clintropolis commented on pull request #11379:
URL: https://github.com/apache/druid/pull/11379#issuecomment-866754269


   it would probably also be worth measuring the code prior to this change 
using the query context parameter `vectorizeVirtualColumns` set to `true` (it 
is off by default currently, though this might soon change) so that the 
original query with all granularity can use the vectorized group by engine and 
expression processing.
   
   That said, using granularity instead of expressions very well could still be 
faster, even if they can use the vectorized engine.


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