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https://issues.apache.org/jira/browse/CALCITE-5749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17730516#comment-17730516
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xiong duan commented on CALCITE-5749:
-------------------------------------
After the test in PostgreSQL. Both SQL is invalid.
{code:java}
----[42712] ERROR: table name "emp" specified more than once
select emp.deptno from emp, emp;
----[42712] ERROR: table name "emp" specified more than once
select emp.deptno from emp, dept as emp;{code}
> Join table with different database name and same table name will throw
> exception
> --------------------------------------------------------------------------------
>
> Key: CALCITE-5749
> URL: https://issues.apache.org/jira/browse/CALCITE-5749
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.34.0
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
>
> When we execute SQL:
> {code:java}
> select * from test1.tablea,test2.tablea {code}
> Calcite will throw exception:
> {code:java}
> Duplicate relation name 'tablea' in FROM clause {code}
> Because when we generate alias for this table, just use the last value in the
> names.
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