DaimonPl commented on issue #5712: HllSketch module URL: https://github.com/apache/incubator-druid/pull/5712#issuecomment-411322910 We are looking forward to have this feature. We had to migrate another datasource from druid hll to thetasketch - because druid hll was as innacurate as 10% in some case. But... we are only doing count distinct approximation - once we have HllSketch available we would most likely migrate to it from thetasketch for speed/size improvement
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