Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14086
To identify further works, I'll rephrase your comments.
You means the case `SaveMode.Overwrite` should fail due to that current
Spark uses `statement.executeUpdate(s"DROP TABLE $table")`.
> Drop table will not drop the descendant tables, unless you explicitly
specify CASCADE. The behaviors of TRUNCATE depends on the vendors.
In this case, what you want in this PR is `truncate` option also should
fail in the same way. Right?
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