def _get_result_constructor(self):
        raise NotImplementedError
Validate string key value.
dataset/ETHPy150Open datastax/python-driver/cassandra/cqlengine/query.py/AbstractQuerySet._get_result_constructor--crossover with--dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/resource.py/_string