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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2020-11-20 14:41:14 +0200 |
|---|---|---|
| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2020-11-20 14:49:25 +0200 |
| commit | 57b5d8484c8a0949c3fa8205a324ac7bf3a377fb (patch) | |
| tree | 63155092c3194ce6bc9de605100618dbc19d6d1a | |
| parent | d01e37845c2262a0b51a59c77ff8ad7b855824f8 (diff) | |
| download | postgresql-57b5d8484c8a0949c3fa8205a324ac7bf3a377fb.tar.gz postgresql-57b5d8484c8a0949c3fa8205a324ac7bf3a377fb.zip | |
Skip allocating hash table in EXPLAIN-only mode.
This is a backpatch of commit 2cccb627f1, backpatched due to popular
demand. Backpatch to all supported versions.
Author: Alexey Bashtanov
Discussion: https://www.postgresql.org/message-id/36823f65-050d-ae24-aa4d-a37726998240%40imap.cc
| -rw-r--r-- | src/backend/executor/nodeAgg.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/backend/executor/nodeAgg.c b/src/backend/executor/nodeAgg.c index 6b274751ba7..f2bb5502b21 100644 --- a/src/backend/executor/nodeAgg.c +++ b/src/backend/executor/nodeAgg.c @@ -2454,7 +2454,11 @@ ExecInitAgg(Agg *node, EState *estate, int eflags) aggstate->hash_pergroup = pergroups; find_hash_columns(aggstate); - build_hash_table(aggstate); + + /* Skip massive memory allocation if we are just doing EXPLAIN */ + if (!(eflags & EXEC_FLAG_EXPLAIN_ONLY)) + build_hash_table(aggstate); + aggstate->table_filled = false; } |