lidavidm commented on pull request #10070:
URL: https://github.com/apache/arrow/pull/10070#issuecomment-821409962


   Sorry, so this was originally added to support _writing_ data from a 
generator - which could be something like a Flight stream (=record batch 
reader). But writing data in Datasets consumes a scanner, so you end up having 
to support one-shot datasets. I agree supporting _reading_ data from Flight is 
an entirely different manner and would be modeled differently (presumably, as 
an iterable, as you suggest, corresponding to an RPC with a fixed set of 
parameters).


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