code: def add(i, j):
      return i + j
  
imports: import datetime
  import decimal
  import pytz
  from pyflink.common import Row
  from pyflink.table import DataTypes
  from pyflink.table.tests.test_udf import SubtractOne
  from pyflink.table.udf import udf
  from pyflink.testing import source_sink_utils
  from pyflink.testing.test_case_utils import PyFlinkBatchTableTestCase, PyFlinkStreamTableTestCase, PyFlinkTestCase
label_desc: Use image node_id 1 for calling a global function with example usage: add(i, j) and returns: unknown