Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/1015#issuecomment-219206124
I don't know why the changes in already committed patches.
The key changes are
* Recap Fragment to have a consistent interface.
* Add FragmentSerdeHelper for user-defined fragment serialization and
deserialization
* Change fragment configuration properties in storage-default.xml. A
fragment and a fragment serde helper are specified for each tablespace like
below.
```
<property>
<name>tajo.storage.fragment.kind.file</name>
<value>org.apache.tajo.storage.fragment.FileFragment</value>
</property>
```
* Remove RowFile.
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