[jira] [Created] (KYLIN-1480) NPE throws while execute sql with more than two join.

["fengYu (JIRA)" <ji...@apache.org>]

fengYu created KYLIN-1480:
-----------------------------

             Summary: NPE throws while execute sql with more than two join.
                 Key: KYLIN-1480
                 URL: https://issues.apache.org/jira/browse/KYLIN-1480
             Project: Kylin
          Issue Type: Bug
          Components: Query Engine
    Affects Versions: v1.0, v1.1, v1.2, v2.0
            Reporter: fengYu
            Assignee: liyang


Hi, I encounter NPE while execute sql more than two join, for example : 
select A.type, A.cmd, count(1) from fact as A inner join (select type, count(1) from fact group by type having count(1) > 2) as B on A.type = B.type inner join (select cmd, count(1) from fact group by cmd having count(1) > 2) as C on A.cmd = C.cmd group by A.type, A.cmd;

the fact table is create like this : 
CREATE TABLE `fact`(
  `fname` string, 
  `lname` string, 
  `dt` date, 
  `cost` int, 
  `type` string, 
  `cmd` string);

Kylin throws exception like this : 
Caused by: java.lang.NullPointerException
        at org.apache.kylin.query.relnode.OLAPProjectRel.implementOLAP(OLAPProjectRel.java:103)
        at org.apache.kylin.query.relnode.OLAPRel$OLAPImplementor.visitChild(OLAPRel.java:81)
        at org.apache.kylin.query.relnode.OLAPAggregateRel.implementOLAP(OLAPAggregateRel.java:132)
        at org.apache.kylin.query.relnode.OLAPRel$OLAPImplementor.visitChild(OLAPRel.java:81)
        at org.apache.kylin.query.relnode.OLAPLimitRel.implementOLAP(OLAPLimitRel.java:73)
        at org.apache.kylin.query.relnode.OLAPRel$OLAPImplementor.visitChild(OLAPRel.java:81)
        at org.apache.kylin.query.relnode.OLAPToEnumerableConverter.implement(OLAPToEnumerableConverter.java:67)
        at org.apache.calcite.adapter.enumerable.EnumerableRelImplementor.implementRoot(EnumerableRelImplementor.java:99)
        at org.apache.calcite.adapter.enumerable.EnumerableInterpretable.toBindable(EnumerableInterpretable.java:92)
        at org.apache.calcite.prepare.CalcitePrepareImpl$CalcitePreparingStmt.implement(CalcitePrepareImpl.java:1050)
        at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:293)
        at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:188)
        at org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:671)
        at org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:572)
        at org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:541)
        at org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:173)
        at org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:561)
        at org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:477)
        at org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:109)

I try it in kylin-1.0 and kylin-2.x-staging, the same exception throws.



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