Issue

• server.log contains error similar to:

  ERROR [org.teiid.PROCESSOR] (Worker2_QueryProcessorQueue33) TEIID30019 Unexpected exception for request vq8JhBO6ioDj.0: java.lang.AssertionError: Cannot create AliasSymbol wrapping AliasSymbol
  at org.teiid.core.util.Assertion.failed(Assertion.java:73) [teiid-common-core-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.symbol.AliasSymbol.setSymbol(AliasSymbol.java:76) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.symbol.AliasSymbol.<init>(AliasSymbol.java:59) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.visitor.ExpressionMappingVisitor.replaceSymbol(ExpressionMappingVisitor.java:148) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.visitor.ExpressionMappingVisitor.visit(ExpressionMappingVisitor.java:82) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.lang.Select.acceptVisitor(Select.java:167) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.navigator.AbstractNavigator.visitVisitor(AbstractNavigator.java:54) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.navigator.PreOrPostOrderNavigator.postVisitVisitor(PreOrPostOrderNavigator.java:61) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.navigator.PreOrPostOrderNavigator.visit(PreOrPostOrderNavigator.java:343) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.lang.Select.acceptVisitor(Select.java:167) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.sql.navigator.DeepPostOrderNavigator.doVisit(DeepPostOrderNavigator.java:40) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.optimizer.TriggerActionPlanner.rewritePlan(TriggerActionPlanner.java:166) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.optimizer.TriggerActionPlanner.optimize(TriggerActionPlanner.java:86) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.optimizer.relational.RelationalPlanner.addNestedProcedure(RelationalPlanner.java:762) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.optimizer.relational.RelationalPlanner.createUpdatePlan(RelationalPlanner.java:683) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.optimizer.relational.RelationalPlanner.generatePlan(RelationalPlanner.java:647) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.optimizer.relational.RelationalPlanner.optimize(RelationalPlanner.java:232) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.query.optimizer.QueryOptimizer.optimizePlan(QueryOptimizer.java:159) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.Request.generatePlan(Request.java:408) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.Request.processRequest(Request.java:435) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.RequestWorkItem.processNew(RequestWorkItem.java:613) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:315) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:51) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:254) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:274) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210) [teiid-engine-8.7.1.6_2-redhat-6.jar:8.7.1.6_2-redhat-6]
  at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [rt.jar:1.8.0_66]
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [rt.jar:1.8.0_66]
  at java.lang.Thread.run(Unknown Source) [rt.jar:1.8.0_66]