Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/634#issuecomment-122748423
@jinossy thanks for your review.
I've added ```clear()``` in ```put()``` method because I was considering
unexpected errors when the datum array of different length is put.
As you think, this may accompany large overhead. I will remove it after
some test.
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