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https://issues.apache.org/jira/browse/KYLIN-1419?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shaofeng SHI resolved KYLIN-1419.
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Resolution: Fixed
> NullPointerException occurs when query from subqueries with order by
> --------------------------------------------------------------------
>
> Key: KYLIN-1419
> URL: https://issues.apache.org/jira/browse/KYLIN-1419
> Project: Kylin
> Issue Type: Bug
> Components: Query Engine
> Affects Versions: v1.2
> Reporter: nichunen
> Assignee: nichunen
> Fix For: v2.1, v2.0, v1.3
>
> Attachments: KYLIN-1419-V2.patch, KYLIN-1419.patch
>
>
> Context may not have table scan which is created by OLAPJoinRel, so it does
> not have realization. In
> org.apache.kylin.query.relnode.OLAPSortRel#findMeasure, it visits
> "this.context.realization" directly, so makes the NullPointerException. For
> example, query like "select a.LSTG_FORMAT_NAME from (select
> LEAF_CATEG_ID,LSTG_FORMAT_NAME from KYLIN_SALES)a, (select
> LEAF_CATEG_ID,PART_DT from KYLIN_SALES)b order by a.LSTG_FORMAT_NAME".
> Attached is the patch to fix, added a null protection.
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