yahoNanJing commented on PR #2906:
URL: 
https://github.com/apache/arrow-datafusion/pull/2906#issuecomment-1184369507

   Thanks @alamb for your comments.
   
   > Is the primary usecase "lazy" object store registration? Namely that the 
relevant ObjectStore instance isn't instantiated unless a URL in a plan 
requires it?
   
   Yes. By self-registration, we can achieve the "lazy" registration.
   
   > I thought the way Ballista (or other systems) would work would be that:
   
   For the ballista usage, it's necessary for us to introduce the object store 
extensions as optional features. The detailed usage way may differ for 
different object stores. For example,
   - For S3, we need to introduce additional configurations, like bucket, 
credential info, etc.
   - For HDFS, related configurations can be found in some specific locations. 
Therefore, we don't need to do any additional configurations. 
   
   
   


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