westonpace commented on pull request #9482:
URL: https://github.com/apache/arrow/pull/9482#issuecomment-781586314


   So `PreBuffer` needs to be called once and only once on a reader?  It seems 
this could be simplified if `PreBuffer` didn't immediately start reading (and 
waited for the first request) although I suppose that may only push the flag 
further down.


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