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Yang Hao commented on KYLIN-2974: --------------------------------- it may be caused by "kylin.cube.aggrgroup.is-mandatory-only-valid", for the default value is false. If there are many aggs in a cube, and one agg is full of the mandatory columns, then one query with all column in the agg, it may trigger the error > 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 -- This message was sent by Atlassian JIRA (v6.4.14#64029)