[jira] [Created] (TAJO-1987) Add stream API to Projectable and refactor its usage codes

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-1987:
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             Summary: Add stream API to Projectable and refactor its usage codes
                 Key: TAJO-1987
                 URL: https://issues.apache.org/jira/browse/TAJO-1987
             Project: Tajo
          Issue Type: Sub-task
          Components: Planner/Optimizer
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
            Priority: Minor
             Fix For: 0.12.0


This patch is a trivial patch to add a stream API to Projectable and refactor 
its usage codes.



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