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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5325) Implement statistics providing ORC writer and reader interfaces
Date Mon, 30 Sep 2013 16:18:24 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13781975#comment-13781975
] 

Ashutosh Chauhan commented on HIVE-5325:
----------------------------------------

Left some comments on RB.

> Implement statistics providing ORC writer and reader interfaces
> ---------------------------------------------------------------
>
>                 Key: HIVE-5325
>                 URL: https://issues.apache.org/jira/browse/HIVE-5325
>             Project: Hive
>          Issue Type: New Feature
>    Affects Versions: 0.13.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>              Labels: orcfile, statistics
>             Fix For: 0.13.0
>
>         Attachments: HIVE-5325.1.patch.txt, HIVE-5325.2.patch.txt, HIVE-5325-java-only.1.patch.txt,
HIVE-5325-java-only.2.patch.txt
>
>
> HIVE-5324 adds new interfaces that can be implemented by ORC reader/writer to provide
statistics. Writer provided statistics is used to update table/partition level statistics
in metastore. Reader provided statistics can be used for reducer estimation, CBO etc. in the
absence of metastore statistics.



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