richardstartin commented on pull request #8398:
URL: https://github.com/apache/pinot/pull/8398#issuecomment-1077811850


   I thought about this some more. The case I mentioned above is likely rare. I 
think:
   
   1. Metric columns should not have a dictionary by default. This will 
generally make aggregations faster.
   2. If a user decides to add a dictionary for a metric column, they should 
get one no matter what, without needing to understand any other configurations


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