presto-tpch/src/main/java/io/prestosql/plugin/tpch/TpchRecordSet.java/TpchRecordCursor/getLong
class TpchRecordCursor:        @Override
        public long getLong(int field)
        {
            checkState(row != null, "No current row");
            return getLong(getTpchColumn(field));
        }