code: def ddf_left_double(df_left):
      return dd.from_pandas(df_left, npartitions=2, sort=False)
  
file_path: distributed/distributed/shuffle/tests/test_merge_column_and_index.py
imports: from __future__ import annotations
  import pytest
  import pandas
  import dask
  from dask.dataframe.utils import assert_eq
  from distributed.shuffle import HashJoinP2PLayer, P2PShuffleLayer
  from distributed.utils_test import gen_cluster
label_desc: Use image node_id 10 for calling a global function with example usage: ddf_left_double(df_left) and returns: dd