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https://issues.apache.org/jira/browse/SPARK-9299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14964656#comment-14964656
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Jeff Zhang commented on SPARK-9299:
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Link with SPARK-6761 as they can share the same algorithm
> percentile and percentile_approx aggregate functions
> ----------------------------------------------------
>
> Key: SPARK-9299
> URL: https://issues.apache.org/jira/browse/SPARK-9299
> 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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