From 58c47ccfff20b8c125903482725c1dbfd30beade Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Sat, 29 Feb 2020 13:48:09 -0500 Subject: [PATCH] Correctly re-use hash tables in buildSubPlanHash(). Commit 356687bd8 omitted to remove leftover code for destroying a hashed subplan's hash tables, with the result that the tables were always rebuilt not reused; this leads to severe memory leakage if a hashed subplan is re-executed enough times. Moreover, the code for reusing the hashnulls table had a typo that would have made it do the wrong thing if it were reached. Looking at the code coverage report shows severe under-coverage of the potential callers of ResetTupleHashTable, so add some test cases that exercise them. Andreas Karlsson and Tom Lane, per reports from Ranier Vilela and Justin Pryzby. Backpatch to v11, as the faulty commit was. Discussion: https://postgr.es/m/edb62547-c453-c35b-3ed6-a069e4d6b937@proxel.se Discussion: https://postgr.es/m/CAEudQAo=DCebm1RXtig9OH+QivpS97sMkikt0A9qHmMUs+g6ZA@mail.gmail.com Discussion: https://postgr.es/m/20200210032547.GA1412@telsasoft.com --- src/backend/executor/nodeSubplan.c | 6 +- src/test/regress/expected/subselect.out | 123 ++++++++++++++++++++++++ src/test/regress/sql/subselect.sql | 65 +++++++++++++ 3 files changed, 191 insertions(+), 3 deletions(-) diff --git a/src/backend/executor/nodeSubplan.c b/src/backend/executor/nodeSubplan.c index ff95317879..298b7757f5 100644 --- a/src/backend/executor/nodeSubplan.c +++ b/src/backend/executor/nodeSubplan.c @@ -495,8 +495,6 @@ buildSubPlanHash(SubPlanState *node, ExprContext *econtext) * need to store subplan output rows that contain NULL. */ MemoryContextReset(node->hashtablecxt); - node->hashtable = NULL; - node->hashnulls = NULL; node->havehashrows = false; node->havenullrows = false; @@ -533,7 +531,7 @@ buildSubPlanHash(SubPlanState *node, ExprContext *econtext) } if (node->hashnulls) - ResetTupleHashTable(node->hashtable); + ResetTupleHashTable(node->hashnulls); else node->hashnulls = BuildTupleHashTableExt(node->parent, node->descRight, @@ -549,6 +547,8 @@ buildSubPlanHash(SubPlanState *node, ExprContext *econtext) node->hashtempcxt, false); } + else + node->hashnulls = NULL; /* * We are probably in a short-lived expression-evaluation context. Switch diff --git a/src/test/regress/expected/subselect.out b/src/test/regress/expected/subselect.out index 71a677b768..4c6cd5f146 100644 --- a/src/test/regress/expected/subselect.out +++ b/src/test/regress/expected/subselect.out @@ -873,6 +873,129 @@ explain (verbose, costs off) One-Time Filter: ("*VALUES*".column1 = "*VALUES*".column1) (8 rows) +-- +-- Test rescan of a hashed subplan (the use of random() is to prevent the +-- sub-select from being pulled up, which would result in not hashing) +-- +explain (verbose, costs off) +select sum(ss.tst::int) from + onek o cross join lateral ( + select i.ten in (select f1 from int4_tbl where f1 <= o.hundred) as tst, + random() as r + from onek i where i.unique1 = o.unique1 ) ss +where o.ten = 0; + QUERY PLAN +--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- + Aggregate + Output: sum((((hashed SubPlan 1)))::integer) + -> Nested Loop + Output: ((hashed SubPlan 1)) + -> Seq Scan on public.onek o + Output: o.unique1, o.unique2, o.two, o.four, o.ten, o.twenty, o.hundred, o.thousand, o.twothousand, o.fivethous, o.tenthous, o.odd, o.even, o.stringu1, o.stringu2, o.string4 + Filter: (o.ten = 0) + -> Index Scan using onek_unique1 on public.onek i + Output: (hashed SubPlan 1), random() + Index Cond: (i.unique1 = o.unique1) + SubPlan 1 + -> Seq Scan on public.int4_tbl + Output: int4_tbl.f1 + Filter: (int4_tbl.f1 <= $0) +(14 rows) + +select sum(ss.tst::int) from + onek o cross join lateral ( + select i.ten in (select f1 from int4_tbl where f1 <= o.hundred) as tst, + random() as r + from onek i where i.unique1 = o.unique1 ) ss +where o.ten = 0; + sum +----- + 100 +(1 row) + +-- +-- Test rescan of a SetOp node +-- +explain (costs off) +select count(*) from + onek o cross join lateral ( + select * from onek i1 where i1.unique1 = o.unique1 + except + select * from onek i2 where i2.unique1 = o.unique2 + ) ss +where o.ten = 1; + QUERY PLAN +------------------------------------------------------------------------------ + Aggregate + -> Nested Loop + -> Seq Scan on onek o + Filter: (ten = 1) + -> Subquery Scan on ss + -> HashSetOp Except + -> Append + -> Subquery Scan on "*SELECT* 1" + -> Index Scan using onek_unique1 on onek i1 + Index Cond: (unique1 = o.unique1) + -> Subquery Scan on "*SELECT* 2" + -> Index Scan using onek_unique1 on onek i2 + Index Cond: (unique1 = o.unique2) +(13 rows) + +select count(*) from + onek o cross join lateral ( + select * from onek i1 where i1.unique1 = o.unique1 + except + select * from onek i2 where i2.unique1 = o.unique2 + ) ss +where o.ten = 1; + count +------- + 100 +(1 row) + +-- +-- Test rescan of a RecursiveUnion node +-- +explain (costs off) +select sum(o.four), sum(ss.a) from + onek o cross join lateral ( + with recursive x(a) as + (select o.four as a + union + select a + 1 from x + where a < 10) + select * from x + ) ss +where o.ten = 1; + QUERY PLAN +--------------------------------------------------- + Aggregate + -> Nested Loop + -> Seq Scan on onek o + Filter: (ten = 1) + -> CTE Scan on x + CTE x + -> Recursive Union + -> Result + -> WorkTable Scan on x x_1 + Filter: (a < 10) +(10 rows) + +select sum(o.four), sum(ss.a) from + onek o cross join lateral ( + with recursive x(a) as + (select o.four as a + union + select a + 1 from x + where a < 10) + select * from x + ) ss +where o.ten = 1; + sum | sum +------+------ + 1700 | 5350 +(1 row) + -- -- Check we don't misoptimize a NOT IN where the subquery returns no rows. -- diff --git a/src/test/regress/sql/subselect.sql b/src/test/regress/sql/subselect.sql index bd8d2f63d8..893d8d0f62 100644 --- a/src/test/regress/sql/subselect.sql +++ b/src/test/regress/sql/subselect.sql @@ -493,6 +493,71 @@ explain (verbose, costs off) select x, x from (select (select random() where y=y) as x from (values(1),(2)) v(y)) ss; +-- +-- Test rescan of a hashed subplan (the use of random() is to prevent the +-- sub-select from being pulled up, which would result in not hashing) +-- +explain (verbose, costs off) +select sum(ss.tst::int) from + onek o cross join lateral ( + select i.ten in (select f1 from int4_tbl where f1 <= o.hundred) as tst, + random() as r + from onek i where i.unique1 = o.unique1 ) ss +where o.ten = 0; + +select sum(ss.tst::int) from + onek o cross join lateral ( + select i.ten in (select f1 from int4_tbl where f1 <= o.hundred) as tst, + random() as r + from onek i where i.unique1 = o.unique1 ) ss +where o.ten = 0; + +-- +-- Test rescan of a SetOp node +-- +explain (costs off) +select count(*) from + onek o cross join lateral ( + select * from onek i1 where i1.unique1 = o.unique1 + except + select * from onek i2 where i2.unique1 = o.unique2 + ) ss +where o.ten = 1; + +select count(*) from + onek o cross join lateral ( + select * from onek i1 where i1.unique1 = o.unique1 + except + select * from onek i2 where i2.unique1 = o.unique2 + ) ss +where o.ten = 1; + +-- +-- Test rescan of a RecursiveUnion node +-- +explain (costs off) +select sum(o.four), sum(ss.a) from + onek o cross join lateral ( + with recursive x(a) as + (select o.four as a + union + select a + 1 from x + where a < 10) + select * from x + ) ss +where o.ten = 1; + +select sum(o.four), sum(ss.a) from + onek o cross join lateral ( + with recursive x(a) as + (select o.four as a + union + select a + 1 from x + where a < 10) + select * from x + ) ss +where o.ten = 1; + -- -- Check we don't misoptimize a NOT IN where the subquery returns no rows. --