presto-spi/src/main/java/io/prestosql/spi/block/AbstractSingleMapBlock.java/AbstractSingleMapBlock/getObject
class AbstractSingleMapBlock:    @Override
    public <T> T getObject(int position, Class<T> clazz)
    {
        position = getAbsolutePosition(position);
        if (position % 2 == 0) {
            return getRawKeyBlock().getObject(position / 2, clazz);
        }
        else {
            return getRawValueBlock().getObject(position / 2, clazz);
        }
    }