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Posted to issues@spark.apache.org by "Michael Armbrust (JIRA)" <ji...@apache.org> on 2015/06/18 07:51:00 UTC

[jira] [Updated] (SPARK-6548) Adding stddev to DataFrame functions

     [ https://issues.apache.org/jira/browse/SPARK-6548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Armbrust updated SPARK-6548:
------------------------------------
    Shepherd: Michael Armbrust

> Adding stddev to DataFrame functions
> ------------------------------------
>
>                 Key: SPARK-6548
>                 URL: https://issues.apache.org/jira/browse/SPARK-6548
>             Project: Spark
>          Issue Type: Improvement
>          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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