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https://issues.apache.org/jira/browse/SPARK-18637?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-18637:
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Assignee: Apache Spark
> 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
> Assignee: Apache Spark
>
> 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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