lidavidm commented on pull request #9656:
URL: https://github.com/apache/arrow/pull/9656#issuecomment-827055257


   Coalescing does hurt local file performance. So it'll have to be a 
parameter, not enabled by default (and maybe we should consider how to detect 
and automatically enable it for high-latency filesystems).
   
   ![Local Median Scan Time 
(seconds)(1)](https://user-images.githubusercontent.com/327919/116132614-bd3d8780-a69b-11eb-9f88-1268dc0ec4da.png)
   


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