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https://issues.apache.org/jira/browse/SPARK-8225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14579967#comment-14579967
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zhichao-li commented on SPARK-8225:
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I will take this one
> math function: alias sign / signum
> ----------------------------------
>
> Key: SPARK-8225
> URL: https://issues.apache.org/jira/browse/SPARK-8225
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> Alias them in FunctionRegistry.
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