def set_alternative(self, identity, test_name, alternative):
        raise Exception('Not implemented. Use a sub-class of ResultStorage')
A lazy loaded reference to the table metadata for the DB.
dataset/ETHPy150Open dcrosta/dabble/dabble/__init__.py/ResultStorage.set_alternative--crossover with--dataset/ETHPy150Open yhat/db.py/db/db.py/DB.tables