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Date: Fri, 25 Jul 2014 03:45:39 +0000 (UTC)
From: "Matt McCline (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12727202.1405382847908.42609.1406259939325@arcas>
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References: <JIRA.12727202.1405382847908@arcas>
Subject: =?utf-8?Q?[jira]_[Commented]_(HIVE-7405)_Vectorize_G?=
 =?utf-8?Q?ROUP_BY_on_the_Reduce-Side_(Part_1_=E2=80=93_Basic)?=
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    [ https://issues.apache.org/jira/browse/HIVE-7405?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D14074=
019#comment-14074019 ]=20

Matt McCline commented on HIVE-7405:
------------------------------------

(Note: This patch also contains the large changes for HIVE-7029 Vectorize R=
educeWork.)

> Vectorize GROUP BY on the Reduce-Side (Part 1 =E2=80=93 Basic)
> ------------------------------------------------------
>
>                 Key: HIVE-7405
>                 URL: https://issues.apache.org/jira/browse/HIVE-7405
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>         Attachments: HIVE-7405.1.patch
>
>
> Vectorize the basic case that does not have any count distinct aggregatio=
n.
> Add a 4th processing mode in VectorGroupByOperator for reduce where each =
input VectorizedRowBatch has only values for one key at a time.  Thus, the =
values in the batch can be aggregated quickly.


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