Stabilize regression tests introduced by 259c96fa8f

Add the ORDER BY clause to new queries to avoid ordering ambiguity.

Per buildfarm member rorqual.

src/test/regress/expected/partition_merge.out

@@ -871,11 +871,12 @@ CREATE TABLE tp_1_2 PARTITION OF t FOR VALUES FROM (1) TO (2);
 ALTER TABLE t MERGE PARTITIONS (tp_0_1, tp_1_2) INTO tp_0_2;
 SELECT c.relname, a.amname
 FROM pg_class c JOIN pg_am a ON c.relam = a.oid
-WHERE c.oid IN ('t'::regclass, 'tp_0_2'::regclass);
+WHERE c.oid IN ('t'::regclass, 'tp_0_2'::regclass)
+ORDER BY c.relname;
  relname |        amname         
 ---------+-----------------------
- tp_0_2  | partitions_merge_heap
  t       | partitions_merge_heap
+ tp_0_2  | partitions_merge_heap
 (2 rows)
 
 DROP TABLE t;

src/test/regress/expected/partition_split.out

@@ -1503,7 +1503,8 @@ ALTER TABLE t SPLIT PARTITION tp_0_2 INTO
    PARTITION tp_1_2 FOR VALUES FROM (1) TO (2));
 SELECT c.relname, a.amname
 FROM pg_class c JOIN pg_am a ON c.relam = a.oid
-WHERE c.oid IN ('t'::regclass, 'tp_0_1'::regclass, 'tp_1_2'::regclass);
+WHERE c.oid IN ('t'::regclass, 'tp_0_1'::regclass, 'tp_1_2'::regclass)
+ORDER BY c.relname;
  relname |        amname        
 ---------+----------------------
  t       | partition_split_heap

src/test/regress/sql/partition_merge.sql

@@ -544,7 +544,8 @@ CREATE TABLE tp_1_2 PARTITION OF t FOR VALUES FROM (1) TO (2);
 ALTER TABLE t MERGE PARTITIONS (tp_0_1, tp_1_2) INTO tp_0_2;
 SELECT c.relname, a.amname
 FROM pg_class c JOIN pg_am a ON c.relam = a.oid
-WHERE c.oid IN ('t'::regclass, 'tp_0_2'::regclass);
+WHERE c.oid IN ('t'::regclass, 'tp_0_2'::regclass)
+ORDER BY c.relname;
 DROP TABLE t;
 DROP ACCESS METHOD partitions_merge_heap;
 

src/test/regress/sql/partition_split.sql

@@ -889,7 +889,8 @@ ALTER TABLE t SPLIT PARTITION tp_0_2 INTO
    PARTITION tp_1_2 FOR VALUES FROM (1) TO (2));
 SELECT c.relname, a.amname
 FROM pg_class c JOIN pg_am a ON c.relam = a.oid
-WHERE c.oid IN ('t'::regclass, 'tp_0_1'::regclass, 'tp_1_2'::regclass);
+WHERE c.oid IN ('t'::regclass, 'tp_0_1'::regclass, 'tp_1_2'::regclass)
+ORDER BY c.relname;
 DROP TABLE t;
 DROP ACCESS METHOD partition_split_heap;