gianm commented on issue #13816:
URL: https://github.com/apache/druid/issues/13816#issuecomment-1466861096

   > So, in the short term, perhaps the catalog will apply only to detail 
tables, but not rollup because type information in that case is not sufficient 
to allow any meaningful validation. Once the project leads sort out how MSQ 
aggregation will work, the catalog can implement whatever choices we make.
   
   I'd like to sort that out here on this issue (or wherever else makes sense), 
since I had been thinking that specifying rollup info in a catalog was a better 
solution than putting it in the DML statements, and I had been looking forward 
to that future. What's the problem with putting rollup info in a catalog?


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