DaeMyung Kang created TAJO-1249:
-----------------------------------
Summary: Tajo Should Check File Format is allowed.
Key: TAJO-1249
URL: https://issues.apache.org/jira/browse/TAJO-1249
Project: Tajo
Issue Type: Bug
Reporter: DaeMyung Kang
Assignee: DaeMyung Kang
Priority: Minor
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
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