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https://issues.apache.org/jira/browse/SPARK-7778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14680491#comment-14680491
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Rakesh Chalasani commented on SPARK-7778:
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Hi SsuTing:
The aggregate expression interface has changed in 1.5 and the above PR is
obsolete. SPARK-6548 which is tracking this now is still open. I guess that is
a better place to keep track of it.
Rakesh
> Add standard deviation aggregate expression
> --------------------------------------------
>
> Key: SPARK-7778
> URL: https://issues.apache.org/jira/browse/SPARK-7778
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Rakesh Chalasani
>
> Add standard deviation aggregate expression over data frame columns.
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