1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/regress/sql/window.sql b/src/test/regress/sql/window.sql
index 051b50b2d35..e2943a38f1e 100644
--- a/src/test/regress/sql/window.sql
+++ b/src/test/regress/sql/window.sql
@@ -795,6 +795,44 @@ WINDOW w AS (ORDER BY x groups between 1 preceding and 1 following);
 -- with UNION
 SELECT count(*) OVER (PARTITION BY four) FROM (SELECT * FROM tenk1 UNION ALL SELECT * FROM tenk2)s LIMIT 0;
 
+-- check some degenerate cases
+create temp table t1 (f1 int, f2 int8);
+insert into t1 values (1,1),(1,2),(2,2);
+
+select f1, sum(f1) over (partition by f1
+                         range between 1 preceding and 1 following)
+from t1 where f1 = f2;  -- error, must have order by
+explain (costs off)
+select f1, sum(f1) over (partition by f1 order by f2
+                         range between 1 preceding and 1 following)
+from t1 where f1 = f2;
+select f1, sum(f1) over (partition by f1 order by f2
+                         range between 1 preceding and 1 following)
+from t1 where f1 = f2;
+select f1, sum(f1) over (partition by f1, f1 order by f2
+                         range between 2 preceding and 1 preceding)
+from t1 where f1 = f2;
+select f1, sum(f1) over (partition by f1, f2 order by f2
+                         range between 1 following and 2 following)
+from t1 where f1 = f2;
+
+select f1, sum(f1) over (partition by f1
+                         groups between 1 preceding and 1 following)
+from t1 where f1 = f2;  -- error, must have order by
+explain (costs off)
+select f1, sum(f1) over (partition by f1 order by f2
+                         groups between 1 preceding and 1 following)
+from t1 where f1 = f2;
+select f1, sum(f1) over (partition by f1 order by f2
+                         groups between 1 preceding and 1 following)
+from t1 where f1 = f2;
+select f1, sum(f1) over (partition by f1, f1 order by f2
+                         groups between 2 preceding and 1 preceding)
+from t1 where f1 = f2;
+select f1, sum(f1) over (partition by f1, f2 order by f2
+                         groups between 1 following and 2 following)
+from t1 where f1 = f2;
+
 -- ordering by a non-integer constant is allowed
 SELECT rank() OVER (ORDER BY length('abc'));