Function mz_repr::stats::proto_datum_min_max_nulls

pub(crate) fn proto_datum_min_max_nulls(
    col: &<Option<Vec<u8>> as Data>::Col,
    validity: ValidityRef,
) -> (Vec<u8>, Vec<u8>, usize)

Returns the min, max, and null_count for the column of Datums.

Each entry in the column is a single Datum encoded as a ProtoDatum. The min and max and similarly returned encoded via ProtoDatum. If the column is empty, the returned min and max will be Datum::Null, otherwise they will never be null.

NB: Vec<u8> and Option<Vec<u8>> happen to use the same type for Col. It’s a bit odd to use the Option version for both, but it happens to work because the non-option version won’t generate any Nulls.