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https://issues.apache.org/jira/browse/SPARK-8225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14579971#comment-14579971
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Reynold Xin commented on SPARK-8225:
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[~zhichao-li] I plan to do this one myself along with other trivial ones.
> 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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