docstr: Selecting a single column should not rebuild the spatial index.
code: def test_rebuild_on_single_col_selection(self):
      """Selecting a single column should not rebuild the spatial index."""
      # Selecting geometry column preserves the index
      original_index = self.df.sindex
      geometry_col = self.df["geom"]
      assert geometry_col.sindex is original_index
      geometry_col = self.df.geometry
      assert geometry_col.sindex is original_index
  
imports: from math import sqrt
  import numpy
  import pandas
  import pytest
  import shapely
  from numpy.testing import assert_array_equal
  from shapely.geometry import GeometryCollection, LineString, MultiPolygon, Point, Polygon, box
  import geopandas
  from geopandas import GeoDataFrame, GeoSeries, read_file
  from geopandas import _compat
label_desc: Use image node_id 6 for calling the TestFrameSindex obj's underlying member method code with example usage: obj.test_rebuild_on_single_col_selection() without return types