Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/6824#issuecomment-112470314
We don't have a developer guide yet for SparkR, but it design is pretty
similar to the PySpark. For example you can see this PR which added math
operations to SparkR
https://github.com/apache/spark/commit/50da9e89161faa0ecdc1feb3ffee6c822a742034
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