pub fn empty() -> Self {
        RelationDesc {
            typ: RelationType::empty(),
            names: vec![],
        }
    }
/// Constructs a new `RelationDesc` that represents the empty relation
/// with no columns and no keys.
Constructs a new `RelationDesc` that represents the empty relation
with no columns and no keys.
Constructs a new ` RelationDesc ` that represents the empty relation with no columns and no keys .
pub fn empty() -> Self {
        RelationDesc {
            typ: RelationType::empty(),
            names: vec![],
        }
    }
pub fn empty ( ) -> Self { RelationDesc { typ : RelationType :: empty ( ) , names : vec ! [ ] , } }
Constructs a new `RelationDesc` that represents the empty relation
with no columns and no keys.
Constructs a new ` RelationDesc ` that represents the empty relation with no columns and no keys .