Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16330
Right, I was thinking of adding note into the API doc and we could add a
log too - to say when you call `sparkR.session()` it will create a metastore
and a warehouse location.
I think we still need to set `System.setProperty("derby.system.home"`
because that's where derby.log goes to, which is not user data but a log file.
What do you think - @gatorsmile @cloud-fan @shivaram ?
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