Method validate

src/plan/hector.rs:1051–1054

(&mut self, extensions: &Collection<S, (P, V)>)

    }

    fn validate(&mut self, extensions: &Collection<S, (P, V)>) -> Collection<S, (P, V)> {
        let target = self.value.clone();
        extensions.filter(move |(_prefix, extension)| *extension == target)
    }
}

struct BinaryPredicateExtender<P, V>