DROP TABLE IF EXISTS arraytest; set allow_deprecated_syntax_for_merge_tree=1; CREATE TABLE arraytest ( created_date Date DEFAULT toDate(created_at), created_at DateTime DEFAULT now(), strings Array(String) DEFAULT emptyArrayString()) ENGINE = MergeTree(created_date, cityHash64(created_at), (created_date, cityHash64(created_at)), 8192); INSERT INTO arraytest (created_at, strings) VALUES (now(), ['aaaaa', 'bbbbb', 'ccccc']); INSERT INTO arraytest (created_at, strings) VALUES (now(), ['aaaaa', 'bbbbb', null]); -- { clientError 349 } SELECT strings from arraytest; DROP TABLE IF EXISTS arraytest;