berkaysynnada commented on PR #8891:
URL: 
https://github.com/apache/arrow-datafusion/pull/8891#issuecomment-1932192763

   > @berkaysynnada, can you please ellaborate on the signature of the new 
`visit`/`rewrite` API you are proposing?
   
   I have not detailed the signatures yet but theoretically there is no 
difficulty for the calls, they could have very similar to your updated 
`visit()` and `rewrite()` implementations. Users can call visit() (or 
rewrite()) on their trees, and if they have implemented pre_visit() or 
post_visit(), they are applied accordingly. Otherwise, the calls simply return 
self with transformed::no and tnr::stop by default. In this way, we can 
eliminate also Visitor and Rewriter traits.


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