code: def setUpClass(cls):
      super(StreamPandasUDAFITTests, cls).setUpClass()
      cls.t_env.create_temporary_system_function("mean_udaf", mean_udaf)
      max_add_min_udaf = udaf(
          lambda a: a.max() + a.min(),
          result_type="SMALLINT",
          func_type="pandas",
      )
      cls.t_env.create_temporary_system_function(
          "max_add_min_udaf", max_add_min_udaf
      )
  
imports: import uuid
  from pyflink.table.expressions import col, call, lit, row_interval
  from pyflink.table.types import DataTypes
  from pyflink.table.udf import udaf, udf, AggregateFunction
  from pyflink.testing import source_sink_utils
  from pyflink.testing.test_case_utils import PyFlinkBatchTableTestCase, PyFlinkStreamTableTestCase
label_desc: Use image node_id 1 for calling the StreamPandasUDAFITTests obj's underlying member method code with example usage: obj.setUpClass(cls) without return types