Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/71#issuecomment-48907516
Please see the following comments. I've just added the explanation about
the motivation, all modes, and an example.
https://github.com/apache/tajo/pull/71/files#diff-4f557feed9e12061e60da8dc979e7a5bR23
I hope that it's helpful for your understanding.
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