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Date: Tue, 15 Jan 2013 18:46:13 +0000 (UTC)
From: "Kevin Wilfong (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12627548.1358211001611.138827.1358275573002@arcas>
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References: <JIRA.12627548.1358211001611@arcas>
Subject: [jira] [Commented] (HIVE-3897) Add a way to get the
 uncompressed/compressed sizes of columns from an RC File
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    [ https://issues.apache.org/jira/browse/HIVE-3897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554126#comment-13554126 ] 

Kevin Wilfong commented on HIVE-3897:
-------------------------------------

https://cwiki.apache.org/confluence/display/Hive/RCFileCat
                
> Add a way to get the uncompressed/compressed sizes of columns from an RC File
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-3897
>                 URL: https://issues.apache.org/jira/browse/HIVE-3897
>             Project: Hive
>          Issue Type: New Feature
>    Affects Versions: 0.11.0
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>             Fix For: 0.11.0
>
>         Attachments: HIVE-3897.1.patch.txt
>
>
> The uncompressed, compressed size of each column of an RCFile is stored in the header of an RCFile block.  Currently, we have no convenient way to get at this data.  This would be useful for identifying where RCFile is doing a poor job of compression, so that we can better focus our efforts.
> RCFileCat seems like a logical tool to extend to add this.

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