Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/161#issuecomment-57007572
I think that this feature should not depend on session variable. Session
variable works implicitly. Users can miss to check if the session variable is
enabled.
As a result, inadvertently, a user can lost his or her entire table by
```INSERT OVERWRITE``` clause.
I think that we should force users to manually use ```TRUNCATE``` statement
instead of using session variable.
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