tustvold commented on pull request #1617:
URL: 
https://github.com/apache/arrow-datafusion/pull/1617#issuecomment-1040101814


   I'm going to wait until after #1738 is merged and do some comparative 
investigation. Async is certainly not free as the block structure of parquet is 
not particularly amenable to streaming. Prior to merge I'd like a better handle 
on what the trade-offs here are, I'd expect memory usage to be higher, but 
performance may be better, not sure :smile: 


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