assert!(rows.num_rows() > 0);
        assert!(array.len() > 0, "Empty array passed to FieldCursor");

impl RowValues {
    /// Create a new [`RowValues`] from `rows` and a `reservation`
    /// that tracks its memory. There must be at least one row
    ///
    /// Panics if the reservation is not for exactly `rows.size()`
    /// bytes or if `rows` is empty.
    pub fn new(rows: Arc<Rows>, reservation: MemoryReservation) -> Self {
        assert_eq!(
            rows.size(),
            reservation.size(),
            "memory reservation mismatch"
        );
        assert!(rows.num_rows() > 0);
        Self {
            rows,
            _reservation: reservation,
        }
    }
}

    pub fn new<A: CursorArray<Values = T>>(
        options: SortOptions,
        array: &A,
        reservation: MemoryReservation,
    ) -> Self {
        assert!(array.len() > 0, "Empty array passed to FieldCursor");
        let null_threshold = match options.nulls_first {
            true => array.null_count(),
            false => array.len() - array.null_count(),
        };

    fn is_eq_to_prev_row_in_prev_batch(&self, other: &Self) -> bool {
        assert_eq!(self.offset, 0);
        T::eq(
            &self.values,
            self.offset,
            &other.values,
            other.values.len() - 1,
        )
    }