Hyunsik Choi created TAJO-286:
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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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