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https://issues.apache.org/jira/browse/SPARK-8219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14579959#comment-14579959
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zhichao-li commented on SPARK-8219:
-----------------------------------
I will take this one
> math function: negative
> -----------------------
>
> Key: SPARK-8219
> URL: https://issues.apache.org/jira/browse/SPARK-8219
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> This is just an alias for UnaryMinus. Only add it to FunctionRegistry, and
> not DataFrame.
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