diff -U3 /tmp/cirrus-ci-build/contrib/pg_stat_statements/expected/level_tracking.out /tmp/cirrus-ci-build/build/testrun/pg_stat_statements/regress/results/level_tracking.out
--- /tmp/cirrus-ci-build/contrib/pg_stat_statements/expected/level_tracking.out	2024-11-12 14:26:31.740650000 +0000
+++ /tmp/cirrus-ci-build/build/testrun/pg_stat_statements/regress/results/level_tracking.out	2024-11-12 14:29:25.297294000 +0000
@@ -383,26 +383,24 @@
 (1 row)
 
 EXPLAIN (COSTS OFF) SELECT 1, 2 UNION SELECT 3, 4\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3) UNION SELECT 3, 4, 5;
+      QUERY PLAN       
+-----------------------
+ HashAggregate
+   Group Key: (1), (2)
+   ->  Append
+         ->  Result
+         ->  Result
+(5 rows)
+
          QUERY PLAN         
 ----------------------------
- Unique
-   ->  Sort
-         Sort Key: (1), (2)
-         ->  Append
-               ->  Result
-               ->  Result
-(6 rows)
+ HashAggregate
+   Group Key: (1), (2), (3)
+   ->  Append
+         ->  Result
+         ->  Result
+(5 rows)
 
-           QUERY PLAN            
----------------------------------
- Unique
-   ->  Sort
-         Sort Key: (1), (2), (3)
-         ->  Append
-               ->  Result
-               ->  Result
-(6 rows)
-
 SELECT toplevel, calls, query FROM pg_stat_statements
   ORDER BY query COLLATE "C";
  toplevel | calls |                              query                              
@@ -671,25 +669,23 @@
 (1 row)
 
 EXPLAIN (COSTS OFF) SELECT 1, 2 UNION SELECT 3, 4\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3) UNION SELECT 3, 4, 5;
+      QUERY PLAN       
+-----------------------
+ HashAggregate
+   Group Key: (1), (2)
+   ->  Append
+         ->  Result
+         ->  Result
+(5 rows)
+
          QUERY PLAN         
 ----------------------------
- Unique
-   ->  Sort
-         Sort Key: (1), (2)
-         ->  Append
-               ->  Result
-               ->  Result
-(6 rows)
-
-           QUERY PLAN            
----------------------------------
- Unique
-   ->  Sort
-         Sort Key: (1), (2), (3)
-         ->  Append
-               ->  Result
-               ->  Result
-(6 rows)
+ HashAggregate
+   Group Key: (1), (2), (3)
+   ->  Append
+         ->  Result
+         ->  Result
+(5 rows)
 
 SELECT toplevel, calls, query FROM pg_stat_statements
   ORDER BY query COLLATE "C";