create table if not exists whitespaces engine = MergeTree() partition by tuple() order by tuple() as with 32 - log2(intHash32(number)) + 1 as num_spaces, repeat(' ', toUInt32(num_spaces)) as spaces select spaces || toString(number) || spaces value from numbers_mt(100000000); 30000 func trimLeft(value) trimRight(value) trimBoth(value) func_slow replaceRegexpOne(value, '^ *', '') replaceRegexpOne(value, ' *$', '') replaceRegexpAll(value, '^ *| *$', '') SELECT {func} FROM whitespaces FORMAT Null SELECT {func_slow} FROM whitespaces LIMIT 10000000 FORMAT Null DROP TABLE IF EXISTS whitespaces