novemberkilo commented on pull request #922:
URL: https://github.com/apache/arrow-datafusion/pull/922#issuecomment-917565774


   Thanks much @alamb 
   
   I followed your suggestion and set both of those constants to `0.0` and 
confirmed that the code path that is being hit is the one where 
`array.is_valid()` is skipped. I reran the benchmarks and still have no 
appreciable difference to report between my code and what is on `master`
   
   This is confusing to me ... perhaps the `is_valid()` call is not as 
expensive as we thought? Or else the optimisation is still somehow not visible. 
I'll think about it some more but thought I would post these findings as an 
interim update.


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