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https://issues.apache.org/jira/browse/KYLIN-2234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15714049#comment-15714049
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liyang commented on KYLIN-2234:
-------------------------------

Verified on master branch. Cannot reproduce. Believe this was fixed.

> KYLIN throws null exception when execute specific query
> -------------------------------------------------------
>
>                 Key: KYLIN-2234
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2234
>             Project: Kylin
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: v1.5.3
>            Reporter: Hao Lin
>            Assignee: liyang
>
> KYLIN throws null pointer exception when executing a specify query. The query 
> tries to calculate VV ratio of condition A and condition B. For simplicity, a 
> minimum query is rewriten on ‘learn_kylin’ project and the condition is 
> removed, so it can be reproduced easily.
>  
> *Query*
> {code:xml}
> SELECT t1.PART_DT, SUM(t2.vv) / SUM(t1.vv) AS vv_rate
> FROM
> (
> SELECT  PART_DT, COUNT(1) as vv
> FROM KYLIN_SALES
> GROUP BY PART_DT
> ) AS t1
> JOIN
> (
> SELECT  PART_DT, COUNT(1) as vv
> FROM KYLIN_SALES
> GROUP BY PART_DT
> ) AS t2
> ON (t1.PART_DT = t2.PART_DT)
> GROUP BY t1.PART_DT
> {code}
>  
> *KYLIN Server LOG*
> {code}
> null
>         at org.apache.calcite.avatica.Helper.createException(Helper.java:56)
>         at org.apache.calcite.avatica.Helper.createException(Helper.java:41)
>         at 
> org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:143)
>         at 
> org.apache.calcite.avatica.AvaticaStatement.executeQuery(AvaticaStatement.java:186)
>         at 
> org.apache.kylin.rest.service.QueryService.execute(QueryService.java:366)
>         at 
> org.apache.kylin.rest.service.QueryService.queryWithSqlMassage(QueryService.java:278)
>         at 
> org.apache.kylin.rest.service.QueryService.query(QueryService.java:121)
>         at 
> org.apache.kylin.rest.service.QueryService$$FastClassByCGLIB$$4957273f.invoke(<generated>)
> …..
> Caused by: java.lang.NullPointerException
>         at 
> org.apache.kylin.query.relnode.OLAPAggregateRel.translateAggregation(OLAPAggregateRel.java:268)
>         at 
> org.apache.kylin.query.relnode.OLAPAggregateRel.implementRewrite(OLAPAggregateRel.java:240)
>         at 
> org.apache.kylin.query.relnode.OLAPRel$RewriteImplementor.visitChild(OLAPRel.java:121)
>         at 
> org.apache.kylin.query.relnode.OLAPProjectRel.implementRewrite(OLAPProjectRel.java:233)
>         at 
> org.apache.kylin.query.relnode.OLAPRel$RewriteImplementor.visitChild(OLAPRel.java:121)
>         at 
> org.apache.kylin.query.relnode.OLAPLimitRel.implementRewrite(OLAPLimitRel.java:101)
>         at 
> org.apache.kylin.query.relnode.OLAPRel$RewriteImplementor.visitChild(OLAPRel.java:121)
>         at 
> org.apache.kylin.query.relnode.OLAPToEnumerableConverter.implement(OLAPToEnumerableConverter.java:95)
>         at 
> org.apache.calcite.adapter.enumerable.EnumerableRelImplementor.implementRoot(EnumerableRelImplementor.java:102)
> {code}



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