From a93e29ef4a20e3d81bd390822e1b22cead88dfbe Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Wed, 3 Mar 2021 02:00:19 +0300
Subject: [PATCH] Add a test for #14740

---
 .../01747_transform_empty_arrays.reference    |  1 +
 .../01747_transform_empty_arrays.sql          | 27 +++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 tests/queries/0_stateless/01747_transform_empty_arrays.reference
 create mode 100644 tests/queries/0_stateless/01747_transform_empty_arrays.sql

diff --git a/tests/queries/0_stateless/01747_transform_empty_arrays.reference b/tests/queries/0_stateless/01747_transform_empty_arrays.reference
new file mode 100644
index 00000000000..d00491fd7e5
--- /dev/null
+++ b/tests/queries/0_stateless/01747_transform_empty_arrays.reference
@@ -0,0 +1 @@
+1
diff --git a/tests/queries/0_stateless/01747_transform_empty_arrays.sql b/tests/queries/0_stateless/01747_transform_empty_arrays.sql
new file mode 100644
index 00000000000..cc9a00a4555
--- /dev/null
+++ b/tests/queries/0_stateless/01747_transform_empty_arrays.sql
@@ -0,0 +1,27 @@
+SELECT *
+FROM
+(
+    WITH
+
+        (
+            SELECT groupArray(a)
+            FROM
+            (
+                SELECT 1 AS a
+            )
+        ) AS keys,
+
+        (
+            SELECT groupArray(a)
+            FROM
+            (
+                SELECT 2 AS a
+            )
+        ) AS values
+    SELECT *
+    FROM
+    (
+        SELECT 1 AS a
+    )
+    WHERE transform(a, keys, values, 0)
+) AS wrap;