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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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