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https://issues.apache.org/jira/browse/TAJO-921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351574#comment-14351574
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Dongjoon Hyun commented on TAJO-921:
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+1. This functions are needed in many cases including TPC-DS query 17 and 39.
> Add STDDEV_SAMP and STDDEV_POP window functions
> -----------------------------------------------
>
> Key: TAJO-921
> URL: https://issues.apache.org/jira/browse/TAJO-921
> Project: Tajo
> Issue Type: Sub-task
> Components: function/udf, physical operator
> Reporter: Hyunsik Choi
> Fix For: window function
>
>
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