code: def test_get_chunks_from_col_chunks_even_chunks(
      allow_copy: bool,
  ) -> None:
      df1 = pl.DataFrame({"a": [1, 2], "b": [4, 5]})
      df2 = pl.DataFrame({"a": [3], "b": [6]})
      df = pl.concat([df1, df2], rechunk=False)
  
      dfi = PolarsDataFrame(df, allow_copy=allow_copy)
      out = dfi._get_chunks_from_col_chunks()
  
      chunk1 = next(out)
      assert_frame_equal(chunk1, df1)
  
      chunk2 = next(out)
      assert_frame_equal(chunk2, df2)
  
      with pytest.raises(StopIteration):
          next(out)
  
imports: from __future__ import annotations
  import pytest
  import polars
  from polars.interchange.dataframe import PolarsDataFrame
  from polars.interchange.protocol import CopyNotAllowedError
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 21 for calling a global function with example usage: test_get_chunks_from_col_chunks_even_chunks(allow_copy) without return types