AssHero opened a new pull request, #2634:
URL: https://github.com/apache/arrow-datafusion/pull/2634

   # Which issue does this PR close?
   
   Closes #2542 
   
    # Rationale for this change
   if the columns in window exprs are not referenced by operator, we can remove 
the window exprs.
   
   # What changes are included in this PR?
   remove the window exprs in projection_push_down.rs
   


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