code: def test_dictionary(pickle_module):
      indices = pa.array([2, None, 1, 2, 0, None])
      dictionary = pa.array(["foo", "bar", "baz"])
  
      arr = pa.DictionaryArray.from_arrays(indices, dictionary)
      expected = ["baz", None, "bar", "baz", "foo", None]
      assert arr.to_pylist() == expected
  
      for j, (i, v) in enumerate(zip(indices, expected)):
          s = arr[j]
  
          assert s.as_py() == v
          assert s.value.as_py() == v
          assert s.index.equals(i)
          assert s.dictionary.equals(dictionary)
  
          restored = pickle_module.loads(pickle_module.dumps(s))
          assert restored.equals(s)
  
imports: import datetime
  import decimal
  import pytest
  import sys
  import weakref
  import numpy
  import pyarrow
  import pyarrow.compute
  from pyarrow.tests import util
label_desc: Use image node_id 39 for calling a global function with example usage: test_dictionary(pickle_module) without return types