dbardbar commented on pull request #12078:
URL: https://github.com/apache/druid/pull/12078#issuecomment-998524034


   @cryptoe - two questions
   1) Would this work also for a VirtualColumn which produces a multi-value? 
Specifically, VirtualColumn of type "mv-filtered".
   2) We needed the capability in this PR, but since it was missing we created 
another string dimension during ingestion, which holds the values of the MV 
column as a simple string. We then used that extra column in our GROUP BY, to 
achieve the same functionality as this PR. Do you think that your method would 
be comparable in performance?
   


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