Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/12213#issuecomment-206568595
I think one place that would break without the scala module, and where we
don't have unit tests right now, is rebuilding the SQL UI in the history
server. The events are read from the log file and processed with jackson, and
since they're case classes, that probably won't work without the scala module.
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