code: def merge_unpack(
      shuffle_id_left: ShuffleId,
      shuffle_id_right: ShuffleId,
      output_partition: int,
      barrier_left: int,
      barrier_right: int,
      how: MergeHow,
      left_on: IndexLabel,
      right_on: IndexLabel,
      result_meta: pd.DataFrame,
      suffixes: Suffixes,
      left_index: bool,
      right_index: bool,
  ):
      from dask.dataframe.multi import merge_chunk
  
      ext = get_worker_plugin()
      # If the partition is empty, it doesn't contain the hash column name
      left = ext.get_output_partition(
          shuffle_id_left, barrier_left, output_partition
      ).drop(columns=_HASH_COLUMN_NAME, errors="ignore")
      right = ext.get_output_partition(
          shuffle_id_right, barrier_right, output_partition
      ).drop(columns=_HASH_COLUMN_NAME, errors="ignore")
      return merge_chunk(
          left,
          right,
          how=how,
          result_meta=result_meta,
          left_on=left_on,
          right_on=right_on,
          suffixes=suffixes,
          left_index=left_index,
          right_index=right_index,
      )
  
imports: from __future__ import annotations
  from collections.abc import Iterable, Sequence
  from typing import TYPE_CHECKING, Any
  import dask
  from dask.base import is_dask_collection, tokenize
  from dask.highlevelgraph import HighLevelGraph
  from dask.layers import Layer
  from distributed.shuffle._arrow import check_minimal_arrow_version
  from distributed.shuffle._core import ShuffleId, barrier_key, get_worker_plugin
  from distributed.shuffle._shuffle import shuffle_barrier, shuffle_transfer
label_desc: Use image node_id 5 for calling a global function with example usage: merge_unpack(shuffle_id_left, shuffle_id_right, output_partition, barrier_left, barrier_right, how, left_on, right_on, result_meta, suffixes, left_index, right_index) and returns: merge_chunk