INNER JOINs of two CTEs fail with ASSERTION FAILED error message ---------------------------------------------------------------- Key: TEIID-5004 URL: https://issues.jboss.org/browse/TEIID-5004 Project: Teiid Issue Type: Bug Components: Query Engine Affects Versions: 9.3, 9.3.1 Environment: teiid-9.3.0.Final on WildFly Full 10.0.0.Final (WildFly Core 2.0.10.Final) and teiid-9.3.1 on WildFly Full 10.0.0.Final (WildFly Core 2.0.10.Final) Reporter: dalex dalex Assignee: Steven Hawkins Priority: Blocker when running the following query several times in a row: {code:sql} with CTE1 as ( select a1 from ( -->> with CTE11 as (select a1 from ( WITH alias as (SELECT 1 as a), alias1 as (select alias.a as alias, AAA.a as alias1, AAA.b as a from alias join test.test_a AAA on alias.a!=AAA.a or alias.a!=AAA.a), alias2 as (with alias as (select alias.a as alias, AAA.a as alias1, AAA.b as a from alias join test.test_a AAA on alias.a!=AAA.a or alias.a!=AAA.a) select * from alias), alias3 as (with alias as (select alias.a as alias, AAA.a as alias1, AAA.a from alias join alias2 AAA on alias.a!=AAA.a or alias.a!=AAA.a) select * from alias) SELECT AAA.alias1 as a1 FROM alias join alias1 as AAA on alias.a=AAA.a or alias.a!=AAA.a join alias2 on AAA.a=alias2.a or AAA.a!=alias.a left join alias3 on alias3.a=alias2.a or alias3.a!=alias2.a ) tv2) --<< select a1 from CTE11 ) as SUBQ1), CTE2 as ( select a1 from ( -->> with CTE21 as (select a1 from ( WITH alias as (SELECT 1 as a), alias1 as (select alias.a as alias, AAA.a as alias1, AAA.b as a from alias join test.test_a AAA on alias.a!=AAA.a or alias.a!=AAA.a), alias2 as (with alias as (select alias.a as alias, AAA.a as alias1, AAA.b as a from alias join test.test_a AAA on alias.a!=AAA.a or alias.a!=AAA.a) select * from alias), alias3 as (with alias as (select alias.a as alias, AAA.a as alias1, AAA.a from alias join alias2 AAA on alias.a!=AAA.a or alias.a!=AAA.a) select * from alias) SELECT AAA.alias1 as a1 FROM alias join alias1 as AAA on alias.a=AAA.a or alias.a!=AAA.a join alias2 on AAA.a=alias2.a or AAA.a!=alias.a left join alias3 on alias3.a=alias2.a or alias3.a!=alias2.a ) tv2) --<< select a1 from CTE21 ) as SUBQ2) select * from CTE1 as T1 join CTE2 as T2 on T1.a1=T2.a1 {code} teiid returns the following stacktrace (from teiid 9.3.1): {code} 2017-07-21 16:52:32,440 ERROR [org.teiid.PROCESSOR] (Worker1_QueryProcessorQueue73) oiBQAQPtTMe+ TEIID30019 Unexpected exception for request oiBQAQPtTMe+.15: java.lang.AssertionError : ASSERTION FAILED: expected reference to be not null at org.teiid.core.util.Assertion.failed(Assertion.java:73) at org.teiid.core.util.Assertion.isNotNull(Assertion.java:100) at org.teiid.core.util.Assertion.isNotNull(Assertion.java:92) at org.teiid.common.buffer.TupleBuffer.getBatch(TupleBuffer.java:287) at org.teiid.dqp.internal.process.TupleSourceCache$CopyOnReadTupleSource.nextTuple(TupleSourceCache.java:103) at org.teiid.query.processor.relational.AccessNode.nextBatchDirect(AccessNode.java:394) at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:281) at org.teiid.query.processor.BatchIterator.finalRow(BatchIterator.java:69) at org.teiid.common.buffer.AbstractTupleSource.getCurrentTuple(AbstractTupleSource.java:70) at org.teiid.query.processor.BatchIterator.getCurrentTuple(BatchIterator.java:84) at org.teiid.common.buffer.AbstractTupleSource.hasNext(AbstractTupleSource.java:92) at org.teiid.query.processor.relational.MergeJoinStrategy.process(MergeJoinStrategy.java:165) at org.teiid.query.processor.relational.JoinNode.nextBatchDirect(JoinNode.java:235) at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:281) at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:164) at org.teiid.query.processor.relational.SourceState.prefetch(SourceState.java:211) at org.teiid.query.processor.relational.SourceState.rowCountLE(SourceState.java:158) at org.teiid.query.processor.relational.JoinNode.nextBatchDirect(JoinNode.java:227) at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:281) at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:164) at org.teiid.query.processor.relational.SourceState.prefetch(SourceState.java:211) at org.teiid.query.processor.relational.JoinNode.prefetch(JoinNode.java:255) at org.teiid.query.processor.relational.JoinNode.nextBatchDirect(JoinNode.java:247) at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:281) at org.teiid.query.processor.relational.LimitNode.nextBatchDirect(LimitNode.java:102) at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:281) at org.teiid.query.processor.relational.ProjectNode.nextBatchDirect(ProjectNode.java:150) at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:281) at org.teiid.query.processor.relational.RelationalPlan.nextBatch(RelationalPlan.java:145) at org.teiid.query.processor.QueryProcessor.nextBatchDirect(QueryProcessor.java:151) at org.teiid.query.processor.QueryProcessor.nextBatch(QueryProcessor.java:114) at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:164) at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:146) at org.teiid.dqp.internal.process.RequestWorkItem.processMore(RequestWorkItem.java:477) at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:349) at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:51) at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:275) at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:284) at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119) at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) {code}