code: def join_t(other, join_type):
      
      return Transformation(
          '{0}_join'.format(join_type),
          partial(join_impl, other, join_type),
          None
      )
docs: Transformation for Sequence.join, Sequence.inner_join, Sequence.outer_join, Sequence.right_join,
      and Sequence.left_join
      :param other: other sequence to join with
      :param join_type: join type from left, right, inner, and outer
      :return: transformation