Enum Value 

pub enum Value {
    Node(Node),
    Edge(Edge),
    Property(PropertyValue),
    Literal(Literal),
    List(Vec<Value>),
    Path(Vec<PathElem>),
    Map(BTreeMap<String, Value>),
    Null,
}

Variants

Node(Node)

Edge(Edge)

Property(PropertyValue)

Literal(Literal)

List(Vec<Value>)

A list literal, collect() result, or a list-valued node/edge property read back from storage (PropertyValue::List converts to this, never a raw Value::Property(PropertyValue::List(_)) — see executor::property_value_to_value) — every existing list operation (indexing, size(), IN, UNWIND, …) pattern-matches on this variant specifically, not on a property-sourced list separately.

Path(Vec<PathElem>)

A named path (MATCH p = (a)-->(b) RETURN p) or a shortestPath() result — see Binding::Path’s docs (executor.rs) for how this gets assembled during MATCH evaluation.

Map(BTreeMap<String, Value>)

A map literal ({a: 1, b: 2}) — like List, a query-layer-only concept, never persisted as a PropertyValue (nothing in the grammar can construct a map literal to store as a node/edge property directly; a CREATE {...} prop map’s values are each evaluated and stored individually as their own scalar PropertyValue — see Executor::eval_props_to_values — a Value:: Map reaching there is a real error, not silently dropped). Its other main real use is as a date(...)/duration(...) construction function’s argument, e.g. date({year: 1984, month: 10, day: 11}) — see Executor::call_builtin. BTreeMap, not HashMap — canonical key order makes display/comparison deterministic without a separate sort step.

Null

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Value

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

Formats the value using the given formatter.