mistercrunch commented on issue #6066: Sorting rows when rollup is disabled URL: https://github.com/apache/incubator-druid/issues/6066#issuecomment-410043357 I'm guessing Druid does the rollup by sorting the dimensions in the order in the ingestion spec, which would indicate that dimension ordering would matter. Would ordering dims by based on cardinality help further? I'm guessing low->high card would be better than high->low, but idk enough about LZ(4?) compression to have a good intuition on this. I'm also unclear on whether low->high card dim ordering would make it harder/easier on the sorting algorithm. (?)
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