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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
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@ -2454,7 +2454,11 @@ ExecInitAgg(Agg *node, EState *estate, int eflags)
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aggstate->hash_pergroup = pergroups;
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find_hash_columns(aggstate);
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build_hash_table(aggstate);
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/* Skip massive memory allocation if we are just doing EXPLAIN */
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if (!(eflags & EXEC_FLAG_EXPLAIN_ONLY))
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build_hash_table(aggstate);
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aggstate->table_filled = false;
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}
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