SET join_algorithm = 'partial_merge'; SET max_bytes_in_join = '100'; CREATE TABLE foo_lc (n LowCardinality(String)) ENGINE = Memory; CREATE TABLE foo (n String) ENGINE = Memory; INSERT INTO foo SELECT toString(number) AS n FROM system.numbers LIMIT 1025; INSERT INTO foo_lc SELECT toString(number) AS n FROM system.numbers LIMIT 1025; SELECT 1025 == count(n) FROM foo_lc AS t1 ANY LEFT JOIN foo_lc AS t2 ON t1.n == t2.n; SELECT 1025 == count(n) FROM foo AS t1 ANY LEFT JOIN foo_lc AS t2 ON t1.n == t2.n; SELECT 1025 == count(n) FROM foo_lc AS t1 ANY LEFT JOIN foo AS t2 ON t1.n == t2.n; SELECT 1025 == count(n) FROM foo_lc AS t1 ALL LEFT JOIN foo_lc AS t2 ON t1.n == t2.n; DROP TABLE foo; DROP TABLE foo_lc;