@classmethod
    def type_descriptor(cls, typeobj):

        raise NotImplementedError()
Validates argument values and checks if the function requires a
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/engine/interfaces.py/Dialect.type_descriptor--crossover with--dataset/ETHPy150Open stepank/pyws/src/pyws/functions/__init__.py/Function.__call__