GitHub user afs opened a pull request:
https://github.com/apache/jena/pull/130
JENA-1156: add afn:stdev, afn:stdevp, afn:var, afn:stvarp
Standard deviation (sample and population) and variance aggregates.
This PR includes fixes to the grammar of ARQ (extended SPARQL) to handle
DISTINCT in custom aggregates. There is some consequential refactoring in the
SPARQL 1.1 grammar in the generated java code.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/afs/jena stats
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/jena/pull/130.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 #130
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