DROP TABLE IF EXISTS table2;
CREATE TABLE table2
(
        EventDate Date,
        Id Int32,
        Value Int32
)
Engine = MergeTree()
PARTITION BY toYYYYMM(EventDate)
ORDER BY Id;

ALTER TABLE table2 MODIFY COLUMN `Value` DEFAULT 'some_string'; --{serverError CANNOT_PARSE_TEXT}

ALTER TABLE table2 ADD COLUMN `Value2` DEFAULT 'some_string'; --{serverError BAD_ARGUMENTS}

DROP TABLE IF EXISTS table2;