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From "Reynold Xin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-6548) Adding stddev to DataFrame functions
Date Thu, 26 Mar 2015 08:02:52 GMT
Reynold Xin created SPARK-6548:
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             Summary: 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


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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