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https://issues.apache.org/jira/browse/TAJO-923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14491787#comment-14491787
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ASF GitHub Bot commented on TAJO-923:
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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?
> Add VAR_SAMP and VAR_POP window functions
> -----------------------------------------
>
> Key: TAJO-923
> URL: https://issues.apache.org/jira/browse/TAJO-923
> Project: Tajo
> Issue Type: Sub-task
> Components: function/udf, physical operator
> Reporter: Hyunsik Choi
> Assignee: Dongjoon Hyun
> Fix For: window function
>
> Attachments: TAJO-923.patch
>
>
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