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-rw-r--r--src/backend/optimizer/prep/prepunion.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c
index 8d86e98adc1..61d0770f108 100644
--- a/src/backend/optimizer/prep/prepunion.c
+++ b/src/backend/optimizer/prep/prepunion.c
@@ -330,7 +330,8 @@ recurse_set_operations(Node *setOp, PlannerInfo *root,
* to build a partial path for this relation. But there's no point in
* considering any path but the cheapest.
*/
- if (final_rel->partial_pathlist != NIL)
+ if (rel->consider_parallel && bms_is_empty(rel->lateral_relids) &&
+ final_rel->partial_pathlist != NIL)
{
Path *partial_subpath;
Path *partial_path;