diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 342f5ad8d0..acc324122f 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -4819,7 +4819,7 @@ create_partial_distinct_paths(PlannerInfo *root, RelOptInfo *input_rel,
 
 	if (partial_distinct_rel->partial_pathlist != NIL)
 	{
-		generate_gather_paths(root, partial_distinct_rel, true);
+		generate_useful_gather_paths(root, partial_distinct_rel, true);
 		set_cheapest(partial_distinct_rel);
 
 		/*
diff --git a/src/test/regress/expected/select_distinct.out b/src/test/regress/expected/select_distinct.out
index 1f72756ccb..82b8e54f5f 100644
--- a/src/test/regress/expected/select_distinct.out
+++ b/src/test/regress/expected/select_distinct.out
@@ -235,10 +235,10 @@ SELECT DISTINCT four FROM tenk1;
                      QUERY PLAN                     
 ----------------------------------------------------
  Unique
-   ->  Sort
-         Sort Key: four
-         ->  Gather
-               Workers Planned: 2
+   ->  Gather Merge
+         Workers Planned: 2
+         ->  Sort
+               Sort Key: four
                ->  HashAggregate
                      Group Key: four
                      ->  Parallel Seq Scan on tenk1