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https://issues.apache.org/jira/browse/SPARK-8201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14578583#comment-14578583
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Qian, Shilei commented on SPARK-8201:
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I'll deal with this.
> conditional function: if
> ------------------------
>
> Key: SPARK-8201
> URL: https://issues.apache.org/jira/browse/SPARK-8201
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> We already have an If expression. Just need to register it in
> FunctionRegistry.
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