From 8ef84eeaa1af55d766b89d6f8ba6879abf2678ee Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Tue, 20 Apr 2021 03:16:39 +0300
Subject: [PATCH] Add test for #7815

---
 .../01823_array_low_cardinality_KuliginStepan.reference    | 1 +
 .../01823_array_low_cardinality_KuliginStepan.sql          | 7 +++++++
 2 files changed, 8 insertions(+)
 create mode 100644 tests/queries/0_stateless/01823_array_low_cardinality_KuliginStepan.reference
 create mode 100644 tests/queries/0_stateless/01823_array_low_cardinality_KuliginStepan.sql

diff --git a/tests/queries/0_stateless/01823_array_low_cardinality_KuliginStepan.reference b/tests/queries/0_stateless/01823_array_low_cardinality_KuliginStepan.reference
new file mode 100644
index 00000000000..2439021d2e0
--- /dev/null
+++ b/tests/queries/0_stateless/01823_array_low_cardinality_KuliginStepan.reference
@@ -0,0 +1 @@
+[['a'],['b','c']]
diff --git a/tests/queries/0_stateless/01823_array_low_cardinality_KuliginStepan.sql b/tests/queries/0_stateless/01823_array_low_cardinality_KuliginStepan.sql
new file mode 100644
index 00000000000..528a3b464b3
--- /dev/null
+++ b/tests/queries/0_stateless/01823_array_low_cardinality_KuliginStepan.sql
@@ -0,0 +1,7 @@
+create temporary table test (
+    arr Array(Array(LowCardinality(String)))
+);
+
+insert into test(arr) values ([['a'], ['b', 'c']]);
+
+select arrayFilter(x -> 1, arr) from test;