@Override
        public int hashCode() {
            final long n = ((long) sourceTopics.hashCode() << 32) | (long) stateChangelogTopics.hashCode();
            return (int) (n % 0xFFFFFFFFL);
        }
Returns the topic names for any optimized source changelogs
streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java