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https://issues.apache.org/jira/browse/KYLIN-3322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773830#comment-16773830
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Shaofeng SHI commented on KYLIN-3322:
-------------------------------------
TopN does need a separate SUM measure to work. We will update the document to
let user know this.
> 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
> 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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