If a schema (database) is registered in your workspace-level Hive metastore, dropping that schema using the CASCADE option causes all files in that schema location to be deleted recursively, regardless of the table type (managed or external).
If the schema is registered to a Unity Catalog metastore, the files for Unity Catalog managed tables are deleted recursively. However, the files for external tables are not deleted. You must manage those files using the cloud storage provider directly.
Therefore, to avoid accidental data loss, you should never register a schema in a Hive metastore to a location with existing data. Nor should you create new external tables in a location managed by Hive metastore schemas or containing Unity Catalog managed tables.
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