gianm edited a comment on issue #6412: HyperLogLog merge is not commutative URL: https://github.com/apache/incubator-druid/issues/6412#issuecomment-426348996 It's true, but I don't see what we could or should do about it. The algorithm we use is noncommutative by design. One specifically noncommutative feature is the offset / 'floating max' system, which isn't part of standard HLL but is part of Druid's implementation. Although, either way, you will still get results within a predictable accuracy. I am not sure if the alternative HLL algorithm in #5712 is commutative or not, but maybe you could try that out too.
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