@Override protected void processDependencies(List<Span> spans) {
      aggregateLinks(spans).forEach(
        (midnight, links) -> writeDependencyLinks(storage, links, midnight));
      blockWhileInFlight();
    }
The current implementation does not include dependency aggregation. It includes retrieval of
pre-aggregated links, usually made via zipkin-dependencies
zipkin-storage/cassandra/src/test/java/zipkin2/storage/cassandra/ITCassandraStorage.java