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Posted to dev@hive.apache.org by "Harish Butani (JIRA)" <ji...@apache.org> on 2013/02/27 04:32:12 UTC

[jira] [Created] (HIVE-4080) Add Lead & Lag UDAFs

Harish Butani created HIVE-4080:
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             Summary: 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


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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