why the “DefaultMQPullConsumer::persistConsumerOffset4PullConsumer“ can not be used？

void DefaultMQPullConsumer::persistConsumerOffset4PullConsumer(const MQMessageQueue& mq) {
// impl->persistConsumerOffsetByResetOffset(mq);
}
this was comment out， After the application is restarted, how can I ensure no repeated consumption

Start by locating DefaultMQPullConsumer::persistConsumerOffset4PullConsumer and inspect its callers, including the commented persistConsumerOffsetByResetOffset path. Determine how pull-consumer offsets are expected to persist across an application restart and whether repeated consumption is intended. Done means the supported behavior and required change or usage are clearly established.

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