Update some comments that should've covered MERGE

Oversight in 7103ebb7aae8.  Backpatch to 15.

Author: Richard Guo <guofenglinux@gmail.com>
Discussion: https://postgr.es/m/CAMbWs48gnDjZXq3-b56dVpQCNUJ5hD9kdtWN4QFwKCEapspNsA@mail.gmail.com

1 files changed, 7 insertions, 6 deletions

diff --git a/src/backend/optimizer/path/indxpath.c b/src/backend/optimizer/path/indxpath.c
index c31fcc917df..77f3f81bcb6 100644
--- a/src/backend/optimizer/path/indxpath.c
+++ b/src/backend/optimizer/path/indxpath.c
@@ -3393,12 +3393,13 @@ check_index_predicates(PlannerInfo *root, RelOptInfo *rel)
 	 * Normally we remove quals that are implied by a partial index's
 	 * predicate from indrestrictinfo, indicating that they need not be
 	 * checked explicitly by an indexscan plan using this index.  However, if
-	 * the rel is a target relation of UPDATE/DELETE/SELECT FOR UPDATE, we
-	 * cannot remove such quals from the plan, because they need to be in the
-	 * plan so that they will be properly rechecked by EvalPlanQual testing.
-	 * Some day we might want to remove such quals from the main plan anyway
-	 * and pass them through to EvalPlanQual via a side channel; but for now,
-	 * we just don't remove implied quals at all for target relations.
+	 * the rel is a target relation of UPDATE/DELETE/MERGE/SELECT FOR UPDATE,
+	 * we cannot remove such quals from the plan, because they need to be in
+	 * the plan so that they will be properly rechecked by EvalPlanQual
+	 * testing.  Some day we might want to remove such quals from the main
+	 * plan anyway and pass them through to EvalPlanQual via a side channel;
+	 * but for now, we just don't remove implied quals at all for target
+	 * relations.
 	 */
 	is_target_rel = (bms_is_member(rel->relid, root->all_result_relids) ||
 					 get_plan_rowmark(root->rowMarks, rel->relid) != NULL);