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https://issues.apache.org/jira/browse/SPARK-20349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970270#comment-15970270
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Apache Spark commented on SPARK-20349:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/17646
> ListFunctions returns duplicate functions after using persistent functions
> --------------------------------------------------------------------------
>
> Key: SPARK-20349
> URL: https://issues.apache.org/jira/browse/SPARK-20349
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.2, 2.1.0
> Reporter: Xiao Li
> Assignee: Xiao Li
>
> The session catalog caches some persistent functions in the FunctionRegistry,
> so there can be duplicates. Our Catalog API listFunctions does not handle it.
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