@Override
        public int compare(final TopologyDescription.Subtopology subtopology1,
                           final TopologyDescription.Subtopology subtopology2) {
            if (subtopology1.equals(subtopology2)) {
                return 0;
            }
            return subtopology1.id() - subtopology2.id();
        }
Returns the topic names for any optimized source changelogs
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java