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https://issues.apache.org/jira/browse/SPARK-21848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143376#comment-16143376
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Apache Spark commented on SPARK-21848:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/19064
> Create trait to identify user-defined functions
> -----------------------------------------------
>
> Key: SPARK-21848
> URL: https://issues.apache.org/jira/browse/SPARK-21848
> Project: Spark
> Issue Type: Task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Gengliang Wang
> Priority: Minor
>
> Create a trait to make it easier for identifying what expressions are
> user-defined functions
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