xiedeyantu commented on code in PR #4733:
URL: https://github.com/apache/calcite/pull/4733#discussion_r2688424164
##########
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:
Oh, my understanding of duplicate columns is that they should be excluded in
the AGG but retained in the PROJECT. To handle the RAND() issue, a PROJECT is
added above the AGG to be compatible with RAND(). My concern is whether there
will be other operators above the PROJECT (perhaps FILTER?), and whether those
other operators will have other PROJECTs, which involves the depth of
processing. I think I need to verify the original logic again to see what the
plan with duplicate columns looks like.
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