hyoungjunkim created TAJO-739:
---------------------------------
Summary: A subquery with the same column alias caused planning
error.
Key: TAJO-739
URL: https://issues.apache.org/jira/browse/TAJO-739
Project: Tajo
Issue Type: Bug
Reporter: hyoungjunkim
Priority: Minor
I ran the bellow query.
{code:sql}
select nation.n_nationkey as n_nationkey,
nation.n_name as n_name
from nation
inner join (select distinct c_nationkey as n_nationkey from customer) a
on nation.n_nationkey = a.n_nationkey
{code}
{noformat}
2014-04-07 10:52:26,419 ERROR
org.apache.tajo.master.querymaster.QueryMasterTask: Already Exists Field:
tpch100.a.n_nationkey
org.apache.tajo.catalog.exception.AlreadyExistsFieldException: Already Exists
Field: tpch100.a.n_nationkey
at org.apache.tajo.catalog.Schema.addColumn(Schema.java:287)
at org.apache.tajo.catalog.Schema.addColumn(Schema.java:299)
at org.apache.tajo.catalog.Schema.clone(Schema.java:330)
at org.apache.tajo.engine.utils.SchemaUtil.clone(SchemaUtil.java:66)
at
org.apache.tajo.engine.planner.global.DataChannel.setSchema(DataChannel.java:180)
at
org.apache.tajo.engine.planner.global.DataChannel.<init>(DataChannel.java:55)
at
org.apache.tajo.engine.planner.global.GlobalPlanner.createDataChannelFromJoin(GlobalPlanner.java:157)
at
org.apache.tajo.engine.planner.global.GlobalPlanner.buildJoinPlan(GlobalPlanner.java:258)
at
org.apache.tajo.engine.planner.global.GlobalPlanner.access$300(GlobalPlanner.java:55)
at
org.apache.tajo.engine.planner.global.GlobalPlanner$DistributedPlannerVisitor.visitJoin(GlobalPlanner.java:1006)
at
org.apache.tajo.engine.planner.global.GlobalPlanner$DistributedPlannerVisitor.visitJoin(GlobalPlanner.java:867)
at
org.apache.tajo.engine.planner.BasicLogicalPlanVisitor.visit(BasicLogicalPlanVisitor.java:81)
at
org.apache.tajo.engine.planner.BasicLogicalPlanVisitor.visitRoot(BasicLogicalPlanVisitor.java:133)
at
org.apache.tajo.engine.planner.global.GlobalPlanner$DistributedPlannerVisitor.visitRoot(GlobalPlanner.java:872)
at
org.apache.tajo.engine.planner.global.GlobalPlanner$DistributedPlannerVisitor.visitRoot(GlobalPlanner.java:867)
at
org.apache.tajo.engine.planner.BasicLogicalPlanVisitor.visit(BasicLogicalPlanVisitor.java:58)
at
org.apache.tajo.engine.planner.global.GlobalPlanner.build(GlobalPlanner.java:113)
at
org.apache.tajo.master.querymaster.QueryMasterTask.startQuery(QueryMasterTask.java:346)
at
org.apache.tajo.master.querymaster.QueryMasterTask.start(QueryMasterTask.java:167)
at
org.apache.tajo.master.querymaster.QueryMaster$QueryStartEventHandler.handle(QueryMaster.java:379)
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)
{noformat}
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