Function lag_lead_no_list

fn lag_lead_no_list<'a: 'b, 'b, I>(
    datums: I,
    callers_temp_storage: &'b RowArena,
    order_by: &[ColumnOrder],
    lag_lead_type: &LagLeadType,
    ignore_nulls: &bool,
) -> impl Iterator<Item = Datum<'b>>
where
    I: IntoIterator<Item = Datum<'a>>,

Like lag_lead, but doesn’t perform the final wrapping in a list, returning an Iterator instead.