel;
547 : :
548 : : /* use an unsigned comparison to prevent negative array element access */
898 drowley@postgresql.o 549 [ + - ]: 4219305 : if ((uint32) relid < (uint32) root->simple_rel_array_size)
550 : : {
7348 tgl@sss.pgh.pa.us 551 : 4219305 : rel = root->simple_rel_array[relid];
7587 552 [ + - ]: 4219305 : if (rel)
9065 553 : 4219305 : return rel;
554 : : }
555 : :
8269 tgl@sss.pgh.pa.us 556 [ # # ]:UBC 0 : elog(ERROR, "no relation entry for relid %d", relid);
557 : :
558 : : return NULL; /* keep compiler quiet */
559 : : }
560 : :
561 : : /*
562 : : * find_base_rel_noerr
563 : : * Find a base or otherrel relation entry, returning NULL if there's none
564 : : */
565 : : RelOptInfo *
797 tgl@sss.pgh.pa.us 566 :CBC 935751 : find_base_rel_noerr(PlannerInfo *root, int relid)
567 : : {
568 : : /* use an unsigned comparison to prevent negative array element access */
569 [ + - ]: 935751 : if ((uint32) relid < (uint32) root->simple_rel_array_size)
570 : 935751 : return root->simple_rel_array[relid];
797 tgl@sss.pgh.pa.us 571 :UBC 0 : return NULL;
572 : : }
573 : :
574 : : /*
575 : : * find_base_rel_ignore_join
576 : : * Find a base or otherrel relation entry, which must already exist.
577 : : *
578 : : * Unlike find_base_rel, if relid references an outer join then this
579 : : * will return NULL rather than raising an error. This is convenient
580 : : * for callers that must deal with relid sets including both base and
581 : : * outer joins.
582 : : */
583 : : RelOptInfo *
1140 tgl@sss.pgh.pa.us 584 :CBC 113675 : find_base_rel_ignore_join(PlannerInfo *root, int relid)
585 : : {
586 : : /* use an unsigned comparison to prevent negative array element access */
898 drowley@postgresql.o 587 [ + - ]: 113675 : if ((uint32) relid < (uint32) root->simple_rel_array_size)
588 : : {
589 : : RelOptInfo *rel;
590 : : RangeTblEntry *rte;
591 : :
1140 tgl@sss.pgh.pa.us 592 : 113675 : rel = root->simple_rel_array[relid];
593 [ + + ]: 113675 : if (rel)
594 : 106367 : return rel;
595 : :
596 : : /*
597 : : * We could just return NULL here, but for debugging purposes it seems
598 : : * best to actually verify that the relid is an outer join and not
599 : : * something weird.
600 : : */
601 : 7308 : rte = root->simple_rte_array[relid];
602 [ + - + - : 7308 : if (rte && rte->rtekind == RTE_JOIN && rte->jointype != JOIN_INNER)
+ - ]
603 : 7308 : return NULL;
604 : : }
605 : :
1140 tgl@sss.pgh.pa.us 606 [ # # ]:UBC 0 : elog(ERROR, "no relation entry for relid %d", relid);
607 : :
608 : : return NULL; /* keep compiler quiet */
609 : : }
610 : :
611 : : /*
612 : : * build_join_rel_hash
613 : : * Construct the auxiliary hash table for join relations.
614 : : */
615 : : static void
7585 tgl@sss.pgh.pa.us 616 :CBC 28 : build_join_rel_hash(PlannerInfo *root)
617 : : {
618 : : HTAB *hashtab;
619 : : HASHCTL hash_ctl;
620 : : ListCell *l;
621 : :
622 : : /* Create the hash table */
623 : 28 : hash_ctl.keysize = sizeof(Relids);
624 : 28 : hash_ctl.entrysize = sizeof(JoinHashEntry);
625 : 28 : hash_ctl.hash = bitmap_hash;
626 : 28 : hash_ctl.match = bitmap_match;
627 : 28 : hash_ctl.hcxt = CurrentMemoryContext;
628 : 28 : hashtab = hash_create("JoinRelHashTable",
629 : : 256L,
630 : : &hash_ctl,
631 : : HASH_ELEM | HASH_FUNCTION | HASH_COMPARE | HASH_CONTEXT);
632 : :
633 : : /* Insert all the already-existing joinrels */
634 [ + - + + : 952 : foreach(l, root->join_rel_list)
+ + ]
635 : : {
636 : 924 : RelOptInfo *rel = (RelOptInfo *) lfirst(l);
637 : : JoinHashEntry *hentry;
638 : : bool found;
639 : :
640 : 924 : hentry = (JoinHashEntry *) hash_search(hashtab,
641 : 924 : &(rel->relids),
642 : : HASH_ENTER,
643 : : &found);
644 [ - + ]: 924 : Assert(!found);
645 : 924 : hentry->join_rel = rel;
646 : : }
647 : :
648 : 28 : root->join_rel_hash = hashtab;
649 : 28 : }
650 : :
651 : : /*
652 : : * find_join_rel
653 : : * Returns relation entry corresponding to 'relids' (a set of RT indexes),
654 : : * or NULL if none exists. This is for join relations.
655 : : */
656 : : RelOptInfo *
7588 657 : 215917 : find_join_rel(PlannerInfo *root, Relids relids)
658 : : {
659 : : /*
660 : : * Switch to using hash lookup when list grows "too long". The threshold
661 : : * is arbitrary and is known only here.
662 : : */
7585 663 [ + + + + ]: 215917 : if (!root->join_rel_hash && list_length(root->join_rel_list) > 32)
664 : 28 : build_join_rel_hash(root);
665 : :
666 : : /*
667 : : * Use either hashtable lookup or linear search, as appropriate.
668 : : *
669 : : * Note: the seemingly redundant hashkey variable is used to avoid taking
670 : : * the address of relids; unless the compiler is exceedingly smart, doing
671 : : * so would force relids out of a register and thus probably slow down the
672 : : * list-search case.
673 : : */
674 [ + + ]: 215917 : if (root->join_rel_hash)
675 : : {
676 : 2352 : Relids hashkey = relids;
677 : : JoinHashEntry *hentry;
678 : :
679 : 2352 : hentry = (JoinHashEntry *) hash_search(root->join_rel_hash,
680 : : &hashkey,
681 : : HASH_FIND,
682 : : NULL);
683 [ + + ]: 2352 : if (hentry)
684 : 2079 : return hentry->join_rel;
685 : : }
686 : : else
687 : : {
688 : : ListCell *l;
689 : :
690 [ + + + + : 1401377 : foreach(l, root->join_rel_list)
+ + ]
691 : : {
692 : 1262008 : RelOptInfo *rel = (RelOptInfo *) lfirst(l);
693 : :
694 [ + + ]: 1262008 : if (bms_equal(rel->relids, relids))
695 : 74196 : return rel;
696 : : }
697 : : }
698 : :
9533 699 : 139642 : return NULL;
700 : : }
701 : :
702 : : /*
703 : : * set_foreign_rel_properties
704 : : * Set up foreign-join fields if outer and inner relation are foreign
705 : : * tables (or joins) belonging to the same server and assigned to the same
706 : : * user to check access permissions as.
707 : : *
708 : : * In addition to an exact match of userid, we allow the case where one side
709 : : * has zero userid (implying current user) and the other side has explicit
710 : : * userid that happens to equal the current user; but in that case, pushdown of
711 : : * the join is only valid for the current user. The useridiscurrent field
712 : : * records whether we had to make such an assumption for this join or any
713 : : * sub-join.
714 : : *
715 : : * Otherwise these fields are left invalid, so GetForeignJoinPaths will not be
716 : : * called for the join relation.
717 : : */
718 : : static void
3288 rhaas@postgresql.org 719 : 139163 : set_foreign_rel_properties(RelOptInfo *joinrel, RelOptInfo *outer_rel,
720 : : RelOptInfo *inner_rel)
721 : : {
722 [ + + ]: 139163 : if (OidIsValid(outer_rel->serverid) &&
723 [ + + ]: 449 : inner_rel->serverid == outer_rel->serverid)
724 : : {
725 [ + + ]: 403 : if (inner_rel->userid == outer_rel->userid)
726 : : {
727 : 397 : joinrel->serverid = outer_rel->serverid;
728 : 397 : joinrel->userid = outer_rel->userid;
729 [ + - - + ]: 397 : joinrel->useridiscurrent = outer_rel->useridiscurrent || inner_rel->useridiscurrent;
730 : 397 : joinrel->fdwroutine = outer_rel->fdwroutine;
731 : : }
732 [ + + + + ]: 10 : else if (!OidIsValid(inner_rel->userid) &&
733 : 4 : outer_rel->userid == GetUserId())
734 : : {
735 : 2 : joinrel->serverid = outer_rel->serverid;
736 : 2 : joinrel->userid = outer_rel->userid;
737 : 2 : joinrel->useridiscurrent = true;
738 : 2 : joinrel->fdwroutine = outer_rel->fdwroutine;
739 : : }
740 [ - + - - ]: 4 : else if (!OidIsValid(outer_rel->userid) &&
3288 rhaas@postgresql.org 741 :UBC 0 : inner_rel->userid == GetUserId())
742 : : {
743 : 0 : joinrel->serverid = outer_rel->serverid;
744 : 0 : joinrel->userid = inner_rel->userid;
745 : 0 : joinrel->useridiscurrent = true;
746 : 0 : joinrel->fdwroutine = outer_rel->fdwroutine;
747 : : }
748 : : }
3288 rhaas@postgresql.org 749 :CBC 139163 : }
750 : :
751 : : /*
752 : : * add_join_rel
753 : : * Add given join relation to the list of join relations in the given
754 : : * PlannerInfo. Also add it to the auxiliary hashtable if there is one.
755 : : */
756 : : static void
757 : 139163 : add_join_rel(PlannerInfo *root, RelOptInfo *joinrel)
758 : : {
759 : : /* GEQO requires us to append the new joinrel to the end of the list! */
760 : 139163 : root->join_rel_list = lappend(root->join_rel_list, joinrel);
761 : :
762 : : /* store it into the auxiliary hashtable if there is one. */
763 [ + + ]: 139163 : if (root->join_rel_hash)
764 : : {
765 : : JoinHashEntry *hentry;
766 : : bool found;
767 : :
768 : 273 : hentry = (JoinHashEntry *) hash_search(root->join_rel_hash,
769 : 273 : &(joinrel->relids),
770 : : HASH_ENTER,
771 : : &found);
772 [ - + ]: 273 : Assert(!found);
773 : 273 : hentry->join_rel = joinrel;
774 : : }
775 : 139163 : }
776 : :
777 : : /*
778 : : * build_join_rel
779 : : * Returns relation entry corresponding to the union of two given rels,
780 : : * creating a new relation entry if none already exists.
781 : : *
782 : : * 'joinrelids' is the Relids set that uniquely identifies the join
783 : : * 'outer_rel' and 'inner_rel' are relation nodes for the relations to be
784 : : * joined
785 : : * 'sjinfo': join context info
786 : : * 'pushed_down_joins': any pushed-down outer joins that are now completed
787 : : * 'restrictlist_ptr': result variable. If not NULL, *restrictlist_ptr
788 : : * receives the list of RestrictInfo nodes that apply to this
789 : : * particular pair of joinable relations.
790 : : *
791 : : * restrictlist_ptr makes the routine's API a little grotty, but it saves
792 : : * duplicated calculation of the restrictlist...
793 : : */
794 : : RelOptInfo *
7588 tgl@sss.pgh.pa.us 795 : 204638 : build_join_rel(PlannerInfo *root,
796 : : Relids joinrelids,
797 : : RelOptInfo *outer_rel,
798 : : RelOptInfo *inner_rel,
799 : : SpecialJoinInfo *sjinfo,
800 : : List *pushed_down_joins,
801 : : List **restrictlist_ptr)
802 : : {
803 : : RelOptInfo *joinrel;
804 : : List *restrictlist;
805 : :
806 : : /* This function should be used only for join between parents. */
3082 rhaas@postgresql.org 807 [ + - + - : 204638 : Assert(!IS_OTHER_REL(outer_rel) && !IS_OTHER_REL(inner_rel));
+ - + - +
- - + ]
808 : :
809 : : /*
810 : : * See if we already have a joinrel for this set of base rels.
811 : : */
9533 tgl@sss.pgh.pa.us 812 : 204638 : joinrel = find_join_rel(root, joinrelids);
813 : :
814 [ + + ]: 204638 : if (joinrel)
815 : : {
816 : : /*
817 : : * Yes, so we only need to figure the restrictlist for this particular
818 : : * pair of component relations.
819 : : */
820 [ + - ]: 74732 : if (restrictlist_ptr)
8914 821 : 74732 : *restrictlist_ptr = build_joinrel_restrictlist(root,
822 : : joinrel,
823 : : outer_rel,
824 : : inner_rel,
825 : : sjinfo);
9533 826 : 74732 : return joinrel;
827 : : }
828 : :
829 : : /*
830 : : * Nope, so make one.
831 : : */
832 : 129906 : joinrel = makeNode(RelOptInfo);
8769 833 : 129906 : joinrel->reloptkind = RELOPT_JOINREL;
8436 834 : 129906 : joinrel->relids = bms_copy(joinrelids);
9533 835 : 129906 : joinrel->rows = 0;
836 : : /* cheap startup cost is interesting iff not all tuples to be retrieved */
4943 837 : 129906 : joinrel->consider_startup = (root->tuple_fraction > 0);
3938 838 : 129906 : joinrel->consider_param_startup = false;
3777 rhaas@postgresql.org 839 : 129906 : joinrel->consider_parallel = false;
46 rhaas@postgresql.org 840 :GNC 129906 : joinrel->pgs_mask = root->glob->default_pgs_mask;
3653 tgl@sss.pgh.pa.us 841 :CBC 129906 : joinrel->reltarget = create_empty_pathtarget();
9533 842 : 129906 : joinrel->pathlist = NIL;
5078 843 : 129906 : joinrel->ppilist = NIL;
3707 rhaas@postgresql.org 844 : 129906 : joinrel->partial_pathlist = NIL;
9525 tgl@sss.pgh.pa.us 845 : 129906 : joinrel->cheapest_startup_path = NULL;
846 : 129906 : joinrel->cheapest_total_path = NULL;
5161 847 : 129906 : joinrel->cheapest_parameterized_paths = NIL;
848 : : /* init direct_lateral_relids from children; we'll finish it up below */
3747 849 : 129906 : joinrel->direct_lateral_relids =
850 : 129906 : bms_union(outer_rel->direct_lateral_relids,
851 : 129906 : inner_rel->direct_lateral_relids);
852 : 129906 : joinrel->lateral_relids = min_join_parameterization(root, joinrel->relids,
853 : : outer_rel, inner_rel);
8436 854 : 129906 : joinrel->relid = 0; /* indicates not a baserel */
8708 855 : 129906 : joinrel->rtekind = RTE_JOIN;
8295 856 : 129906 : joinrel->min_attr = 0;
857 : 129906 : joinrel->max_attr = 0;
858 : 129906 : joinrel->attr_needed = NULL;
859 : 129906 : joinrel->attr_widths = NULL;
782 drowley@postgresql.o 860 : 129906 : joinrel->notnullattnums = NULL;
1140 tgl@sss.pgh.pa.us 861 : 129906 : joinrel->nulling_relids = NULL;
4949 862 : 129906 : joinrel->lateral_vars = NIL;
4593 863 : 129906 : joinrel->lateral_referencers = NULL;
9065 864 : 129906 : joinrel->indexlist = NIL;
3264 865 : 129906 : joinrel->statlist = NIL;
9533 866 : 129906 : joinrel->pages = 0;
867 : 129906 : joinrel->tuples = 0;
5266 868 : 129906 : joinrel->allvisfrac = 0;
2429 drowley@postgresql.o 869 : 129906 : joinrel->eclass_indexes = NULL;
5307 tgl@sss.pgh.pa.us 870 : 129906 : joinrel->subroot = NULL;
4939 871 : 129906 : joinrel->subplan_params = NIL;
3530 872 : 129906 : joinrel->rel_parallel_workers = -1;
1842 drowley@postgresql.o 873 : 129906 : joinrel->amflags = 0;
3962 tgl@sss.pgh.pa.us 874 : 129906 : joinrel->serverid = InvalidOid;
3530 875 : 129906 : joinrel->userid = InvalidOid;
876 : 129906 : joinrel->useridiscurrent = false;
5119 877 : 129906 : joinrel->fdwroutine = NULL;
878 : 129906 : joinrel->fdw_private = NULL;
3264 879 : 129906 : joinrel->unique_for_rels = NIL;
880 : 129906 : joinrel->non_unique_for_rels = NIL;
208 rguo@postgresql.org 881 :GNC 129906 : joinrel->unique_rel = NULL;
882 : 129906 : joinrel->unique_pathkeys = NIL;
883 : 129906 : joinrel->unique_groupclause = NIL;
9533 tgl@sss.pgh.pa.us 884 :CBC 129906 : joinrel->baserestrictinfo = NIL;
8463 885 : 129906 : joinrel->baserestrictcost.startup = 0;
886 : 129906 : joinrel->baserestrictcost.per_tuple = 0;
3343 887 : 129906 : joinrel->baserestrict_min_security = UINT_MAX;
9533 888 : 129906 : joinrel->joininfo = NIL;
6994 889 : 129906 : joinrel->has_eclass_joins = false;
2603 890 : 129906 : joinrel->consider_partitionwise_join = false; /* might get changed later */
158 rguo@postgresql.org 891 :GNC 129906 : joinrel->agg_info = NULL;
892 : 129906 : joinrel->grouped_rel = NULL;
1305 tgl@sss.pgh.pa.us 893 :CBC 129906 : joinrel->parent = NULL;
894 : 129906 : joinrel->top_parent = NULL;
3268 rhaas@postgresql.org 895 : 129906 : joinrel->top_parent_relids = NULL;
3098 896 : 129906 : joinrel->part_scheme = NULL;
2167 efujita@postgresql.o 897 : 129906 : joinrel->nparts = -1;
3098 rhaas@postgresql.org 898 : 129906 : joinrel->boundinfo = NULL;
2167 efujita@postgresql.o 899 : 129906 : joinrel->partbounds_merged = false;
2900 alvherre@alvh.no-ip. 900 : 129906 : joinrel->partition_qual = NIL;
3098 rhaas@postgresql.org 901 : 129906 : joinrel->part_rels = NULL;
1685 drowley@postgresql.o 902 : 129906 : joinrel->live_parts = NULL;
2167 efujita@postgresql.o 903 : 129906 : joinrel->all_partrels = NULL;
3098 rhaas@postgresql.org 904 : 129906 : joinrel->partexprs = NULL;
3082 905 : 129906 : joinrel->nullable_partexprs = NULL;
906 : :
907 : : /* Compute information relevant to the foreign relations. */
3288 908 : 129906 : set_foreign_rel_properties(joinrel, outer_rel, inner_rel);
909 : :
910 : : /*
911 : : * Fill the joinrel's tlist with just the Vars and PHVs that need to be
912 : : * output from this join (ie, are needed for higher joinclauses or final
913 : : * output).
914 : : *
915 : : * NOTE: the tlist order for a join rel will depend on which pair of outer
916 : : * and inner rels we first try to build it from. But the contents should
917 : : * be the same regardless.
918 : : */
1033 tgl@sss.pgh.pa.us 919 : 129906 : build_joinrel_tlist(root, joinrel, outer_rel, sjinfo, pushed_down_joins,
1140 920 : 129906 : (sjinfo->jointype == JOIN_FULL));
1033 921 : 129906 : build_joinrel_tlist(root, joinrel, inner_rel, sjinfo, pushed_down_joins,
1140 922 : 129906 : (sjinfo->jointype != JOIN_INNER));
923 : 129906 : add_placeholders_to_joinrel(root, joinrel, outer_rel, inner_rel, sjinfo);
924 : :
925 : : /*
926 : : * add_placeholders_to_joinrel also took care of adding the ph_lateral
927 : : * sets of any PlaceHolderVars computed here to direct_lateral_relids, so
928 : : * now we can finish computing that. This is much like the computation of
929 : : * the transitively-closed lateral_relids in min_join_parameterization,
930 : : * except that here we *do* have to consider the added PHVs.
931 : : */
3747 932 : 129906 : joinrel->direct_lateral_relids =
933 : 129906 : bms_del_members(joinrel->direct_lateral_relids, joinrel->relids);
934 : :
935 : : /*
936 : : * Construct restrict and join clause lists for the new joinrel. (The
937 : : * caller might or might not need the restrictlist, but I need it anyway
938 : : * for set_joinrel_size_estimates().)
939 : : */
6994 940 : 129906 : restrictlist = build_joinrel_restrictlist(root, joinrel,
941 : : outer_rel, inner_rel,
942 : : sjinfo);
9533 943 [ + - ]: 129906 : if (restrictlist_ptr)
944 : 129906 : *restrictlist_ptr = restrictlist;
945 : 129906 : build_joinrel_joinlist(joinrel, outer_rel, inner_rel);
946 : :
947 : : /*
948 : : * This is also the right place to check whether the joinrel has any
949 : : * pending EquivalenceClass joins.
950 : : */
6994 951 : 129906 : joinrel->has_eclass_joins = has_relevant_eclass_joinclause(root, joinrel);
952 : :
953 : : /*
954 : : * Set estimates of the joinrel's size.
955 : : */
9533 956 : 129906 : set_joinrel_size_estimates(root, joinrel, outer_rel, inner_rel,
957 : : sjinfo, restrictlist);
958 : :
959 : : /*
960 : : * Set the consider_parallel flag if this joinrel could potentially be
961 : : * scanned within a parallel worker. If this flag is false for either
962 : : * inner_rel or outer_rel, then it must be false for the joinrel also.
963 : : * Even if both are true, there might be parallel-restricted expressions
964 : : * in the targetlist or quals.
965 : : *
966 : : * Note that if there are more than two rels in this relation, they could
967 : : * be divided between inner_rel and outer_rel in any arbitrary way. We
968 : : * assume this doesn't matter, because we should hit all the same baserels
969 : : * and joinclauses while building up to this joinrel no matter which we
970 : : * take; therefore, we should make the same decision here however we get
971 : : * here.
972 : : */
3777 rhaas@postgresql.org 973 [ + + + + : 239174 : if (inner_rel->consider_parallel && outer_rel->consider_parallel &&
+ + ]
3495 tgl@sss.pgh.pa.us 974 [ + + ]: 218152 : is_parallel_safe(root, (Node *) restrictlist) &&
975 : 108884 : is_parallel_safe(root, (Node *) joinrel->reltarget->exprs))
3777 rhaas@postgresql.org 976 : 108878 : joinrel->consider_parallel = true;
977 : :
978 : : /*
979 : : * Allow a plugin to editorialize on the new joinrel's properties. Actions
980 : : * might include altering the size estimate, clearing consider_parallel,
981 : : * or adjusting pgs_mask.
982 : : */
46 rhaas@postgresql.org 983 [ + + ]:GNC 129906 : if (joinrel_setup_hook)
984 : 134 : (*joinrel_setup_hook) (root, joinrel, outer_rel, inner_rel, sjinfo,
985 : : restrictlist);
986 : :
987 : : /* Store the partition information. */
988 : 129906 : build_joinrel_partition_info(root, joinrel, outer_rel, inner_rel, sjinfo,
989 : : restrictlist);
990 : :
991 : : /* Add the joinrel to the PlannerInfo. */
3288 rhaas@postgresql.org 992 :CBC 129906 : add_join_rel(root, joinrel);
993 : :
994 : : /*
995 : : * Also, if dynamic-programming join search is active, add the new joinrel
996 : : * to the appropriate sublist. Note: you might think the Assert on number
997 : : * of members should be for equality, but some of the level 1 rels might
998 : : * have been joinrels already, so we can only assert <=.
999 : : */
5951 tgl@sss.pgh.pa.us 1000 [ + + ]: 129906 : if (root->join_rel_level)
1001 : : {
1002 [ - + ]: 126540 : Assert(root->join_cur_level > 0);
1003 [ - + ]: 126540 : Assert(root->join_cur_level <= bms_num_members(joinrel->relids));
1004 : 126540 : root->join_rel_level[root->join_cur_level] =
1005 : 126540 : lappend(root->join_rel_level[root->join_cur_level], joinrel);
1006 : : }
1007 : :
9533 1008 : 129906 : return joinrel;
1009 : : }
1010 : :
1011 : : /*
1012 : : * build_child_join_rel
1013 : : * Builds RelOptInfo representing join between given two child relations.
1014 : : *
1015 : : * 'outer_rel' and 'inner_rel' are the RelOptInfos of child relations being
1016 : : * joined
1017 : : * 'parent_joinrel' is the RelOptInfo representing the join between parent
1018 : : * relations. Some of the members of new RelOptInfo are produced by
1019 : : * translating corresponding members of this RelOptInfo
1020 : : * 'restrictlist': list of RestrictInfo nodes that apply to this particular
1021 : : * pair of joinable relations
1022 : : * 'sjinfo': child join's join-type details
1023 : : * 'nappinfos' and 'appinfos': AppendRelInfo array for child relids
1024 : : */
1025 : : RelOptInfo *
3082 rhaas@postgresql.org 1026 : 9257 : build_child_join_rel(PlannerInfo *root, RelOptInfo *outer_rel,
1027 : : RelOptInfo *inner_rel, RelOptInfo *parent_joinrel,
1028 : : List *restrictlist, SpecialJoinInfo *sjinfo,
1029 : : int nappinfos, AppendRelInfo **appinfos)
1030 : : {
1031 : 9257 : RelOptInfo *joinrel = makeNode(RelOptInfo);
1032 : :
1033 : : /* Only joins between "other" relations land here. */
1034 [ + + - + : 9257 : Assert(IS_OTHER_REL(outer_rel) && IS_OTHER_REL(inner_rel));
- - + + -
+ - - ]
1035 : :
1036 : : /* The parent joinrel should have consider_partitionwise_join set. */
2753 efujita@postgresql.o 1037 [ - + ]: 9257 : Assert(parent_joinrel->consider_partitionwise_join);
1038 : :
3082 rhaas@postgresql.org 1039 : 9257 : joinrel->reloptkind = RELOPT_OTHER_JOINREL;
968 tgl@sss.pgh.pa.us 1040 : 9257 : joinrel->relids = adjust_child_relids(parent_joinrel->relids,
1041 : : nappinfos, appinfos);
3082 rhaas@postgresql.org 1042 : 9257 : joinrel->rows = 0;
1043 : : /* cheap startup cost is interesting iff not all tuples to be retrieved */
1044 : 9257 : joinrel->consider_startup = (root->tuple_fraction > 0);
1045 : 9257 : joinrel->consider_param_startup = false;
1046 : 9257 : joinrel->consider_parallel = false;
46 rhaas@postgresql.org 1047 :GNC 9257 : joinrel->pgs_mask = root->glob->default_pgs_mask;
3082 rhaas@postgresql.org 1048 :CBC 9257 : joinrel->reltarget = create_empty_pathtarget();
1049 : 9257 : joinrel->pathlist = NIL;
1050 : 9257 : joinrel->ppilist = NIL;
1051 : 9257 : joinrel->partial_pathlist = NIL;
1052 : 9257 : joinrel->cheapest_startup_path = NULL;
1053 : 9257 : joinrel->cheapest_total_path = NULL;
1054 : 9257 : joinrel->cheapest_parameterized_paths = NIL;
1055 : 9257 : joinrel->direct_lateral_relids = NULL;
1056 : 9257 : joinrel->lateral_relids = NULL;
1057 : 9257 : joinrel->relid = 0; /* indicates not a baserel */
1058 : 9257 : joinrel->rtekind = RTE_JOIN;
1059 : 9257 : joinrel->min_attr = 0;
1060 : 9257 : joinrel->max_attr = 0;
1061 : 9257 : joinrel->attr_needed = NULL;
1062 : 9257 : joinrel->attr_widths = NULL;
782 drowley@postgresql.o 1063 : 9257 : joinrel->notnullattnums = NULL;
1140 tgl@sss.pgh.pa.us 1064 : 9257 : joinrel->nulling_relids = NULL;
3082 rhaas@postgresql.org 1065 : 9257 : joinrel->lateral_vars = NIL;
1066 : 9257 : joinrel->lateral_referencers = NULL;
1067 : 9257 : joinrel->indexlist = NIL;
1068 : 9257 : joinrel->pages = 0;
1069 : 9257 : joinrel->tuples = 0;
1070 : 9257 : joinrel->allvisfrac = 0;
2429 drowley@postgresql.o 1071 : 9257 : joinrel->eclass_indexes = NULL;
3082 rhaas@postgresql.org 1072 : 9257 : joinrel->subroot = NULL;
1073 : 9257 : joinrel->subplan_params = NIL;
1842 drowley@postgresql.o 1074 : 9257 : joinrel->amflags = 0;
3082 rhaas@postgresql.org 1075 : 9257 : joinrel->serverid = InvalidOid;
1076 : 9257 : joinrel->userid = InvalidOid;
1077 : 9257 : joinrel->useridiscurrent = false;
1078 : 9257 : joinrel->fdwroutine = NULL;
1079 : 9257 : joinrel->fdw_private = NULL;
208 rguo@postgresql.org 1080 :GNC 9257 : joinrel->unique_rel = NULL;
1081 : 9257 : joinrel->unique_pathkeys = NIL;
1082 : 9257 : joinrel->unique_groupclause = NIL;
3082 rhaas@postgresql.org 1083 :CBC 9257 : joinrel->baserestrictinfo = NIL;
1084 : 9257 : joinrel->baserestrictcost.startup = 0;
1085 : 9257 : joinrel->baserestrictcost.per_tuple = 0;
1086 : 9257 : joinrel->joininfo = NIL;
1087 : 9257 : joinrel->has_eclass_joins = false;
2603 tgl@sss.pgh.pa.us 1088 : 9257 : joinrel->consider_partitionwise_join = false; /* might get changed later */
158 rguo@postgresql.org 1089 :GNC 9257 : joinrel->agg_info = NULL;
1090 : 9257 : joinrel->grouped_rel = NULL;
1305 tgl@sss.pgh.pa.us 1091 :CBC 9257 : joinrel->parent = parent_joinrel;
1092 [ + + ]: 9257 : joinrel->top_parent = parent_joinrel->top_parent ? parent_joinrel->top_parent : parent_joinrel;
1093 : 9257 : joinrel->top_parent_relids = joinrel->top_parent->relids;
3082 rhaas@postgresql.org 1094 : 9257 : joinrel->part_scheme = NULL;
2167 efujita@postgresql.o 1095 : 9257 : joinrel->nparts = -1;
2900 alvherre@alvh.no-ip. 1096 : 9257 : joinrel->boundinfo = NULL;
2167 efujita@postgresql.o 1097 : 9257 : joinrel->partbounds_merged = false;
2900 alvherre@alvh.no-ip. 1098 : 9257 : joinrel->partition_qual = NIL;
3082 rhaas@postgresql.org 1099 : 9257 : joinrel->part_rels = NULL;
1685 drowley@postgresql.o 1100 : 9257 : joinrel->live_parts = NULL;
2167 efujita@postgresql.o 1101 : 9257 : joinrel->all_partrels = NULL;
3082 rhaas@postgresql.org 1102 : 9257 : joinrel->partexprs = NULL;
1103 : 9257 : joinrel->nullable_partexprs = NULL;
1104 : :
1105 : : /* Compute information relevant to foreign relations. */
1106 : 9257 : set_foreign_rel_properties(joinrel, outer_rel, inner_rel);
1107 : :
1108 : : /* Set up reltarget struct */
2753 efujita@postgresql.o 1109 : 9257 : build_child_join_reltarget(root, parent_joinrel, joinrel,
1110 : : nappinfos, appinfos);
1111 : :
1112 : : /* Construct joininfo list. */
3082 rhaas@postgresql.org 1113 : 18514 : joinrel->joininfo = (List *) adjust_appendrel_attrs(root,
1114 : 9257 : (Node *) parent_joinrel->joininfo,
1115 : : nappinfos,
1116 : : appinfos);
1117 : :
1118 : : /*
1119 : : * Lateral relids referred in child join will be same as that referred in
1120 : : * the parent relation.
1121 : : */
1122 : 9257 : joinrel->direct_lateral_relids = (Relids) bms_copy(parent_joinrel->direct_lateral_relids);
1123 : 9257 : joinrel->lateral_relids = (Relids) bms_copy(parent_joinrel->lateral_relids);
1124 : :
1125 : : /*
1126 : : * If the parent joinrel has pending equivalence classes, so does the
1127 : : * child.
1128 : : */
1129 : 9257 : joinrel->has_eclass_joins = parent_joinrel->has_eclass_joins;
1130 : :
1131 : : /* Child joinrel is parallel safe if parent is parallel safe. */
1132 : 9257 : joinrel->consider_parallel = parent_joinrel->consider_parallel;
1133 : :
1134 : : /* Set estimates of the child-joinrel's size. */
1135 : 9257 : set_joinrel_size_estimates(root, joinrel, outer_rel, inner_rel,
1136 : : sjinfo, restrictlist);
1137 : :
1138 : : /*
1139 : : * Allow a plugin to editorialize on the new joinrel's properties. Actions
1140 : : * might include altering the size estimate, clearing consider_parallel,
1141 : : * or adjusting pgs_mask. (However, note that clearing consider_parallel
1142 : : * would be better done in the parent joinrel rather than here.)
1143 : : */
46 rhaas@postgresql.org 1144 [ + + ]:GNC 9257 : if (joinrel_setup_hook)
1145 : 72 : (*joinrel_setup_hook) (root, joinrel, outer_rel, inner_rel, sjinfo,
1146 : : restrictlist);
1147 : :
1148 : : /* Is the join between partitions itself partitioned? */
1149 : 9257 : build_joinrel_partition_info(root, joinrel, outer_rel, inner_rel, sjinfo,
1150 : : restrictlist);
1151 : :
1152 : : /* We build the join only once. */
3082 rhaas@postgresql.org 1153 [ - + ]:CBC 9257 : Assert(!find_join_rel(root, joinrel->relids));
1154 : :
1155 : : /* Add the relation to the PlannerInfo. */
1156 : 9257 : add_join_rel(root, joinrel);
1157 : :
1158 : : /*
1159 : : * We might need EquivalenceClass members corresponding to the child join,
1160 : : * so that we can represent sort pathkeys for it. As with children of
1161 : : * baserels, we shouldn't need this unless there are relevant eclass joins
1162 : : * (implying that a merge join might be possible) or pathkeys to sort by.
1163 : : */
2322 tgl@sss.pgh.pa.us 1164 [ + + + + ]: 9257 : if (joinrel->has_eclass_joins || has_useful_pathkeys(root, parent_joinrel))
1165 : 8963 : add_child_join_rel_equivalences(root,
1166 : : nappinfos, appinfos,
1167 : : parent_joinrel, joinrel);
1168 : :
3082 rhaas@postgresql.org 1169 : 9257 : return joinrel;
1170 : : }
1171 : :
1172 : : /*
1173 : : * min_join_parameterization
1174 : : *
1175 : : * Determine the minimum possible parameterization of a joinrel, that is, the
1176 : : * set of other rels it contains LATERAL references to. We save this value in
1177 : : * the join's RelOptInfo. This function is split out of build_join_rel()
1178 : : * because join_is_legal() needs the value to check a prospective join.
1179 : : */
1180 : : Relids
3747 tgl@sss.pgh.pa.us 1181 : 151636 : min_join_parameterization(PlannerInfo *root,
1182 : : Relids joinrelids,
1183 : : RelOptInfo *outer_rel,
1184 : : RelOptInfo *inner_rel)
1185 : : {
1186 : : Relids result;
1187 : :
1188 : : /*
1189 : : * Basically we just need the union of the inputs' lateral_relids, less
1190 : : * whatever is already in the join.
1191 : : *
1192 : : * It's not immediately obvious that this is a valid way to compute the
1193 : : * result, because it might seem that we're ignoring possible lateral refs
1194 : : * of PlaceHolderVars that are due to be computed at the join but not in
1195 : : * either input. However, because create_lateral_join_info() already
1196 : : * charged all such PHV refs to each member baserel of the join, they'll
1197 : : * be accounted for already in the inputs' lateral_relids. Likewise, we
1198 : : * do not need to worry about doing transitive closure here, because that
1199 : : * was already accounted for in the original baserel lateral_relids.
1200 : : */
1201 : 151636 : result = bms_union(outer_rel->lateral_relids, inner_rel->lateral_relids);
3751 1202 : 151636 : result = bms_del_members(result, joinrelids);
1203 : 151636 : return result;
1204 : : }
1205 : :
1206 : : /*
1207 : : * build_joinrel_tlist
1208 : : * Builds a join relation's target list from an input relation.
1209 : : * (This is invoked twice to handle the two input relations.)
1210 : : *
1211 : : * The join's targetlist includes all Vars of its member relations that
1212 : : * will still be needed above the join. This subroutine adds all such
1213 : : * Vars from the specified input rel's tlist to the join rel's tlist.
1214 : : * Likewise for any PlaceHolderVars emitted by the input rel.
1215 : : *
1216 : : * We also compute the expected width of the join's output, making use
1217 : : * of data that was cached at the baserel level by set_rel_width().
1218 : : *
1219 : : * Pass can_null as true if the join is an outer join that can null Vars
1220 : : * from this input relation. If so, we will (normally) add the join's relid
1221 : : * to the nulling bitmaps of Vars and PHVs bubbled up from the input.
1222 : : *
1223 : : * When forming an outer join's target list, special handling is needed in
1224 : : * case the outer join was commuted with another one per outer join identity 3
1225 : : * (see optimizer/README). We must take steps to ensure that the output Vars
1226 : : * have the same nulling bitmaps that they would if the two joins had been
1227 : : * done in syntactic order; else they won't match Vars appearing higher in
1228 : : * the query tree. An exception to the match-the-syntactic-order rule is
1229 : : * that when an outer join is pushed down into another one's RHS per identity
1230 : : * 3, we can't mark its Vars as nulled until the now-upper outer join is also
1231 : : * completed. So we need to do three things:
1232 : : *
1233 : : * First, we add the outer join's relid to the nulling bitmap only if the
1234 : : * outer join has been completely performed and the Var or PHV actually
1235 : : * comes from within the syntactically nullable side(s) of the outer join.
1236 : : * This takes care of the possibility that we have transformed
1237 : : * (A leftjoin B on (Pab)) leftjoin C on (Pbc)
1238 : : * to
1239 : : * A leftjoin (B leftjoin C on (Pbc)) on (Pab)
1240 : : * Here the pushed-down B/C join cannot mark C columns as nulled yet,
1241 : : * while the now-upper A/B join must not mark C columns as nulled by itself.
1242 : : *
1243 : : * Second, perform the same operation for each SpecialJoinInfo listed in
1244 : : * pushed_down_joins (which, in this example, would be the B/C join when
1245 : : * we are at the now-upper A/B join). This allows the now-upper join to
1246 : : * complete the marking of "C" Vars that now have fully valid values.
1247 : : *
1248 : : * Third, any relid in sjinfo->commute_above_r that is already part of
1249 : : * the joinrel is added to the nulling bitmaps of nullable Vars and PHVs.
1250 : : * This takes care of the reverse case where we implement
1251 : : * A leftjoin (B leftjoin C on (Pbc)) on (Pab)
1252 : : * as
1253 : : * (A leftjoin B on (Pab)) leftjoin C on (Pbc)
1254 : : * The C columns emitted by the B/C join need to be shown as nulled by both
1255 : : * the B/C and A/B joins, even though they've not physically traversed the
1256 : : * A/B join.
1257 : : */
1258 : : static void
7587 1259 : 259812 : build_joinrel_tlist(PlannerInfo *root, RelOptInfo *joinrel,
1260 : : RelOptInfo *input_rel,
1261 : : SpecialJoinInfo *sjinfo,
1262 : : List *pushed_down_joins,
1263 : : bool can_null)
1264 : : {
2753 efujita@postgresql.o 1265 : 259812 : Relids relids = joinrel->relids;
817 tgl@sss.pgh.pa.us 1266 : 259812 : int64 tuple_width = joinrel->reltarget->width;
1267 : : ListCell *vars;
1268 : : ListCell *lc;
1269 : :
3653 1270 [ + + + + : 1328621 : foreach(vars, input_rel->reltarget->exprs)
+ + ]
1271 : : {
4949 1272 : 1068809 : Var *var = (Var *) lfirst(vars);
1273 : :
1274 : : /*
1275 : : * For a PlaceHolderVar, we have to look up the PlaceHolderInfo.
1276 : : */
1277 [ + + ]: 1068809 : if (IsA(var, PlaceHolderVar))
1306 1278 : 1076 : {
1279 : 1076 : PlaceHolderVar *phv = (PlaceHolderVar *) var;
1280 : 1076 : PlaceHolderInfo *phinfo = find_placeholder_info(root, phv);
1281 : :
1282 : : /* Is it still needed above this joinrel? */
1283 [ + + ]: 1076 : if (bms_nonempty_difference(phinfo->ph_needed, relids))
1284 : : {
1285 : : /*
1286 : : * Yup, add it to the output. If this join potentially nulls
1287 : : * this input, we have to update the PHV's phnullingrels,
1288 : : * which means making a copy.
1289 : : */
1140 1290 [ + + ]: 818 : if (can_null)
1291 : : {
1292 : 533 : phv = copyObject(phv);
1293 : : /* See comments above to understand this logic */
1294 [ + - + + ]: 1066 : if (sjinfo->ojrelid != 0 &&
1033 1295 [ + + ]: 1054 : bms_is_member(sjinfo->ojrelid, relids) &&
1132 1296 : 521 : (bms_is_subset(phv->phrels, sjinfo->syn_righthand) ||
1297 [ + + + - ]: 156 : (sjinfo->jointype == JOIN_FULL &&
1298 : 75 : bms_is_subset(phv->phrels, sjinfo->syn_lefthand))))
1140 1299 : 515 : phv->phnullingrels = bms_add_member(phv->phnullingrels,
1300 : 515 : sjinfo->ojrelid);
1033 1301 [ + + + + : 542 : foreach(lc, pushed_down_joins)
+ + ]
1302 : : {
1303 : 9 : SpecialJoinInfo *othersj = (SpecialJoinInfo *) lfirst(lc);
1304 : :
1305 [ - + ]: 9 : Assert(bms_is_member(othersj->ojrelid, relids));
1306 [ + + ]: 9 : if (bms_is_subset(phv->phrels, othersj->syn_righthand))
1307 : 6 : phv->phnullingrels = bms_add_member(phv->phnullingrels,
1308 : 6 : othersj->ojrelid);
1309 : : }
1131 1310 : 533 : phv->phnullingrels =
1311 : 533 : bms_join(phv->phnullingrels,
1312 : 533 : bms_intersect(sjinfo->commute_above_r,
1313 : : relids));
1314 : : }
1315 : :
1306 1316 : 818 : joinrel->reltarget->exprs = lappend(joinrel->reltarget->exprs,
1317 : : phv);
1318 : : /* Bubbling up the precomputed result has cost zero */
817 1319 : 818 : tuple_width += phinfo->ph_width;
1320 : : }
6354 1321 : 1076 : continue;
1322 : : }
1323 : :
1324 : : /*
1325 : : * Otherwise, anything in a baserel or joinrel targetlist ought to be
1326 : : * a Var. (More general cases can only appear in appendrel child
1327 : : * rels, which will never be seen here.)
1328 : : */
2753 efujita@postgresql.o 1329 [ - + ]: 1067733 : if (!IsA(var, Var))
3678 tgl@sss.pgh.pa.us 1330 [ # # ]:UBC 0 : elog(ERROR, "unexpected node type in rel targetlist: %d",
1331 : : (int) nodeTag(var));
1332 : :
1810 tgl@sss.pgh.pa.us 1333 [ + + ]:CBC 1067733 : if (var->varno == ROWID_VAR)
1334 : : {
1335 : : /* UPDATE/DELETE/MERGE row identity vars are always needed */
1336 : : RowIdentityVarInfo *ridinfo = (RowIdentityVarInfo *)
1031 1337 : 628 : list_nth(root->row_identity_vars, var->varattno - 1);
1338 : :
1339 : : /* Update reltarget width estimate from RowIdentityVarInfo */
817 1340 : 628 : tuple_width += ridinfo->rowidwidth;
1341 : : }
1342 : : else
1343 : : {
1344 : : RelOptInfo *baserel;
1345 : : int ndx;
1346 : :
1347 : : /* Get the Var's original base rel */
1810 1348 : 1067105 : baserel = find_base_rel(root, var->varno);
1349 : :
1350 : : /* Is it still needed above this joinrel? */
1351 : 1067105 : ndx = var->varattno - baserel->min_attr;
1140 1352 [ + + ]: 1067105 : if (!bms_nonempty_difference(baserel->attr_needed[ndx], relids))
1353 : 196962 : continue; /* nope, skip it */
1354 : :
1355 : : /* Update reltarget width estimate from baserel's attr_widths */
817 1356 : 870143 : tuple_width += baserel->attr_widths[ndx];
1357 : : }
1358 : :
1359 : : /*
1360 : : * Add the Var to the output. If this join potentially nulls this
1361 : : * input, we have to update the Var's varnullingrels, which means
1362 : : * making a copy. But note that we don't ever add nullingrel bits to
1363 : : * row identity Vars (cf. comments in setrefs.c).
1364 : : */
1132 1365 [ + + + + ]: 870771 : if (can_null && var->varno != ROWID_VAR)
1366 : : {
1140 1367 : 83571 : var = copyObject(var);
1368 : : /* See comments above to understand this logic */
1369 [ + + + + ]: 166783 : if (sjinfo->ojrelid != 0 &&
1033 1370 [ + + ]: 163675 : bms_is_member(sjinfo->ojrelid, relids) &&
1132 1371 : 80463 : (bms_is_member(var->varno, sjinfo->syn_righthand) ||
1372 [ + + + - ]: 1992 : (sjinfo->jointype == JOIN_FULL &&
1373 : 930 : bms_is_member(var->varno, sjinfo->syn_lefthand))))
1140 1374 : 80331 : var->varnullingrels = bms_add_member(var->varnullingrels,
1375 : 80331 : sjinfo->ojrelid);
1033 1376 [ + + + + : 83910 : foreach(lc, pushed_down_joins)
+ + ]
1377 : : {
1378 : 339 : SpecialJoinInfo *othersj = (SpecialJoinInfo *) lfirst(lc);
1379 : :
1380 [ - + ]: 339 : Assert(bms_is_member(othersj->ojrelid, relids));
1381 [ + + ]: 339 : if (bms_is_member(var->varno, othersj->syn_righthand))
1382 : 132 : var->varnullingrels = bms_add_member(var->varnullingrels,
1383 : 132 : othersj->ojrelid);
1384 : : }
1131 1385 : 83571 : var->varnullingrels =
1386 : 83571 : bms_join(var->varnullingrels,
1387 : 83571 : bms_intersect(sjinfo->commute_above_r,
1388 : : relids));
1389 : : }
1390 : :
1140 1391 : 870771 : joinrel->reltarget->exprs = lappend(joinrel->reltarget->exprs,
1392 : : var);
1393 : :
1394 : : /* Vars have cost zero, so no need to adjust reltarget->cost */
1395 : : }
1396 : :
817 1397 : 259812 : joinrel->reltarget->width = clamp_width_est(tuple_width);
9533 1398 : 259812 : }
1399 : :
1400 : : /*
1401 : : * build_joinrel_restrictlist
1402 : : * build_joinrel_joinlist
1403 : : * These routines build lists of restriction and join clauses for a
1404 : : * join relation from the joininfo lists of the relations it joins.
1405 : : *
1406 : : * These routines are separate because the restriction list must be
1407 : : * built afresh for each pair of input sub-relations we consider, whereas
1408 : : * the join list need only be computed once for any join RelOptInfo.
1409 : : * The join list is fully determined by the set of rels making up the
1410 : : * joinrel, so we should get the same results (up to ordering) from any
1411 : : * candidate pair of sub-relations. But the restriction list is whatever
1412 : : * is not handled in the sub-relations, so it depends on which
1413 : : * sub-relations are considered.
1414 : : *
1415 : : * If a join clause from an input relation refers to base+OJ rels still not
1416 : : * present in the joinrel, then it is still a join clause for the joinrel;
1417 : : * we put it into the joininfo list for the joinrel. Otherwise,
1418 : : * the clause is now a restrict clause for the joined relation, and we
1419 : : * return it to the caller of build_joinrel_restrictlist() to be stored in
1420 : : * join paths made from this pair of sub-relations. (It will not need to
1421 : : * be considered further up the join tree.)
1422 : : *
1423 : : * In many cases we will find the same RestrictInfos in both input
1424 : : * relations' joinlists, so be careful to eliminate duplicates.
1425 : : * Pointer equality should be a sufficient test for dups, since all
1426 : : * the various joinlist entries ultimately refer to RestrictInfos
1427 : : * pushed into them by distribute_restrictinfo_to_rels().
1428 : : *
1429 : : * 'joinrel' is a join relation node
1430 : : * 'outer_rel' and 'inner_rel' are a pair of relations that can be joined
1431 : : * to form joinrel.
1432 : : * 'sjinfo': join context info
1433 : : *
1434 : : * build_joinrel_restrictlist() returns a list of relevant restrictinfos,
1435 : : * whereas build_joinrel_joinlist() stores its results in the joinrel's
1436 : : * joininfo list. One or the other must accept each given clause!
1437 : : *
1438 : : * NB: Formerly, we made deep(!) copies of each input RestrictInfo to pass
1439 : : * up to the join relation. I believe this is no longer necessary, because
1440 : : * RestrictInfo nodes are no longer context-dependent. Instead, just include
1441 : : * the original nodes in the lists made for the join relation.
1442 : : */
1443 : : static List *
7588 1444 : 204638 : build_joinrel_restrictlist(PlannerInfo *root,
1445 : : RelOptInfo *joinrel,
1446 : : RelOptInfo *outer_rel,
1447 : : RelOptInfo *inner_rel,
1448 : : SpecialJoinInfo *sjinfo)
1449 : : {
1450 : : List *result;
1451 : : Relids both_input_relids;
1452 : :
1140 1453 : 204638 : both_input_relids = bms_union(outer_rel->relids, inner_rel->relids);
1454 : :
1455 : : /*
1456 : : * Collect all the clauses that syntactically belong at this level,
1457 : : * eliminating any duplicates (important since we will see many of the
1458 : : * same clauses arriving from both input relations).
1459 : : */
1460 : 204638 : result = subbuild_joinrel_restrictlist(root, joinrel, outer_rel,
1461 : : both_input_relids, NIL);
1462 : 204638 : result = subbuild_joinrel_restrictlist(root, joinrel, inner_rel,
1463 : : both_input_relids, result);
1464 : :
1465 : : /*
1466 : : * Add on any clauses derived from EquivalenceClasses. These cannot be
1467 : : * redundant with the clauses in the joininfo lists, so don't bother
1468 : : * checking.
1469 : : */
6994 1470 : 204638 : result = list_concat(result,
1471 : 204638 : generate_join_implied_equalities(root,
1472 : : joinrel->relids,
1473 : : outer_rel->relids,
1474 : : inner_rel,
1475 : : sjinfo));
1476 : :
8914 1477 : 204638 : return result;
1478 : : }
1479 : :
1480 : : static void
9533 1481 : 129906 : build_joinrel_joinlist(RelOptInfo *joinrel,
1482 : : RelOptInfo *outer_rel,
1483 : : RelOptInfo *inner_rel)
1484 : : {
1485 : : List *result;
1486 : :
1487 : : /*
1488 : : * Collect all the clauses that syntactically belong above this level,
1489 : : * eliminating any duplicates (important since we will see many of the
1490 : : * same clauses arriving from both input relations).
1491 : : */
6994 1492 : 129906 : result = subbuild_joinrel_joinlist(joinrel, outer_rel->joininfo, NIL);
1493 : 129906 : result = subbuild_joinrel_joinlist(joinrel, inner_rel->joininfo, result);
1494 : :
1495 : 129906 : joinrel->joininfo = result;
9533 1496 : 129906 : }
1497 : :
1498 : : static List *
1140 1499 : 409276 : subbuild_joinrel_restrictlist(PlannerInfo *root,
1500 : : RelOptInfo *joinrel,
1501 : : RelOptInfo *input_rel,
1502 : : Relids both_input_relids,
1503 : : List *new_restrictlist)
1504 : : {
1505 : : ListCell *l;
1506 : :
1507 [ + + + + : 774132 : foreach(l, input_rel->joininfo)
+ + ]
1508 : : {
7584 1509 : 364856 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
1510 : :
1511 [ + + ]: 364856 : if (bms_is_subset(rinfo->required_relids, joinrel->relids))
1512 : : {
1513 : : /*
1514 : : * This clause should become a restriction clause for the joinrel,
1515 : : * since it refers to no outside rels. However, if it's a clone
1516 : : * clause then it might be too late to evaluate it, so we have to
1517 : : * check. (If it is too late, just ignore the clause, taking it
1518 : : * on faith that another clone was or will be selected.) Clone
1519 : : * clauses should always be outer-join clauses, so we compare
1520 : : * against both_input_relids.
1521 : : */
1140 1522 [ + + + + ]: 218818 : if (rinfo->has_clone || rinfo->is_clone)
1523 : : {
1524 [ + - - + ]: 35173 : Assert(!RINFO_IS_PUSHED_DOWN(rinfo, joinrel->relids));
1525 [ + + ]: 35173 : if (!bms_is_subset(rinfo->required_relids, both_input_relids))
1526 : 5935 : continue;
1025 1527 [ + + ]: 29238 : if (bms_overlap(rinfo->incompatible_relids, both_input_relids))
1140 1528 : 11728 : continue;
1529 : : }
1530 : : else
1531 : : {
1532 : : /*
1533 : : * For non-clone clauses, we just Assert it's OK. These might
1534 : : * be either join or filter clauses; if it's a join clause
1535 : : * then it should not refer to the current join's output.
1536 : : * (There is little point in checking incompatible_relids,
1537 : : * because it'll be NULL.)
1538 : : */
1025 1539 [ + + + - : 183645 : Assert(RINFO_IS_PUSHED_DOWN(rinfo, joinrel->relids) ||
- + ]
1540 : : bms_is_subset(rinfo->required_relids,
1541 : : both_input_relids));
1542 : : }
1543 : :
1544 : : /*
1545 : : * OK, so add it to the list, being careful to eliminate
1546 : : * duplicates. (Since RestrictInfo nodes in different joinlists
1547 : : * will have been multiply-linked rather than copied, pointer
1548 : : * equality should be a sufficient test.)
1549 : : */
6994 1550 : 201155 : new_restrictlist = list_append_unique_ptr(new_restrictlist, rinfo);
1551 : : }
1552 : : else
1553 : : {
1554 : : /*
1555 : : * This clause is still a join clause at this level, so we ignore
1556 : : * it in this routine.
1557 : : */
1558 : : }
1559 : : }
1560 : :
1561 : 409276 : return new_restrictlist;
1562 : : }
1563 : :
1564 : : static List *
9533 1565 : 259812 : subbuild_joinrel_joinlist(RelOptInfo *joinrel,
1566 : : List *joininfo_list,
1567 : : List *new_joininfo)
1568 : : {
1569 : : ListCell *l;
1570 : :
1571 : : /* Expected to be called only for join between parent relations. */
3082 rhaas@postgresql.org 1572 [ - + ]: 259812 : Assert(joinrel->reloptkind == RELOPT_JOINREL);
1573 : :
7584 tgl@sss.pgh.pa.us 1574 [ + + + + : 487160 : foreach(l, joininfo_list)
+ + ]
1575 : : {
1576 : 227348 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
1577 : :
1578 [ + + ]: 227348 : if (bms_is_subset(rinfo->required_relids, joinrel->relids))
1579 : : {
1580 : : /*
1581 : : * This clause becomes a restriction clause for the joinrel, since
1582 : : * it refers to no outside rels. So we can ignore it in this
1583 : : * routine.
1584 : : */
1585 : : }
1586 : : else
1587 : : {
1588 : : /*
1589 : : * This clause is still a join clause at this level, so add it to
1590 : : * the new joininfo list, being careful to eliminate duplicates.
1591 : : * (Since RestrictInfo nodes in different joinlists will have been
1592 : : * multiply-linked rather than copied, pointer equality should be
1593 : : * a sufficient test.)
1594 : : */
6994 1595 : 87304 : new_joininfo = list_append_unique_ptr(new_joininfo, rinfo);
1596 : : }
1597 : : }
1598 : :
1599 : 259812 : return new_joininfo;
1600 : : }
1601 : :
1602 : :
1603 : : /*
1604 : : * fetch_upper_rel
1605 : : * Build a RelOptInfo describing some post-scan/join query processing,
1606 : : * or return a pre-existing one if somebody already built it.
1607 : : *
1608 : : * An "upper" relation is identified by an UpperRelationKind and a Relids set.
1609 : : * The meaning of the Relids set is not specified here, and very likely will
1610 : : * vary for different relation kinds.
1611 : : *
1612 : : * Most of the fields in an upper-level RelOptInfo are not used and are not
1613 : : * set here (though makeNode should ensure they're zeroes). We basically only
1614 : : * care about fields that are of interest to add_path() and set_cheapest().
1615 : : */
1616 : : RelOptInfo *
3660 1617 : 975301 : fetch_upper_rel(PlannerInfo *root, UpperRelationKind kind, Relids relids)
1618 : : {
1619 : : RelOptInfo *upperrel;
1620 : : ListCell *lc;
1621 : :
1622 : : /*
1623 : : * For the moment, our indexing data structure is just a List for each
1624 : : * relation kind. If we ever get so many of one kind that this stops
1625 : : * working well, we can improve it. No code outside this function should
1626 : : * assume anything about how to find a particular upperrel.
1627 : : */
1628 : :
1629 : : /* If we already made this upperrel for the query, return it */
1630 [ + + + + : 980923 : foreach(lc, root->upper_rels[kind])
+ + ]
1631 : : {
1632 : 621042 : upperrel = (RelOptInfo *) lfirst(lc);
1633 : :
1634 [ + + ]: 621042 : if (bms_equal(upperrel->relids, relids))
1635 : 615420 : return upperrel;
1636 : : }
1637 : :
1638 : 359881 : upperrel = makeNode(RelOptInfo);
1639 : 359881 : upperrel->reloptkind = RELOPT_UPPER_REL;
1640 : 359881 : upperrel->relids = bms_copy(relids);
46 rhaas@postgresql.org 1641 :GNC 359881 : upperrel->pgs_mask = root->glob->default_pgs_mask;
1642 : :
1643 : : /* cheap startup cost is interesting iff not all tuples to be retrieved */
3660 tgl@sss.pgh.pa.us 1644 :CBC 359881 : upperrel->consider_startup = (root->tuple_fraction > 0);
1645 : 359881 : upperrel->consider_param_startup = false;
3189 1646 : 359881 : upperrel->consider_parallel = false; /* might get changed later */
3653 1647 : 359881 : upperrel->reltarget = create_empty_pathtarget();
3660 1648 : 359881 : upperrel->pathlist = NIL;
1649 : 359881 : upperrel->cheapest_startup_path = NULL;
1650 : 359881 : upperrel->cheapest_total_path = NULL;
1651 : 359881 : upperrel->cheapest_parameterized_paths = NIL;
1652 : :
1653 : 359881 : root->upper_rels[kind] = lappend(root->upper_rels[kind], upperrel);
1654 : :
1655 : 359881 : return upperrel;
1656 : : }
1657 : :
1658 : :
1659 : : /*
1660 : : * find_childrel_parents
1661 : : * Compute the set of parent relids of an appendrel child rel.
1662 : : *
1663 : : * Since appendrels can be nested, a child could have multiple levels of
1664 : : * appendrel ancestors. This function computes a Relids set of all the
1665 : : * parent relation IDs.
1666 : : */
1667 : : Relids
4183 1668 : 6855 : find_childrel_parents(PlannerInfo *root, RelOptInfo *rel)
1669 : : {
1670 : 6855 : Relids result = NULL;
1671 : :
3268 rhaas@postgresql.org 1672 [ - + ]: 6855 : Assert(rel->reloptkind == RELOPT_OTHER_MEMBER_REL);
2819 alvherre@alvh.no-ip. 1673 [ + - - + ]: 6855 : Assert(rel->relid > 0 && rel->relid < root->simple_rel_array_size);
1674 : :
1675 : : do
1676 : : {
1677 : 8233 : AppendRelInfo *appinfo = root->append_rel_array[rel->relid];
4183 tgl@sss.pgh.pa.us 1678 : 8233 : Index prelid = appinfo->parent_relid;
1679 : :
1680 : 8233 : result = bms_add_member(result, prelid);
1681 : :
1682 : : /* traverse up to the parent rel, loop if it's also a child rel */
1683 : 8233 : rel = find_base_rel(root, prelid);
1684 [ + + ]: 8233 : } while (rel->reloptkind == RELOPT_OTHER_MEMBER_REL);
1685 : :
1686 [ - + ]: 6855 : Assert(rel->reloptkind == RELOPT_BASEREL);
1687 : :
1688 : 6855 : return result;
1689 : : }
1690 : :
1691 : :
1692 : : /*
1693 : : * get_baserel_parampathinfo
1694 : : * Get the ParamPathInfo for a parameterized path for a base relation,
1695 : : * constructing one if we don't have one already.
1696 : : *
1697 : : * This centralizes estimating the rowcounts for parameterized paths.
1698 : : * We need to cache those to be sure we use the same rowcount for all paths
1699 : : * of the same parameterization for a given rel. This is also a convenient
1700 : : * place to determine which movable join clauses the parameterized path will
1701 : : * be responsible for evaluating.
1702 : : */
1703 : : ParamPathInfo *
5078 1704 : 1083732 : get_baserel_parampathinfo(PlannerInfo *root, RelOptInfo *baserel,
1705 : : Relids required_outer)
1706 : : {
1707 : : ParamPathInfo *ppi;
1708 : : Relids joinrelids;
1709 : : List *pclauses;
1710 : : List *eqclauses;
1711 : : Bitmapset *pserials;
1712 : : double rows;
1713 : : ListCell *lc;
1714 : :
1715 : : /* If rel has LATERAL refs, every path for it should account for them */
2593 1716 [ - + ]: 1083732 : Assert(bms_is_subset(baserel->lateral_relids, required_outer));
1717 : :
1718 : : /* Unparameterized paths have no ParamPathInfo */
5078 1719 [ + + ]: 1083732 : if (bms_is_empty(required_outer))
1720 : 876157 : return NULL;
1721 : :
1722 [ - + ]: 207575 : Assert(!bms_overlap(baserel->relids, required_outer));
1723 : :
1724 : : /* If we already have a PPI for this parameterization, just return it */
3134 rhaas@postgresql.org 1725 [ + + ]: 207575 : if ((ppi = find_param_path_info(baserel, required_outer)))
1726 : 111443 : return ppi;
1727 : :
1728 : : /*
1729 : : * Identify all joinclauses that are movable to this base rel given this
1730 : : * parameterization.
1731 : : */
5078 tgl@sss.pgh.pa.us 1732 : 96132 : joinrelids = bms_union(baserel->relids, required_outer);
1733 : 96132 : pclauses = NIL;
1734 [ + + + + : 153765 : foreach(lc, baserel->joininfo)
+ + ]
1735 : : {
1736 : 57633 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1737 : :
1738 [ + + ]: 57633 : if (join_clause_is_movable_into(rinfo,
1739 : : baserel->relids,
1740 : : joinrelids))
1741 : 24709 : pclauses = lappend(pclauses, rinfo);
1742 : : }
1743 : :
1744 : : /*
1745 : : * Add in joinclauses generated by EquivalenceClasses, too. (These
1746 : : * necessarily satisfy join_clause_is_movable_into; but in assert-enabled
1747 : : * builds, let's verify that.)
1748 : : */
698 1749 : 96132 : eqclauses = generate_join_implied_equalities(root,
1750 : : joinrelids,
1751 : : required_outer,
1752 : : baserel,
1753 : : NULL);
1754 : : #ifdef USE_ASSERT_CHECKING
1755 [ + + + + : 176022 : foreach(lc, eqclauses)
+ + ]
1756 : : {
1757 : 79890 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1758 : :
1759 [ - + ]: 79890 : Assert(join_clause_is_movable_into(rinfo,
1760 : : baserel->relids,
1761 : : joinrelids));
1762 : : }
1763 : : #endif
1764 : 96132 : pclauses = list_concat(pclauses, eqclauses);
1765 : :
1766 : : /* Compute set of serial numbers of the enforced clauses */
1140 1767 : 96132 : pserials = NULL;
1768 [ + + + + : 200731 : foreach(lc, pclauses)
+ + ]
1769 : : {
1770 : 104599 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1771 : :
1772 : 104599 : pserials = bms_add_member(pserials, rinfo->rinfo_serial);
1773 : : }
1774 : :
1775 : : /* Estimate the number of rows returned by the parameterized scan */
5078 1776 : 96132 : rows = get_parameterized_baserel_size(root, baserel, pclauses);
1777 : :
1778 : : /* And now we can build the ParamPathInfo */
1779 : 96132 : ppi = makeNode(ParamPathInfo);
1780 : 96132 : ppi->ppi_req_outer = required_outer;
1781 : 96132 : ppi->ppi_rows = rows;
1782 : 96132 : ppi->ppi_clauses = pclauses;
1140 1783 : 96132 : ppi->ppi_serials = pserials;
5078 1784 : 96132 : baserel->ppilist = lappend(baserel->ppilist, ppi);
1785 : :
1786 : 96132 : return ppi;
1787 : : }
1788 : :
1789 : : /*
1790 : : * get_joinrel_parampathinfo
1791 : : * Get the ParamPathInfo for a parameterized path for a join relation,
1792 : : * constructing one if we don't have one already.
1793 : : *
1794 : : * This centralizes estimating the rowcounts for parameterized paths.
1795 : : * We need to cache those to be sure we use the same rowcount for all paths
1796 : : * of the same parameterization for a given rel. This is also a convenient
1797 : : * place to determine which movable join clauses the parameterized path will
1798 : : * be responsible for evaluating.
1799 : : *
1800 : : * outer_path and inner_path are a pair of input paths that can be used to
1801 : : * construct the join, and restrict_clauses is the list of regular join
1802 : : * clauses (including clauses derived from EquivalenceClasses) that must be
1803 : : * applied at the join node when using these inputs.
1804 : : *
1805 : : * Unlike the situation for base rels, the set of movable join clauses to be
1806 : : * enforced at a join varies with the selected pair of input paths, so we
1807 : : * must calculate that and pass it back, even if we already have a matching
1808 : : * ParamPathInfo. We handle this by adding any clauses moved down to this
1809 : : * join to *restrict_clauses, which is an in/out parameter. (The addition
1810 : : * is done in such a way as to not modify the passed-in List structure.)
1811 : : *
1812 : : * Note: when considering a nestloop join, the caller must have removed from
1813 : : * restrict_clauses any movable clauses that are themselves scheduled to be
1814 : : * pushed into the right-hand path. We do not do that here since it's
1815 : : * unnecessary for other join types.
1816 : : */
1817 : : ParamPathInfo *
1818 : 1402103 : get_joinrel_parampathinfo(PlannerInfo *root, RelOptInfo *joinrel,
1819 : : Path *outer_path,
1820 : : Path *inner_path,
1821 : : SpecialJoinInfo *sjinfo,
1822 : : Relids required_outer,
1823 : : List **restrict_clauses)
1824 : : {
1825 : : ParamPathInfo *ppi;
1826 : : Relids join_and_req;
1827 : : Relids outer_and_req;
1828 : : Relids inner_and_req;
1829 : : List *pclauses;
1830 : : List *eclauses;
1831 : : List *dropped_ecs;
1832 : : double rows;
1833 : : ListCell *lc;
1834 : :
1835 : : /* If rel has LATERAL refs, every path for it should account for them */
2593 1836 [ - + ]: 1402103 : Assert(bms_is_subset(joinrel->lateral_relids, required_outer));
1837 : :
1838 : : /* Unparameterized paths have no ParamPathInfo or extra join clauses */
5078 1839 [ + + ]: 1402103 : if (bms_is_empty(required_outer))
1840 : 1376322 : return NULL;
1841 : :
1842 [ - + ]: 25781 : Assert(!bms_overlap(joinrel->relids, required_outer));
1843 : :
1844 : : /*
1845 : : * Identify all joinclauses that are movable to this join rel given this
1846 : : * parameterization. These are the clauses that are movable into this
1847 : : * join, but not movable into either input path. Treat an unparameterized
1848 : : * input path as not accepting parameterized clauses (because it won't,
1849 : : * per the shortcut exit above), even though the joinclause movement rules
1850 : : * might allow the same clauses to be moved into a parameterized path for
1851 : : * that rel.
1852 : : */
1853 : 25781 : join_and_req = bms_union(joinrel->relids, required_outer);
1854 [ + + ]: 25781 : if (outer_path->param_info)
1855 : 20354 : outer_and_req = bms_union(outer_path->parent->relids,
1856 [ + - ]: 20354 : PATH_REQ_OUTER(outer_path));
1857 : : else
5026 bruce@momjian.us 1858 : 5427 : outer_and_req = NULL; /* outer path does not accept parameters */
5078 tgl@sss.pgh.pa.us 1859 [ + + ]: 25781 : if (inner_path->param_info)
1860 : 13964 : inner_and_req = bms_union(inner_path->parent->relids,
1861 [ + - ]: 13964 : PATH_REQ_OUTER(inner_path));
1862 : : else
5026 bruce@momjian.us 1863 : 11817 : inner_and_req = NULL; /* inner path does not accept parameters */
1864 : :
5078 tgl@sss.pgh.pa.us 1865 : 25781 : pclauses = NIL;
1866 [ + + + + : 52202 : foreach(lc, joinrel->joininfo)
+ + ]
1867 : : {
1868 : 26421 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1869 : :
1870 [ + + ]: 26421 : if (join_clause_is_movable_into(rinfo,
1871 : : joinrel->relids,
1872 : 12790 : join_and_req) &&
1873 [ + + ]: 12790 : !join_clause_is_movable_into(rinfo,
1874 : 12790 : outer_path->parent->relids,
1875 : 392 : outer_and_req) &&
1876 [ + + ]: 392 : !join_clause_is_movable_into(rinfo,
1877 : 392 : inner_path->parent->relids,
1878 : : inner_and_req))
1879 : 48 : pclauses = lappend(pclauses, rinfo);
1880 : : }
1881 : :
1882 : : /* Consider joinclauses generated by EquivalenceClasses, too */
1883 : 25781 : eclauses = generate_join_implied_equalities(root,
1884 : : join_and_req,
1885 : : required_outer,
1886 : : joinrel,
1887 : : NULL);
1888 : : /* We only want ones that aren't movable to lower levels */
3607 1889 : 25781 : dropped_ecs = NIL;
5078 1890 [ + + + + : 37204 : foreach(lc, eclauses)
+ + ]
1891 : : {
1892 : 11423 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1893 : :
1894 [ - + ]: 11423 : Assert(join_clause_is_movable_into(rinfo,
1895 : : joinrel->relids,
1896 : : join_and_req));
3607 1897 [ + + ]: 11423 : if (join_clause_is_movable_into(rinfo,
1898 : 11423 : outer_path->parent->relids,
1899 : : outer_and_req))
1900 : 5587 : continue; /* drop if movable into LHS */
1901 [ + + ]: 5836 : if (join_clause_is_movable_into(rinfo,
1902 : 5836 : inner_path->parent->relids,
1903 : : inner_and_req))
1904 : : {
1905 : : /* drop if movable into RHS, but remember EC for use below */
1906 [ - + ]: 4343 : Assert(rinfo->left_ec == rinfo->right_ec);
1907 : 4343 : dropped_ecs = lappend(dropped_ecs, rinfo->left_ec);
1908 : 4343 : continue;
1909 : : }
1910 : 1493 : pclauses = lappend(pclauses, rinfo);
1911 : : }
1912 : :
1913 : : /*
1914 : : * EquivalenceClasses are harder to deal with than we could wish, because
1915 : : * of the fact that a given EC can generate different clauses depending on
1916 : : * context. Suppose we have an EC {X.X, Y.Y, Z.Z} where X and Y are the
1917 : : * LHS and RHS of the current join and Z is in required_outer, and further
1918 : : * suppose that the inner_path is parameterized by both X and Z. The code
1919 : : * above will have produced either Z.Z = X.X or Z.Z = Y.Y from that EC,
1920 : : * and in the latter case will have discarded it as being movable into the
1921 : : * RHS. However, the EC machinery might have produced either Y.Y = X.X or
1922 : : * Y.Y = Z.Z as the EC enforcement clause within the inner_path; it will
1923 : : * not have produced both, and we can't readily tell from here which one
1924 : : * it did pick. If we add no clause to this join, we'll end up with
1925 : : * insufficient enforcement of the EC; either Z.Z or X.X will fail to be
1926 : : * constrained to be equal to the other members of the EC. (When we come
1927 : : * to join Z to this X/Y path, we will certainly drop whichever EC clause
1928 : : * is generated at that join, so this omission won't get fixed later.)
1929 : : *
1930 : : * To handle this, for each EC we discarded such a clause from, try to
1931 : : * generate a clause connecting the required_outer rels to the join's LHS
1932 : : * ("Z.Z = X.X" in the terms of the above example). If successful, and if
1933 : : * the clause can't be moved to the LHS, add it to the current join's
1934 : : * restriction clauses. (If an EC cannot generate such a clause then it
1935 : : * has nothing that needs to be enforced here, while if the clause can be
1936 : : * moved into the LHS then it should have been enforced within that path.)
1937 : : *
1938 : : * Note that we don't need similar processing for ECs whose clause was
1939 : : * considered to be movable into the LHS, because the LHS can't refer to
1940 : : * the RHS so there is no comparable ambiguity about what it might
1941 : : * actually be enforcing internally.
1942 : : */
1943 [ + + ]: 25781 : if (dropped_ecs)
1944 : : {
1945 : : Relids real_outer_and_req;
1946 : :
1947 : 3995 : real_outer_and_req = bms_union(outer_path->parent->relids,
1948 : : required_outer);
1949 : : eclauses =
1950 : 3995 : generate_join_implied_equalities_for_ecs(root,
1951 : : dropped_ecs,
1952 : : real_outer_and_req,
1953 : : required_outer,
1954 : : outer_path->parent);
1955 [ + + + + : 4145 : foreach(lc, eclauses)
+ + ]
1956 : : {
1957 : 150 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1958 : :
1959 [ - + ]: 150 : Assert(join_clause_is_movable_into(rinfo,
1960 : : outer_path->parent->relids,
1961 : : real_outer_and_req));
1962 [ + + ]: 150 : if (!join_clause_is_movable_into(rinfo,
1963 : 150 : outer_path->parent->relids,
1964 : : outer_and_req))
1965 : 135 : pclauses = lappend(pclauses, rinfo);
1966 : : }
1967 : : }
1968 : :
1969 : : /*
1970 : : * Now, attach the identified moved-down clauses to the caller's
1971 : : * restrict_clauses list. By using list_concat in this order, we leave
1972 : : * the original list structure of restrict_clauses undamaged.
1973 : : */
5078 1974 : 25781 : *restrict_clauses = list_concat(pclauses, *restrict_clauses);
1975 : :
1976 : : /* If we already have a PPI for this parameterization, just return it */
3134 rhaas@postgresql.org 1977 [ + + ]: 25781 : if ((ppi = find_param_path_info(joinrel, required_outer)))
1978 : 19052 : return ppi;
1979 : :
1980 : : /* Estimate the number of rows returned by the parameterized join */
5078 tgl@sss.pgh.pa.us 1981 : 6729 : rows = get_parameterized_joinrel_size(root, joinrel,
1982 : : outer_path,
1983 : : inner_path,
1984 : : sjinfo,
1985 : : *restrict_clauses);
1986 : :
1987 : : /*
1988 : : * And now we can build the ParamPathInfo. No point in saving the
1989 : : * input-pair-dependent clause list, though.
1990 : : *
1991 : : * Note: in GEQO mode, we'll be called in a temporary memory context, but
1992 : : * the joinrel structure is there too, so no problem.
1993 : : */
1994 : 6729 : ppi = makeNode(ParamPathInfo);
1995 : 6729 : ppi->ppi_req_outer = required_outer;
1996 : 6729 : ppi->ppi_rows = rows;
1997 : 6729 : ppi->ppi_clauses = NIL;
1140 1998 : 6729 : ppi->ppi_serials = NULL;
5078 1999 : 6729 : joinrel->ppilist = lappend(joinrel->ppilist, ppi);
2000 : :
2001 : 6729 : return ppi;
2002 : : }
2003 : :
2004 : : /*
2005 : : * get_appendrel_parampathinfo
2006 : : * Get the ParamPathInfo for a parameterized path for an append relation.
2007 : : *
2008 : : * For an append relation, the rowcount estimate will just be the sum of
2009 : : * the estimates for its children. However, we still need a ParamPathInfo
2010 : : * to flag the fact that the path requires parameters. So this just creates
2011 : : * a suitable struct with zero ppi_rows (and no ppi_clauses either, since
2012 : : * the Append node isn't responsible for checking quals).
2013 : : */
2014 : : ParamPathInfo *
2015 : 26389 : get_appendrel_parampathinfo(RelOptInfo *appendrel, Relids required_outer)
2016 : : {
2017 : : ParamPathInfo *ppi;
2018 : :
2019 : : /* If rel has LATERAL refs, every path for it should account for them */
2593 2020 [ - + ]: 26389 : Assert(bms_is_subset(appendrel->lateral_relids, required_outer));
2021 : :
2022 : : /* Unparameterized paths have no ParamPathInfo */
5078 2023 [ + + ]: 26389 : if (bms_is_empty(required_outer))
2024 : 26105 : return NULL;
2025 : :
2026 [ - + ]: 284 : Assert(!bms_overlap(appendrel->relids, required_outer));
2027 : :
2028 : : /* If we already have a PPI for this parameterization, just return it */
3134 rhaas@postgresql.org 2029 [ + + ]: 284 : if ((ppi = find_param_path_info(appendrel, required_outer)))
2030 : 66 : return ppi;
2031 : :
2032 : : /* Else build the ParamPathInfo */
5078 tgl@sss.pgh.pa.us 2033 : 218 : ppi = makeNode(ParamPathInfo);
2034 : 218 : ppi->ppi_req_outer = required_outer;
2035 : 218 : ppi->ppi_rows = 0;
2036 : 218 : ppi->ppi_clauses = NIL;
1140 2037 : 218 : ppi->ppi_serials = NULL;
5078 2038 : 218 : appendrel->ppilist = lappend(appendrel->ppilist, ppi);
2039 : :
2040 : 218 : return ppi;
2041 : : }
2042 : :
2043 : : /*
2044 : : * Returns a ParamPathInfo for the parameterization given by required_outer, if
2045 : : * already available in the given rel. Returns NULL otherwise.
2046 : : */
2047 : : ParamPathInfo *
3134 rhaas@postgresql.org 2048 : 234153 : find_param_path_info(RelOptInfo *rel, Relids required_outer)
2049 : : {
2050 : : ListCell *lc;
2051 : :
2052 [ + + + + : 273658 : foreach(lc, rel->ppilist)
+ + ]
2053 : : {
2054 : 170138 : ParamPathInfo *ppi = (ParamPathInfo *) lfirst(lc);
2055 : :
2056 [ + + ]: 170138 : if (bms_equal(ppi->ppi_req_outer, required_outer))
2057 : 130633 : return ppi;
2058 : : }
2059 : :
2060 : 103520 : return NULL;
2061 : : }
2062 : :
2063 : : /*
2064 : : * get_param_path_clause_serials
2065 : : * Given a parameterized Path, return the set of pushed-down clauses
2066 : : * (identified by rinfo_serial numbers) enforced within the Path.
2067 : : */
2068 : : Bitmapset *
1140 tgl@sss.pgh.pa.us 2069 : 263091 : get_param_path_clause_serials(Path *path)
2070 : : {
2071 [ + + ]: 263091 : if (path->param_info == NULL)
2072 : 2011 : return NULL; /* not parameterized */
2073 : :
2074 : : /*
2075 : : * We don't currently support parameterized MergeAppend paths, as
2076 : : * explained in the comments for generate_orderedappend_paths.
2077 : : */
474 rguo@postgresql.org 2078 [ - + ]: 261080 : Assert(!IsA(path, MergeAppendPath));
2079 : :
1140 tgl@sss.pgh.pa.us 2080 [ + + ]: 261080 : if (IsA(path, NestPath) ||
2081 [ + + ]: 255501 : IsA(path, MergePath) ||
2082 [ + + ]: 255498 : IsA(path, HashPath))
2083 : : {
2084 : : /*
2085 : : * For a join path, combine clauses enforced within either input path
2086 : : * with those enforced as joinrestrictinfo in this path. Note that
2087 : : * joinrestrictinfo may include some non-pushed-down clauses, but for
2088 : : * current purposes it's okay if we include those in the result. (To
2089 : : * be more careful, we could check for clause_relids overlapping the
2090 : : * path parameterization, but it's not worth the cycles for now.)
2091 : : */
2092 : 6928 : JoinPath *jpath = (JoinPath *) path;
2093 : : Bitmapset *pserials;
2094 : : ListCell *lc;
2095 : :
2096 : 6928 : pserials = NULL;
2097 : 6928 : pserials = bms_add_members(pserials,
2098 : 6928 : get_param_path_clause_serials(jpath->outerjoinpath));
2099 : 6928 : pserials = bms_add_members(pserials,
2100 : 6928 : get_param_path_clause_serials(jpath->innerjoinpath));
2101 [ + + + + : 9771 : foreach(lc, jpath->joinrestrictinfo)
+ + ]
2102 : : {
2103 : 2843 : RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
2104 : :
2105 : 2843 : pserials = bms_add_member(pserials, rinfo->rinfo_serial);
2106 : : }
2107 : 6928 : return pserials;
2108 : : }
2109 [ + + ]: 254152 : else if (IsA(path, AppendPath))
2110 : : {
2111 : : /*
2112 : : * For an appendrel, take the intersection of the sets of clauses
2113 : : * enforced in each input path.
2114 : : */
2115 : 1269 : AppendPath *apath = (AppendPath *) path;
2116 : : Bitmapset *pserials;
2117 : : ListCell *lc;
2118 : :
2119 : 1269 : pserials = NULL;
2120 [ + + + + : 5233 : foreach(lc, apath->subpaths)
+ + ]
2121 : : {
2122 : 3964 : Path *subpath = (Path *) lfirst(lc);
2123 : : Bitmapset *subserials;
2124 : :
2125 : 3964 : subserials = get_param_path_clause_serials(subpath);
2126 [ + + ]: 3964 : if (lc == list_head(apath->subpaths))
2127 : 1257 : pserials = bms_copy(subserials);
2128 : : else
2129 : 2707 : pserials = bms_int_members(pserials, subserials);
2130 : : }
2131 : 1269 : return pserials;
2132 : : }
2133 : : else
2134 : : {
2135 : : /*
2136 : : * Otherwise, it's a baserel path and we can use the
2137 : : * previously-computed set of serial numbers.
2138 : : */
2139 : 252883 : return path->param_info->ppi_serials;
2140 : : }
2141 : : }
2142 : :
2143 : : /*
2144 : : * build_joinrel_partition_info
2145 : : * Checks if the two relations being joined can use partitionwise join
2146 : : * and if yes, initialize partitioning information of the resulting
2147 : : * partitioned join relation.
2148 : : */
2149 : : static void
2150 : 139163 : build_joinrel_partition_info(PlannerInfo *root,
2151 : : RelOptInfo *joinrel, RelOptInfo *outer_rel,
2152 : : RelOptInfo *inner_rel, SpecialJoinInfo *sjinfo,
2153 : : List *restrictlist)
2154 : : {
2155 : : PartitionScheme part_scheme;
2156 : :
2157 : : /* Nothing to do if partitionwise join technique is disabled. */
46 rhaas@postgresql.org 2158 [ + + ]:GNC 139163 : if ((joinrel->pgs_mask & PGS_CONSIDER_PARTITIONWISE) == 0)
2159 : : {
3082 rhaas@postgresql.org 2160 [ - + - - :CBC 127501 : Assert(!IS_PARTITIONED_REL(joinrel));
- - - - -
- ]
2161 : 127501 : return;
2162 : : }
2163 : :
2164 : : /*
2165 : : * We can only consider this join as an input to further partitionwise
2166 : : * joins if (a) the input relations are partitioned and have
2167 : : * consider_partitionwise_join=true, (b) the partition schemes match, and
2168 : : * (c) we can identify an equi-join between the partition keys. Note that
2169 : : * if it were possible for have_partkey_equi_join to return different
2170 : : * answers for the same joinrel depending on which join ordering we try
2171 : : * first, this logic would break. That shouldn't happen, though, because
2172 : : * of the way the query planner deduces implied equalities and reorders
2173 : : * the joins. Please see optimizer/README for details.
2174 : : */
2167 efujita@postgresql.o 2175 [ + + + + ]: 11662 : if (outer_rel->part_scheme == NULL || inner_rel->part_scheme == NULL ||
2753 2176 [ + + ]: 3854 : !outer_rel->consider_partitionwise_join ||
2177 [ + + ]: 3832 : !inner_rel->consider_partitionwise_join ||
3082 rhaas@postgresql.org 2178 [ + + ]: 3814 : outer_rel->part_scheme != inner_rel->part_scheme ||
1140 tgl@sss.pgh.pa.us 2179 [ + + ]: 3802 : !have_partkey_equi_join(root, joinrel, outer_rel, inner_rel,
2180 : : sjinfo->jointype, restrictlist))
2181 : : {
3082 rhaas@postgresql.org 2182 [ - + - - : 7944 : Assert(!IS_PARTITIONED_REL(joinrel));
- - - - -
- ]
2183 : 7944 : return;
2184 : : }
2185 : :
2186 : 3718 : part_scheme = outer_rel->part_scheme;
2187 : :
2188 : : /*
2189 : : * This function will be called only once for each joinrel, hence it
2190 : : * should not have partitioning fields filled yet.
2191 : : */
2192 [ + - + - : 3718 : Assert(!joinrel->part_scheme && !joinrel->partexprs &&
+ - + - -
+ ]
2193 : : !joinrel->nullable_partexprs && !joinrel->part_rels &&
2194 : : !joinrel->boundinfo);
2195 : :
2196 : : /*
2197 : : * If the join relation is partitioned, it uses the same partitioning
2198 : : * scheme as the joining relations.
2199 : : *
2200 : : * Note: we calculate the partition bounds, number of partitions, and
2201 : : * child-join relations of the join relation in try_partitionwise_join().
2202 : : */
2203 : 3718 : joinrel->part_scheme = part_scheme;
1140 tgl@sss.pgh.pa.us 2204 : 3718 : set_joinrel_partition_key_exprs(joinrel, outer_rel, inner_rel,
2205 : : sjinfo->jointype);
2206 : :
2207 : : /*
2208 : : * Set the consider_partitionwise_join flag.
2209 : : */
2753 efujita@postgresql.o 2210 [ - + ]: 3718 : Assert(outer_rel->consider_partitionwise_join);
2211 [ - + ]: 3718 : Assert(inner_rel->consider_partitionwise_join);
2212 : 3718 : joinrel->consider_partitionwise_join = true;
2213 : : }
2214 : :
2215 : : /*
2216 : : * have_partkey_equi_join
2217 : : *
2218 : : * Returns true if there exist equi-join conditions involving pairs
2219 : : * of matching partition keys of the relations being joined for all
2220 : : * partition keys.
2221 : : */
2222 : : static bool
1140 tgl@sss.pgh.pa.us 2223 : 3802 : have_partkey_equi_join(PlannerInfo *root, RelOptInfo *joinrel,
2224 : : RelOptInfo *rel1, RelOptInfo *rel2,
2225 : : JoinType jointype, List *restrictlist)
2226 : : {
2172 2227 : 3802 : PartitionScheme part_scheme = rel1->part_scheme;
2228 : : bool pk_known_equal[PARTITION_MAX_KEYS];
2229 : : int num_equal_pks;
2230 : : ListCell *lc;
2231 : :
2232 : : /*
2233 : : * This function must only be called when the joined relations have same
2234 : : * partitioning scheme.
2235 : : */
2236 [ - + ]: 3802 : Assert(rel1->part_scheme == rel2->part_scheme);
2237 [ - + ]: 3802 : Assert(part_scheme);
2238 : :
2239 : : /* We use a bool array to track which partkey columns are known equal */
593 rguo@postgresql.org 2240 : 3802 : memset(pk_known_equal, 0, sizeof(pk_known_equal));
2241 : : /* ... as well as a count of how many are known equal */
2242 : 3802 : num_equal_pks = 0;
2243 : :
2244 : : /* First, look through the join's restriction clauses */
2172 tgl@sss.pgh.pa.us 2245 [ + + + + : 4423 : foreach(lc, restrictlist)
+ + ]
2246 : : {
2247 : 4318 : RestrictInfo *rinfo = lfirst_node(RestrictInfo, lc);
2248 : : OpExpr *opexpr;
2249 : : Expr *expr1;
2250 : : Expr *expr2;
2251 : : bool strict_op;
2252 : : int ipk1;
2253 : : int ipk2;
2254 : :
2255 : : /* If processing an outer join, only use its own join clauses. */
2256 [ + + ]: 4318 : if (IS_OUTER_JOIN(jointype) &&
2257 [ + + - + ]: 841 : RINFO_IS_PUSHED_DOWN(rinfo, joinrel->relids))
2258 : 123 : continue;
2259 : :
2260 : : /* Skip clauses which can not be used for a join. */
2261 [ + + ]: 4195 : if (!rinfo->can_join)
2262 : 9 : continue;
2263 : :
2264 : : /* Skip clauses which are not equality conditions. */
2265 [ + + + - ]: 4186 : if (!rinfo->mergeopfamilies && !OidIsValid(rinfo->hashjoinoperator))
2266 : 3 : continue;
2267 : :
2268 : : /* Should be OK to assume it's an OpExpr. */
2269 : 4183 : opexpr = castNode(OpExpr, rinfo->clause);
2270 : :
2271 : : /* Match the operands to the relation. */
2272 [ + + + - ]: 7091 : if (bms_is_subset(rinfo->left_relids, rel1->relids) &&
2273 : 2908 : bms_is_subset(rinfo->right_relids, rel2->relids))
2274 : : {
2275 : 2908 : expr1 = linitial(opexpr->args);
2276 : 2908 : expr2 = lsecond(opexpr->args);
2277 : : }
2278 [ + - + - ]: 2550 : else if (bms_is_subset(rinfo->left_relids, rel2->relids) &&
2279 : 1275 : bms_is_subset(rinfo->right_relids, rel1->relids))
2280 : : {
2281 : 1275 : expr1 = lsecond(opexpr->args);
2282 : 1275 : expr2 = linitial(opexpr->args);
2283 : : }
2284 : : else
2172 tgl@sss.pgh.pa.us 2285 :UBC 0 : continue;
2286 : :
2287 : : /*
2288 : : * Now we need to know whether the join operator is strict; see
2289 : : * comments in pathnodes.h.
2290 : : */
2172 tgl@sss.pgh.pa.us 2291 :CBC 4183 : strict_op = op_strict(opexpr->opno);
2292 : :
2293 : : /*
2294 : : * Vars appearing in the relation's partition keys will not have any
2295 : : * varnullingrels, but those in expr1 and expr2 will if we're above
2296 : : * outer joins that could null the respective rels. It's okay to
2297 : : * match anyway, if the join operator is strict.
2298 : : */
1140 2299 [ + - ]: 4183 : if (strict_op)
2300 : : {
2301 [ + + ]: 4183 : if (bms_overlap(rel1->relids, root->outer_join_rels))
2302 : 96 : expr1 = (Expr *) remove_nulling_relids((Node *) expr1,
2303 : 96 : root->outer_join_rels,
2304 : : NULL);
2305 [ - + ]: 4183 : if (bms_overlap(rel2->relids, root->outer_join_rels))
1140 tgl@sss.pgh.pa.us 2306 :UBC 0 : expr2 = (Expr *) remove_nulling_relids((Node *) expr2,
2307 : 0 : root->outer_join_rels,
2308 : : NULL);
2309 : : }
2310 : :
2311 : : /*
2312 : : * Only clauses referencing the partition keys are useful for
2313 : : * partitionwise join.
2314 : : */
2172 tgl@sss.pgh.pa.us 2315 :CBC 4183 : ipk1 = match_expr_to_partition_keys(expr1, rel1, strict_op);
2316 [ + + ]: 4183 : if (ipk1 < 0)
2317 : 450 : continue;
2318 : 3733 : ipk2 = match_expr_to_partition_keys(expr2, rel2, strict_op);
2319 [ + + ]: 3733 : if (ipk2 < 0)
2320 : 24 : continue;
2321 : :
2322 : : /*
2323 : : * If the clause refers to keys at different ordinal positions, it can
2324 : : * not be used for partitionwise join.
2325 : : */
2326 [ + + ]: 3709 : if (ipk1 != ipk2)
2327 : 3 : continue;
2328 : :
2329 : : /* Ignore clause if we already proved these keys equal. */
593 rguo@postgresql.org 2330 [ - + ]: 3706 : if (pk_known_equal[ipk1])
593 rguo@postgresql.org 2331 :UBC 0 : continue;
2332 : :
2333 : : /* Reject if the partition key collation differs from the clause's. */
492 amitlan@postgresql.o 2334 [ + + ]:CBC 3706 : if (rel1->part_scheme->partcollation[ipk1] != opexpr->inputcollid)
2335 : 3697 : return false;
2336 : :
2337 : : /*
2338 : : * The clause allows partitionwise join only if it uses the same
2339 : : * operator family as that specified by the partition key.
2340 : : */
593 rguo@postgresql.org 2341 [ + + ]: 3700 : if (part_scheme->strategy == PARTITION_STRATEGY_HASH)
2342 : : {
2172 tgl@sss.pgh.pa.us 2343 [ + - ]: 36 : if (!OidIsValid(rinfo->hashjoinoperator) ||
2344 [ - + ]: 36 : !op_in_opfamily(rinfo->hashjoinoperator,
2345 : 36 : part_scheme->partopfamily[ipk1]))
2172 tgl@sss.pgh.pa.us 2346 :UBC 0 : continue;
2347 : : }
2172 tgl@sss.pgh.pa.us 2348 [ - + ]:CBC 3664 : else if (!list_member_oid(rinfo->mergeopfamilies,
2349 : 3664 : part_scheme->partopfamily[ipk1]))
2172 tgl@sss.pgh.pa.us 2350 :UBC 0 : continue;
2351 : :
2352 : : /* Mark the partition key as having an equi-join clause. */
593 rguo@postgresql.org 2353 :CBC 3700 : pk_known_equal[ipk1] = true;
2354 : :
2355 : : /* We can stop examining clauses once we prove all keys equal. */
2356 [ + + ]: 3700 : if (++num_equal_pks == part_scheme->partnatts)
2357 : 3691 : return true;
2358 : : }
2359 : :
2360 : : /*
2361 : : * Also check to see if any keys are known equal by equivclass.c. In most
2362 : : * cases there would have been a join restriction clause generated from
2363 : : * any EC that had such knowledge, but there might be no such clause, or
2364 : : * it might happen to constrain other members of the ECs than the ones we
2365 : : * are looking for.
2366 : : */
2367 [ + - ]: 108 : for (int ipk = 0; ipk < part_scheme->partnatts; ipk++)
2368 : : {
2369 : : Oid btree_opfamily;
2370 : :
2371 : : /* Ignore if we already proved these keys equal. */
2372 [ + + ]: 108 : if (pk_known_equal[ipk])
2373 : 3 : continue;
2374 : :
2375 : : /*
2376 : : * We need a btree opfamily to ask equivclass.c about. If the
2377 : : * partopfamily is a hash opfamily, look up its equality operator, and
2378 : : * select some btree opfamily that that operator is part of. (Any
2379 : : * such opfamily should be good enough, since equivclass.c will track
2380 : : * multiple opfamilies as appropriate.)
2381 : : */
2382 [ - + ]: 105 : if (part_scheme->strategy == PARTITION_STRATEGY_HASH)
2383 : : {
2384 : : Oid eq_op;
2385 : : List *eq_opfamilies;
2386 : :
593 rguo@postgresql.org 2387 :UBC 0 : eq_op = get_opfamily_member(part_scheme->partopfamily[ipk],
2388 : 0 : part_scheme->partopcintype[ipk],
2389 : 0 : part_scheme->partopcintype[ipk],
2390 : : HTEqualStrategyNumber);
2391 [ # # ]: 0 : if (!OidIsValid(eq_op))
2392 : 0 : break; /* we're not going to succeed */
2393 : 0 : eq_opfamilies = get_mergejoin_opfamilies(eq_op);
2394 [ # # ]: 0 : if (eq_opfamilies == NIL)
2395 : 0 : break; /* we're not going to succeed */
2396 : 0 : btree_opfamily = linitial_oid(eq_opfamilies);
2397 : : }
2398 : : else
593 rguo@postgresql.org 2399 :CBC 105 : btree_opfamily = part_scheme->partopfamily[ipk];
2400 : :
2401 : : /*
2402 : : * We consider only non-nullable partition keys here; nullable ones
2403 : : * would not be treated as part of the same equivalence classes as
2404 : : * non-nullable ones.
2405 : : */
2406 [ + - + + : 183 : foreach(lc, rel1->partexprs[ipk])
+ + ]
2407 : : {
2408 : 105 : Node *expr1 = (Node *) lfirst(lc);
2409 : : ListCell *lc2;
492 amitlan@postgresql.o 2410 : 105 : Oid partcoll1 = rel1->part_scheme->partcollation[ipk];
2411 : 105 : Oid exprcoll1 = exprCollation(expr1);
2412 : :
593 rguo@postgresql.org 2413 [ + - + + : 189 : foreach(lc2, rel2->partexprs[ipk])
+ + ]
2414 : : {
2415 : 111 : Node *expr2 = (Node *) lfirst(lc2);
2416 : :
2417 [ + + ]: 111 : if (exprs_known_equal(root, expr1, expr2, btree_opfamily))
2418 : : {
2419 : : /*
2420 : : * Ensure that the collation of the expression matches
2421 : : * that of the partition key. Checking just one collation
2422 : : * (partcoll1 and exprcoll1) suffices because partcoll1
2423 : : * and partcoll2, as well as exprcoll1 and exprcoll2,
2424 : : * should be identical. This holds because both rel1 and
2425 : : * rel2 use the same PartitionScheme and expr1 and expr2
2426 : : * are equal.
2427 : : */
492 amitlan@postgresql.o 2428 [ + + ]: 33 : if (partcoll1 == exprcoll1)
2429 : : {
2430 : 27 : Oid partcoll2 PG_USED_FOR_ASSERTS_ONLY =
2431 : 27 : rel2->part_scheme->partcollation[ipk];
2432 : : Oid exprcoll2 PG_USED_FOR_ASSERTS_ONLY =
2433 : 27 : exprCollation(expr2);
2434 : :
2435 [ - + ]: 27 : Assert(partcoll2 == exprcoll2);
2436 : 27 : pk_known_equal[ipk] = true;
2437 : 27 : break;
2438 : : }
2439 : : }
2440 : : }
593 rguo@postgresql.org 2441 [ + + ]: 105 : if (pk_known_equal[ipk])
2442 : 27 : break;
2443 : : }
2444 : :
2445 [ + + ]: 105 : if (pk_known_equal[ipk])
2446 : : {
2447 : : /* We can stop examining keys once we prove all keys equal. */
2448 [ + - ]: 27 : if (++num_equal_pks == part_scheme->partnatts)
2449 : 27 : return true;
2450 : : }
2451 : : else
2452 : 78 : break; /* no chance to succeed, give up */
2453 : : }
2454 : :
2455 : 78 : return false;
2456 : : }
2457 : :
2458 : : /*
2459 : : * match_expr_to_partition_keys
2460 : : *
2461 : : * Tries to match an expression to one of the nullable or non-nullable
2462 : : * partition keys of "rel". Returns the matched key's ordinal position,
2463 : : * or -1 if the expression could not be matched to any of the keys.
2464 : : *
2465 : : * strict_op must be true if the expression will be compared with the
2466 : : * partition key using a strict operator. This allows us to consider
2467 : : * nullable as well as nonnullable partition keys.
2468 : : */
2469 : : static int
2172 tgl@sss.pgh.pa.us 2470 : 7916 : match_expr_to_partition_keys(Expr *expr, RelOptInfo *rel, bool strict_op)
2471 : : {
2472 : : int cnt;
2473 : :
2474 : : /* This function should be called only for partitioned relations. */
2475 [ - + ]: 7916 : Assert(rel->part_scheme);
2476 [ - + ]: 7916 : Assert(rel->partexprs);
2477 [ - + ]: 7916 : Assert(rel->nullable_partexprs);
2478 : :
2479 : : /* Remove any relabel decorations. */
2480 [ + + ]: 8060 : while (IsA(expr, RelabelType))
2481 : 144 : expr = (Expr *) (castNode(RelabelType, expr))->arg;
2482 : :
2483 [ + + ]: 8408 : for (cnt = 0; cnt < rel->part_scheme->partnatts; cnt++)
2484 : : {
2485 : : ListCell *lc;
2486 : :
2487 : : /* We can always match to the non-nullable partition keys. */
2488 [ + + + + : 8444 : foreach(lc, rel->partexprs[cnt])
+ + ]
2489 : : {
2490 [ + + ]: 7910 : if (equal(lfirst(lc), expr))
2491 : 7400 : return cnt;
2492 : : }
2493 : :
2494 [ - + ]: 534 : if (!strict_op)
2172 tgl@sss.pgh.pa.us 2495 :UBC 0 : continue;
2496 : :
2497 : : /*
2498 : : * If it's a strict join operator then a NULL partition key on one
2499 : : * side will not join to any partition key on the other side, and in
2500 : : * particular such a row can't join to a row from a different
2501 : : * partition on the other side. So, it's okay to search the nullable
2502 : : * partition keys as well.
2503 : : */
2172 tgl@sss.pgh.pa.us 2504 [ + + + + :CBC 612 : foreach(lc, rel->nullable_partexprs[cnt])
+ + ]
2505 : : {
2506 [ + + ]: 120 : if (equal(lfirst(lc), expr))
2507 : 42 : return cnt;
2508 : : }
2509 : : }
2510 : :
2511 : 474 : return -1;
2512 : : }
2513 : :
2514 : : /*
2515 : : * set_joinrel_partition_key_exprs
2516 : : * Initialize partition key expressions for a partitioned joinrel.
2517 : : */
2518 : : static void
2519 : 3718 : set_joinrel_partition_key_exprs(RelOptInfo *joinrel,
2520 : : RelOptInfo *outer_rel, RelOptInfo *inner_rel,
2521 : : JoinType jointype)
2522 : : {
2168 2523 : 3718 : PartitionScheme part_scheme = joinrel->part_scheme;
2524 : 3718 : int partnatts = part_scheme->partnatts;
2525 : :
95 michael@paquier.xyz 2526 :GNC 3718 : joinrel->partexprs = palloc0_array(List *, partnatts);
2527 : 3718 : joinrel->nullable_partexprs = palloc0_array(List *, partnatts);
2528 : :
2529 : : /*
2530 : : * The joinrel's partition expressions are the same as those of the input
2531 : : * rels, but we must properly classify them as nullable or not in the
2532 : : * joinrel's output. (Also, we add some more partition expressions if
2533 : : * it's a FULL JOIN.)
2534 : : */
2172 tgl@sss.pgh.pa.us 2535 [ + + ]:CBC 7442 : for (int cnt = 0; cnt < partnatts; cnt++)
2536 : : {
2537 : : /* mark these const to enforce that we copy them properly */
2407 2538 : 3724 : const List *outer_expr = outer_rel->partexprs[cnt];
2539 : 3724 : const List *outer_null_expr = outer_rel->nullable_partexprs[cnt];
2540 : 3724 : const List *inner_expr = inner_rel->partexprs[cnt];
2541 : 3724 : const List *inner_null_expr = inner_rel->nullable_partexprs[cnt];
3082 rhaas@postgresql.org 2542 : 3724 : List *partexpr = NIL;
2543 : 3724 : List *nullable_partexpr = NIL;
2544 : : ListCell *lc;
2545 : :
2546 [ + + + + : 3724 : switch (jointype)
- ]
2547 : : {
2548 : : /*
2549 : : * A join relation resulting from an INNER join may be
2550 : : * regarded as partitioned by either of the inner and outer
2551 : : * relation keys. For example, A INNER JOIN B ON A.a = B.b
2552 : : * can be regarded as partitioned on either A.a or B.b. So we
2553 : : * add both keys to the joinrel's partexpr lists. However,
2554 : : * anything that was already nullable still has to be treated
2555 : : * as nullable.
2556 : : */
2557 : 3135 : case JOIN_INNER:
2407 tgl@sss.pgh.pa.us 2558 : 3135 : partexpr = list_concat_copy(outer_expr, inner_expr);
2559 : 3135 : nullable_partexpr = list_concat_copy(outer_null_expr,
2560 : : inner_null_expr);
3082 rhaas@postgresql.org 2561 : 3135 : break;
2562 : :
2563 : : /*
2564 : : * A join relation resulting from a SEMI or ANTI join may be
2565 : : * regarded as partitioned by the outer relation keys. The
2566 : : * inner relation's keys are no longer interesting; since they
2567 : : * aren't visible in the join output, nothing could join to
2568 : : * them.
2569 : : */
2570 : 156 : case JOIN_SEMI:
2571 : : case JOIN_ANTI:
2407 tgl@sss.pgh.pa.us 2572 : 156 : partexpr = list_copy(outer_expr);
2573 : 156 : nullable_partexpr = list_copy(outer_null_expr);
3082 rhaas@postgresql.org 2574 : 156 : break;
2575 : :
2576 : : /*
2577 : : * A join relation resulting from a LEFT OUTER JOIN likewise
2578 : : * may be regarded as partitioned on the (non-nullable) outer
2579 : : * relation keys. The inner (nullable) relation keys are okay
2580 : : * as partition keys for further joins as long as they involve
2581 : : * strict join operators.
2582 : : */
2583 : 290 : case JOIN_LEFT:
2407 tgl@sss.pgh.pa.us 2584 : 290 : partexpr = list_copy(outer_expr);
2585 : 290 : nullable_partexpr = list_concat_copy(inner_expr,
2586 : : outer_null_expr);
3082 rhaas@postgresql.org 2587 : 290 : nullable_partexpr = list_concat(nullable_partexpr,
2588 : : inner_null_expr);
2589 : 290 : break;
2590 : :
2591 : : /*
2592 : : * For FULL OUTER JOINs, both relations are nullable, so the
2593 : : * resulting join relation may be regarded as partitioned on
2594 : : * either of inner and outer relation keys, but only for joins
2595 : : * that involve strict join operators.
2596 : : */
2597 : 143 : case JOIN_FULL:
2407 tgl@sss.pgh.pa.us 2598 : 143 : nullable_partexpr = list_concat_copy(outer_expr,
2599 : : inner_expr);
3082 rhaas@postgresql.org 2600 : 143 : nullable_partexpr = list_concat(nullable_partexpr,
2601 : : outer_null_expr);
2602 : 143 : nullable_partexpr = list_concat(nullable_partexpr,
2603 : : inner_null_expr);
2604 : :
2605 : : /*
2606 : : * Also add CoalesceExprs corresponding to each possible
2607 : : * full-join output variable (that is, left side coalesced to
2608 : : * right side), so that we can match equijoin expressions
2609 : : * using those variables. We really only need these for
2610 : : * columns merged by JOIN USING, and only with the pairs of
2611 : : * input items that correspond to the data structures that
2612 : : * parse analysis would build for such variables. But it's
2613 : : * hard to tell which those are, so just make all the pairs.
2614 : : * Extra items in the nullable_partexprs list won't cause big
2615 : : * problems. (It's possible that such items will get matched
2616 : : * to user-written COALESCEs, but it should still be valid to
2617 : : * partition on those, since they're going to be either the
2618 : : * partition column or NULL; it's the same argument as for
2619 : : * partitionwise nesting of any outer join.) We assume no
2620 : : * type coercions are needed to make the coalesce expressions,
2621 : : * since columns of different types won't have gotten
2622 : : * classified as the same PartitionScheme. Note that we
2623 : : * intentionally leave out the varnullingrels decoration that
2624 : : * would ordinarily appear on the Vars inside these
2625 : : * CoalesceExprs, because have_partkey_equi_join will strip
2626 : : * varnullingrels from the expressions it will compare to the
2627 : : * partexprs.
2628 : : */
2168 tgl@sss.pgh.pa.us 2629 [ + - + + : 364 : foreach(lc, list_concat_copy(outer_expr, outer_null_expr))
+ + ]
2630 : : {
2631 : 221 : Node *larg = (Node *) lfirst(lc);
2632 : : ListCell *lc2;
2633 : :
2634 [ + - + + : 442 : foreach(lc2, list_concat_copy(inner_expr, inner_null_expr))
+ + ]
2635 : : {
2636 : 221 : Node *rarg = (Node *) lfirst(lc2);
2637 : 221 : CoalesceExpr *c = makeNode(CoalesceExpr);
2638 : :
2639 : 221 : c->coalescetype = exprType(larg);
2640 : 221 : c->coalescecollid = exprCollation(larg);
2641 : 221 : c->args = list_make2(larg, rarg);
2642 : 221 : c->location = -1;
2643 : 221 : nullable_partexpr = lappend(nullable_partexpr, c);
2644 : : }
2645 : : }
3082 rhaas@postgresql.org 2646 : 143 : break;
2647 : :
3082 rhaas@postgresql.org 2648 :UBC 0 : default:
2649 [ # # ]: 0 : elog(ERROR, "unrecognized join type: %d", (int) jointype);
2650 : : }
2651 : :
3082 rhaas@postgresql.org 2652 :CBC 3724 : joinrel->partexprs[cnt] = partexpr;
2653 : 3724 : joinrel->nullable_partexprs[cnt] = nullable_partexpr;
2654 : : }
2655 : 3718 : }
2656 : :
2657 : : /*
2658 : : * build_child_join_reltarget
2659 : : * Set up a child-join relation's reltarget from a parent-join relation.
2660 : : */
2661 : : static void
2753 efujita@postgresql.o 2662 : 9257 : build_child_join_reltarget(PlannerInfo *root,
2663 : : RelOptInfo *parentrel,
2664 : : RelOptInfo *childrel,
2665 : : int nappinfos,
2666 : : AppendRelInfo **appinfos)
2667 : : {
2668 : : /* Build the targetlist */
2669 : 18514 : childrel->reltarget->exprs = (List *)
2670 : 9257 : adjust_appendrel_attrs(root,
2671 : 9257 : (Node *) parentrel->reltarget->exprs,
2672 : : nappinfos, appinfos);
2673 : :
2674 : : /* Set the cost and width fields */
2675 : 9257 : childrel->reltarget->cost.startup = parentrel->reltarget->cost.startup;
2676 : 9257 : childrel->reltarget->cost.per_tuple = parentrel->reltarget->cost.per_tuple;
2677 : 9257 : childrel->reltarget->width = parentrel->reltarget->width;
2678 : 9257 : }
2679 : :
2680 : : /*
2681 : : * create_rel_agg_info
2682 : : * Create the RelAggInfo structure for the given relation if it can produce
2683 : : * grouped paths. The given relation is the non-grouped one which has the
2684 : : * reltarget already constructed.
2685 : : *
2686 : : * calculate_grouped_rows: if true, calculate the estimated number of grouped
2687 : : * rows for the relation. If false, skip the estimation to avoid unnecessary
2688 : : * planning overhead.
2689 : : */
2690 : : RelAggInfo *
158 rguo@postgresql.org 2691 :GNC 10518 : create_rel_agg_info(PlannerInfo *root, RelOptInfo *rel,
2692 : : bool calculate_grouped_rows)
2693 : : {
2694 : : ListCell *lc;
2695 : : RelAggInfo *result;
2696 : : PathTarget *agg_input;
2697 : : PathTarget *target;
2698 : 10518 : List *group_clauses = NIL;
2699 : 10518 : List *group_exprs = NIL;
2700 : :
2701 : : /*
2702 : : * The lists of aggregate expressions and grouping expressions should have
2703 : : * been constructed.
2704 : : */
2705 [ - + ]: 10518 : Assert(root->agg_clause_list != NIL);
2706 [ - + ]: 10518 : Assert(root->group_expr_list != NIL);
2707 : :
2708 : : /*
2709 : : * If this is a child rel, the grouped rel for its parent rel must have
2710 : : * been created if it can. So we can just use parent's RelAggInfo if
2711 : : * there is one, with appropriate variable substitutions.
2712 : : */
2713 [ + + + + : 10518 : if (IS_OTHER_REL(rel))
- + ]
2714 : : {
2715 : : RelOptInfo *grouped_rel;
2716 : : RelAggInfo *agg_info;
2717 : :
2718 : 7566 : grouped_rel = rel->top_parent->grouped_rel;
2719 [ + + ]: 7566 : if (grouped_rel == NULL)
2720 : 906 : return NULL;
2721 : :
2722 [ - + ]: 6660 : Assert(IS_GROUPED_REL(grouped_rel));
2723 : :
2724 : : /* Must do multi-level transformation */
2725 : : agg_info = (RelAggInfo *)
2726 : 6660 : adjust_appendrel_attrs_multilevel(root,
2727 : 6660 : (Node *) grouped_rel->agg_info,
2728 : : rel,
2729 : 6660 : rel->top_parent);
2730 : :
152 2731 : 6660 : agg_info->apply_agg_at = NULL; /* caller will change this later */
2732 : :
158 2733 [ + + ]: 6660 : if (calculate_grouped_rows)
2734 : : {
2735 : 462 : agg_info->grouped_rows =
2736 : 462 : estimate_num_groups(root, agg_info->group_exprs,
2737 : : rel->rows, NULL, NULL);
2738 : :
2739 : : /*
2740 : : * The grouped paths for the given relation are considered useful
2741 : : * iff the average group size is no less than
2742 : : * min_eager_agg_group_size.
2743 : : */
2744 : 462 : agg_info->agg_useful =
2745 : 462 : (rel->rows / agg_info->grouped_rows) >= min_eager_agg_group_size;
2746 : : }
2747 : :
2748 : 6660 : return agg_info;
2749 : : }
2750 : :
2751 : : /* Check if it's possible to produce grouped paths for this relation. */
2752 [ + + ]: 2952 : if (!eager_aggregation_possible_for_relation(root, rel))
2753 : 540 : return NULL;
2754 : :
2755 : : /*
2756 : : * Create targets for the grouped paths and for the input paths of the
2757 : : * grouped paths.
2758 : : */
2759 : 2412 : target = create_empty_pathtarget();
2760 : 2412 : agg_input = create_empty_pathtarget();
2761 : :
2762 : : /* ... and initialize these targets */
2763 [ + + ]: 2412 : if (!init_grouping_targets(root, rel, target, agg_input,
2764 : : &group_clauses, &group_exprs))
2765 : 75 : return NULL;
2766 : :
2767 : : /*
2768 : : * Eager aggregation is not applicable if there are no available grouping
2769 : : * expressions.
2770 : : */
2771 [ + + ]: 2337 : if (group_clauses == NIL)
2772 : 9 : return NULL;
2773 : :
2774 : : /* Add aggregates to the grouping target */
2775 [ + - + + : 5994 : foreach(lc, root->agg_clause_list)
+ + ]
2776 : : {
2777 : 3666 : AggClauseInfo *ac_info = lfirst_node(AggClauseInfo, lc);
2778 : : Aggref *aggref;
2779 : :
2780 [ - + ]: 3666 : Assert(IsA(ac_info->aggref, Aggref));
2781 : :
2782 : 3666 : aggref = (Aggref *) copyObject(ac_info->aggref);
2783 : 3666 : mark_partial_aggref(aggref, AGGSPLIT_INITIAL_SERIAL);
2784 : :
2785 : 3666 : add_column_to_pathtarget(target, (Expr *) aggref, 0);
2786 : : }
2787 : :
2788 : : /* Set the estimated eval cost and output width for both targets */
2789 : 2328 : set_pathtarget_cost_width(root, target);
2790 : 2328 : set_pathtarget_cost_width(root, agg_input);
2791 : :
2792 : : /* build the RelAggInfo result */
2793 : 2328 : result = makeNode(RelAggInfo);
2794 : 2328 : result->target = target;
2795 : 2328 : result->agg_input = agg_input;
2796 : 2328 : result->group_clauses = group_clauses;
2797 : 2328 : result->group_exprs = group_exprs;
152 2798 : 2328 : result->apply_agg_at = NULL; /* caller will change this later */
2799 : :
158 2800 [ + + ]: 2328 : if (calculate_grouped_rows)
2801 : : {
2802 : 421 : result->grouped_rows = estimate_num_groups(root, result->group_exprs,
2803 : : rel->rows, NULL, NULL);
2804 : :
2805 : : /*
2806 : : * The grouped paths for the given relation are considered useful iff
2807 : : * the average group size is no less than min_eager_agg_group_size.
2808 : : */
2809 : 421 : result->agg_useful =
2810 : 421 : (rel->rows / result->grouped_rows) >= min_eager_agg_group_size;
2811 : : }
2812 : :
2813 : 2328 : return result;
2814 : : }
2815 : :
2816 : : /*
2817 : : * eager_aggregation_possible_for_relation
2818 : : * Check if it's possible to produce grouped paths for the given relation.
2819 : : */
2820 : : static bool
2821 : 2952 : eager_aggregation_possible_for_relation(PlannerInfo *root, RelOptInfo *rel)
2822 : : {
2823 : : ListCell *lc;
2824 : : int cur_relid;
2825 : :
2826 : : /*
2827 : : * Check to see if the given relation is in the nullable side of an outer
2828 : : * join. In this case, we cannot push a partial aggregation down to the
2829 : : * relation, because the NULL-extended rows produced by the outer join
2830 : : * would not be available when we perform the partial aggregation, while
2831 : : * with a non-eager-aggregation plan these rows are available for the
2832 : : * top-level aggregation. Doing so may result in the rows being grouped
2833 : : * differently than expected, or produce incorrect values from the
2834 : : * aggregate functions.
2835 : : */
2836 : 2952 : cur_relid = -1;
2837 [ + + ]: 8414 : while ((cur_relid = bms_next_member(rel->relids, cur_relid)) >= 0)
2838 : : {
2839 : 5561 : RelOptInfo *baserel = find_base_rel_ignore_join(root, cur_relid);
2840 : :
2841 [ + + ]: 5561 : if (baserel == NULL)
2842 : 207 : continue; /* ignore outer joins in rel->relids */
2843 : :
2844 [ + + ]: 5354 : if (!bms_is_subset(baserel->nulling_relids, rel->relids))
2845 : 99 : return false;
2846 : : }
2847 : :
2848 : : /*
2849 : : * For now we don't try to support PlaceHolderVars.
2850 : : */
2851 [ + - + + : 8805 : foreach(lc, rel->reltarget->exprs)
+ + ]
2852 : : {
2853 : 5958 : Expr *expr = lfirst(lc);
2854 : :
2855 [ + + ]: 5958 : if (IsA(expr, PlaceHolderVar))
2856 : 6 : return false;
2857 : : }
2858 : :
2859 : : /* Caller should only pass base relations or joins. */
2860 [ + + - + ]: 2847 : Assert(rel->reloptkind == RELOPT_BASEREL ||
2861 : : rel->reloptkind == RELOPT_JOINREL);
2862 : :
2863 : : /*
2864 : : * Check if all aggregate expressions can be evaluated on this relation
2865 : : * level.
2866 : : */
2867 [ + - + + : 6624 : foreach(lc, root->agg_clause_list)
+ + ]
2868 : : {
2869 : 4212 : AggClauseInfo *ac_info = lfirst_node(AggClauseInfo, lc);
2870 : :
2871 [ - + ]: 4212 : Assert(IsA(ac_info->aggref, Aggref));
2872 : :
2873 : : /*
2874 : : * Give up if any aggregate requires relations other than the current
2875 : : * one. If the aggregate requires the current relation plus
2876 : : * additional relations, grouping the current relation could make some
2877 : : * input rows unavailable for the higher aggregate and may reduce the
2878 : : * number of input rows it receives. If the aggregate does not
2879 : : * require the current relation at all, it should not be grouped, as
2880 : : * we do not support joining two grouped relations.
2881 : : */
2882 [ + + ]: 4212 : if (!bms_is_subset(ac_info->agg_eval_at, rel->relids))
2883 : 435 : return false;
2884 : : }
2885 : :
2886 : 2412 : return true;
2887 : : }
2888 : :
2889 : : /*
2890 : : * init_grouping_targets
2891 : : * Initialize the target for grouped paths (target) as well as the target
2892 : : * for paths that generate input for the grouped paths (agg_input).
2893 : : *
2894 : : * We also construct the list of SortGroupClauses and the list of grouping
2895 : : * expressions for the partial aggregation, and return them in *group_clause
2896 : : * and *group_exprs.
2897 : : *
2898 : : * Return true if the targets could be initialized, false otherwise.
2899 : : */
2900 : : static bool
2901 : 2412 : init_grouping_targets(PlannerInfo *root, RelOptInfo *rel,
2902 : : PathTarget *target, PathTarget *agg_input,
2903 : : List **group_clauses, List **group_exprs)
2904 : : {
2905 : : ListCell *lc;
2906 : 2412 : List *possibly_dependent = NIL;
2907 : : Index maxSortGroupRef;
2908 : :
2909 : : /* Identify the max sortgroupref */
2910 : 2412 : maxSortGroupRef = 0;
2911 [ + - + + : 11353 : foreach(lc, root->processed_tlist)
+ + ]
2912 : : {
2913 : 8941 : Index ref = ((TargetEntry *) lfirst(lc))->ressortgroupref;
2914 : :
2915 [ + + ]: 8941 : if (ref > maxSortGroupRef)
2916 : 2638 : maxSortGroupRef = ref;
2917 : : }
2918 : :
2919 : : /*
2920 : : * At this point, all Vars from this relation that are needed by upper
2921 : : * joins or are required in the final targetlist should already be present
2922 : : * in its reltarget. Therefore, we can safely iterate over this
2923 : : * relation's reltarget->exprs to construct the PathTarget and grouping
2924 : : * clauses for the grouped paths.
2925 : : */
2926 [ + - + + : 7460 : foreach(lc, rel->reltarget->exprs)
+ + ]
2927 : : {
2928 : 5051 : Expr *expr = (Expr *) lfirst(lc);
2929 : : Index sortgroupref;
2930 : :
2931 : : /*
2932 : : * Given that PlaceHolderVar currently prevents us from doing eager
2933 : : * aggregation, the source target cannot contain anything more complex
2934 : : * than a Var.
2935 : : */
2936 [ - + ]: 5051 : Assert(IsA(expr, Var));
2937 : :
2938 : : /*
2939 : : * Get the sortgroupref of the expr if it is found among, or can be
2940 : : * deduced from, the original grouping expressions.
2941 : : */
2942 : 5051 : sortgroupref = get_expression_sortgroupref(root, expr);
2943 [ + + ]: 5051 : if (sortgroupref > 0)
2944 : : {
2945 : : SortGroupClause *sgc;
2946 : :
2947 : : /* Find the matching SortGroupClause */
2948 : 2366 : sgc = get_sortgroupref_clause(sortgroupref, root->processed_groupClause);
2949 [ - + ]: 2366 : Assert(sgc->tleSortGroupRef <= maxSortGroupRef);
2950 : :
2951 : : /*
2952 : : * If the target expression is to be used as a grouping key, it
2953 : : * should be emitted by the grouped paths that have been pushed
2954 : : * down to this relation level.
2955 : : */
2956 : 2366 : add_column_to_pathtarget(target, expr, sortgroupref);
2957 : :
2958 : : /*
2959 : : * ... and it also should be emitted by the input paths.
2960 : : */
2961 : 2366 : add_column_to_pathtarget(agg_input, expr, sortgroupref);
2962 : :
2963 : : /*
2964 : : * Record this SortGroupClause and grouping expression. Note that
2965 : : * this SortGroupClause might have already been recorded.
2966 : : */
2967 [ + + ]: 2366 : if (!list_member(*group_clauses, sgc))
2968 : : {
2969 : 2300 : *group_clauses = lappend(*group_clauses, sgc);
2970 : 2300 : *group_exprs = lappend(*group_exprs, expr);
2971 : : }
2972 : : }
2973 [ + + ]: 2685 : else if (is_var_needed_by_join(root, (Var *) expr, rel))
2974 : : {
2975 : : /*
2976 : : * The expression is needed for an upper join but is neither in
2977 : : * the GROUP BY clause nor derivable from it using EC (otherwise,
2978 : : * it would have already been included in the targets above). We
2979 : : * need to create a special SortGroupClause for this expression.
2980 : : *
2981 : : * It is important to include such expressions in the grouping
2982 : : * keys. This is essential to ensure that an aggregated row from
2983 : : * the partial aggregation matches the other side of the join if
2984 : : * and only if each row in the partial group does. This ensures
2985 : : * that all rows within the same partial group share the same
2986 : : * 'destiny', which is crucial for maintaining correctness.
2987 : : */
2988 : : SortGroupClause *sgc;
2989 : : TypeCacheEntry *tce;
2990 : : Oid equalimageproc;
2991 : :
2992 : : /*
2993 : : * But first, check if equality implies image equality for this
2994 : : * expression. If not, we cannot use it as a grouping key. See
2995 : : * comments in create_grouping_expr_infos().
2996 : : */
2997 : 193 : tce = lookup_type_cache(exprType((Node *) expr),
2998 : : TYPECACHE_BTREE_OPFAMILY);
2999 [ + - ]: 193 : if (!OidIsValid(tce->btree_opf) ||
3000 [ - + ]: 193 : !OidIsValid(tce->btree_opintype))
3001 : 3 : return false;
3002 : :
3003 : 193 : equalimageproc = get_opfamily_proc(tce->btree_opf,
3004 : : tce->btree_opintype,
3005 : : tce->btree_opintype,
3006 : : BTEQUALIMAGE_PROC);
3007 [ + + ]: 193 : if (!OidIsValid(equalimageproc) ||
3008 [ - + ]: 190 : !DatumGetBool(OidFunctionCall1Coll(equalimageproc,
3009 : : tce->typcollation,
3010 : : ObjectIdGetDatum(tce->btree_opintype))))
3011 : 3 : return false;
3012 : :
3013 : : /* Create the SortGroupClause. */
3014 : 190 : sgc = makeNode(SortGroupClause);
3015 : :
3016 : : /* Initialize the SortGroupClause. */
3017 : 190 : sgc->tleSortGroupRef = ++maxSortGroupRef;
3018 : 190 : get_sort_group_operators(exprType((Node *) expr),
3019 : : false, true, false,
3020 : : &sgc->sortop, &sgc->eqop, NULL,
3021 : : &sgc->hashable);
3022 : :
3023 : : /* This expression should be emitted by the grouped paths */
3024 : 190 : add_column_to_pathtarget(target, expr, sgc->tleSortGroupRef);
3025 : :
3026 : : /* ... and it also should be emitted by the input paths. */
3027 : 190 : add_column_to_pathtarget(agg_input, expr, sgc->tleSortGroupRef);
3028 : :
3029 : : /* Record this SortGroupClause and grouping expression */
3030 : 190 : *group_clauses = lappend(*group_clauses, sgc);
3031 : 190 : *group_exprs = lappend(*group_exprs, expr);
3032 : : }
3033 [ + + ]: 2492 : else if (is_var_in_aggref_only(root, (Var *) expr))
3034 : : {
3035 : : /*
3036 : : * The expression is referenced by an aggregate function pushed
3037 : : * down to this relation and does not appear elsewhere in the
3038 : : * targetlist or havingQual. Add it to 'agg_input' but not to
3039 : : * 'target'.
3040 : : */
3041 : 2324 : add_new_column_to_pathtarget(agg_input, expr);
3042 : : }
3043 : : else
3044 : : {
3045 : : /*
3046 : : * The expression may be functionally dependent on other
3047 : : * expressions in the target, but we cannot verify this until all
3048 : : * target expressions have been constructed.
3049 : : */
3050 : 168 : possibly_dependent = lappend(possibly_dependent, expr);
3051 : : }
3052 : : }
3053 : :
3054 : : /*
3055 : : * Now we can verify whether an expression is functionally dependent on
3056 : : * others.
3057 : : */
3058 [ + + + + : 2433 : foreach(lc, possibly_dependent)
+ + ]
3059 : : {
3060 : : Var *tvar;
3061 : 96 : List *deps = NIL;
3062 : : RangeTblEntry *rte;
3063 : :
3064 : 96 : tvar = lfirst_node(Var, lc);
3065 : 96 : rte = root->simple_rte_array[tvar->varno];
3066 : :
3067 [ + + ]: 96 : if (check_functional_grouping(rte->relid, tvar->varno,
3068 : : tvar->varlevelsup,
3069 : : target->exprs, &deps))
3070 : : {
3071 : : /*
3072 : : * The expression is functionally dependent on other target
3073 : : * expressions, so it can be included in the targets. Since it
3074 : : * will not be used as a grouping key, a sortgroupref is not
3075 : : * needed for it.
3076 : : */
3077 : 24 : add_new_column_to_pathtarget(target, (Expr *) tvar);
3078 : 24 : add_new_column_to_pathtarget(agg_input, (Expr *) tvar);
3079 : : }
3080 : : else
3081 : : {
3082 : : /*
3083 : : * We may arrive here with a grouping expression that is proven
3084 : : * redundant by EquivalenceClass processing, such as 't1.a' in the
3085 : : * query below.
3086 : : *
3087 : : * select max(t1.c) from t t1, t t2 where t1.a = 1 group by t1.a,
3088 : : * t1.b;
3089 : : *
3090 : : * For now we just give up in this case.
3091 : : */
3092 : 72 : return false;
3093 : : }
3094 : : }
3095 : :
3096 : 2337 : return true;
3097 : : }
3098 : :
3099 : : /*
3100 : : * is_var_in_aggref_only
3101 : : * Check whether the given Var appears in aggregate expressions and not
3102 : : * elsewhere in the targetlist or havingQual.
3103 : : */
3104 : : static bool
3105 : 2492 : is_var_in_aggref_only(PlannerInfo *root, Var *var)
3106 : : {
3107 : : ListCell *lc;
3108 : :
3109 : : /*
3110 : : * Search the list of aggregate expressions for the Var.
3111 : : */
3112 [ + - + + : 2732 : foreach(lc, root->agg_clause_list)
+ + ]
3113 : : {
3114 : 2564 : AggClauseInfo *ac_info = lfirst_node(AggClauseInfo, lc);
3115 : : List *vars;
3116 : :
3117 [ - + ]: 2564 : Assert(IsA(ac_info->aggref, Aggref));
3118 : :
3119 [ + + ]: 2564 : if (!bms_is_member(var->varno, ac_info->agg_eval_at))
3120 : 240 : continue;
3121 : :
3122 : 2324 : vars = pull_var_clause((Node *) ac_info->aggref,
3123 : : PVC_RECURSE_AGGREGATES |
3124 : : PVC_RECURSE_WINDOWFUNCS |
3125 : : PVC_RECURSE_PLACEHOLDERS);
3126 : :
3127 [ + - ]: 2324 : if (list_member(vars, var))
3128 : : {
3129 : 2324 : list_free(vars);
3130 : 2324 : break;
3131 : : }
3132 : :
158 rguo@postgresql.org 3133 :UNC 0 : list_free(vars);
3134 : : }
3135 : :
158 rguo@postgresql.org 3136 [ + + + - ]:GNC 2492 : return (lc != NULL && !list_member(root->tlist_vars, var));
3137 : : }
3138 : :
3139 : : /*
3140 : : * is_var_needed_by_join
3141 : : * Check if the given Var is needed by joins above the current rel.
3142 : : */
3143 : : static bool
3144 : 2685 : is_var_needed_by_join(PlannerInfo *root, Var *var, RelOptInfo *rel)
3145 : : {
3146 : : Relids relids;
3147 : : int attno;
3148 : : RelOptInfo *baserel;
3149 : :
3150 : : /*
3151 : : * Note that when checking if the Var is needed by joins above, we want to
3152 : : * exclude cases where the Var is only needed in the final targetlist. So
3153 : : * include "relation 0" in the check.
3154 : : */
3155 : 2685 : relids = bms_copy(rel->relids);
3156 : 2685 : relids = bms_add_member(relids, 0);
3157 : :
3158 : 2685 : baserel = find_base_rel(root, var->varno);
3159 : 2685 : attno = var->varattno - baserel->min_attr;
3160 : :
3161 : 2685 : return bms_nonempty_difference(baserel->attr_needed[attno], relids);
3162 : : }
3163 : :
3164 : : /*
3165 : : * get_expression_sortgroupref
3166 : : * Return the sortgroupref of the given "expr" if it is found among the
3167 : : * original grouping expressions, or is known equal to any of the original
3168 : : * grouping expressions due to equivalence relationships. Return 0 if no
3169 : : * match is found.
3170 : : */
3171 : : static Index
3172 : 5051 : get_expression_sortgroupref(PlannerInfo *root, Expr *expr)
3173 : : {
3174 : : ListCell *lc;
3175 : :
3176 [ - + ]: 5051 : Assert(IsA(expr, Var));
3177 : :
3178 [ + - + + : 7830 : foreach(lc, root->group_expr_list)
+ + ]
3179 : : {
3180 : 5145 : GroupingExprInfo *ge_info = lfirst_node(GroupingExprInfo, lc);
3181 : : ListCell *lc1;
3182 : :
3183 [ - + ]: 5145 : Assert(IsA(ge_info->expr, Var));
3184 [ - + ]: 5145 : Assert(ge_info->sortgroupref > 0);
3185 : :
3186 [ + + ]: 5145 : if (equal(expr, ge_info->expr))
3187 : 2366 : return ge_info->sortgroupref;
3188 : :
3189 [ + - ]: 2923 : if (ge_info->ec == NULL ||
3190 [ + + ]: 2923 : !bms_is_member(((Var *) expr)->varno, ge_info->ec->ec_relids))
3191 : 1367 : continue;
3192 : :
3193 : : /*
3194 : : * Scan the EquivalenceClass, looking for a match to the given
3195 : : * expression. We ignore child members here.
3196 : : */
3197 [ + - + + : 4531 : foreach(lc1, ge_info->ec->ec_members)
+ + ]
3198 : : {
3199 : 3119 : EquivalenceMember *em = (EquivalenceMember *) lfirst(lc1);
3200 : :
3201 : : /* Child members should not exist in ec_members */
3202 [ - + ]: 3119 : Assert(!em->em_is_child);
3203 : :
3204 [ + + ]: 3119 : if (equal(expr, em->em_expr))
3205 : 144 : return ge_info->sortgroupref;
3206 : : }
3207 : : }
3208 : :
3209 : : /* no match is found */
3210 : 2685 : return 0;
3211 : : }
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