code: def test_set_index():
      df1 = pd.DataFrame(
          [[1, 3, 3], [4, 2, 6], [7, 8, 9]],
          index=["a1", "a2", "a3"],
          columns=["x", "y", "z"],
      )
      df2 = md.DataFrame(df1, chunk_size=2)
  
      df3 = df2.set_index("y", drop=True)
      df3 = tile(df3)
      assert df3.chunk_shape == (2, 2)
      pd.testing.assert_index_equal(
          df3.chunks[0].columns_value.to_pandas(), pd.Index(["x"])
      )
      pd.testing.assert_index_equal(
          df3.chunks[1].columns_value.to_pandas(), pd.Index(["z"])
      )
  
      df4 = df2.set_index("y", drop=False)
      df4 = tile(df4)
      assert df4.chunk_shape == (2, 2)
      pd.testing.assert_index_equal(
          df4.chunks[0].columns_value.to_pandas(), pd.Index(["x", "y"])
      )
      pd.testing.assert_index_equal(
          df4.chunks[1].columns_value.to_pandas(), pd.Index(["z"])
      )
  
imports: import numpy
  import pandas
  import pytest
  from ....None import dataframe
  from ....None import tensor
  from ....core import tile
  from ....tensor.core import TENSOR_CHUNK_TYPE, TENSOR_TYPE, Tensor
  from ...core import SERIES_CHUNK_TYPE, SERIES_TYPE, Series, DATAFRAME_TYPE, DataFrame, DATAFRAME_CHUNK_TYPE
  from ...datasource.from_tensor import dataframe_from_tensor
  from ..iloc import DataFrameIlocGetItem, DataFrameIlocSetItem, IndexingError, HeadTailOptimizedOperandMixin
  from ..loc import DataFrameLocGetItem
label_desc: Use image node_id 1 for calling a global function with example usage: test_set_index() without return types