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https://issues.apache.org/jira/browse/KYLIN-3322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775591#comment-16775591
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Vsevolod Ostapenko commented on KYLIN-3322:
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It's also reported as KYLIN-3687. It's good to have documentation updated, but 
it's better to prevent creation of the incomplete TopN cube definitions through 
the UI and via API calls.

> TopN requires a SUM to work
> ---------------------------
>
>                 Key: KYLIN-3322
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3322
>             Project: Kylin
>          Issue Type: Bug
>          Components: Measure - TopN
>            Reporter: liyang
>            Assignee: Na Zhai
>            Priority: Major
>
> Currently if user creates a measure of TopN seller by sum of price, it is 
> required that user also creates a measure of SUM(price). Otherwise, NPE will 
> be thrown at query time.



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