ehenry2 commented on pull request #811:
URL: https://github.com/apache/arrow-datafusion/pull/811#issuecomment-899683040


   This is an awesome PR...one question though...should the object reader trait 
have all its functions return Result? Remote storage systems have the wonderful 
feature of potentially having IO errors at any moment (as the request is being 
made over the wire) so even innocuous functions like length() have the 
potential to fail. I'm viewing this from the lens of S3, as I'd assuming a 
length() request would involve a head_object request or such to the s3 api, or 
should that info be pre-populated when the ObjectReader is instantiated? 


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