fx19880617 opened a new pull request #5671:
URL: https://github.com/apache/incubator-pinot/pull/5671


   ## Description
   Per https://github.com/apache/incubator-pinot/issues/5663, this PR rewrite 
non-aggregation groupBy query to distinct query.
   e.g. 
   `SELECT col1+col2*5 FROM foo GROUP BY col1, col2` => `SELECT distinct 
col1+col2*5 FROM foo`
   `SELECT col1, col2 FROM foo GROUP BY col1, col2` => `SELECT distinct col1, 
col2 FROM foo`
   
   
   ## Release Notes
   
   Rewrite non-aggregation group by query to distinct query.


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