ajantha-bhat edited a comment on pull request #3999:
URL: https://github.com/apache/carbondata/pull/3999#issuecomment-720258234


   @shenjiayu17  & @marchpure @QiangCai : **Have you analyzed which exact 
change is responsible for performance improvement?**  I don't think it is 
because of listFiles changes as it will make difference only if stale files are 
present. Probably writing as a new segment. But still, I don't get why this 
much difference,
   
   I think you have enabled horizontal compaction, now there is no horizontal 
compaction. You cannot call it as improvement as the query will slow down due 
to many segments and actual compaction need to run. 


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