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Date: Thu, 28 Feb 2013 18:23:12 +0000 (UTC)
From: "Ashutosh Chauhan (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12634348.1361935843963.359147.1362075792845@arcas>
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Subject: [jira] [Resolved] (HIVE-4080) Add Lead & Lag UDAFs
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     [ https://issues.apache.org/jira/browse/HIVE-4080?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashutosh Chauhan resolved HIVE-4080.
------------------------------------

    Resolution: Fixed

Committed to branch. Thanks, Harish!
                
> Add Lead & Lag UDAFs
> --------------------
>
>                 Key: HIVE-4080
>                 URL: https://issues.apache.org/jira/browse/HIVE-4080
>             Project: Hive
>          Issue Type: Bug
>          Components: PTF-Windowing
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>         Attachments: HIVE-4080.1.patch.txt, HIVE-4080.D8961.1.patch, HIVE-4080.D8961.2.patch, HIVE-4080.D8961.3.patch
>
>
> Currently we support Lead/Lag as navigation UDFs usable with Windowing.
> To be standard compliant we need to support Lead & Lag UDAFs.
> Will continue to support Lead/Lag UDFs as arguments to UDAFs when Windowing is in play. 
> Currently allow Lead/Lag expressions to appear in SelectLists even when they are not arguments to UDAFs. Support for this feature will probably be removed. Causes ambiguities when Query contains different partition clauses. Will provide more details with associated Jira to remove this feature.

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