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From "He Yongqiang (JIRA)" <>
Subject [jira] Created: (HIVE-819) Add lazy decompress ability to RCFile
Date Wed, 09 Sep 2009 03:43:58 GMT
Add lazy decompress ability to RCFile

                 Key: HIVE-819
             Project: Hadoop Hive
          Issue Type: Improvement
          Components: Query Processor, Serializers/Deserializers
            Reporter: He Yongqiang
             Fix For: 0.5.0

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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