alamb commented on issue #9146:
URL: 
https://github.com/apache/arrow-datafusion/issues/9146#issuecomment-1932036751

   @mustafasrepo  noted that 
   
   > currently optimize_projections rule doesn't have support for user defined 
nodes. When plan encounters a user defined node, currently we do not prune any 
field below it. However, I think we should have this support as demonstrated by 
your use case.
   
   I believe this is one usecase that @berkaysynnada  is planning to address 
via https://github.com/apache/arrow-datafusion/issues/9111 


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