GitHub user rakeshchalasani opened a pull request:
https://github.com/apache/spark/pull/6309
[SPARK-7778][SQL] Add standard deviation expression over data frame
The aggregate function implementation is based on online variance
calculation
http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
The partial evaluation is a naive variance computation.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rakeshchalasani/spark frameVariance
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/6309.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 #6309
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commit 887950e4eb85245c006c0469e038825e8e8e3d3f
Author: rakeshchalasani <[email protected]>
Date: 2015-05-21T03:07:30Z
Add standard deviation aggregate expression
commit 97a258a481ce9aa90233aa266022c9670d670079
Author: rakeshchalasani <[email protected]>
Date: 2015-05-21T03:07:39Z
Add python support
commit 52a8ac38349c4f97111eabe1fa8627482e12ac50
Author: rakeshchalasani <[email protected]>
Date: 2015-05-21T03:09:42Z
[SPARK-7778][SQL] Add standard deviation aggregate expression over data
frame columns.
Author: Rakesh Chalasani <[email protected]>
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