Converts the row filter to a protobuf.

        First converts to a :class:`.data_v2_pb2.ValueRange` and then uses
        it to create a row filter protobuf.

        :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.ValueRange` and then uses
        it to create a row filter protobuf.

        :rtype: :class:`.data_v2_pb2.RowFilter`
        :returns: The converted current object.
        """
        value_range_kwargs = {}
        if self.start_value is not None:
            if self.inclusive_start:
                key = "start_value_closed"
            else:
                key = "start_value_open"
            value_range_kwargs[key] = _to_bytes(self.start_value)
        if self.end_value is not None:
            if self.inclusive_end:
                key = "end_value_closed"
            else:
                key = "end_value_open"
            value_range_kwargs[key] = _to_bytes(self.end_value)

        value_range = data_v2_pb2.ValueRange(**value_range_kwargs)
        return data_v2_pb2.RowFilter(value_range_filter=value_range)