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https://issues.apache.org/jira/browse/SPARK-18637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706935#comment-15706935
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Apache Spark commented on SPARK-18637:
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User 'zhzhan' has created a pull request for this issue:
https://github.com/apache/spark/pull/16068
> Stateful UDF should be considered as nondeterministic
> -----------------------------------------------------
>
> Key: SPARK-18637
> URL: https://issues.apache.org/jira/browse/SPARK-18637
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Zhan Zhang
>
> If the annotation UDFType of a udf is stateful, it shoudl be considered as
> non-deterministic. Otherwise, the catalyst may optimize the plan and return
> the wrong result.
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