Function encode_list_view

arrow-row/src/list.rs:368–398

Encodes the provided `GenericListViewArray` to `out` with the provided `SortOptions` `rows` should contain the encoded child elements

(
    data: &mut [u8],
    out_offsets: &mut [usize],
    rows: &Rows,
    opts: SortOptions,
    array: &GenericListViewArray<O>,
    shift: usize,
)

///
/// `rows` should contain the encoded child elements
pub fn encode_list_view<O: OffsetSizeTrait>(
    data: &mut [u8],
    out_offsets: &mut [usize],
    rows: &Rows,
    opts: SortOptions,
    array: &GenericListViewArray<O>,
    shift: usize,
) {
    let offsets = array.value_offsets();
    let sizes = array.value_sizes();

    out_offsets
        .iter_mut()
        .skip(1)
        .enumerate()
        .for_each(|(idx, offset)| {
            let size = sizes[idx].as_usize();
            let range = array.is_valid(idx).then(|| {
                // For empty lists (size=0), offset may be arbitrary and could underflow when shifted.
                // Use 0 as start since the range is empty anyway.
                let start = if size > 0 {
                    offsets[idx].as_usize() - shift
                } else {
                    0
                };
                start..start + size
            });
            let out = &mut data[*offset..];
            *offset += encode_one(out, rows, range, opts)
        });
}

/// Decodes a `GenericListViewArray` from `rows` with the provided `options`
///