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Reduce memory used by partitionwise joins

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Specifically, this commit reduces the memory consumed by the
SpecialJoinInfos that are allocated for child joins in
try_partitionwise_join() by freeing them at the end of creating paths
for each child join.

A SpecialJoinInfo allocated for a given child join is a copy of the
parent join's SpecialJoinInfo, which contains the translated copies
of the various Relids bitmapsets and semi_rhs_exprs, which is a List
of Nodes.  The newly added freeing step frees the struct itself and
the various bitmapsets, but not semi_rhs_exprs, because there's no
handy function to free the memory of Node trees.

Author: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Reviewed-by: Richard Guo <guofenglinux@gmail.com>
Reviewed-by: Amit Langote <amitlangote09@gmail.com>
Reviewed-by: Andrey Lepikhov <a.lepikhov@postgrespro.ru>
Reviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com>
Discussion: https://postgr.es/m/CAExHW5tHqEf3ASVqvFFcghYGPfpy7o3xnvhHwBGbJFMRH8KjNw@mail.gmail.com
This commit is contained in:
Amit Langote
2024-03-25 12:02:40 +09:00
parent 619bc23a1a
commit 5278d0a2e8
3 changed files with 42 additions and 2 deletions
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5
src/backend/optimizer/util/pathnode.c
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@@ -1707,8 +1707,9 @@ create_unique_path(PlannerInfo *root, RelOptInfo *rel, Path *subpath,
pathnode->subpath = subpath;
/*
* Under GEQO, the sjinfo might be short-lived, so we'd better make copies
* of data structures we extract from it.
* Under GEQO and when planning child joins, the sjinfo might be
* short-lived, so we'd better make copies of data structures we extract
* from it.
*/
pathnode->in_operators = copyObject(sjinfo->semi_operators);
pathnode->uniq_exprs = copyObject(sjinfo->semi_rhs_exprs);