xiedeyantu commented on code in PR #4417:
URL: https://github.com/apache/calcite/pull/4417#discussion_r2156218256
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core/src/test/java/org/apache/calcite/test/SqlValidatorTest.java:
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@@ -6589,12 +6610,14 @@ public boolean isBangEqualAllowed() {
sql("select deptno + empno as d, deptno + empno + mgr from emp"
+ " group by d,mgr")
.withConformance(lenient).ok();
- // When alias is equal to one or more columns in the query then giving
- // priority to alias. But Postgres may throw ambiguous column error or give
- // priority to column name.
+ // Alias is not used since there is a single column in the SELECT already
matching
sql("select count(*) from (\n"
- + " select ename AS deptno FROM emp GROUP BY deptno) t")
- .withConformance(lenient).ok();
+ + " select ^ename^ AS deptno FROM emp GROUP BY deptno) t")
+ .withConformance(strict)
+ .fails("Expression 'ENAME' is not being grouped")
+ .withConformance(lenient)
Review Comment:
I am a little confused. The code comments say that it is implemented
completely according to MySQL's behavior, and there are two explanations, but
the test case does not seem to meet these two explanations?
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