code: def test_apply_key_handling(self):
      pdf = pd.DataFrame(
          {
              "d": [1.0, 1.0, 1.0, 2.0, 2.0, 2.0],
              "v": [1.0, 2.0, 3.0, 4.0, 5.0, 6.0],
          }
      )
      psdf = ps.from_pandas(pdf)
  
      self.assert_eq(
          psdf.groupby("d").apply(sum).sort_index(),
          pdf.groupby("d").apply(sum).sort_index(),
      )
  
      with ps.option_context("compute.shortcut_limit", 1):
          self.assert_eq(
              psdf.groupby("d").apply(sum).sort_index(),
              pdf.groupby("d").apply(sum).sort_index(),
          )
  
imports: import unittest
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.pandas.config import option_context
  from pyspark.testing.pandasutils import ComparisonTestBase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 8 for calling the GroupbyApplyFuncMixin obj's underlying member method code with example usage: obj.test_apply_key_handling() without return types