Function decode_fixed

arrow-row/src/fixed.rs:436–460

Decodes a `ArrayData` from rows based on the provided `FixedLengthEncoding` `T` # Safety `data_type` must be appropriate native type for `T`

(
    rows: &mut [&[u8]],
    data_type: DataType,
    options: SortOptions,
)

///
/// `data_type` must be appropriate native type for `T`
unsafe fn decode_fixed<T: FixedLengthEncoding + ArrowNativeType>(
    rows: &mut [&[u8]],
    data_type: DataType,
    options: SortOptions,
) -> ArrayData {
    let len = rows.len();

    let mut values = BufferBuilder::<T>::new(len);
    let (null_count, nulls) = decode_nulls(rows);

    for row in rows {
        let i = split_off(row, T::ENCODED_LEN);
        let value = T::Encoded::from_slice(&i[1..], options.descending);
        values.append(T::decode(value));
    }

    let builder = ArrayDataBuilder::new(data_type)
        .len(len)
        .null_count(null_count)
        .add_buffer(values.finish())
        .null_bit_buffer(Some(nulls));

    // SAFETY: Buffers correct length
    unsafe { builder.build_unchecked() }
}

/// Decodes a `PrimitiveArray` from rows
pub fn decode_primitive<T: ArrowPrimitiveType>(