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  1. Teiid
  2. TEIID-4280

NPE in RuleMergeVirtual when running a query with nested CTEs

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      Description

      I defined the following view, based on a table in PostgreSQL (pg.test_a):

      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;
      

      When I run this query:

      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
      

      this exception is thrown:

      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)
      

      The same error occurs using inline views too.

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              • Assignee:
                shawkins Steven Hawkins
                Reporter:
                fox123 Salvatore R
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                • Created:
                  Updated:
                  Resolved: