[TAJO-287] Improve Fragment to be more generic

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.8.0
• Component/s: Physical Operator
• Assignee: Hyunsik Choi
• Reporter: Hyunsik Choi
• Created: 27/Oct/13 07:07
• Updated: 29/Oct/13 10:37
• Resolved: 29/Oct/13 10:26

Description

The current Fragment is only for a file. This patch improves Fragment to be more generic.

First of all, I've changed Fragment to an interface and the original Fragment to FileFragment respectively. FragmentProto is changed to contain a table name and a bytestring which contains an storage-dependent contents. Then, the added FragmentConvertor transforms FragmentProto to a specified Fragment instance. It would be very useful to represent various fragment types like a row range of Hbase and database tables.