1 files changed, 17 insertions, 1 deletions
diff --git a/tests/fixtures/optimizer/merge_subqueries.sql b/tests/fixtures/optimizer/merge_subqueries.sql
index 0f22925..f953539 100644
--- a/tests/fixtures/optimizer/merge_subqueries.sql
+++ b/tests/fixtures/optimizer/merge_subqueries.sql
@@ -429,4 +429,20 @@ WHERE
       q.a AS a
     FROM q AS q
   );
-SELECT q.a AS a FROM x AS q WHERE q.a IN (SELECT y.b AS a FROM y AS y);
-\ No newline at end of file
+SELECT q.a AS a FROM x AS q WHERE q.a IN (SELECT y.b AS a FROM y AS y);
+
+# title: dont merge when inner query has ORDER BY and outer query is UNION
+WITH q AS (
+  SELECT
+    x.a AS a
+  FROM x
+  ORDER BY x.a
+)
+SELECT
+  q.a AS a
+FROM q
+UNION ALL
+SELECT
+  1 AS a;
+WITH q AS (SELECT x.a AS a FROM x AS x ORDER BY x.a) SELECT q.a AS a FROM q AS q UNION ALL SELECT 1 AS a;
+