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https://issues.apache.org/jira/browse/CALCITE-800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14626698#comment-14626698
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Sean Hsuan-Yi Chu commented on CALCITE-800:
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I will make it a negative case. Besides, for the addition cases you listed:
(1). In SqlValidatorTest.testWindowFunctions2(), rule 6a includes this.
(2). In SqlValidatorTest.testWindowFunctions2(), rule 6b includes this.
(3). In SqlValidatorTest.testWindowFunctions2(), there is one. 
*(4). Did you mean "partition by"? I think ROW_NUMBER requires ORDER BY 
(oracle: 
http://docs.oracle.com/cd/B28359_01/server.111/b28286/functions144.htm#SQLRF06100).
(5). Added one


> Window function defined within another window function should be blocked at 
> validation
> --------------------------------------------------------------------------------------
>
>                 Key: CALCITE-800
>                 URL: https://issues.apache.org/jira/browse/CALCITE-800
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Sean Hsuan-Yi Chu
>            Assignee: Sean Hsuan-Yi Chu
>
> For instance,
> {code}
> select sum(deptno) over (order by 
> sum(deptno) over(order by deptno)) 
> from emp
> {code}
> This is an invalid query. However, it passes the validation.



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