presto-tpcds/src/main/java/io/prestosql/plugin/tpcds/TpcdsRecordSet.java/TpcdsRecordSet/advanceNextPosition
class TpcdsRecordSet:        @Override
        public boolean advanceNextPosition()
        {
            if (closed || !rows.hasNext()) {
                closed = true;
                row = null;
                return false;
            }

            row = rows.next().get(0);
            return true;
        }