presto-spi/src/main/java/io/prestosql/spi/block/AbstractSingleRowBlock.java/AbstractSingleRowBlock/getObject
class AbstractSingleRowBlock:    @Override
    public <T> T getObject(int position, Class<T> clazz)
    {
        checkFieldIndex(position);
        return getRawFieldBlock(position).getObject(rowIndex, clazz);
    }