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


   This is an awesome PR...one question for clarification...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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