alamb opened a new pull request, #10835:
URL: https://github.com/apache/datafusion/pull/10835

   ## Which issue does this PR close?
   
   Closes https://github.com/apache/datafusion/issues/9873
   
   Closes  https://github.com/apache/arrow-datafusion/issues/9637 -- the last 
one of my planned PRs to make DataFusion planning faster by not copying so much
   
   ## Rationale for this change
   For low latency use cases the overhead of planning can be substantial, 
especially for relatively complex plans
   
   ## What changes are included in this PR?
   
   1. rewrite `CommonSubexprEliminate` to avoid deep copying plans using 
TreeNode API
   
   
   ## Are these changes tested?
   Functioanlly by existing CI
   
   Performance tests : TBD
   
   
   
   ## Are there any user-facing changes?
   
   Performance Improvements (see above)
   


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