You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: utf8_to.rs
    path of file: ./repos/polars/crates/polars-arrow/src/compute/cast
    
    the code of the file until where you have to start completion: use std::sync::Arc;

use polars_error::PolarsResult;
use polars_utils::slice::GetSaferUnchecked;
use polars_utils::vec::PushUnchecked;

use crate::array::*;
use crate::datatypes::ArrowDataType;
use crate::offset::Offset;
use crate::types::NativeType;

pub(super) const RFC3339: &str = "%Y-%m-%dT%H:%M:%S%.f%:z";

pub(super) fn utf8_to_dictionary_dyn<O: Offset, K: DictionaryKey>(
    from: &dyn Array,
) -> PolarsResult<Box<dyn Array>> {
    let values = from.as_any().downcast_ref().unwrap();
    utf8_to_dictionary::<O, K>(values).map(|x| Box::new(x) as Box<dyn Array>)
}

/// Cast [`Utf8Array`] to [`DictionaryArray`], also known as packing.
/// # Errors
/// This function errors if the maximum key is smaller than the number of distinct elements
/// in the array.
pub fn utf8_to_dictionary<O: Offset, K: DictionaryKey>(
    from: &Utf8Array<O>,
) -> PolarsResult<DictionaryArray<K>> {
    let mut array = MutableDictionaryArray::<K, MutableUtf8Array<O>>::new();
    array.try_extend(from.iter())?;

    Ok(array.into())
}

/// Conversion of utf8
pub fn utf8_to_large_utf8(from: &Utf8Array<i32>) -> Utf8Array<i64> {
    let data_type = Utf8Array::<i64>::default_data_type();
    let validity = from.validity().cloned();
    let values = from.values().clone();

    let offsets = from.offsets().into();
    // S
    
pub fn binary_to_binview<O: Offset>(arr: &BinaryArray<O>) -> BinaryViewArray {
    let buffer_idx = 0_u32;
    let base_ptr = arr.values().as_ptr() as usize;

    let mut views = Vec::with_capacity(arr.len());
    let mut uses_buffer = false;
    for bytes in arr.values_iter() {
        let len: u32 = bytes.len().try_into().unwrap();

        let mut payload = [0; 16];
        payload[0..4].copy_from_slice(&len.to_le_bytes());

        if len <= 12 {
            payload[4..4 + bytes.len()].copy_from_slice(bytes);
        } else {
            uses_buffer = true;
            unsafe { payload[4..8].copy_from_slice(bytes.get_unchecked_release(0..4)) };
            let offset = (bytes.as_ptr() as usize - base_ptr) as u32;
            payload[0..4].copy_from_slice(&len.to_le_bytes());
            payload[8..12].copy_from_slice(&buffer_idx.to_le_bytes());
            payload[12..16].copy_from_slice(&offset.to_le_bytes());
        }

        let value = View::from_le_bytes(payload);
        unsafe { views.push_unchecked(value) };
    }
    let buffers = if uses_buffer {
        Arc::from([arr.values().clone()])
    } else {
        Arc::from([])
    };
    unsafe {
        BinaryViewArray::new_unchecked_unknown_md(
            ArrowDataType::BinaryView,
            views.into(),
            buffers,
            arr.validity().cloned(),
            None,
        )
    }
}