Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14086
Thank you for attention, @gatorsmile .
BTW, this option is for the advanced users who knows their DB and the
limitation and powers of `TRUNCATE`.
The the following comment, I really like this point of views. And I'm sure
that DBAs will allow the use of this option to Spark Architect/Developer/Users
for the case they can do manually.
> DBAs should do it manually, instead of using the Spark SQL interface.
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