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https://issues.apache.org/jira/browse/SPARK-21499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095931#comment-16095931
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Apache Spark commented on SPARK-21499:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/18700

> Support creating persistent function for Spark 
> UDAF(UserDefinedAggregateFunction)
> ---------------------------------------------------------------------------------
>
>                 Key: SPARK-21499
>                 URL: https://issues.apache.org/jira/browse/SPARK-21499
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Xiao Li
>            Assignee: Xiao Li
>
> Support creating persistent functions for Spark 
> UDAF(UserDefinedAggregateFunction)
> For example,
> {noformat}
> CREATE FUNCTION myDoubleAvg AS 'test.org.apache.spark.sql.MyDoubleAvg'
> {noformat}



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