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https://issues.apache.org/jira/browse/SPARK-16633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai resolved SPARK-16633.
------------------------------
Resolution: Fixed
Fix Version/s: 2.1.0
2.0.1
Issue resolved by pull request 14284
[https://github.com/apache/spark/pull/14284]
> lag/lead using constant input values does not return the default value when
> the offset row does not exist
> ---------------------------------------------------------------------------------------------------------
>
> Key: SPARK-16633
> URL: https://issues.apache.org/jira/browse/SPARK-16633
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Yin Huai
> Assignee: Yin Huai
> Priority: Critical
> Fix For: 2.0.1, 2.1.0
>
> Attachments: window_function_bug.html
>
>
> Please see the attached notebook. Seems lag/lead somehow fail to recognize
> that a offset row does not exist and generate wrong results.
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