Method intersection

backend/src/git/search.rs:288–290

(&self, topic_paths: &[TopicPath])

impl Downset for RedisFetchDownSet {
    fn intersection(&self, topic_paths: &[TopicPath]) -> Result<HashSet<ExternalId>> {
        self.redis.intersection(self, topic_paths)
    }

    fn downset(&self, path: &TopicPath) -> HashSet<ExternalId> {
        self.client.downset(path).collect::<HashSet<ExternalId>>()