555aaditya commented on PR #55297:
URL: https://github.com/apache/arrow/pull/55297#issuecomment-6465258187

   For context: #51543 tried to fix this earlier and was closed. This PR takes 
a slightly different route. Instead of keeping the merged generator and forcing 
it to one subscription, it uses the concatenated generator for 
`fragment_readahead <= 1` on both paths, which is what the sequenced path has 
done since GH-15264. I reproduced the hang locally, checked that both new tests 
hang without the fix, and also checked empty and multi-file datasets with 
`use_threads` on and off.
   


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