def DeleteColumn(self, cf, qu):
        """ 删除这一行上
            ColumnFamily为<cf>, Qualifier为<qu>的cell

        Args:
            cf(string): ColumnFamily名
            qu(string): Qualifier名
        """
        lib.tera_row_mutation_delete_column(self.mutation, cf,
                                            qu, c_uint64(len(qu)))