presto-kudu/src/main/java/io/prestosql/plugin/kudu/KuduRecordCursor.java/KuduRecordCursor/getDouble
class KuduRecordCursor:    @Override
    public double getDouble(int field)
    {
        int index = mapping(field);
        return TypeHelper.getDouble(columnTypes.get(field), currentRow, index);
    }