Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/7139#issuecomment-126778965
I think we can have multiple R packages in one zip. If I remember correctly
we just unzip the files in every executor (or spark-submit does this) and we
include that path into the `libPaths` in R. But to keep the changes separate
we could build two zips -- one containing just the base SparkR and the other
containing all the addon packages. If it'll make the code simpler we could put
the add-on packages in `lib/spark-packages` or something like that as well.
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