Trait TwoPhaseIterator 

pub trait TwoPhaseIterator: Send {
    // Required methods
    fn matches(&mut self) -> bool;
    fn match_cost(&self) -> f32;
}

Two-phase verification for approximate scorers.

Used by phrase queries, geo distance queries, regex queries, and other scorers where the fast approximation (posting list intersection) produces a superset of true matches and each candidate needs expensive verification. See [[architecture-query-execution#Core Traits]].

Required Methods

fn matches(&mut self) -> bool

Verify that the current document (from the parent Scorer) truly matches. Called after the scorer’s next()/advance() positions on a candidate.

fn match_cost(&self) -> f32

Estimated cost of a single matches() call, relative to the cost of advance(). Used to order multiple two-phase scorers cheapest-first in conjunctions.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors