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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8435) Add identity project remover optimization
Date Thu, 20 Nov 2014 09:04:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14219148#comment-14219148
] 

Lefty Leverenz commented on HIVE-8435:
--------------------------------------

Doc note:  This adds configuration parameter *hive.optimize.remove.identity.project* to HiveConf.java,
so it needs to be documented in the wiki by the time 0.15.0 is released:

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

> Add identity project remover optimization
> -----------------------------------------
>
>                 Key: HIVE-8435
>                 URL: https://issues.apache.org/jira/browse/HIVE-8435
>             Project: Hive
>          Issue Type: New Feature
>          Components: Logical Optimizer
>    Affects Versions: 0.9.0, 0.10.0, 0.11.0, 0.12.0, 0.13.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Jesús Camacho Rodríguez
>              Labels: TODOC15
>             Fix For: 0.15.0
>
>         Attachments: HIVE-8435.02.patch, HIVE-8435.03.patch, HIVE-8435.03.patch, HIVE-8435.04.patch,
HIVE-8435.05.patch, HIVE-8435.05.patch, HIVE-8435.06.patch, HIVE-8435.07.patch, HIVE-8435.08.patch,
HIVE-8435.09.patch, HIVE-8435.1.patch, HIVE-8435.patch
>
>
> In some cases there is an identity project in plan which is useless. Better to optimize
it away to avoid evaluating it without any benefit at runtime.



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