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