Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16330
hmm, this is actually an excellent point - this is more than metadata, it
could be data files for warehouse and so on. @gatorsmile @cloud-fan @shivaram
I think in this case all of these are more akin to running a library to
save your own data file into your user space. I'm not 100% sure how to
interpret this.
Here's the actual policy wording:
```
- Packages should not write in the usersâ home filespace, nor anywhere
else on the file system apart from the R sessionâs temporary directory (or
during installation in the location pointed to by TMPDIR: and such usage should
be cleaned up). Installing into the systemâs R installation (e.g., scripts to
its bin directory) is not allowed.
Limited exceptions may be allowed in interactive sessions if the package
obtains confirmation from the user.
```
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