gianm commented on issue #8118: GroupBy array based result rows URL: https://github.com/apache/incubator-druid/issues/8118#issuecomment-513529149 The idea is the row order would be determined solely by the granularity, dimensions, aggregators, and post-aggregators, in the following way: 1. If `granularity != ALL` then the first element is a row timestamp. Otherwise, the timestamp is omitted. 2. The next set of elements are each dimension, in order. 3. Then aggregators. 4. Then post-aggregators. These might be omitted if they haven't been computed yet (e.g. they won't be included in the ResultRow objects that come from the per-segment engine). There aren't any headers, callers would be expected to know which element is which based on the above rules.
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