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https://issues.apache.org/jira/browse/CALCITE-5253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17598192#comment-17598192
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Evgeny Stanilovsky commented on CALCITE-5253:
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Thanks, i change desc and summary a bit, do you think i also need to fix
mentioned:
{noformat}
"select *\n"
+ "from emp as e\n"
+ "join dept as d using (deptno)\n"
+ "join dept as d2 using (^deptno^)";
{noformat}
in this issue too ?
> Join expression validation partially broken.
> --------------------------------------------
>
> Key: CALCITE-5253
> URL: https://issues.apache.org/jira/browse/CALCITE-5253
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.31.0
> Reporter: Evgeny Stanilovsky
> Assignee: Evgeny Stanilovsky
> Priority: Major
> Labels: pull-request-available
>
> Such issue is not possible for now:
> {code:java}
> CREATE TABLE t1(a INTEGER, b INTEGER, c INTEGER);
> CREATE TABLE t2(b INTEGER, c INTEGER, d INTEGER);
> CREATE TABLE t3(c INTEGER, d INTEGER, e INTEGER);
> SELECT t1.c, t2.d, t1.b, t1.a, t3.e FROM t1 natural join t2 natural join t3
> WHERE t1.a=1;
> {code}
> cause:
> {noformat}
> SqlValidatorException: Column name 'C' in NATURAL join or USING clause is not
> unique on one side of join
> {noformat}
> This validation is correct for example for case :
>
> {noformat}
> select e.ename, d.name from dept as d natural join (select ename, sal as
> deptno, deptno from emp) as e
> {noformat}
> but fails for described above.
> Was broken by:
> [1] https://issues.apache.org/jira/browse/CALCITE-5171
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