AlexanderSaydakov commented on issue #7269: Replace Datasketch HLL with newer 
Datasketch CPC sketch
URL: 
https://github.com/apache/incubator-druid/issues/7269#issuecomment-473430364
 
 
   We are working on the documentation. It is a new algorithm that beats HLL in 
terms of accuracy per byte (more compact (when serialized) with the same 
accuracy or more accurate with the same size or both). It might be a bit 
slower, especially merging. So it is not automatically better for all use 
cases. In particular, there is no fixed-size mode at all like HLL_6 and HLL_8 
(HLL_4 has no hard limit).

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