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https://issues.apache.org/jira/browse/SPARK-10129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14712439#comment-14712439
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Yanbo Liang commented on SPARK-10129:
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I'm working on it.
> math function: stddev_samp
> --------------------------
>
> Key: SPARK-10129
> URL: https://issues.apache.org/jira/browse/SPARK-10129
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Davies Liu
>
> Use the STDDEV_SAMP function to return the standard deviation of a sample
> variance.
> http://www-01.ibm.com/support/knowledgecenter/SSPT3X_3.0.0/com.ibm.swg.im.infosphere.biginsights.bigsql.doc/doc/bsql_stdev_samp.html
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