clintropolis opened a new pull request, #18204:
URL: https://github.com/apache/druid/pull/18204

   ### Description
   
   Fixes an issue with projection schema validation to ensure that all defined 
grouping columns either refer to a column present in the base table, or refers 
to a virtual column. This prevents projections from creating grouping columns 
that are not present in the base table


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