class_docstr: Tests whether the Python :class:`Expression` is consistent with
  Java `org.apache.flink.table.api.ApiExpression`.
code: def python_class(cls):
      return Expression
  
file_path: flink/flink-python/pyflink/table/tests/test_expression_completeness.py
imports: from pyflink.testing.test_case_utils import PythonAPICompletenessTestCase, PyFlinkTestCase
  from pyflink.table import Expression
label_desc: Use image node_id 1 for calling the ExpressionCompletenessTests obj's underlying member method code with example usage: obj.python_class(cls) and returns: Expression