code: def test_chunked_round_trip() -> None:
      df1 = pl.DataFrame(
          {
              "a": [1] * 2,
              "l": [[1] for j in range(2)],
          }
      )
      df2 = pl.DataFrame(
          {
              "a": [2] * 3,
              "l": [[2] for j in range(3)],
          }
      )
  
      df = df1.vstack(df2)
  
      f = io.BytesIO()
      df.write_parquet(f)
      f.seek(0)
      assert_frame_equal(pl.read_parquet(f), df)
  
imports: from __future__ import annotations
  import io
  from datetime import datetime, time, timezone
  from decimal import Decimal
  from typing import TYPE_CHECKING
  import numpy
  import pandas
  import pyarrow
  import pyarrow.dataset
  import pyarrow.parquet
  import pytest
  import polars
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 13 for calling a global function with example usage: test_chunked_round_trip() without return types