Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14086
Thank you for review, @srowen . Currently, the `truncate` option will be
ignored for other non-JDBC sources.
IMO, most of them is **file-based* sources, so they do not need this.
Indeed, DROP/CREATE is the best and robust solution, but, as you see the
example, this is a minor optimization for **good** benefit. We can not achieve
the benefit with `DROP`.
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