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https://issues.apache.org/jira/browse/SPARK-6548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai updated SPARK-6548:
----------------------------
    Summary: stddev_pop and stddev_samp aggregate functions  (was: Adding 
stddev to DataFrame functions)

> stddev_pop and stddev_samp aggregate functions
> ----------------------------------------------
>
>                 Key: SPARK-6548
>                 URL: https://issues.apache.org/jira/browse/SPARK-6548
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Reynold Xin
>              Labels: DataFrame, starter
>
> Add it to the list of aggregate functions:
> https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/functions.scala
> Also add it to 
> https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/GroupedData.scala
> We can either add a Stddev Catalyst expression, or just compute it using 
> existing functions like here: 
> https://github.com/apache/spark/commit/5bbcd1304cfebba31ec6857a80d3825a40d02e83#diff-c3d0394b2fc08fb2842ff0362a5ac6c9R776



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