Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/tajo/pull/458#issuecomment-92155775
@jihoonson , I knew that 20 days ago. :) But, there was no way to implement
variance at that time, since TAJO-921 is not committed yet. As I mentioned my
first comment, we need to change.
Here, I need your guide how to reduce the redundancy. Is it proper to
compute STD_DEV first and square that?
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