timsaucer opened a new pull request, #747:
URL: https://github.com/apache/datafusion-python/pull/747

   # Which issue does this PR close?
   
   Closes #730.
   
    # Rationale for this change
   
   The current fix is a work around for the `sum` function. We have hard coded 
it to use the aggregate sum function as the built in function is removed. With 
this change, we can remove all other built in window functions without having 
to similarly encode work arounds.
   
   # What changes are included in this PR?
   
   This change will add a search order to attempt to find the correct function, 
by first looking through all registered window functions, then registered 
aggregate functions, then default aggregate functions, and finally the built in 
window functions. 
   
   # Are there any user-facing changes?
   
   None.


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