Github user danielvdende commented on the issue:
https://github.com/apache/spark/pull/20057
I've made some changes to the code; the hardcoded `false` value for
`cascade` in `JdbcDialects` is now replaced by a default value of
`isCascadingTruncateTable`. This is also the case for each individual dialect,
with a pattern match in the dialects for Postgres and Oracle, as they support
the cascading behaviour. Curious to hear your thoughts on this @dongjoon-hyun
@gatorsmile
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