def _query_clause_element(self):

        return self.comparator._query_clause_element()
Tests that new keys are not duplicated and non-existant columns.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py/QueryableAttribute._query_clause_element--crossover with--dataset/ETHPy150Open google/textfsm/clitable_test.py/UnitTestCliTable.testAddKey