1 files changed, 9 insertions, 0 deletions
diff --git a/src/backend/executor/nodeSetOp.c b/src/backend/executor/nodeSetOp.c
index 7b223a7ca3a..5aabed18a09 100644
--- a/src/backend/executor/nodeSetOp.c
+++ b/src/backend/executor/nodeSetOp.c
@@ -111,6 +111,15 @@ build_hash_table(SetOpState *setopstate)
 												false);
 }
 
+/* Planner support routine to estimate space needed for hash table */
+Size
+EstimateSetOpHashTableSpace(double nentries, Size tupleWidth)
+{
+	return EstimateTupleHashTableSpace(nentries,
+									   tupleWidth,
+									   sizeof(SetOpStatePerGroupData));
+}
+
 /*
  * We've completed processing a tuple group.  Decide how many copies (if any)
  * of its representative row to emit, and store the count into numOutput.