presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/RaptorNode.java/RaptorNode/map
class RaptorNode:        @Override
        public RaptorNode map(int index, ResultSet rs, StatementContext ctx)
                throws SQLException
        {
            return new RaptorNode(
                    rs.getInt("node_id"),
                    rs.getString("node_identifier"));
        }