timothy-e commented on PR #18658:
URL: https://github.com/apache/pinot/pull/18658#issuecomment-4782490282

   > Heads-up: found one more user-facing behavioral change in the 1.40 → 1.42 
delta that isn't covered in the behavior notes above.
   > 
   > **[CALCITE-7052](https://issues.apache.org/jira/browse/CALCITE-7052) 
(1.41) 
   
   We ran into this issue as well.
   
   The original commit even changes a unit test from passing to failing.
   
   ```diff
     @Test void testGroupByAliasEqualToColumnName() {
       // If the alias (deptno) matches an existing column, it is not used in 
the GROUP BY
       sql("select empno, ename as deptno from emp group by empno, deptno")
   +        .withConformance(SqlConformanceEnum.LENIENT)
   +        .throws_("Expression 'ENAME' is not being grouped");
   +    // If the alias is a new one, it is used in the GROUP BY
   +    sql("select empno, ename as x from emp group by empno, x")
           .withConformance(SqlConformanceEnum.LENIENT).ok();
     }
   ```
   
   Can we add the `backwards-incompat` to this PR too? It's a little stronger 
than `needs-attention`. 


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