jhorstmann opened a new pull request #998:
URL: https://github.com/apache/arrow-rs/pull/998


   # Which issue does this PR close?
   
   Closes #997.
   
   Draft for now since I still have to update the code comments and maybe add 
some more tests.
   
   # Are there any user-facing changes?
   
   I haven't run any benchmarks yet but this should improve performance of 
window functions with high-cardinality partition-by in datafusion.


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