Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/19911
@danielvdende . I think your PR is able to replace the old way completely.
Could you try the followings?
1. Remove the old `isCascadingTruncateTable` from all Jdbc dialects.
2. Remove `isCascadingTrucateTable` check logic
3. `JdbcDialects.getTruncateQuery` throws `UnimplementedException`
4. All dialects implements `getTruncateQuery`
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