Struct Divergence 

#[non_exhaustive]
pub struct Divergence {
    pub source_id: String,
    pub target_id: String,
    pub edge_type: String,
    pub valid_from: String,
    pub valid_to: String,
    pub weight: f64,
    pub branch_id: String,
}

One belief a holds that b does not (§15.4, 0.14.11, D-228).

Returned by Database::diff, one per edge key on which the two lineages disagree, ordered by that key. The fields describe a’s side; b’s side is diff(b, a), which is the same question asked the other way round.

branch_id is the interesting field

It is the lineage on a’s ancestry that actually holds this row, and it is what separates what this exploration concluded from what it still holds while the trunk moved on. When it equals a, the divergence is a’s own assertion. When it does not, a is retaining an ancestor’s belief that b no longer shares — which happens whenever b churned the key after a forked, and is exactly the case that makes “the divergence is the set of rows carrying the branch’s own id” false. See D-228 for the two shapes that break it.

No constructor, and no Eq

#[non_exhaustive] with nothing owed, for Branch’s reason: this type only ever travels outward and nothing public accepts one, so the attribute buys the additive field and takes nothing back.

weight is an f64, so Eq, Ord and Hash are not derivable. That is a real difference from EdgeBelief, which carries no weight and is compared as a canonical form by the snapshot suite. Ordering here comes from the query instead, on the edge key, so two diffs of the same pair are still directly comparable.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

source_id: String

The edge’s source concept.

target_id: String

The edge’s target concept.

edge_type: String

The edge’s type.

valid_from: String

When the asserted interval opens — part of the key, not of the belief.

valid_to: String

When a believes the interval closes, or the open sentinel.

weight: f64

The weight a believes.

branch_id: String

The lineage on a’s ancestry holding this row. See the type docs.

Trait Implementations

impl Clone for Divergence

fn clone(&self) -> Divergence

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Divergence

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

Formats the value using the given formatter.

impl PartialEq for Divergence

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Divergence

fn partial_cmp(&self, other: &Divergence) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Divergence