Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21978
@cloud-fan, that's fine with me since #17185 is already merged. Would this
conflict with #17185? We can just add a case that detects whether the first
identifier in the seq is a catalog when updating expressions.
This PR is just the start for adding catalog to table identifiers. None of
the SQL statements are modified in this PR on purpose: code paths will need to
be updated to support `CatalogTableIdentifier`. This introduces the class so we
can use type safety to ensure that `CatalogTableIdentifier` doens't leak into
the code paths that don't support it.
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