Struct Nbr 

pub struct Nbr {
    pub endpoint: u32,
    pub rank: i64,
    pub edge_id: EdgeId,
    pub delete_ts: u64,
}

Compact CSR edge entry.

Logical assembly of a HotNbr topology half and a ColdStamps timestamp half. Storage layers persist the halves separately and reassemble this record at API boundaries; the exact in-memory size follows the measured struct size.

The endpoint is the internal vertex ID of the neighbor. The rank is the edge multiplicity index (typically 0 for simple edges).

delete_ts is the deletion timestamp (Timestamp::MAX means alive), maintained as physical state for row-level reclaim decisions. create_ts lives in the EdgeTimestamps authority and is consulted on-demand for MVCC visibility; it is not stored inline.

Topology and properties are decoupled: the CSR entry carries only the topology (endpoint, rank, edge_id, timestamps). Edge properties are stored in a separate columnar store indexed by EdgeId — no prop_offset indirection is stored per edge.

Use Nbr::to_vertex_id to reconstruct the full VertexId at the API boundary.

Fields

endpoint: u32

rank: i64

edge_id: EdgeId

delete_ts: u64

Implementations

impl Nbr

pub fn new(endpoint: u32, rank: i64, edge_id: EdgeId) -> Nbr

Create a new alive edge (delete_ts = MAX means “not deleted”).

pub fn with_create_ts( endpoint: u32, rank: i64, edge_id: EdgeId, _create_ts: u64, ) -> Nbr

Create with explicit create timestamp (stored in the authority, not inline).

The returned Nbr carries only the topology and delete_ts; the caller must record create_ts in the EdgeTimestamps authority.

pub fn with_timestamps( endpoint: u32, rank: i64, edge_id: EdgeId, delete_ts: u64, ) -> Nbr

Create with explicit delete timestamp.

pub fn dead_gap() -> Nbr

Gap-fill sentinel for rebuilt rows: never alive at any timestamp.

Uses the unassignable edge id with an empty delete window, so an overrun scan reports absence instead of a ghost live edge. This is the only sanctioned filler for reserved primary slots; every CSR shape shares it.

pub fn hot(&self) -> HotNbr

Split the record into its hot topology half.

pub fn cold(&self) -> ColdStamps

Split the record into its cold timestamp half.

pub fn from_parts(hot: HotNbr, cold: ColdStamps) -> Nbr

Reassemble a record from its halves.

pub fn to_vertex_id(&self) -> VertexId

Reconstruct the full VertexId from the packed (endpoint, rank) pair.

The result is a 16-byte VertexId encoding (endpoint as i64, rank) in big-endian, matching the format produced by EdgeTable::edge_endpoint_key.

Trait Implementations

impl Clone for Nbr

fn clone(&self) -> Nbr

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Nbr

impl Debug for Nbr

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Eq for Nbr

impl PartialEq for Nbr

fn eq(&self, other: &Nbr) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Nbr