diff --git a/tests/queries/0_stateless/03224_arrayUnion.reference b/tests/queries/0_stateless/03224_arrayUnion.reference
new file mode 100644
index 00000000000..f6ab78b71fd
--- /dev/null
+++ b/tests/queries/0_stateless/03224_arrayUnion.reference
@@ -0,0 +1,73 @@
+[1,2]
+[1,2]
+[1,2]
+[1,2,3]
+-------
+[]
+[1]
+[1,2]
+[1,2,3]
+-------
+[]
+[1]
+[1,2]
+[1,2,3]
+-------
+[1,2]
+[1,2]
+[1,2]
+[1,2,3]
+-------
+[1,2,3,4]
+[1,2,3,4]
+[1,2,3,4]
+[1,2,3,4]
+-------
+[]
+[]
+[]
+[]
+-------
+[1,2]
+[1,2]
+[1,2]
+[1,2,3]
+-------
+[]
+[1]
+[1,2]
+[1,2,3]
+-------
+[]
+[1]
+[1,2]
+[1,2,3]
+-------
+[1,2]
+[1,2]
+[1,2]
+[1,2,3]
+-------
+[1,2,3,4]
+[1,2,3,4]
+[1,2,3,4]
+[1,2,3,4]
+-------
+[]
+[]
+[]
+[]
+-------
+[-100,156]
+-------
+[-257,-100,1]
+-------
+['hello','hi']
+-------
+[1,2,3,NULL]
+-------
+[1,2,3,NULL]
+-------
+[1,2,3,4,5,10,20]
+-------
+[1,2,3]
diff --git a/tests/queries/0_stateless/03224_arrayUnion.sql b/tests/queries/0_stateless/03224_arrayUnion.sql
new file mode 100644
index 00000000000..da8032524ad
--- /dev/null
+++ b/tests/queries/0_stateless/03224_arrayUnion.sql
@@ -0,0 +1,53 @@
+drop table if exists array_union;
+
+create table array_union (date Date, arr Array(UInt8)) engine=MergeTree partition by date order by date;
+
+insert into array_union values ('2019-01-01', [1,2,3]);
+insert into array_union values ('2019-01-01', [1,2]);
+insert into array_union values ('2019-01-01', [1]);
+insert into array_union values ('2019-01-01', []);
+
+
+select arraySort(arrayUnion(arr, [1,2])) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion(arr, [])) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion([], arr)) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion([1,2], arr)) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion([1,2], [1,2,3,4])) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion([], [])) from array_union order by arr;
+select '-------';
+
+optimize table array_union;
+
+select arraySort(arrayUnion(arr, [1,2])) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion(arr, [])) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion([], arr)) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion([1,2], arr)) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion([1,2], [1,2,3,4])) from array_union order by arr;
+select '-------';
+select arraySort(arrayUnion([], [])) from array_union order by arr;
+
+drop table if exists array_union;
+
+select '-------';
+select arraySort(arrayUnion([-100], [156]));
+select '-------';
+select arraySort(arrayUnion([1], [-257, -100]));
+select '-------';
+select arraySort(arrayUnion(['hi'], ['hello', 'hi'], []));
+select '-------';
+SELECT arraySort(arrayUnion([1, 2, NULL], [1, 3, NULL], [2, 3, NULL]));
+select '-------';
+SELECT arraySort(arrayUnion([NULL, NULL, NULL, 1], [1, NULL, NULL], [1, 2, 3, NULL]));
+select '-------';
+SELECT arraySort(arrayUnion([1, 1, 1, 2, 3], [2, 2, 4], [5, 10, 20]));
+select '-------';
+SELECT arraySort(arrayUnion([1, 2], [1, 3], [])),