[teiid-issues] [JBoss JIRA] (TEIID-5686) NPE in MergeJoinStrategy when using joins with a particular limit value

[Steven Hawkins (Jira)]

     [ https://issues.jboss.org/browse/TEIID-5686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins updated TEIID-5686:
----------------------------------
    Fix Version/s: 12.2


> NPE in MergeJoinStrategy when using joins with a particular limit value
> -----------------------------------------------------------------------
>
>                 Key: TEIID-5686
>                 URL: https://issues.jboss.org/browse/TEIID-5686
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 12.0
>         Environment: teiid-12.0.0 on WildFly Full 14.0.1.Final (WildFly Core 6.0.2.Final)
>            Reporter: dalex dalex
>            Assignee: Steven Hawkins
>            Priority: Blocker
>             Fix For: 12.2
>
>
> When running the following query (IMPORTANT: you shouldn't use row limit):
> {code:sql}
> begin
>     declare integer i=0;
>     while (i < 2)
>         begin
>             select * 
>             from "test_tables_pg.test_a" t0
>             JOIN "test_tables_pg.test_e" t1
>               ON true
>             JOIN "test_tables_pg.test_e" t2
>               ON true
>             JOIN views.v t3
>                   on true
>             JOIN views.v t4
>                   on true
>             limit 257 ;
>             i=i+1;
>         end
> end ;;
> {code}
> teiid throws out the following NPE:
> {code:noformat}
> 2019-03-13 13:50:28,582 ERROR [org.teiid.PROCESSOR] (Worker4_QueryProcessorQueue233) InwGU8fhfbja TEIID30019 Unexpected exception for request InwGU8fhfbja.22: java.lang.NullPointerEx
> ception
>         at org.teiid.query.processor.relational.MergeJoinStrategy.compareToPrevious(MergeJoinStrategy.java:284)
>         at org.teiid.query.processor.relational.MergeJoinStrategy.process(MergeJoinStrategy.java:238)
>         at org.teiid.query.processor.relational.JoinNode.nextBatchDirectInternal(JoinNode.java:260)
>         at org.teiid.query.processor.relational.JoinNode.nextBatchDirect(JoinNode.java:195)
>         at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:277)
>         at org.teiid.query.processor.relational.LimitNode.nextBatchDirect(LimitNode.java:98)
>         at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:277)
>         at org.teiid.query.processor.relational.ProjectNode.nextBatchDirect(ProjectNode.java:146)
>         at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:277)
>         at org.teiid.query.processor.relational.RelationalPlan.nextBatch(RelationalPlan.java:141)
>         at org.teiid.query.processor.QueryProcessor.nextBatchDirect(QueryProcessor.java:148)
>         at org.teiid.query.processor.QueryProcessor.nextBatch(QueryProcessor.java:111)
>         at org.teiid.query.processor.BatchIterator.finalRow(BatchIterator.java:65)
>         at org.teiid.common.buffer.AbstractTupleSource.getCurrentTuple(AbstractTupleSource.java:66)
>         at org.teiid.query.processor.BatchIterator.getCurrentTuple(BatchIterator.java:80)
>         at org.teiid.common.buffer.AbstractTupleSource.nextTuple(AbstractTupleSource.java:44)
>         at org.teiid.query.processor.proc.ProcedurePlan.nextBatchDirect(ProcedurePlan.java:303)
>         at org.teiid.query.processor.proc.ProcedurePlan.nextBatch(ProcedurePlan.java:269)
>         at org.teiid.query.processor.QueryProcessor.nextBatchDirect(QueryProcessor.java:148)
>         at org.teiid.query.processor.QueryProcessor.nextBatch(QueryProcessor.java:111)
>         at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:160)
>         at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:142)
>         at org.teiid.dqp.internal.process.RequestWorkItem.processMore(RequestWorkItem.java:492)
>         at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:362)
>         at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:43)
>         at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:285)
>         at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:281)
>         at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:113)
>         at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:199)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)
> {code}



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