From: Tom Lane Date: Wed, 8 Aug 2018 15:44:50 +0000 (-0400) Subject: Match RelOptInfos by relids not pointer equality. X-Git-Tag: REL_12_BETA1~1753 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=11e22e486d8da6cef4d954c6f2952097df276fa7;p=postgresql Match RelOptInfos by relids not pointer equality. Commit 1c2cb2744 added some code that tried to detect whether two RelOptInfos were the "same" rel by pointer comparison; but it turns out that inheritance_planner breaks that, through its shenanigans with copying some relations forward into new subproblems. Compare relid sets instead. Add a regression test case to exercise this area. Problem reported by Rushabh Lathia; diagnosis and fix by Amit Langote, modified a bit by me. Discussion: https://postgr.es/m/CAGPqQf3anJGj65bqAQ9edDr8gF7qig6_avRgwMT9MsZ19COUPw@mail.gmail.com --- diff --git a/src/backend/partitioning/partprune.c b/src/backend/partitioning/partprune.c index 752810d0e4..7fb53e6446 100644 --- a/src/backend/partitioning/partprune.c +++ b/src/backend/partitioning/partprune.c @@ -384,7 +384,7 @@ make_partitionedrel_pruneinfo(PlannerInfo *root, RelOptInfo *parentrel, * because in later iterations of the loop for child partitions, * we want to translate from parent to child variables. */ - if (parentrel != subpart) + if (!bms_equal(parentrel->relids, subpart->relids)) { int nappinfos; AppendRelInfo **appinfos = find_appinfos_by_relids(root, diff --git a/src/test/regress/expected/partition_prune.out b/src/test/regress/expected/partition_prune.out index 358eccad70..693c348185 100644 --- a/src/test/regress/expected/partition_prune.out +++ b/src/test/regress/expected/partition_prune.out @@ -2477,6 +2477,85 @@ deallocate ab_q2; deallocate ab_q3; deallocate ab_q4; deallocate ab_q5; +-- UPDATE on a partition subtree has been seen to have problems. +insert into ab values (1,2); +explain (analyze, costs off, summary off, timing off) +update ab_a1 set b = 3 from ab where ab.a = 1 and ab.a = ab_a1.a; + QUERY PLAN +------------------------------------------------------------------------------------- + Update on ab_a1 (actual rows=0 loops=1) + Update on ab_a1_b1 + Update on ab_a1_b2 + Update on ab_a1_b3 + -> Nested Loop (actual rows=0 loops=1) + -> Append (actual rows=1 loops=1) + -> Bitmap Heap Scan on ab_a1_b1 ab_a1_b1_1 (actual rows=0 loops=1) + Recheck Cond: (a = 1) + -> Bitmap Index Scan on ab_a1_b1_a_idx (actual rows=0 loops=1) + Index Cond: (a = 1) + -> Bitmap Heap Scan on ab_a1_b2 ab_a1_b2_1 (actual rows=1 loops=1) + Recheck Cond: (a = 1) + Heap Blocks: exact=1 + -> Bitmap Index Scan on ab_a1_b2_a_idx (actual rows=1 loops=1) + Index Cond: (a = 1) + -> Bitmap Heap Scan on ab_a1_b3 ab_a1_b3_1 (actual rows=0 loops=1) + Recheck Cond: (a = 1) + -> Bitmap Index Scan on ab_a1_b3_a_idx (actual rows=0 loops=1) + Index Cond: (a = 1) + -> Materialize (actual rows=0 loops=1) + -> Bitmap Heap Scan on ab_a1_b1 (actual rows=0 loops=1) + Recheck Cond: (a = 1) + -> Bitmap Index Scan on ab_a1_b1_a_idx (actual rows=0 loops=1) + Index Cond: (a = 1) + -> Nested Loop (actual rows=1 loops=1) + -> Append (actual rows=1 loops=1) + -> Bitmap Heap Scan on ab_a1_b1 ab_a1_b1_1 (actual rows=0 loops=1) + Recheck Cond: (a = 1) + -> Bitmap Index Scan on ab_a1_b1_a_idx (actual rows=0 loops=1) + Index Cond: (a = 1) + -> Bitmap Heap Scan on ab_a1_b2 ab_a1_b2_1 (actual rows=1 loops=1) + Recheck Cond: (a = 1) + Heap Blocks: exact=1 + -> Bitmap Index Scan on ab_a1_b2_a_idx (actual rows=1 loops=1) + Index Cond: (a = 1) + -> Bitmap Heap Scan on ab_a1_b3 ab_a1_b3_1 (actual rows=0 loops=1) + Recheck Cond: (a = 1) + -> Bitmap Index Scan on ab_a1_b3_a_idx (actual rows=1 loops=1) + Index Cond: (a = 1) + -> Materialize (actual rows=1 loops=1) + -> Bitmap Heap Scan on ab_a1_b2 (actual rows=1 loops=1) + Recheck Cond: (a = 1) + Heap Blocks: exact=1 + -> Bitmap Index Scan on ab_a1_b2_a_idx (actual rows=1 loops=1) + Index Cond: (a = 1) + -> Nested Loop (actual rows=0 loops=1) + -> Append (actual rows=1 loops=1) + -> Bitmap Heap Scan on ab_a1_b1 ab_a1_b1_1 (actual rows=0 loops=1) + Recheck Cond: (a = 1) + -> Bitmap Index Scan on ab_a1_b1_a_idx (actual rows=0 loops=1) + Index Cond: (a = 1) + -> Bitmap Heap Scan on ab_a1_b2 ab_a1_b2_1 (actual rows=1 loops=1) + Recheck Cond: (a = 1) + Heap Blocks: exact=1 + -> Bitmap Index Scan on ab_a1_b2_a_idx (actual rows=1 loops=1) + Index Cond: (a = 1) + -> Bitmap Heap Scan on ab_a1_b3 ab_a1_b3_1 (actual rows=0 loops=1) + Recheck Cond: (a = 1) + -> Bitmap Index Scan on ab_a1_b3_a_idx (actual rows=1 loops=1) + Index Cond: (a = 1) + -> Materialize (actual rows=0 loops=1) + -> Bitmap Heap Scan on ab_a1_b3 (actual rows=0 loops=1) + Recheck Cond: (a = 1) + -> Bitmap Index Scan on ab_a1_b3_a_idx (actual rows=1 loops=1) + Index Cond: (a = 1) +(65 rows) + +table ab; + a | b +---+--- + 1 | 3 +(1 row) + drop table ab, lprt_a; -- Join create table tbl1(col1 int); diff --git a/src/test/regress/sql/partition_prune.sql b/src/test/regress/sql/partition_prune.sql index 035ea49ccb..935c509b29 100644 --- a/src/test/regress/sql/partition_prune.sql +++ b/src/test/regress/sql/partition_prune.sql @@ -554,6 +554,12 @@ deallocate ab_q3; deallocate ab_q4; deallocate ab_q5; +-- UPDATE on a partition subtree has been seen to have problems. +insert into ab values (1,2); +explain (analyze, costs off, summary off, timing off) +update ab_a1 set b = 3 from ab where ab.a = 1 and ab.a = ab_a1.a; +table ab; + drop table ab, lprt_a; -- Join