Add lazy decompress ability to RCFile
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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
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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