DROP TABLE IF EXISTS t_01411; CREATE TABLE t_01411( str LowCardinality(String), arr Array(LowCardinality(String)) default [str] ) ENGINE = MergeTree() ORDER BY tuple(); INSERT INTO t_01411 (str) SELECT concat('asdf', toString(number % 10000)) FROM numbers(1000000); SELECT count() FROM t_01411 WHERE str = 'asdf337'; SELECT count() FROM t_01411 WHERE arr[1] = 'asdf337'; SELECT count() FROM t_01411 WHERE has(arr, 'asdf337'); SELECT count() FROM t_01411 WHERE indexOf(arr, 'asdf337') > 0; SELECT count() FROM t_01411 WHERE arr[1] = str; SELECT count() FROM t_01411 WHERE has(arr, str); SELECT count() FROM t_01411 WHERE indexOf(arr, str) > 0; DROP TABLE IF EXISTS t_01411; DROP TABLE IF EXISTS t_01411_num; CREATE TABLE t_01411_num( num UInt8, arr Array(LowCardinality(Int64)) default [num] ) ENGINE = MergeTree() ORDER BY tuple(); INSERT INTO t_01411_num (num) SELECT number % 1000 FROM numbers(1000000); SELECT count() FROM t_01411_num WHERE num = 42; SELECT count() FROM t_01411_num WHERE arr[1] = 42; SELECT count() FROM t_01411_num WHERE has(arr, 42); SELECT count() FROM t_01411_num WHERE indexOf(arr, 42) > 0; SELECT count() FROM t_01411_num WHERE arr[1] = num; SELECT count() FROM t_01411_num WHERE has(arr, num); SELECT count() FROM t_01411_num WHERE indexOf(arr, num) > 0; SELECT count() FROM t_01411_num WHERE indexOf(arr, num % 337) > 0; DROP TABLE IF EXISTS t_01411_num;