gianm commented on issue #12887:
URL: https://github.com/apache/druid/issues/12887#issuecomment-1227953891

   My understanding agrees with @LakshSingla. It is an approximate algorithm 
that may return slightly different numbers. Nevertheless, all numbers returned 
by the algorithm fall within the expected error bounds. Like @LakshSingla 
mentioned you can raise `k` if you need tighter error bounds. It will improve 
accuracy, at the cost of using more memory and processing time.
   
   If you encounter further issues, please feel free to reopen this, or join us 
on Slack: https://druid.apache.org/community/


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