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https://issues.apache.org/jira/browse/SPARK-9296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14790663#comment-14790663
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Apache Spark commented on SPARK-9296:
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User 'JihongMA' has created a pull request for this issue:
https://github.com/apache/spark/pull/8778
> variance, var_pop, and var_samp aggregate functions
> ---------------------------------------------------
>
> Key: SPARK-9296
> URL: https://issues.apache.org/jira/browse/SPARK-9296
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
>
> A short introduction on how to build aggregate functions based on our new
> interface can be found at
> https://issues.apache.org/jira/browse/SPARK-4366?focusedCommentId=14639921&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14639921.
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