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https://issues.apache.org/jira/browse/TAJO-880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14038463#comment-14038463
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ASF GitHub Bot commented on TAJO-880:
-------------------------------------
Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/40#issuecomment-46645743
+1
The patch looks good to me.
> NULL in CASE clause occurs Exception.
> --------------------------------------
>
> Key: TAJO-880
> URL: https://issues.apache.org/jira/browse/TAJO-880
> Project: Tajo
> Issue Type: Bug
> Reporter: Hyoungjun Kim
> Assignee: Hyoungjun Kim
> Priority: Minor
>
> The following query which contains NULL type in CASE clause occurs Exception.
> {code:sql}
> select
> case when l_returnflag != 'R' then l_orderkey else null end
> from lineitem
> {code}
> {noformat}
> com.google.protobuf.ServiceException:
> org.apache.tajo.engine.planner.PlanningException: No matched operation for
> those types: type: INT4
> , type: NULL_TYPE
> at
> org.apache.tajo.engine.planner.ExprAnnotator.assertEval(ExprAnnotator.java:76)
> at
> org.apache.tajo.engine.planner.ExprAnnotator.getWidestType(ExprAnnotator.java:130)
> at
> org.apache.tajo.engine.planner.ExprAnnotator.visitCaseWhen(ExprAnnotator.java:349)
> at
> org.apache.tajo.engine.planner.ExprAnnotator.visitCaseWhen(ExprAnnotator.java:51)
> at
> org.apache.tajo.engine.planner.BaseAlgebraVisitor.visit(BaseAlgebraVisitor.java:163)
> at
> org.apache.tajo.engine.planner.ExprAnnotator.createEvalNode(ExprAnnotator.java:71)
> at
> org.apache.tajo.engine.planner.LogicalPlanPreprocessor.visitProjection(LogicalPlanPreprocessor.java:204)
> at
> org.apache.tajo.engine.planner.LogicalPlanPreprocessor.visitProjection(LogicalPlanPreprocessor.java:38)
> at
> org.apache.tajo.engine.planner.BaseAlgebraVisitor.visit(BaseAlgebraVisitor.java:55)
> at
> org.apache.tajo.engine.planner.LogicalPlanner.createPlan(LogicalPlanner.java:119)
> at
> org.apache.tajo.engine.planner.LogicalPlanner.createPlan(LogicalPlanner.java:109)
> at
> org.apache.tajo.master.GlobalEngine.createLogicalPlan(GlobalEngine.java:480)
> at
> org.apache.tajo.master.GlobalEngine.executeQuery(GlobalEngine.java:148)
> {noformat}
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