Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/22466
Regarding the potentially high cost of file listing, `CREATE DATABASE` is
not a frequent operation. The cost is high only if the target directory is
non-empty with many many files. We are blocking users from creating such a
database. Thus, the cost is not a big deal I think.
We need to list this behavior change in the SQL migration guide.
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