ClickHouse/dbms/tests/queries/0_stateless/00420_null_in_scalar_subqueries.sql

SELECT (SELECT 1 WHERE 0);
SELECT (SELECT * FROM (SELECT * FROM system.numbers LIMIT 2) WHERE number = number + 1);
SELECT (SELECT NULL WHERE 0);
SELECT (SELECT Null WHERE nuLL IS NOT NULL);
SELECT (SELECT Null WHERE 1);
SELECT CAST(NULL as Null);
SELECT (SELECT CAST(NULL as Null) WHERE 0);