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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2019/11/27 10:57:13 UTC
[GitHub] [incubator-druid] vogievetsky commented on issue #8947: Unnecessary
cartesian explosion if multi-value column is reused in expression
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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