From ba2d8b0fac1812b6ca09398a9ef4778690cc3201 Mon Sep 17 00:00:00 2001
From: aykut-bozkurt <51649454+aykut-bozkurt@users.noreply.github.com>
Date: Fri, 17 Feb 2023 14:15:09 +0300
Subject: [PATCH] fix single tuple result memory leak (#6724)

We should not omit to free PGResult when we receive single tuple result
from an internal backend.
Single tuple results are normally freed by our ReceiveResults for
`tupleDescriptor != NULL` flow but not for those with `tupleDescriptor
== NULL`. See PR #6722 for details.

DESCRIPTION: Fixes memory leak issue with query results that returns
single row.

(cherry picked from commit 9e69dd0e7fac2f8854618941c51ce0d7654ba4f3)
---
 src/backend/distributed/executor/adaptive_executor.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/backend/distributed/executor/adaptive_executor.c b/src/backend/distributed/executor/adaptive_executor.c
index 948d65791..1f9bf8d45 100644
--- a/src/backend/distributed/executor/adaptive_executor.c
+++ b/src/backend/distributed/executor/adaptive_executor.c
@@ -4558,6 +4558,7 @@ ReceiveResults(WorkerSession *session, bool storeRows)
 		TupleDesc tupleDescriptor = tupleDest->tupleDescForQuery(tupleDest, queryIndex);
 		if (tupleDescriptor == NULL)
 		{
+			PQclear(result);
 			continue;
 		}