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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2015/09/12 21:24:45 UTC
[jira] [Commented] (SPARK-6548) stddev_pop and stddev_samp
aggregate functions
[ https://issues.apache.org/jira/browse/SPARK-6548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14742203#comment-14742203 ]
Reynold Xin commented on SPARK-6548:
------------------------------------
[~davies] the patch that's merged is not using the new aggregate interface, but the old one that is to be removed in 1.6?
> 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
> Fix For: 1.6.0
>
>
> 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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