Struct GraphMutation 

pub struct GraphMutation {
    pub vertices: Vec<VertexSet>,
    pub edges: Vec<EdgeSet>,
    pub deletes: Vec<VertexDelete>,
    pub edge_deletes: Vec<EdgeSet>,
}

Everything one sync round wants to apply to the graph.

Sinks apply this in three phases, in order:

1. all vertices (upserts), then
2. all edges (upserts) — so edges can reference nodes created above, and
3. all deletes — last, but with a per-key net-effect rule: a delete whose (label, id) was also upserted this round is suppressed (the upsert wins). This is what makes an in-place UPDATE safe: a changelog UPDATE emits UPDATE_BEFORE(id) + UPDATE_AFTER(id), and treating the BEFORE row as a blind delete would destroy the node the AFTER row just rewrote. A true delete (no matching upsert) still removes the node. See upserted_vertex_keys / surviving_delete_ids in sink.rs.

Fields

vertices: Vec<VertexSet>

edges: Vec<EdgeSet>

deletes: Vec<VertexDelete>

Nodes to remove (DETACH DELETE). Empty for append-only rounds; carries the DELETE rows of a changelog round (UPDATE_BEFORE is dropped, not deleted). Defaulting to empty keeps every existing producer of GraphMutation source-compatible.

edge_deletes: Vec<EdgeSet>

Relationships to remove: the changelog DELETE rows of an edge step, in EdgeSet shape (src, dst, and the edge_key_props that tell parallel edges apart). Applied in phase 3 with the vertex deletes and by the same rule — an edge also upserted this round survives — and a row whose src or dst is null (an equality delete that carries only the row’s key) cannot name its edge and is skipped, counted in the log.

Implementations

impl GraphMutation

pub fn is_empty(&self) -> bool

pub fn merge(&mut self, other: GraphMutation)

Concatenate another mutation into this one (pipeline steps compose).

Trait Implementations

impl Clone for GraphMutation

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GraphMutation

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

Formats the value using the given formatter.

impl Default for GraphMutation

fn default() -> Self

Returns the “default value” for a type.