lidavidm commented on pull request #10376:
URL: https://github.com/apache/arrow/pull/10376#issuecomment-846219969


   Hmm. It's unclear if there's an improvement. Nominally there is compared to 
the contender but it seems the contender was just slow. I was hoping the 
pre_buffer=true would be faster than the pre_buffer=false within the same run.
   
   
![image](https://user-images.githubusercontent.com/327919/119191665-f542ab00-ba4c-11eb-8b41-a899fb4c4b6c.png)
   


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