[
https://issues.apache.org/jira/browse/DRILL-665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14011694#comment-14011694
]
Jacques Nadeau commented on DRILL-665:
--------------------------------------
Fixed in c8a08c3
> Drill throw NPE or UnsupportedOperationException when case expression
> contains null value
> -----------------------------------------------------------------------------------------
>
> Key: DRILL-665
> URL: https://issues.apache.org/jira/browse/DRILL-665
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Assignee: Timothy Chen
> Attachments: DRILL-665-1.patch
>
>
> Hi Tim,
> Per discussion yesterday, we found Drill will throw NPE or
> UnsupportedOperationException when case expression contains null value.
> (null value is added for the optional 'else' branch).
> Q1:
> select case when n_nationkey < 100 then 100 end from cp.`tpch/nation.parquet`;
> java.lang.NullPointerException
>
> org.apache.drill.exec.planner.logical.DrillOptiq$RexToDrill.visitLiteral(DrillOptiq.java:330)
>
> ~[drill-java-exec-1.0.0-m2-incubating-SNAPSHOT-rebuffed.jar:1.0.0-m2-incubating-SNAPSHOT]
> ......
> Q2.
> select case when n_nationkey < 100 then n_name end from
> cp.`tpch/nation.parquet`;
> java.lang.UnsupportedOperationException: Unable to convert the value of null
> and type NULL to a Drill constant expression.
>
> org.apache.drill.exec.planner.logical.DrillOptiq$RexToDrill.visitLiteral(DrillOptiq.java:367)
>
> ~[drill-java-exec-1.0.0-m2-incubating-SNAPSHOT-rebuffed.jar:1.0.0-m2-incubating-SNAPSHOT]
> ......
> Our conclusion is Drill need create proper TypedNullConstant in DrillOptiq
> when the null value is associated with regular SQL type, or resolve to proper
> SQL typed null constant, in IExpressionTreeMaterializer.visitIfExpression. (
> case/if expression requires all the branches return the type of value).
--
This message was sent by Atlassian JIRA
(v6.2#6252)
