@Override
        public String toString() {
            return "TopicsInfo{" +
                "sinkTopics=" + sinkTopics +
                ", sourceTopics=" + sourceTopics +
                ", repartitionSourceTopics=" + repartitionSourceTopics +
                ", stateChangelogTopics=" + stateChangelogTopics +
                '}';
        }
Returns the topic names for any optimized source changelogs
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java