lidavidm commented on pull request #9656:
URL: https://github.com/apache/arrow/pull/9656#issuecomment-826871205


   By adding coalescing from #10145 we get a significant speedup with > 1 file. 
The 1-file case is slower but still better than the current implementation. 
(It's also possible other things have changed in the meantime.)
   
   ![S3 Median Scan Time 
(seconds)(5)](https://user-images.githubusercontent.com/327919/116097491-2f9c7080-a678-11eb-9218-40bdd36347b9.png)
   


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