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Skip allocating hash table in EXPLAIN-only mode.

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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
This commit is contained in:
Heikki Linnakangas 2020-11-20 14:41:14 +02:00
parent e7abc11116
commit 02a2dbe91d
1 changed files with 4 additions and 1 deletions
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5
src/backend/executor/nodeAgg.c
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@ -2664,7 +2664,10 @@ ExecInitAgg(Agg *node, EState *estate, int eflags)
if (node->aggstrategy == AGG_HASHED) if (node->aggstrategy == AGG_HASHED)
{ {
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; aggstate->table_filled = false;
/* Compute the columns we actually need to hash on */ /* Compute the columns we actually need to hash on */
aggstate->hash_needed = find_hash_columns(aggstate); aggstate->hash_needed = find_hash_columns(aggstate);