Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21978
@gatorsmile and @cloud-fan, this adds catalog to `TableIdentifier` in
preparation for multi-catalog support. `TableIdentifier` continues to work
as-is to ensure that there are no behavior changes in code paths that do not
have catalog support. I've updated `UnresolvedRelation` to demonstrate how
migration to `CatalogTableIdentifier` will work.
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