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https://issues.apache.org/jira/browse/SPARK-9297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15030882#comment-15030882
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Apache Spark commented on SPARK-9297:
-------------------------------------

User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/10029

> covar_pop and covar_samp aggregate functions
> --------------------------------------------
>
>                 Key: SPARK-9297
>                 URL: https://issues.apache.org/jira/browse/SPARK-9297
>             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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