Jackie-Jiang opened a new pull request #5637:
URL: https://github.com/apache/incubator-pinot/pull/5637


   ## Description
   Support queries with order-by expressions not present in the select clause:
   - Existing code support order-by columns/transform functions not present in 
the select clause.
   - This PR add support for aggregations not present in the select clause.
   
   Example:
   ```
   select subject from transcript group by subject order by count(*) desc
   ```
   
   This is equivalent to 
   ```
   select subject, count(*) from transcript group by subject order by count(*) 
desc
   ```
   but the return response should not contain count(*).


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