TAJO-136: Broadcast join should be enabled. (hyunsik)
TAJO-59: Implement Char Datum Type. (jihoon)
TAJO-137: Unreleased resources and wrong allocation requests in TajoWorkerResourceManager. (hyoungjunkim via hyunsik)
TAJO-141: Set on demand as the default cluster mode. (hyunsik)
Merge branch 'master' of git://github.com/apache/incubator-tajo into outerjoin_1
Re-synchronize to original TAJO 30 August
Query analysis, validation and optimization for mult-block queries containing outer join