[TAJO-1249] Tajo should check if a file format given in DDL is supported.

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.10.0
• Assignee: DaeMyung Kang
• Reporter: DaeMyung Kang
• Created: 15/Dec/14 21:52
• Updated: 24/Dec/14 06:28
• Resolved: 24/Dec/14 06:12

Description

Currently Tajo just show NullPointException when can't understand file format
```c
default> create external table table1 ( id int, name text, score float, type text, mytime int, mytime2 date) using TEXT1 location 'file:/Users/charsyam/tajo/table';
ERROR: java.lang.NullPointerException
```
It is better to return using verficationstate