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https://issues.apache.org/jira/browse/SPARK-10641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14945412#comment-14945412
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Xiangrui Meng commented on SPARK-10641:
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Btw, I checked the implementation of StdDevAgg. I'm not sure we can get benefit
from using expressions (and hence codegen). See
https://issues.apache.org/jira/browse/SPARK-10953.
> skewness and kurtosis support
> -----------------------------
>
> Key: SPARK-10641
> URL: https://issues.apache.org/jira/browse/SPARK-10641
> Project: Spark
> Issue Type: New Feature
> Components: ML, SQL
> Reporter: Jihong MA
> Assignee: Seth Hendrickson
>
> Implementing skewness and kurtosis support based on following algorithm:
> https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Higher-order_statistics
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