NAME

       UR::DataSource::RDBMS::FkConstraintColumn - metadata about a data source's foreign keys

DESCRIPTION

       This class represents the column linkages that make up a foreign key.  Each instance has a column_name
       (the source, where the foreign key points from) and r_column_name (remote column name, where the fireign
       key points to), as well as the source and remote table names.