diff --strip-trailing-cr -U3 C:/cirrus/src/test/regress/expected/subselect.out C:/cirrus/build/testrun/pg_upgrade/002_pg_upgrade/data/results/subselect.out
--- C:/cirrus/src/test/regress/expected/subselect.out	2024-12-25 02:18:12.988955400 +0000
+++ C:/cirrus/build/testrun/pg_upgrade/002_pg_upgrade/data/results/subselect.out	2024-12-25 02:20:43.914777300 +0000
@@ -2831,15 +2831,16 @@
 EXPLAIN (COSTS OFF)
 SELECT c.oid,c.relname FROM pg_class c JOIN pg_am a USING (oid)
 WHERE c.oid IN (VALUES (1), (2));
-                          QUERY PLAN                           
----------------------------------------------------------------
- Hash Join
-   Hash Cond: (a.oid = c.oid)
-   ->  Seq Scan on pg_am a
-   ->  Hash
-         ->  Index Scan using pg_class_oid_index on pg_class c
-               Index Cond: (oid = ANY ('{1,2}'::integer[]))
-(6 rows)
+                       QUERY PLAN                        
+---------------------------------------------------------
+ Merge Join
+   Merge Cond: (c.oid = a.oid)
+   ->  Index Scan using pg_class_oid_index on pg_class c
+         Index Cond: (oid = ANY ('{1,2}'::integer[]))
+   ->  Sort
+         Sort Key: a.oid
+         ->  Seq Scan on pg_am a
+(7 rows)
 
 -- Complexity of test expression doesn't matter
 EXPLAIN (COSTS OFF)