once 1000 10000 SELECT count() FROM system.numbers WHERE NOT ignore(rand() % 2 ? 'hello' : 'world') SELECT count() FROM system.numbers WHERE NOT ignore(rand() % 2 ? 'hello' : '') SELECT count() FROM system.numbers WHERE NOT ignore(rand() % 2 ? toFixedString('hello', 5) : toFixedString('world', 5)) SELECT count() FROM system.numbers WHERE NOT ignore(rand() % 2 ? '' : toFixedString('world', 5))