presto-hive/src/main/java/io/prestosql/plugin/hive/GenericHiveRecordCursor.java/GenericHiveRecordCursor/getDouble
class GenericHiveRecordCursor:    @Override
    public double getDouble(int fieldId)
    {
        checkState(!closed, "Cursor is closed");

        validateType(fieldId, double.class);
        if (!loaded[fieldId]) {
            parseDoubleColumn(fieldId);
        }
        return doubles[fieldId];
    }