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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5562) Provide stripe level column statistics in ORC
Date Fri, 08 Nov 2013 20:08:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817637#comment-13817637
] 

Gunther Hagleitner commented on HIVE-5562:
------------------------------------------

Committed to trunk. Thanks [~prasanth_j] and [~owen.omalley]!

> Provide stripe level column statistics in ORC
> ---------------------------------------------
>
>                 Key: HIVE-5562
>                 URL: https://issues.apache.org/jira/browse/HIVE-5562
>             Project: Hive
>          Issue Type: New Feature
>          Components: File Formats
>    Affects Versions: 0.13.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>              Labels: orcfile
>             Fix For: 0.13.0
>
>         Attachments: HIVE-5562.1.patch.txt, HIVE-5562.2.patch.txt
>
>
> ORC maintains two levels of column statistics. Index statistics (for every rowgroup)
and file level column statistics for the entire file. It is useful to have stripe level column
statistics which will be intermediate to index and file statistics. The reason to maintain
stripe level statistics is that, the current input split computation logic is based on stripe
boundaries. So if stripe level statistics are available and if a stripe doesn't satisfy a
predicate condition then that entire stripe (also split) can be eliminated from split computation.



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