Method from

src/sql/src/func.rs:545–547

(n: UnmaterializableFunc)

impl From<UnmaterializableFunc> for Operation<HirScalarExpr> {
    fn from(n: UnmaterializableFunc) -> Operation<HirScalarExpr> {
        Operation::nullary(move |_ecx| Ok(HirScalarExpr::call_unmaterializable(n.clone())))
    }
}

impl From<UnaryFunc> for Operation<HirScalarExpr> {