code: def test_nullable_schema_mismatch(tmpdir):
      # See: https://github.com/rapidsai/cudf/issues/12702
      path0 = str(tmpdir.join("test.0.parquet"))
      path1 = str(tmpdir.join("test.1.parquet"))
      cudf.DataFrame.from_dict({"a": [1, 2, 3]}).to_parquet(path0)
      cudf.DataFrame.from_dict({"a": [4, 5, None]}).to_parquet(path1)
      with dask.config.set({"dataframe.backend": "cudf"}):
          ddf = dd.read_parquet(
              [path0, path1], split_row_groups=2, aggregate_files=True
          )
          expect = pd.read_parquet([path0, path1])
      dd.assert_eq(ddf, expect, check_index=False)
  
imports: import glob
  import math
  import os
  import numpy
  import pandas
  import pytest
  import dask
  from dask import dataframe
  from dask.utils import natural_sort_key
  import cudf
  import dask_cudf
label_desc: Use image node_id 24 for calling a global function with example usage: test_nullable_schema_mismatch(tmpdir) without return types