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Date: Tue, 10 Feb 2015 07:31:36 +0000 (UTC)
From: "Ashutosh Chauhan (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Commented] (HIVE-9618) Deduplicate RS keys for
 ptf/windowing
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    [ https://issues.apache.org/jira/browse/HIVE-9618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313745#comment-14313745 ] 

Ashutosh Chauhan commented on HIVE-9618:
----------------------------------------

+1

> Deduplicate RS keys for ptf/windowing
> -------------------------------------
>
>                 Key: HIVE-9618
>                 URL: https://issues.apache.org/jira/browse/HIVE-9618
>             Project: Hive
>          Issue Type: Improvement
>          Components: PTF-Windowing
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Trivial
>         Attachments: HIVE-9618.1.patch.txt, HIVE-9618.2.patch.txt
>
>
> Currently, partition spec containing same column for partition-by and order-by makes duplicated key column for RS. For example, 
> {noformat}
> explain
> select p_mfgr, p_name, p_size, 
> rank() over (partition by p_mfgr order by p_name) as r, 
> dense_rank() over (partition by p_mfgr order by p_name) as dr, 
> sum(p_retailprice) over (partition by p_mfgr order by p_name rows between unbounded preceding and current row)  as s1
> from noop(on noopwithmap(on noop(on part 
> partition by p_mfgr 
> order by p_mfgr, p_name
> )))
> {noformat}
> "partition by p_mfgr order by p_mfgr, p_name" makes duplicated key columns like below
> {noformat}
> Reduce Output Operator
>     key expressions: p_mfgr (type: string), p_mfgr (type: string), p_name (type: string)
>     sort order: +++
>     Map-reduce partition columns: p_mfgr (type: string)
>     value expressions: p_size (type: int), p_retailprice (type: double)
> {noformat}


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