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https://issues.apache.org/jira/browse/CALCITE-1954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131439#comment-16131439
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MinJi Kim commented on CALCITE-1954:
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A small patch, but would appreciate another set of eyes to review this. Thank
you!
https://github.com/apache/calcite/pull/522
> SqlValidator need to maintain forceNullable across joins and renaming
> ---------------------------------------------------------------------
>
> Key: CALCITE-1954
> URL: https://issues.apache.org/jira/browse/CALCITE-1954
> Project: Calcite
> Issue Type: Bug
> Reporter: MinJi Kim
> Assignee: Julian Hyde
>
> In the following query below, SqlValidator return rowtype with the second
> column as NOT NULL. Since this is a left outer join, it should be nullable.
> {code}
> select * from
> (select row_number() over (order by sal) from emp) as emp1(r1)
> left outer join
> (select dense_rank() over(order by sal) from emp) as emp2(r2)
> on (emp1.r1 = emp2.r2)
> {code}
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