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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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Zhan Zhang updated SPARK-18637:
-------------------------------
    Component/s: SQL

> 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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