Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/529#issuecomment-101564504
Actually, our join algorithms are very old ones. We should have refactored
and optimized them, but we haven't. I appreciate your work. I like this change.
I'm not sure if you can do further work for this patch. So, I just created
another pull request with some modifications, more comments and removal of
unused methods.
https://github.com/apache/tajo/pull/567
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