Converts the row filter to a protobuf.

        First converts to a :class:`.data_v2_pb2.ColumnRange` and then uses it
        in the ``column_range_filter`` field.

        :rtype: :class:`.data_v2_pb2.RowFilter`
        :returns: The converted current object.

def to_pb(self):
        """Converts the row filter to a protobuf.

        First converts to a :class:`.data_v2_pb2.ColumnRange` and then uses it
        in the ``column_range_filter`` field.

        :rtype: :class:`.data_v2_pb2.RowFilter`
        :returns: The converted current object.
        """
        column_range_kwargs = {"family_name": self.column_family_id}
        if self.start_column is not None:
            if self.inclusive_start:
                key = "start_qualifier_closed"
            else:
                key = "start_qualifier_open"
            column_range_kwargs[key] = _to_bytes(self.start_column)
        if self.end_column is not None:
            if self.inclusive_end:
                key = "end_qualifier_closed"
            else:
                key = "end_qualifier_open"
            column_range_kwargs[key] = _to_bytes(self.end_column)

        column_range = data_v2_pb2.ColumnRange(**column_range_kwargs)
        return data_v2_pb2.RowFilter(column_range_filter=column_range)