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-rw-r--r--src/backend/executor/functions.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/backend/executor/functions.c b/src/backend/executor/functions.c
index 6c3eff7c584..ce49c471d49 100644
--- a/src/backend/executor/functions.c
+++ b/src/backend/executor/functions.c
@@ -513,6 +513,9 @@ init_execution_state(List *queryTree_list,
errmsg("%s is not allowed in a non-volatile function",
CreateCommandTag(stmt))));
+ if (IsInParallelMode() && !CommandIsReadOnly(stmt))
+ PreventCommandIfParallelMode(CreateCommandTag(stmt));
+
/* OK, build the execution_state for this query */
newes = (execution_state *) palloc(sizeof(execution_state));
if (preves)