diff --git a/src/backend/optimizer/plan/setrefs.c b/src/backend/optimizer/plan/setrefs.c
index 69dd327f0c9..cd540a0df5b 100644
--- a/src/backend/optimizer/plan/setrefs.c
+++ b/src/backend/optimizer/plan/setrefs.c
@@ -851,6 +851,60 @@ set_plan_refs(PlannerInfo *root, Plan *plan, int rtoffset)
                        fix_scan_list(root, splan->exclRelTlist, rtoffset);
                }

+               /*
+                * The MERGE produces the target rows by performing a right