Merging upstream version 6.2.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/fixtures/optimizer/merge_subqueries.sql b/tests/fixtures/optimizer/merge_subqueries.sql
index 35aed3b..e13d3b3 100644
--- a/tests/fixtures/optimizer/merge_subqueries.sql
+++ b/tests/fixtures/optimizer/merge_subqueries.sql
@@ -97,3 +97,11 @@ WITH x AS (SELECT x.a AS a, x.b AS b FROM x AS x) SELECT x.a AS a, y.b AS b FROM
 -- Nested CTE
 SELECT * FROM (WITH x AS (SELECT a, b FROM x) SELECT a, b FROM x);
 SELECT x.a AS a, x.b AS b FROM x AS x;
+
+-- Inner select is an expression
+SELECT a FROM (SELECT a FROM (SELECT COALESCE(a) AS a FROM x LEFT JOIN y ON x.a = y.b) AS x) AS x;
+SELECT COALESCE(x.a) AS a FROM x AS x LEFT JOIN y AS y ON x.a = y.b;
+
+-- CTE select is an expression
+WITH x AS (SELECT COALESCE(a) AS a FROM x LEFT JOIN y ON x.a = y.b) SELECT a FROM (SELECT a FROM x AS x) AS x;
+SELECT COALESCE(x.a) AS a FROM x AS x LEFT JOIN y AS y ON x.a = y.b;