pgsql: Skip allocating hash table in EXPLAIN-only mode.

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pgsql: Skip allocating hash table in EXPLAIN-only mode.

Heikki Linnakangas-5
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

Branch
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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/888fa2baeb39fa4069b1b55552c0ced85b533313

Modified Files
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src/backend/executor/nodeAgg.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)