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https://issues.apache.org/jira/browse/HIVE-4197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13608243#comment-13608243
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Alan Gates commented on HIVE-4197:
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bq. Stable sort issue seems to be an important one ...

Yeah, I hadn't thought about the point that even in ORDER BY our sort needs to 
be stable in order to give consistent results.  It sucks that we have to 
introduce a sort even in queries without an ORDER BY, but oh well.  I agree 
that FileName and FileOffset are a good proxy, as that will maintain stability 
in the sort.
                
> Bring windowing support inline with SQL Standard
> ------------------------------------------------
>
>                 Key: HIVE-4197
>                 URL: https://issues.apache.org/jira/browse/HIVE-4197
>             Project: Hive
>          Issue Type: Bug
>          Components: PTF-Windowing
>            Reporter: Harish Butani
>         Attachments: WindowingSpecification.pdf
>
>
> The current behavior defers from the Standard in several significant places.
> Please review attached doc; there are still a few open issues. Once we agree 
> on the behavior, can proceed with fixing the implementation.

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