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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-819) Add lazy decompress ability to RCFile
Date Sun, 01 Nov 2009 21:52:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772371#action_12772371
] 

Namit Jain commented on HIVE-819:
---------------------------------

will merge is the tests pass

> Add lazy decompress ability to RCFile
> -------------------------------------
>
>                 Key: HIVE-819
>                 URL: https://issues.apache.org/jira/browse/HIVE-819
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor, Serializers/Deserializers
>            Reporter: He Yongqiang
>            Assignee: He Yongqiang
>             Fix For: 0.5.0
>
>         Attachments: hive-819-2009-9-12.patch, hive-819-2009-9-21.patch
>
>
> This is especially useful for a filter scanning. 
> For example, for query 'select a, b, c from table_rc_lazydecompress where a>1;' we
only need to decompress the block data of b,c columns when one row's column 'a' in that block
satisfies the filter condition.

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