fn split_reference(
reference: &UnresolvedItemName,
) -> Option<(&Ident, Option<&Ident>)>Expand description
Split a reference as written into its object name and, when the reference is qualified, the namespace immediately preceding it.
A leading database qualifier (only SQL Server references carry one) is
dropped: mz_source_references records no database, so there is nothing to
match it against.