Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/231#issuecomment-67810694
While I'm testing, I feel that this work needs some documentation. Could
you add its documentation? Of course, I can find some semantic definition and
read examples in unit tests. But, it still requires documentation for users and
testers. In addition, we may mark it as 'experimental feature' in the
documentation.
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