Jimexist opened a new issue #371:
URL: https://github.com/apache/arrow-datafusion/issues/371


   👍 
   
   Eventually it would be cool to push the partitioning expressions into a 
`RepartitionExec` so that we can execute the window functions in parallel on 
different windows but that is definitely an optimization for the future (not 
this initial PR) :)
   
   _Originally posted by @alamb in 
https://github.com/apache/arrow-datafusion/pull/334#discussion_r636118198_


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