Add run length encoding into RCFile's block header
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Key: HIVE-947
URL: https://issues.apache.org/jira/browse/HIVE-947
Project: Hadoop Hive
Issue Type: Improvement
Reporter: He Yongqiang
Assignee: He Yongqiang
Priority: Minor
When RCFile constructing rows, it needs to get column value's length via
calling readVLong(). And this should be avoided for fix length or most fix
length columns.
This also should not influence old rcfile files, which means it should also
work correctly on files with previous RCFile format.
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