Enum QueryExpression 

pub enum QueryExpression {
    Scoring(ScoringExpression),
    Ranking(RankingExpression),
}

Universal query expression — the top level of every search request.

Scoring variants produce per-document scores via the Scorer pipeline. Ranking variants compose result sets (fusion, RRF). Type-safe nesting: Bool clauses accept only ScoringExpression, Fusion sources accept QueryExpression (enabling nested fusion).

See [[feature-rrf-retrievers]].

Variants

Scoring(ScoringExpression)

Per-document scoring query (BM25, kNN, bool, etc.).

Ranking(RankingExpression)

Result-set composition (fusion, RRF).

Implementations

impl QueryExpression

pub fn as_scoring(&self) -> Option<&ScoringExpression>

Extract the scoring expression, if this is a Scoring variant.

pub fn scoring_expressions(&self) -> Vec<&ScoringExpression>

Collect all scoring expressions from this query tree. For Scoring: returns the single expression. For Ranking(Fusion): recursively collects from all sources.

Trait Implementations

impl Clone for QueryExpression

fn clone(&self) -> QueryExpression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryExpression

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

Formats the value using the given formatter.

impl PartialEq for QueryExpression

fn eq(&self, other: &QueryExpression) -> 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 QueryExpression