Github user ykrips commented on the pull request:
https://github.com/apache/tajo/pull/216#issuecomment-61229439
Well, I did not remember who stated this technique. I feel that it may
comes for a need for separation of roles for DBA and programmer, or it may
comes for easier maintenance. At first, I would liked to add codes for sql
separations on catalog stores, but I added some codes for altering and deleting
databse objects because I prefer to automation on database schema modification.
Also, I found a similar document in a below link.
* http://www.javapractices.com/topic/TopicAction.do?Id=105
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