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Date: Tue, 29 Nov 2011 18:45:43 +0000 (UTC)
From: "He Yongqiang (Commented) (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Commented] (HIVE-2600) Enable/Add type-specific compression
 for rcfile
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    [ https://issues.apache.org/jira/browse/HIVE-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159438#comment-13159438 ] 

He Yongqiang commented on HIVE-2600:
------------------------------------

That sounds good. but i did not find the code change to store/parse the block header.
                
> Enable/Add type-specific compression for rcfile
> -----------------------------------------------
>
>                 Key: HIVE-2600
>                 URL: https://issues.apache.org/jira/browse/HIVE-2600
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Processor, Serializers/Deserializers
>            Reporter: Krishna Kumar
>            Assignee: Krishna Kumar
>            Priority: Minor
>         Attachments: HIVE-2600.v0.patch, HIVE-2600.v1.patch
>
>
> Enable schema-aware compression codecs which can perform type-specific compression on a per-column basis. I see this as in three-parts
> 1. Add interfaces for the rcfile to communicate column information to the codec
> 2. Add an "uber compressor" which can perform column-specific compression on a per-block basis. Initially, this can be config driven, but we can go for a dynamic implementation later.
> 3. A bunch of type-specific compressors
> This jira is for the first part of the effort.

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