kszucs commented on pull request #7073:
URL: https://github.com/apache/arrow/pull/7073#issuecomment-622333391


   > * Simplified FileSystemDataset to hold a FragmentVector. Each Fragment 
must be a FileFragment and is checked at `FileSystemDataset::Make`.  Fragments 
are not required to use the same backing filesystem nor the same format.
   
   This makes me wonder, why do we need FileSystemDataset and/or UnionDataset 
at all? Because all of the filesystem and format specific logic is implemented 
by the discovery objects? 
   
   It implies that we could define dataset as a vector of arbitrary fragments.
   


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