sunchao commented on PR #56227:
URL: https://github.com/apache/spark/pull/56227#issuecomment-4628017637

   Thanks for the review!
   
   > The `Slice` foldability guard is inconsistent between the two files ...
   
   Updated the PR to add matching `start.foldable && length.foldable` guard to 
the `Slice`
   case in `ProjectionOverSchema` to keep it aligned with `SelectedField` and 
the
   adjacent `ElementAt` handling.
   
   > `ProjectionOverLambdaVariable.project` still uses `semanticEquals` ...
   
   The current head already matches lambda variables by `exprId`
   in `ProjectionOverLambdaVariable.project`, so no additional change is needed
   there.
   
   > `projectArrayHigherOrderFunction` now relies ..
   
   I left the reference-identity check as-is since it directly follows from
   `projectedArguments`: only the retyped element variables are copied, while 
the
   remaining arguments retain their original instances.


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