code: def emit_value(self, accumulator):
      accumulator.sort()
      accumulator.reverse()
      size = len(accumulator)
      if size > 1:
          yield accumulator[0]
      if size > 2:
          yield accumulator[1]
  
imports: import unittest
  from pandas.testing import assert_frame_equal
  from pyflink.common import Row
  from pyflink.table import expressions, ListView
  from pyflink.table.types import DataTypes
  from pyflink.table.udf import udf, udtf, udaf, AggregateFunction, TableAggregateFunction, udtaf
  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 Top2 obj's underlying member method code with example usage: obj.emit_value(accumulator) without return types