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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TAJO-286) Refactor TableDesc, TableMeta, and Fragment
Date Sat, 26 Oct 2013 04:32:30 GMT
Hyunsik Choi created TAJO-286:
---------------------------------

             Summary: Refactor TableDesc, TableMeta, and Fragment
                 Key: TAJO-286
                 URL: https://issues.apache.org/jira/browse/TAJO-286
             Project: Tajo
          Issue Type: Improvement
          Components: catalog
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.8-incubating


In the current implementation, TableDesc and TableMeta are implemented through interface and
its implementation. This is unnecessary abstraction. For simplicity, this patch removes interfaces
and merge them into the concrete classes.

In addition, TableDesc and TableMeta's role is ambiguous. This patch clarifies their roles
as follows:
 *  TableMeta contains usual physical information which is used in workers. 
 * TableDesc contains logical information about a table and others which are not used in workers.

As a result, I've moved TableStats and Schema from TableMeta to TableDesc. 

Besides, in the current implementation, Fragment also is subclassed of TableDesc. But, this
relationship is wrong. Fragment is independent one of TableDesc. This patch changes this relationship.
They are independent ones.




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