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https://issues.apache.org/jira/browse/KYLIN-2974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16224764#comment-16224764
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Yang Hao commented on KYLIN-2974:
---------------------------------
The method isOnTree may satisfy it
{code:java}
public boolean isOnTree(long cuboidID) {
if (cuboidID <= 0) {
return false; //cuboid must be greater than 0
}
if ((cuboidID & ~partialCubeFullMask) != 0) {
return false; //a cuboid's parent within agg is at most
partialCubeFullMask
}
return checkMandatoryColumns(cuboidID) && checkHierarchy(cuboidID) &&
checkJoint(cuboidID);
}
{code}
> joint group is Null 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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