xiedeyantu commented on code in PR #4733:
URL: https://github.com/apache/calcite/pull/4733#discussion_r2688369013
##########
core/src/test/resources/org/apache/calcite/test/SqlToRelConverterTest.xml:
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@@ -1892,15 +1892,15 @@ LogicalTableModify(table=[[CATALOG, SALES, EMP]],
operation=[DELETE], flattened=
</TestCase>
<TestCase name="testDistinctOrderByRand">
<Resource name="sql">
- <![CDATA[select distinct deptno, empno, 1, 'a' from emp order by rand(),
1]]>
+ <![CDATA[select distinct deptno, deptno, empno, 1, 'a' from emp order by
rand(), 1]]>
</Resource>
<Resource name="plan">
<![CDATA[
-LogicalProject(DEPTNO=[$0], EMPNO=[$1], EXPR$2=[$2], EXPR$3=[$3])
- LogicalSort(sort0=[$4], sort1=[$0], dir0=[ASC], dir1=[ASC])
- LogicalProject(DEPTNO=[$0], EMPNO=[$1], EXPR$2=[$2], EXPR$3=[$3],
EXPR$4=[RAND()])
+LogicalProject(DEPTNO=[$0], DEPTNO1=[$1], EMPNO=[$2], EXPR$2=[$3], EXPR$3=[$4])
+ LogicalSort(sort0=[$5], sort1=[$0], dir0=[ASC], dir1=[ASC])
+ LogicalProject(DEPTNO=[$0], DEPTNO0=[$0], EMPNO=[$1], EXPR$3=[$2],
EXPR$4=[$3], EXPR$5=[RAND()])
Review Comment:
My understanding is that the intermediate PROJECT1-AGG-PROJECT2 represents
the logic that the current modification can achieve. Therefore, PROJECT1 needs
to retain duplicate columns, but AGG should not have duplicate columns. If
PROJECT1 does not retain them, this information will be lost.
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