Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22466
This is a behavior change and makes us different from Hive. However I can't
find a strong reason to do it. It's like importing a database, but we can't
automatically create table entries in the metastore when creating a database
with an existing location.
To me a more reasonable behavior is, fail earlier when creating a database
with an existing and non-empty location.
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