Function max_string

src/expr/src/relation/func.rs:56–68

(datums: I)

// see https://timely.zulipchat.com/#narrow/stream/186635-engineering/topic/additional.20work/near/163507435

fn max_string<'a, I>(datums: I) -> Datum<'a>
where
    I: IntoIterator<Item = Datum<'a>>,
{
    match datums
        .into_iter()
        .filter(|d| !d.is_null())
        .max_by(|a, b| a.unwrap_str().cmp(b.unwrap_str()))
    {
        Some(datum) => datum,
        None => Datum::Null,
    }
}

fn max_datum<'a, I, DatumType>(datums: I) -> Datum<'a>
where