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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3432) perform a map-only group by if grouping key matches the sorting properties of the table
Date Wed, 04 Nov 2015 06:42:28 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989010#comment-14989010
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Lefty Leverenz commented on HIVE-3432:
--------------------------------------

Doc note:  This added configuration parameter *hive.map.groupby.sorted* to HiveConf.java,
so it needs to be documented in the wiki.

* [Configuration Properties -- Query and DDL Execution | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]

HIVE-12325 changes the default value to true.

> perform a map-only group by if grouping key matches the sorting properties of the table
> ---------------------------------------------------------------------------------------
>
>                 Key: HIVE-3432
>                 URL: https://issues.apache.org/jira/browse/HIVE-3432
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>              Labels: TODOC10
>             Fix For: 0.10.0
>
>         Attachments: hive.3432.1.patch, hive.3432.2.patch, hive.3432.3.patch, hive.3432.4.patch,
hive.3432.5.patch, hive.3432.6.patch, hive.3432.7.patch, hive.3432.8.patch
>
>
> There should be an option to use bucketizedinputformat and use map-only group by. There
would be no need to perform a map-side aggregation.



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