bkietz commented on pull request #7073:
URL: https://github.com/apache/arrow/pull/7073#issuecomment-622364855


   WRT convenient single format or single file system datasets, it would be 
straightforward (and possibly more useful) to provide accessories for subsets, 
Dataset.subsets(by_format=True): { format: subset ... } Or similar. IMHO the 
convenience added does not justify a whole class, at least in C++. As you noted 
even if we remove it in C++ it could still be a convenience subclass in Python


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