[TAJO-881] JOIN with union query occurs NPE

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Assignee: Hyoungjun Kim
• Reporter: Hyoungjun Kim
• Created: 18/Jun/14 08:26
• Updated: 26/Jun/14 03:42
• Resolved: 26/Jun/14 03:42

Description

The following query occurs NPE.

select a.id, b.c_name from ( 
  select l_partkey as id from lineitem 
  union all 
  select o_orderkey as id from orders 
) a 
join customer b on a.id = b.c_custkey

2014-06-18 16:33:54,592 ERROR: org.apache.tajo.master.querymaster.QueryMasterTask (startQuery(364)) - 
java.lang.NullPointerException
	at org.apache.tajo.engine.planner.global.DataChannel.<init>(DataChannel.java:55)
	at org.apache.tajo.engine.planner.global.GlobalPlanner.createDataChannelFromJoin(GlobalPlanner.java:178)
	at org.apache.tajo.engine.planner.global.GlobalPlanner.buildJoinPlan(GlobalPlanner.java:315)
	at org.apache.tajo.engine.planner.global.GlobalPlanner.access$300(GlobalPlanner.java:54)
	at org.apache.tajo.engine.planner.global.GlobalPlanner$DistributedPlannerVisitor.visitJoin(GlobalPlanner.java:1106)
	at org.apache.tajo.engine.planner.global.GlobalPlanner$DistributedPlannerVisitor.visitJoin(GlobalPlanner.java:967)
	at org.apache.tajo.engine.planner.BasicLogicalPlanVisitor.visit(BasicLogicalPlanVisitor.java:84)
	at org.apache.tajo.engine.planner.BasicLogicalPlanVisitor.visitRoot(BasicLogicalPlanVisitor.java:142)
	at org.apache.tajo.engine.planner.global.GlobalPlanner$DistributedPlannerVisitor.visitRoot(GlobalPlanner.java:972)
	at org.apache.tajo.engine.planner.global.GlobalPlanner$DistributedPlannerVisitor.visitRoot(GlobalPlanner.java:967)
	at org.apache.tajo.engine.planner.BasicLogicalPlanVisitor.visit(BasicLogicalPlanVisitor.java:58)
	at org.apache.tajo.engine.planner.global.GlobalPlanner.build(GlobalPlanner.java:134)
	at org.apache.tajo.master.querymaster.QueryMasterTask.startQuery(QueryMasterTask.java:356)
	at org.apache.tajo.master.querymaster.QueryMasterTask.start(QueryMasterTask.java:176)
	at org.apache.tajo.master.querymaster.QueryMaster$QueryStartEventHandler.handle(QueryMaster.java:380)
	at org.apache.tajo.master.querymaster.QueryMaster$QueryStartEventHandler.handle(QueryMaster.java:371)
	at org.apache.tajo.master.TajoAsyncDispatcher.dispatch(TajoAsyncDispatcher.java:137)
	at org.apache.tajo.master.TajoAsyncDispatcher$1.run(TajoAsyncDispatcher.java:79)
	at java.lang.Thread.run(Thread.java:744)