pitrou commented on PR #13635:
URL: https://github.com/apache/arrow/pull/13635#issuecomment-1192655477

   The StopToken will only work if it is actually polled by the implementation. 
I'm not sure the dataset layer does that. @westonpace 
   
   Also, the CSV does use the IOContext's StopToken:
   
https://github.com/apache/arrow/blob/010b5921bd33e9849820f981647561f19936b899/cpp/src/arrow/csv/reader.cc#L992-L993
   


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