peferron edited a comment on issue #7187: Improve topN algorithm URL: https://github.com/apache/incubator-druid/issues/7187#issuecomment-472576423 @leerho It's well understood (thanks to this dicussion) that FIS would be better than the current algorithm for a subset of topN queries, and I'm sure that most Druid users would love having that. Regarding the subset of topN queries that FIS cannot replace, though, removing that functionality from Druid without an alternative is not realistic, even though the data sensitivity and lack of error bounds are big issues.
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