wojustme opened a new pull request #2714:
URL: https://github.com/apache/calcite/pull/2714


   Link to [CALCITE-5000](https://issues.apache.org/jira/browse/CALCITE-5000)
   
   The arg of max/min exists in the aggregate's group, we could optimize it.
   Such as:
   `select max(a) from tbl group by a` will be optimized to `select a from tbl 
group by a`


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