code: def __init__(self):
      self.counter = None
      self.counter_sum = 0
  
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 to create a new MaxAdd object from inherited base classes: AggregateFunction with example: obj = MaxAdd()