HeartSaVioR commented on pull request #35362:
URL: https://github.com/apache/spark/pull/35362#issuecomment-1030927553


   
https://github.com/HeartSaVioR/spark/commit/d532b6f6bcdd80cdaac520b21587ebb69ff2df8f
   
   I just played with my own simple benchmark (in the commit above), and the 
gain is much more than the PR description. It's up to 30% for tumble window to 
60% for sliding window. (I expect the gain gets bigger if maxNumOverlapping is 
higher.)
   
   I'll update the PR description to contain the benchmark result.
   
   I also did some calculations based on the new math to create sliding windows 
with offset by hand, and it seemed OK. I can't think of cases the new math may 
miss.


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