code: def identity(x):
      if x is not None:
          from pyflink.common import Row
  
          return Row(x)
  
imports: import unittest
  from pyflink.table import DataTypes
  from pyflink.table.udf import TableFunction, udtf, ScalarFunction, udf
  from pyflink.table.expressions import col
  from pyflink.testing import source_sink_utils
  from pyflink.testing.test_case_utils import PyFlinkStreamTableTestCase, PyFlinkBatchTableTestCase
label_desc: Use image node_id 1 for calling a global function with example usage: identity(x) and returns: Row