Yizhou-Yang commented on PR #11651:
URL: https://github.com/apache/gluten/pull/11651#issuecomment-4037340387

   > @Yizhou-Yang Thanks for your implementation! Recently I am cherrying pick 
your PR and I find that the KLL implementation in Gluten has only one level and 
discards items in odd position when compacting. I am wondering if this 
implementation can meet the `accuracy` requirement. Will the relative error 
rate be too high?
   
   yes, this is part of the reason for the ut failures. The gluten version of 
kll is written rather hastily and was primarily concerned with simplicity and 
fallback compatibiltity with velox, and now it seems to have caused problems 
including but not limited to ut failures and lots of off-by-one issues. I am 
editing this implementation and doing a line-by-line comparison with the velox 
one to ensure the gluten side quality, although still some existing uts might 
need to be excluded.


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