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https://issues.apache.org/jira/browse/TAJO-303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822156#comment-13822156
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Hyunsik Choi commented on TAJO-303:
-----------------------------------

In my opinion, Fragment and FileFragment don't need super-child class 
relationships, and proto types also don't need to have polymorphism-like 
relationships.

> Improve FragmentProto to be extendable
> --------------------------------------
>
>                 Key: TAJO-303
>                 URL: https://issues.apache.org/jira/browse/TAJO-303
>             Project: Tajo
>          Issue Type: Improvement
>    Affects Versions: 0.8-incubating
>            Reporter: Jihoon Son
>            Assignee: Jihoon Son
>         Attachments: TAJO-303.patch, TAJO-303_2.patch
>
>
> Fragment is designed to support various types of stores, and thus 
> FragmentProto should be designed considering the expandability.
> This issue will increase readability and productivity.



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