Yin Huai created SPARK-9301:
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             Summary: collect_set and collect_list aggregate functions
                 Key: SPARK-9301
                 URL: https://issues.apache.org/jira/browse/SPARK-9301
             Project: Spark
          Issue Type: Sub-task
            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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