Method isSingleRel

src/include/binder/query/query_graph.h:43–45

        return queryNodesSelector.count() + queryRelsSelector.count();
    }
    bool isSingleRel() const {
        return queryRelsSelector.count() == 1 && queryNodesSelector.count() == 0;
    }

    bool containAllVariables(const std::unordered_set<std::string>& variables) const;