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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 Tue, 29 Nov 2011 00:25:41 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13158968#comment-13158968
] 

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

The code changes look good. Just one small question: where is the input information that is
used to choose the column specific decompressor stored? In file or in hive metastore? I think
both are fine for hive, but i am not sure about other components, like hcatalog etc.


                
> 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
>
>
> 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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