GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/8587
[SPARK-9298][SQL] Add pearson correlation aggregation function
JIRA: https://issues.apache.org/jira/browse/SPARK-9298
This patch adds pearson correlation aggregation function based on
`AggregateExpression2`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 corr_aggregation
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8587.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #8587
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commit cb34a95e3dea152250b6409827fc869bd7fae407
Author: Liang-Chi Hsieh <[email protected]>
Date: 2015-09-03T16:47:21Z
Add corr aggregate function.
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