SET transform_null_in = 1;

DROP TABLE IF EXISTS null_in_1;
CREATE TABLE null_in_1 (u UInt32, n Nullable(UInt32)) ENGINE = Memory;
INSERT INTO null_in_1 VALUES (1, NULL), (2, 2), (3, NULL), (4, 4), (5, NULL);

SELECT count() FROM null_in_1 WHERE n IN (1, 2, NULL);
SELECT count() FROM null_in_1 WHERE u IN (1, 2, NULL);
SELECT count() FROM null_in_1 WHERE (u, n) IN ((1, 2), (1, NULL), (2, 2));
SELECT count() FROM null_in_1 WHERE (u, n) IN ((NULL, NULL), (2, 2), (NULL, 2));
SELECT count() FROM null_in_1 WHERE (u, n) IN (42, NULL);
SELECT count() FROM null_in_1 WHERE (u, n) NOT IN ((3, NULL), (5, NULL));

SELECT '==============';
DROP TABLE IF EXISTS null_in_1;

CREATE TABLE null_in_1 (a Nullable(UInt32), b Nullable(UInt32)) ENGINE = Memory;
INSERT INTO null_in_1 VALUES (1, NULL) (0, NULL) (NULL, NULL) (NULL, 1) (NULL, 0) (0, 0) (1, 1);

SELECT count() FROM null_in_1 WHERE (a, b) IN (1, NULL);
SELECT count() FROM null_in_1 WHERE (a, b) IN (0, NULL);
SELECT count() FROM null_in_1 WHERE (a, b) IN (42, NULL);
SELECT count() FROM null_in_1 WHERE (a, b) IN (NULL, 0);
SELECT count() FROM null_in_1 WHERE (a, b) IN (NULL, 1);
SELECT count() FROM null_in_1 WHERE (a, b) IN (NULL, 42);
SELECT count() FROM null_in_1 WHERE (a, b) IN (NULL, NULL);
SELECT count() FROM null_in_1 WHERE (a, b) IN (0, 0);
SELECT count() FROM null_in_1 WHERE (a, b) IN (1, 1);
SELECT count() FROM null_in_1 WHERE (a, b) IN (1, 42);

DROP TABLE IF EXISTS null_in_1;