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From "He Yongqiang (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2600) Enable/Add type-specific compression for rcfile
Date Wed, 30 Nov 2011 04:45:40 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159817#comment-13159817
] 

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

I see. where can't we store there in the file header? is the compression codec for a specific
column fixed for a whole table/partition? If that is the case, we can just store those information
in file header, right? That will help us debug things.
                
> 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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