code: def _check_csv_set_escape_char_results(test, results):
      row = results[0]
      test.assertEqual(row["string"], "string,")
      test.assertEqual(row["string2"], '"string2"')
  
imports: import glob
  import os
  import tempfile
  from typing import Tuple, List
  from pyflink.common import WatermarkStrategy, Types
  from pyflink.datastream import MapFunction
  from pyflink.datastream.connectors.file_system import FileSource, FileSink
  from pyflink.datastream.formats.csv import CsvSchema, CsvReaderFormat, CsvBulkWriters, CsvRowSerializationSchema, CsvRowDeserializationSchema
  from pyflink.datastream.tests.test_util import DataStreamTestSinkFunction
  from pyflink.java_gateway import get_gateway
  from pyflink.table import DataTypes
  from pyflink.testing.test_case_utils import PyFlinkStreamingTestCase, PyFlinkTestCase
  from pyflink.util.java_utils import get_j_env_configuration
label_desc: Use image node_id 16 for calling a global function with example usage: _check_csv_set_escape_char_results(test, results) without return types