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

[dalex dalex (Jira)]

dalex dalex created TEIID-5686:
----------------------------------

             Summary: 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


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}



--
This message was sent by Atlassian Jira
(v7.12.1#712002)