gianm commented on issue #8118: GroupBy array based result rows URL: https://github.com/apache/incubator-druid/issues/8118#issuecomment-513531300 It could certainly apply to them, although in the case of topN, it would be potentially wasteful: we'd need to write the timestamp once per result value instead of once per granular time bucket. (Right now, topN the result format is an array of time buckets, each one containing a timestamp + list of result values, and the nesting means the timestamp only needs to be written one time.)
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