pitrou commented on pull request #12055:
URL: https://github.com/apache/arrow/pull/12055#issuecomment-1064384400


   @eelxpeng 
   > Verified the speed improvement on the 
[example](https://pastebin.com/pSkYHQn9) provided above. Thanks for the good 
work!
   
   Can you post the speed numbers you got?
   
   > I have one question, does the change revises the arrow file and saves 
necessary information in the file?
   
   No, it doesn't. It's all in memory.
   


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