columns->columns- >children.emplace_back(create_materialized_column_declaration(“_sign”, "Int8", UInt64(1))); columns->columns- >children.emplace_back(create_materialized_column_declaration(“_version” MaterializeMySQL Database Engine CREATE TABLE test.test_table (`primary_key` int, value varchar(20), _sign Int8 DEFAULT 1, _version UInt64 DEFAULT 1) ENGINE = ReplacingMergeTree(_version) PARTITION BY intDiv(`primary_key`