code: def _is_uniform_reindex(join_units) -> bool:
      return (
          # TODO: should this be ju.block._can_hold_na?
          all(ju.block.is_extension for ju in join_units)
          and len({ju.block.dtype.name for ju in join_units}) == 1
      )
  
imports: from __future__ import annotations
  import copy
  import itertools
  from typing import TYPE_CHECKING, Sequence, cast
  import numpy
  from pandas._libs import NaT, internals
  from pandas._libs.missing import NA
  from pandas._typing import ArrayLike, AxisInt, DtypeObj, Manager, Shape
  from pandas.util._decorators import cache_readonly
  from pandas.core.dtypes.astype import astype_array
  from pandas.core.dtypes.cast import ensure_dtype_can_hold_na, find_common_type, np_find_common_type
  from pandas.core.dtypes.common import is_1d_only_ea_dtype, is_dtype_equal, is_scalar, needs_i8_conversion
  from pandas.core.dtypes.concat import concat_compat
  from pandas.core.dtypes.dtypes import DatetimeTZDtype, ExtensionDtype
  from pandas.core.dtypes.missing import is_valid_na_for_dtype, isna, isna_all
  import pandas.core.algorithms
  from pandas.core.arrays import DatetimeArray, ExtensionArray
  from pandas.core.arrays.sparse import SparseDtype
  from pandas.core.construction import ensure_wrapped_if_datetimelike
  from pandas.core.internals.array_manager import ArrayManager, NullArrayProxy
  from pandas.core.internals.blocks import ensure_block_shape, new_block_2d
  from pandas.core.internals.managers import BlockManager
label_desc: Use image node_id 11 for calling a global function with example usage: _is_uniform_reindex(join_units) and returns: unknown