def prefetch_cols(self):

        if not self.context.compiled:
            raise exc.InvalidRequestError(
                "Statement is not a compiled "
                "expression construct.")
        elif not self.context.isinsert and not self.context.isupdate:
            raise exc.InvalidRequestError(
                "Statement is not an insert() or update() "
                "expression construct.")
        return self.context.prefetch_cols
Parametric Risch Differential Equation - Special part of the denominator.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/engine/result.py/ResultProxy.prefetch_cols--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/integrals/prde.py/prde_special_denom