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https://issues.apache.org/jira/browse/SPARK-17474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477985#comment-15477985
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Apache Spark commented on SPARK-17474:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/15030
> expressions of QueryPlan does not include those inside Option[Seq[Expression]]
> ------------------------------------------------------------------------------
>
> Key: SPARK-17474
> URL: https://issues.apache.org/jira/browse/SPARK-17474
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.2, 1.6.2, 2.0.0
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> Because of this bug, Python UDF will not work with ORDER BY and LIMIT.
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