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From Jesús Camacho Rodríguez (JIRA) <j...@apache.org>
Subject [jira] [Updated] (HIVE-8435) Add identity project remover optimization
Date Tue, 28 Oct 2014 16:39:33 GMT

     [ https://issues.apache.org/jira/browse/HIVE-8435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesús Camacho Rodríguez updated HIVE-8435:
------------------------------------------
    Attachment: HIVE-8435.05.patch

I think the following fix is sound, although maybe it is not complete (it does not cover all
cases). It is based on some aux functions that were also introduced in https://issues.apache.org/jira/browse/HIVE-8625
.

> 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: Sergey Shelukhin
>         Attachments: HIVE-8435.02.patch, HIVE-8435.03.patch, HIVE-8435.03.patch, HIVE-8435.04.patch,
HIVE-8435.05.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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