[jira] [Created] (TAJO-2108) Refactor Schema to be immutable

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-2108:
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             Summary: Refactor Schema to be immutable
                 Key: TAJO-2108
                 URL: https://issues.apache.org/jira/browse/TAJO-2108
             Project: Tajo
          Issue Type: Improvement
          Components: Catalog
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.12.0


In order to make Schema to be simplified, we need to refactor it to be 
immutable object.



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