code: def engine(request):
      if request.param == "pyarrow":
          pytest.importorskip("pyarrow.json")
      return request.param
  
imports: from collections.abc import Iterator
  from io import StringIO
  from pathlib import Path
  import numpy
  import pytest
  import pandas
  from pandas import DataFrame, read_json
  import pandas._testing
  from pandas.io.json._json import JsonReader
label_desc: Use image node_id 2 for calling a global function with example usage: engine(request) and returns: request