nichunen created KYLIN-1419:
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Summary: 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: liyang
Fix For: v1.3
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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