ClickHouse/dbms/tests/queries/0_stateless/00525_aggregate_functions_of_nullable_that_return_non_nullable.sql

SELECT k, groupArray(x) AS res1, toTypeName(res1), avg(x) AS res2, toTypeName(res2) FROM (SELECT 1 AS k, arrayJoin([1, NULL, 2]) AS x UNION ALL SELECT 2 AS k, CAST(arrayJoin([NULL, NULL]) AS Nullable(UInt8)) AS x) GROUP BY k ORDER BY k;