code: def is_uniform_join_units(join_units):
      
      return (
          # all blocks need to have the same type
          all(type(ju.block) is type(join_units[0].block) for ju in join_units) and  # noqa
          # no blocks that would get missing values (can lead to type upcasts)
          # unless we're an extension dtype.
          all(not ju.is_na or ju.block.is_extension for ju in join_units) and
          # no blocks with indexers (as then the dimensions do not fit)
          all(not ju.indexers for ju in join_units) and
          # disregard Panels
          all(ju.block.ndim <= 2 for ju in join_units) and
          # only use this path when there is something to concatenate
          len(join_units) > 1)
docs: Check if the join units consist of blocks of uniform type that can
      be concatenated using Block.concat_same_type instead of the generic
      concatenate_join_units (which uses `_concat._concat_compat`).