Github user srowen commented on the issue:
https://github.com/apache/spark/pull/22466
We should look at Spark documentation, and Hive, if any, to figure out what
the right behavior is here. Spark generally follows Hive. See
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-CreateTableCreate/Drop/TruncateTable
I think this is, further, conflating what `LOCATION` and `EXTERNAL` does. I
agree that external DB files shouldn't be deleted, but not simply those
specified by `LOCATION`. At least that is my understanding.
@yhuai or @cloud-fan or @clockfly might know more.
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