single inh criteria should be added for select_from()

in test_single:

    def test_select_from_inherited_tables(self):
        Manager, Engineer, Employee = (self.classes.Manager, self.classes.Engineer, self.classes.Employee)

        sess = create_session()
        m1 = Manager(name='Tom', manager_data='data1')
        e1 = Engineer(name='Kurt', engineer_info='knows how to hack')
        sess.add_all([m1, e1])
        sess.flush()

        eq_(
            sess.query(func.count(1)).select_from(Manager).all(),
            [(1, )]
        )

need to say func.count(Manager.employee_id) for now

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