Method partial_cmp

datafusion/core/src/physical_planner.rs:4386–4388

(&self, _other: &Self)

    // a schema, we can't derive `PartialOrd`, and we can't compare these.
    impl PartialOrd for NoOpExtensionNode {
        fn partial_cmp(&self, _other: &Self) -> Option<Ordering> {
            None
        }
    }

    impl UserDefinedLogicalNodeCore for NoOpExtensionNode {