zhengruifeng commented on PR #38768:
URL: https://github.com/apache/spark/pull/38768#issuecomment-1324694898

   I think it is time to refactor `Column` to something like:
   
   ```
   class Column:
   
       def __init__(self, expr: Expression) -> None:
           self.expr = expr
       ...
   ```
   
   we'd better try to match the API shape at first, otherwise it will be hard 
to do so after we make it more complicated.
   
   cc @HyukjinKwon 


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