code: def test_vstack_column_number_mismatch(df1: pl.DataFrame) -> None:
      df2 = df1.drop("ham")
  
      with pytest.raises(pl.ShapeError):
          df1.vstack(df2)
  
file_path: polars/py-polars/tests/unit/dataframe/test_vstack.py
imports: import pytest
  import polars
  from polars.testing import assert_frame_equal
label_desc: Use image node_id 7 for calling a global function with example usage: test_vstack_column_number_mismatch(df1) without return types