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-rw-r--r--src/backend/executor/nodeAgg.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/backend/executor/nodeAgg.c b/src/backend/executor/nodeAgg.c
index 1dcd8e19ed2..8f9d588e5a5 100644
--- a/src/backend/executor/nodeAgg.c
+++ b/src/backend/executor/nodeAgg.c
@@ -3073,7 +3073,11 @@ ExecInitAgg(Agg *node, EState *estate, int eflags)
aggstate->hash_pergroup = palloc0(sizeof(AggStatePerGroup) * numHashes);
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;
}