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As the rule described in https://cwiki.apache.org/confluence/display/Hive/OuterJoinBehavior, we can optimize the SQL Join by pushing down the Join predicate and Where predicate. Author: Cheng Hao <hao.cheng@intel.com> Closes #1015 from chenghao-intel/join_predicate_push_down and squashes the following commits: 10feff9 [Cheng Hao] fix bug of changing the join type in PredicatePushDownThroughJoin 44c6700 [Cheng Hao] Add logical to support pushdown the join filter 0bce426 [Cheng Hao] Pushdown the join filter & predicate for outer join |
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