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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4246) Implement predicate pushdown for ORC
Date Wed, 14 Aug 2013 09:17:48 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739440#comment-13739440
] 

Gunther Hagleitner commented on HIVE-4246:
------------------------------------------

[~owen.omalley] The join1 test in the mini mr driver doesn't fail for me locally. I think
that's unrelated. But the TestRecordReaderImpl test failure seems legit.
                
> Implement predicate pushdown for ORC
> ------------------------------------
>
>                 Key: HIVE-4246
>                 URL: https://issues.apache.org/jira/browse/HIVE-4246
>             Project: Hive
>          Issue Type: New Feature
>          Components: File Formats
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>         Attachments: HIVE-4246.D11415.1.patch, HIVE-4246.D11415.2.patch, HIVE-4246.D11415.3.patch,
HIVE-4246.D11415.3.patch, HIVE-4246.D11415.4.patch
>
>
> By using the push down predicates from the table scan operator, ORC can skip over 10,000
rows at a time that won't satisfy the predicate. This will help a lot, especially if the file
is sorted by the column that is used in the predicate.

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