loop CREATE TABLE IF NOT EXISTS whitespaces(value String) ENGINE = MergeTree() PARTITION BY tuple() ORDER BY tuple() INSERT INTO whitespaces SELECT value FROM (SELECT arrayStringConcat(groupArray(' ')) AS spaces, concat(spaces, toString(any(number)), spaces) AS value FROM numbers(100000000) GROUP BY pow(number, intHash32(number) % 4) % 12345678) 30000 func value trimLeft(value) trimRight(value) trimBoth(value) replaceRegexpOne(value, '^ *', '') replaceRegexpOne(value, ' *$', '') replaceRegexpAll(value, '^ *| *$', '') SELECT count() FROM whitespaces WHERE NOT ignore({func}) DROP TABLE IF EXISTS whitespaces