cloud-fan commented on issue #25206: [SPARK-28265][SQL] Add renameTable to TableCatalog API URL: https://github.com/apache/spark/pull/25206#issuecomment-513532914 > but we do need to decide whether to require that both identifiers start with the same catalog A similar problem was already discussed before and the decision was: RENAME TABLE should only do rename, not things like moving databases. As a result, the `ExternalCatalog.renameTable` is defined as `def renameTable(db: String, oldName: String, newName: String): Unit`. We can also enforce it at the parser level: `ALTER TABLE multiPartName RENAME TO singlePartName`. We didn't do it before for backward compatibility reasons, it's a good chance to do it for DS v2 now.
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