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https://issues.apache.org/jira/browse/SPARK-2196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14037189#comment-14037189
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Takuya Ueshin commented on SPARK-2196:
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PRed: https://github.com/apache/spark/pull/1133
> Fix nullability of CaseWhen.
> ----------------------------
>
> Key: SPARK-2196
> URL: https://issues.apache.org/jira/browse/SPARK-2196
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Takuya Ueshin
>
> {{CaseWhen}} should use {{branches.length}} to check if {{elseValue}} is
> provided or not.
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