def AddColumn(self, cf, qu):
        """ 添加期望读取的Column
        默认读取一行(row)的全部Column(ColumnFamily + Qualifier)

        Args:
            cf(string): 期望读取的ColumnFamily
            qu(string): 期望读取的Qualifier
        """
        lib.tera_row_reader_add_column(self.reader, cf, qu, c_uint64(len(qu)))