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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4126) remove support for lead/lag UDFs outside of UDAF args
Date Fri, 08 Mar 2013 17:56:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13597337#comment-13597337
] 

Phabricator commented on HIVE-4126:
-----------------------------------

hbutani has commented on the revision "HIVE-4126 [jira] remove support for lead/lag UDFs outside
of UDAF args".

INLINE COMMENTS
  common/src/java/org/apache/hadoop/hive/conf/HiveConf.java:732 ok

REVISION DETAIL
  https://reviews.facebook.net/D9105

BRANCH
  HIVE-4126

ARCANIST PROJECT
  hive

To: JIRA, ashutoshc, hbutani

                
> 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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