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