tanelk commented on pull request #31907:
URL: https://github.com/apache/spark/pull/31907#issuecomment-803459084


   Reordering the optimizers seems like a bit of a band-aid fix. 
   If I'm not mistaken the issue is similar to the one I tried to fix in 
#31677. The `CollapseWindow` rule did not work with `Project` nodes between 
windows. It seems, that the `TransposeWindow` has a similar problem.
   
   @cloud-fan did comment 
(https://github.com/apache/spark/pull/31677#issuecomment-800894675), that 
perhaps we should merge `Project` and `Window` nodes. But that seems like a 
major refacto of everything related to the logical `Window` nodes.


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