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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