ozankabak commented on PR #7180:
URL: 
https://github.com/apache/arrow-datafusion/pull/7180#issuecomment-1669647841

   > I'd like to emphasize that there are still regressions with this approach. 
In fact in case of larger files (> 1GB) with K in 1000-8000 range, the runtime 
seems to be hit the most, with probably negligible memory improvements (if 
any). Anecdotally, the original file I've been testing does now show 
considerable speedup though, but that is perhaps not a typical file size 
(146M). So it's a mixed bag really, and I'm not sure it's best for this to be 
merged as is.
   
   I agree. A lot of us are thinking about solving the "top K" problem these 
days, I feel we should be able to find a solution that will achieve desirable 
results without the regressions.


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