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Commit3c90dcd

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committed
Fix calculation of relid sets for partitionwise child joins.
Applying add_outer_joins_to_relids() to a child join doesn't actuallywork, even if we've built a SpecialJoinInfo specialized to the child,because that function will also compare the join's relids to elementsof the main join_info_list, which only deal in regular relids notchild relids. This mistake escaped detection by the existingpartitionwise join tests because they didn't test any cases whereadd_outer_joins_to_relids() needs to add additional OJ relids (thatis, any cases where join reordering per identity 3 is possible).Instead, let's apply adjust_child_relids() to the relids of the parentjoin. This requires minor code reordering to collect the relevantAppendRelInfo structures first, but that's work we'd do shortly anyway.Report and fix by Richard Guo; cosmetic changes by meDiscussion:https://postgr.es/m/CAMbWs49NCNbyubZWgci3o=_OTY=snCfAPtMnM-32f3mm-K-Ckw@mail.gmail.com
1 parent7c7412c commit3c90dcd

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4 files changed

+75
-12
lines changed

4 files changed

+75
-12
lines changed

‎src/backend/optimizer/path/joinrels.c‎

Lines changed: 8 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -1640,13 +1640,15 @@ try_partitionwise_join(PlannerInfo *root, RelOptInfo *rel1, RelOptInfo *rel2,
16401640
child_rel1->relids,
16411641
child_rel2->relids);
16421642

1643-
/* Build correct join relids for child join */
1644-
child_joinrelids=bms_union(child_rel1->relids,child_rel2->relids);
1645-
child_joinrelids=add_outer_joins_to_relids(root,child_joinrelids,
1646-
child_sjinfo,NULL);
1647-
16481643
/* Find the AppendRelInfo structures */
1649-
appinfos=find_appinfos_by_relids(root,child_joinrelids,&nappinfos);
1644+
appinfos=find_appinfos_by_relids(root,
1645+
bms_union(child_rel1->relids,
1646+
child_rel2->relids),
1647+
&nappinfos);
1648+
1649+
/* Build correct join relids for child join */
1650+
child_joinrelids=adjust_child_relids(joinrel->relids,
1651+
nappinfos,appinfos);
16501652

16511653
/*
16521654
* Construct restrictions applicable to the child join from those

‎src/backend/optimizer/util/relnode.c‎

Lines changed: 12 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -871,10 +871,19 @@ build_child_join_rel(PlannerInfo *root, RelOptInfo *outer_rel,
871871
/* The parent joinrel should have consider_partitionwise_join set. */
872872
Assert(parent_joinrel->consider_partitionwise_join);
873873

874+
/*
875+
* Find the AppendRelInfo structures for the child baserels. We'll need
876+
* these for computing the child join's relid set, and later for mapping
877+
* Vars to the child rel.
878+
*/
879+
appinfos=find_appinfos_by_relids(root,
880+
bms_union(outer_rel->relids,
881+
inner_rel->relids),
882+
&nappinfos);
883+
874884
joinrel->reloptkind=RELOPT_OTHER_JOINREL;
875-
joinrel->relids=bms_union(outer_rel->relids,inner_rel->relids);
876-
joinrel->relids=add_outer_joins_to_relids(root,joinrel->relids,sjinfo,
877-
NULL);
885+
joinrel->relids=adjust_child_relids(parent_joinrel->relids,
886+
nappinfos,appinfos);
878887
joinrel->rows=0;
879888
/* cheap startup cost is interesting iff not all tuples to be retrieved */
880889
joinrel->consider_startup= (root->tuple_fraction>0);
@@ -935,9 +944,6 @@ build_child_join_rel(PlannerInfo *root, RelOptInfo *outer_rel,
935944
/* Compute information relevant to foreign relations. */
936945
set_foreign_rel_properties(joinrel,outer_rel,inner_rel);
937946

938-
/* Compute information needed for mapping Vars to the child rel */
939-
appinfos=find_appinfos_by_relids(root,joinrel->relids,&nappinfos);
940-
941947
/* Set up reltarget struct */
942948
build_child_join_reltarget(root,parent_joinrel,joinrel,
943949
nappinfos,appinfos);

‎src/test/regress/expected/partition_join.out‎

Lines changed: 46 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -62,6 +62,52 @@ SELECT t1.a, t1.c, t2.b, t2.c FROM prt1 t1, prt2 t2 WHERE t1.a = t2.b AND t1.b =
6262
450 | 0450 | 450 | 0450
6363
(4 rows)
6464

65+
-- left outer join, 3-way
66+
EXPLAIN (COSTS OFF)
67+
SELECT COUNT(*) FROM prt1 t1
68+
LEFT JOIN prt1 t2 ON t1.a = t2.a
69+
LEFT JOIN prt1 t3 ON t2.a = t3.a;
70+
QUERY PLAN
71+
--------------------------------------------------------
72+
Aggregate
73+
-> Append
74+
-> Hash Left Join
75+
Hash Cond: (t2_1.a = t3_1.a)
76+
-> Hash Left Join
77+
Hash Cond: (t1_1.a = t2_1.a)
78+
-> Seq Scan on prt1_p1 t1_1
79+
-> Hash
80+
-> Seq Scan on prt1_p1 t2_1
81+
-> Hash
82+
-> Seq Scan on prt1_p1 t3_1
83+
-> Hash Left Join
84+
Hash Cond: (t2_2.a = t3_2.a)
85+
-> Hash Left Join
86+
Hash Cond: (t1_2.a = t2_2.a)
87+
-> Seq Scan on prt1_p2 t1_2
88+
-> Hash
89+
-> Seq Scan on prt1_p2 t2_2
90+
-> Hash
91+
-> Seq Scan on prt1_p2 t3_2
92+
-> Hash Left Join
93+
Hash Cond: (t2_3.a = t3_3.a)
94+
-> Hash Left Join
95+
Hash Cond: (t1_3.a = t2_3.a)
96+
-> Seq Scan on prt1_p3 t1_3
97+
-> Hash
98+
-> Seq Scan on prt1_p3 t2_3
99+
-> Hash
100+
-> Seq Scan on prt1_p3 t3_3
101+
(29 rows)
102+
103+
SELECT COUNT(*) FROM prt1 t1
104+
LEFT JOIN prt1 t2 ON t1.a = t2.a
105+
LEFT JOIN prt1 t3 ON t2.a = t3.a;
106+
count
107+
-------
108+
300
109+
(1 row)
110+
65111
-- left outer join, with whole-row reference; partitionwise join does not apply
66112
EXPLAIN (COSTS OFF)
67113
SELECT t1, t2 FROM prt1 t1 LEFT JOIN prt2 t2 ON t1.a = t2.b WHERE t1.b = 0 ORDER BY t1.a, t2.b;

‎src/test/regress/sql/partition_join.sql‎

Lines changed: 9 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -34,6 +34,15 @@ EXPLAIN (COSTS OFF)
3434
SELECTt1.a,t1.c,t2.b,t2.cFROM prt1 t1, prt2 t2WHEREt1.a=t2.bANDt1.b=0ORDER BYt1.a,t2.b;
3535
SELECTt1.a,t1.c,t2.b,t2.cFROM prt1 t1, prt2 t2WHEREt1.a=t2.bANDt1.b=0ORDER BYt1.a,t2.b;
3636

37+
-- left outer join, 3-way
38+
EXPLAIN (COSTS OFF)
39+
SELECTCOUNT(*)FROM prt1 t1
40+
LEFT JOIN prt1 t2ONt1.a=t2.a
41+
LEFT JOIN prt1 t3ONt2.a=t3.a;
42+
SELECTCOUNT(*)FROM prt1 t1
43+
LEFT JOIN prt1 t2ONt1.a=t2.a
44+
LEFT JOIN prt1 t3ONt2.a=t3.a;
45+
3746
-- left outer join, with whole-row reference; partitionwise join does not apply
3847
EXPLAIN (COSTS OFF)
3948
SELECT t1, t2FROM prt1 t1LEFT JOIN prt2 t2ONt1.a=t2.bWHEREt1.b=0ORDER BYt1.a,t2.b;

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