Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16330
> when running as a R package when the guideline is not to have anything
written to user's space (unless under tempdir)
@cloud-fan I think what @felixcheung wants is to create both metadata and
data files (derby and warehouse) in tempdir. However, if we do it by default,
the directoryies in tempdir might be removed. That means, all the metadata
could be gone without notice.
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