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https://issues.apache.org/jira/browse/KYLIN-2974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275854#comment-16275854
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liyang commented on KYLIN-2974:
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I understand. Thanks Hao. Commit merged. Please use better commit message next
time. The message was just "init" in the patch and I have revised it.
https://github.com/apache/kylin/commit/f5e22801704b31820f08ca1cae74ab685ec42ec0
> zero joint group can lead to query error
> ----------------------------------------
>
> Key: KYLIN-2974
> URL: https://issues.apache.org/jira/browse/KYLIN-2974
> Project: Kylin
> Issue Type: Bug
> Components: Query Engine
> Affects Versions: v2.1.0
> Reporter: Yang Hao
> Assignee: Yang Hao
> Attachments: KYLIN-2974.patch
>
>
> When query a sql, it turns to find all possible aggregation group. But it may
> cause error when the joint group is empty. Relevant code is
> {code:java}
> cuboidID = cuboidID | Collections.min(agg.getJoints(),
> cuboidSelectComparator);
> {code}
> In our env, when we have multiple aggregation groups, it may trigger the error
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