clintropolis commented on issue #8947: Unnecessary cartesian explosion if multi-value column is reused in expression URL: https://github.com/apache/incubator-druid/issues/8947#issuecomment-559049961 >I believe that the logical behavior would be for an expression to be a cartesian map over all unique multi-value dimensions present in it. The behavior you suggest seems fine to me, your example presents a good case for why it should be like that, and as previously mentioned, this was the behavior until #8019 (still drawing a blank as to why we decided to make the change earlier). I have opened #8957 which essentially reverts this behavior (without removing the improvements of that PR), should we all agree the old behavior is more useful.
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