Hyunsik Choi created TAJO-232:
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             Summary: Rename join operators and add other join operators to PhysicalPlanner
                 Key: TAJO-232
                 URL: https://issues.apache.org/jira/browse/TAJO-232
             Project: Tajo
          Issue Type: Improvement
          Components: physical operator
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.2-incubating


The current physical operators for join have different naming rules as follows:
 * LeftOuterHashJoin, FullOuterHashJoin, ...
 * HashSemiJoin, HashAntiJoin

This patch renames join operators with consistency as follows: 
 * {Algorithm}{Join Type}Join

For example, outer joins will have the following names:
 * HashLeftOuterJoin
 * MergeRightOuterJoin
 * HashFullOuterJoin

This patch adds other join algorithms (left semi/anti hash join) to physical operators and adds In-subquery clause and exists predicate to Tajo algebra.



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