Struct PerHitExplain 

#[non_exhaustive]
pub struct PerHitExplain {
    pub id: u64,
    pub arm: SoftFallbackBranch,
    pub vector_rank: Option<u32>,
    pub text_rank: Option<u32>,
    pub graph_rank: Option<u32>,
    pub fused_score: f64,
    pub ce_score: Option<f64>,
    pub blended: f64,
}

0.8.8 EXP-OBS (Slice 5) — per-hit provenance + score breakdown. One entry per returned SearchHit, same order. *_rank is the 0-based rank the hit’s body held in that arm’s pre-fusion list (None = absent from that arm).

Derives Clone, Debug, PartialEq but not Eq — scores are f64.

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.

id: u64

arm: SoftFallbackBranch

Winning arm after RRF dedup (vector-first), == SearchHit.branch.

vector_rank: Option<u32>

text_rank: Option<u32>

graph_rank: Option<u32>

fused_score: f64

Raw RRF fused score AFTER recency reweight, BEFORE CE blend (the value ce_rerank normalizes). Faithful to the engine computation — downstream may normalize. (ADR §A.4 Q1: raw exposed; normalization deferred.)

ce_score: Option<f64>

In-pool cross-encoder score sigmoid(ce_logit) ∈ [0,1], == the returned SearchHit.ce_score; None outside the reranked pool / no-CE path.

blended: f64

Final blended score, == the returned SearchHit.score.

Trait Implementations

impl Clone for PerHitExplain

fn clone(&self) -> PerHitExplain

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PerHitExplain

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

Formats the value using the given formatter.

impl PartialEq for PerHitExplain

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for PerHitExplain