Function all_eq

src/expr/src/interpret.rs:1371–1376

(
            iter: impl IntoIterator<Item = &'a ReprColumnType>,
            other: &ReprScalarType,
        )

    fn variadic_typecheck(func: &VariadicFunc, args: &[ReprColumnType]) -> bool {
        use VariadicFunc::*;
        fn all_eq<'a>(
            iter: impl IntoIterator<Item = &'a ReprColumnType>,
            other: &ReprScalarType,
        ) -> bool {
            iter.into_iter().all(|t| t.scalar_type == *other)
        }
        match func {
            Coalesce(_) | Greatest(_) | Least(_) => match args {
                [] => true,