[jira] [Resolved] (HIVE-4126) remove support for lead/lag UDFs outside of UDAF args

["Ashutosh Chauhan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-4126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashutosh Chauhan resolved HIVE-4126.
------------------------------------

    Resolution: Fixed

Committed to branch. Thanks, Harish!
                
> remove support for lead/lag UDFs outside of UDAF args
> -----------------------------------------------------
>
>                 Key: HIVE-4126
>                 URL: https://issues.apache.org/jira/browse/HIVE-4126
>             Project: Hive
>          Issue Type: Bug
>          Components: PTF-Windowing
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>         Attachments: HIVE-4126.D9105.1.patch, HIVE-4126.D9105.2.patch
>
>
> Select Expressions such as 
> p_size - lead(p_size,1)
> are currently handled as non aggregation expressions done after all over clauses are evaluated.
> Once we allow different partitions in a single select list(Jira 4041), these become ambiguous. 
> - the equivalent way to do such things is either to use lead/lag UDAFs with expressions ( support added with Jira 4081)
> - stack windowing clauses with inline queries. select lead(r,1).. from (select rank() as r....)...

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