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https://issues.apache.org/jira/browse/SPARK-9297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14964370#comment-14964370
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Jihong MA commented on SPARK-9297:
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I will work on this and prepare a PR using ImperativeAggregate interface.
> 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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