public Set<String> getGroupTopicSet(String group) {
        if (group == null) {
            return Collections.emptySet();
        }
        ConsumeGroupInfo consumeGroupInfo = groupInfoMap.get(group);
        if (consumeGroupInfo != null) {
            return consumeGroupInfo.getTopicSet();
        }
        return Collections.emptySet();
    }
get subscribed topic set of group

@param group group name
@return subscribed topic set
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/nodemanage/nodeconsumer/ConsumerInfoHolder.java