Github user msannell commented on the pull request:
https://github.com/apache/spark/pull/6557#issuecomment-107735239
In my work, I haven't used spark-submit: I start R (or TERR), and
access SparkR from there.
Note that SPARKR_DRIVER_R defaults to "R", whereas my proposed
variable would default to "Rscript", which is a slightly different
application. I agree that it would be nice to find a way to unify
these.
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