DROP TABLE IF EXISTS t1;
DROP TABLE IF EXISTS t2;

CREATE table t1 (a UInt64, b UInt64) ENGINE = Memory;
INSERT INTO t1 SELECT number % 2, number FROM numbers(10);

CREATE table t2 (a UInt64) ENGINE = Memory;

INSERT INTO t2 SELECT number % 2 FROM numbers(10);

-- block size is always multiple of 5 because we have 5 rows for each key in right table
-- we do not split rows corresponding to the same key

SELECT max(bs) <= 5, b FROM (
    SELECT blockSize() as bs, * FROM t1 JOIN t2 ON t1.a = t2.a
) GROUP BY b
ORDER BY b
SETTINGS max_joined_block_size_rows = 5;

SELECT '--';

SELECT max(bs) <= 10, b FROM (
    SELECT blockSize() as bs, * FROM t1 JOIN t2 ON t1.a = t2.a
) GROUP BY b
ORDER BY b
SETTINGS max_joined_block_size_rows = 10;

SELECT '--';

-- parallel_hash doen't support max_joined_block_size_rows

SET join_algorithm = 'parallel_hash';

SELECT max(bs) > 10, b FROM (
    SELECT blockSize() as bs, * FROM t1 JOIN t2 ON t1.a = t2.a
) GROUP BY b
ORDER BY b
SETTINGS max_joined_block_size_rows = 10;