Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22466
yea, in Spark we conflate the two and treat a table as external if location
is specified.
However, Hive doesn't have external database, see:
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-Create/Drop/Alter/UseDatabase
I don't want to introduce unnecessary behavior difference from hive, and I
feel it's not very useful to have external database. Although your table files
can be in an existing folder, but LIST TABLES will not work.
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