如何在强制转换操作中包装一个列?

I have an MSSQL database with tables which I cannot change and only ever interact with it as read only (SELECT statements). I am using sqlalchemy. What I need to do is to automatically wrap specific columns in CAST() SQL operations for every query. I want to do this at a low level so my code never needs to think about the problem. The reason I am doing this is explained in I have an MSSQL database with tables which I ca