Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/426#issuecomment-85286436
Oh, I think it's ok. The revised test doesn't contain any comparisons of
elapsed times.
In addition, MemSortExec is executed only when there remains a sufficient
amount of memory.
Here is my +1, and I'll commit it shortly.
Thanks for your great work!
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