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https://issues.apache.org/jira/browse/SPARK-16633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15385411#comment-15385411
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Yin Huai commented on SPARK-16633:
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Seems this bug only affects cases that use a constant as the column put in
lag/lead.
> lag/lead 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
> Priority: Critical
> 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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