vogievetsky 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-559038163 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. Hence `"case_searched((\"dstGroups\" == 'b'),'b',(\"dstGroups\" == 'g'),'g','Other')"` and `concat(x, x)` would work the same way by virtue of the fact that they both only refer to one variable.
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