dongjoon-hyun commented on pull request #28316:
URL: https://github.com/apache/spark/pull/28316#issuecomment-619308571
Could you make a follow-up PR with the following?
```
// System preserved database should not exists in metastore. However
it's hard to guarantee it
// for every session, because case-sensitivity differs. Here we always
lowercase it to make our
// life easier.
.transform(_.toLowerCase(Locale.ROOT))
```
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