def get_column_name(self, index):

        model, new_index = self._resolve_column_index(index)

        return model.get_column_name(new_index)
Testing the `extent` GeoQuerySet method.
dataset/ETHPy150Open enthought/pyface/pyface/ui/wx/grid/composite_grid_model.py/CompositeGridModel.get_column_name--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/gis/tests/geoapp/tests.py/GeoQuerySetTest.test_extent