NPE in RuleMergeVirtual when running a query with nested CTEs ------------------------------------------------------------- Key: TEIID-4280 URL: https://issues.jboss.org/browse/TEIID-4280 Project: Teiid Issue Type: Bug Components: Query Engine Reporter: Salvatore R Assignee: Steven Hawkins Fix For: 9.1, 9.0.1 I defined the following view, based on a table in PostgreSQL (pg.test_a): {code:sql} create view tv1 as WITH alias as (SELECT a from pg.test_a), alias2 as (select t2.a as a1, t1.a from alias t1 join (SELECT a from pg.test_a) t2 on t1.a=t2.a), alias3 as (select t2.a as a1, t1.a from alias t1 join alias2 t2 on t1.a=t2.a) SELECT alias3.a1 FROM alias2 join alias3 on alias3.a=alias2.a; {code} When I run this query: {code:sql} with CTE1 as ( select a1 from ( with CTE11 as (select a1 from views.tv1) select a1 from CTE11 ) as SUBQ1), CTE2 as ( select a1 from ( with CTE21 as (select a1 from views.tv1) select a1 from CTE21 ) as SUBQ2) select * from CTE1 as T1 join CTE2 as T2 on T1.a1=T2.a1 {code} this exception is thrown: {code:sql} 16:36:34,749 ERROR [org.teiid.PROCESSOR] (Worker17_QueryProcessorQueue112) cMD3wCUrebvy TEIID30019 Unexpected exception for request cMD3wCUrebvy.34: java.lang.NullPointerException at org.teiid.query.optimizer.relational.rules.RuleMergeVirtual.doMerge(RuleMergeVirtual.java:218) at org.teiid.query.optimizer.relational.rules.RuleMergeVirtual.execute(RuleMergeVirtual.java:84) at org.teiid.query.optimizer.relational.RelationalPlanner.executeRules(RelationalPlanner.java:870) at org.teiid.query.optimizer.relational.RelationalPlanner.optimize(RelationalPlanner.java:226) at org.teiid.query.optimizer.relational.RelationalPlanner.planWith(RelationalPlanner.java:361) at org.teiid.query.optimizer.relational.RelationalPlanner.optimize(RelationalPlanner.java:206) at org.teiid.query.optimizer.QueryOptimizer.optimizePlan(QueryOptimizer.java:159) at org.teiid.dqp.internal.process.Request.generatePlan(Request.java:445) at org.teiid.dqp.internal.process.Request.processRequest(Request.java:473) at org.teiid.dqp.internal.process.RequestWorkItem.processNew(RequestWorkItem.java:655) at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:337) at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:51) at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:274) at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:276) at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119) at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) {code} The same error occurs using inline views too.