--- a/src/backend/optimizer/util/pathnode.c
+++ b/src/backend/optimizer/util/pathnode.c
@@ -3817,7 +3817,7 @@ do { \
            }
            break;

-       case T_MergeAppend:
+       case T_MergeAppendPath:
            {
                 MergeAppendPath *mapath