It seems MaterializeMySQL doesn't support Decimal data type when doing replication.
{
        UNKNOW_EVENT = 0,
        START_EVENT_V3 = 1,
        QUERY_EVENT = 2,
        STOP_EVENT = 3,
        ROTATE_EVENT = 4,
        INT_VAR_EVENT = 5,
        LOAD_EVENT = 6,
        SLAVE_EVENT = 7,
        CREATE_FILE_EVENT = 8,
        APPEND_BLOCK_EVENT = 9,
        EXEC_LOAD_EVENT = 10,
        DELETE_FILE_EVENT = 11,
        NEW_LOAD_EVENT = 12,
        RAND_EVENT = 13,
        USER_VAR_EVENT = 14,
        FORMAT_DESCRIPTION_EVENT = 15,
        XID_EVENT = 16,
        BEGIN_LOAD_QUERY_EVENT = 17,
        EXECUTE_LOAD_QUERY_EVENT = 18,
        TABLE_MAP_EVENT = 19,
        WRITE_ROWS_EVENT_V0 = 20,
        UPDATE_ROWS_EVENT_V0 = 21,