DROP TABLE IF EXISTS null_subcolumns; SELECT 'Nullable'; CREATE TABLE null_subcolumns (id UInt32, n Nullable(String)) ENGINE = MergeTree ORDER BY id; INSERT INTO null_subcolumns VALUES (1, 'foo') (2, NULL) (3, NULL) (4, 'abc'); SELECT count() FROM null_subcolumns WHERE n.null; SELECT count() FROM null_subcolumns PREWHERE n.null; -- Check, that subcolumns will be available after restart. DETACH TABLE null_subcolumns; ATTACH TABLE null_subcolumns; SELECT count() FROM null_subcolumns WHERE n.null; SELECT count() FROM null_subcolumns PREWHERE n.null; DROP TABLE null_subcolumns; DROP TABLE IF EXISTS map_subcolumns; SELECT 'Map'; SET allow_experimental_map_type = 1; CREATE TABLE map_subcolumns (id UInt32, m Map(String, UInt32)) ENGINE = MergeTree ORDER BY id; INSERT INTO map_subcolumns VALUES (1, map('a', 1, 'b', 2)) (2, map('a', 3, 'c', 4)), (3, map('b', 5, 'c', 6, 'd', 7)); SELECT count() FROM map_subcolumns WHERE has(m.keys, 'a'); SELECT count() FROM map_subcolumns PREWHERE has(m.keys, 'b'); SELECT count() FROM map_subcolumns WHERE arrayMax(m.values) > 3; SELECT count() FROM map_subcolumns PREWHERE arrayMax(m.values) > 3; DETACH TABLE map_subcolumns; ATTACH TABLE map_subcolumns; SELECT count() FROM map_subcolumns WHERE has(m.keys, 'a'); SELECT count() FROM map_subcolumns PREWHERE has(m.keys, 'b'); SELECT id, m.size0 FROM map_subcolumns; SELECT count() FROM map_subcolumns WHERE m.size0 > 2; DROP TABLE map_subcolumns;