additionalKnownTables property
Additional tables (that haven't necessarily been added in a FROM clause
that are only visible in this scope).
This is commonly used for common table expressions, e.g a WITH foo AS (...) would add a result set foo into the additionalKnownTables of
the overall statement, because foo can now be selected.
Implementation
final Map<String, ResultSet> additionalKnownTables = CaseInsensitiveMap();