code: def setUpClass(cls):
      super(PythonUDFArrowTests, cls).setUpClass()
      cls.spark.conf.set(
          "spark.sql.execution.pythonUDF.arrow.enabled", "true"
      )
  
imports: import unittest
  from pyspark.errors import PythonException, PySparkNotImplementedError
  from pyspark.sql import Row
  from pyspark.sql.functions import udf
  from pyspark.sql.tests.test_udf import BaseUDFTestsMixin
  from pyspark.sql.types import VarcharType
  from pyspark.testing.sqlutils import have_pandas, have_pyarrow, pandas_requirement_message, pyarrow_requirement_message, ReusedSQLTestCase
  from pyspark.rdd import PythonEvalType
label_desc: Use image node_id 1 for calling the PythonUDFArrowTests obj's underlying member method code with example usage: obj.setUpClass(cls) without return types