code: def test_apply_explicitly_infer(self):
      # SPARK-39317
      from pyspark.pandas.utils import SPARK_CONF_ARROW_ENABLED
  
      def plus_min(x):
          return x + x.min()
  
      with self.sql_conf({SPARK_CONF_ARROW_ENABLED: False}):
          df = ps.DataFrame(
              {"A": ["a", "a", "b"], "B": [1, 2, 3]}, columns=["A", "B"]
          )
          g = df.groupby("A")
          g.apply(plus_min).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 12 for calling the GroupbyApplyFuncMixin obj's underlying member method code with example usage: obj.test_apply_explicitly_infer() and returns: unknown