cloud-fan commented on PR #39754:
URL: https://github.com/apache/spark/pull/39754#issuecomment-2597445582

   I'm thinking about this again but still not comfortable with this 
`ScopedExpression` approach, given it relies on rule execution order.
   
   I have a new idea: how about we add a special annotation to the columns 
produced by `groupByKey`? It can be a special key in 
`AttributeRefererence#metadata`, and column resolution will skip it when 
resolving column names.


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