presto-spi/src/main/java/io/prestosql/spi/block/AbstractVariableWidthBlock.java/AbstractVariableWidthBlock/writeBytesTo
class AbstractVariableWidthBlock:    @Override
    public void writeBytesTo(int position, int offset, int length, BlockBuilder blockBuilder)
    {
        checkReadablePosition(position);
        blockBuilder.writeBytes(getRawSlice(position), getPositionOffset(position) + offset, length);
    }