[jira] [Created] (TAJO-2136) Optimizer transforms plans instead of modifying them.

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-2136:
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             Summary: Optimizer transforms plans instead of modifying them.
                 Key: TAJO-2136
                 URL: https://issues.apache.org/jira/browse/TAJO-2136
             Project: Tajo
          Issue Type: Improvement
          Components: Planner/Optimizer
            Reporter: Hyunsik Choi


Many bugs and inconsistent meta data of the Plan and MasterPlan representation 
are being caused by modification. We need to refactor the optimizer and rules 
to transform immutable data representation instead of modifying them.



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