[BUG] PyHive SQLAlchemy reflection problem

> NotImplementedError: Operator 'getitem' ...

After

```python
Base = declarative_base()
Base.query = session.query_property()
meta = MetaData(bind=engine)

class XX(Base):
__tablename__ "test"
__table__ = meta.tables(__tablename__)
__mapper_args__ = [__table__.c.id, ]
```

, an error was caused for reason 'NotImplementedError: Operator 'getitem' xx"