[I] Support group-by without aggregation [pinot]

["Jackie-Jiang (via GitHub)" <gi...@apache.org>]

Jackie-Jiang opened a new issue, #11923:
URL: https://github.com/apache/pinot/issues/11923

   Currently queries such as `SELECT a, b FROM table GROUP BY a, b` is rewritten to `SELECT DISTINCT a, b FROM table` and we solve it as distinct query.
   But queries such as `SELECT a + b FROM table GROUP BY a, b` should not be solved as distinct because query semantic is different. We stopped rewriting such queries in #9605, and they are no longer supported.
   We should support this query natively without query rewrite


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