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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8926) Projections that only swap input columns are identified incorrectly as identity projections
Date Thu, 20 Nov 2014 17:51:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14219664#comment-14219664
] 

Ashutosh Chauhan commented on HIVE-8926:
----------------------------------------

To get Hive QA run on your patch, you need to attach it here and mark it "Patch Available"

> Projections that only swap input columns are identified incorrectly as identity projections
> -------------------------------------------------------------------------------------------
>
>                 Key: HIVE-8926
>                 URL: https://issues.apache.org/jira/browse/HIVE-8926
>             Project: Hive
>          Issue Type: Bug
>          Components: Logical Optimizer
>    Affects Versions: 0.15.0
>            Reporter: Jesús Camacho Rodríguez
>            Assignee: Jesús Camacho Rodríguez
>             Fix For: 0.15.0
>
>         Attachments: HIVE-8926.patch
>
>
> Projection operators that only swap the input columns in the tuples are identified as
identity projections, and thus incorrectly deleted from the plan by the _identity project
removal_ optimization.
> This bug was introduced in HIVE-8435.



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