CREATE UNIQUE INDEX products_id
Data flows left to right. Each stage reads input, does its work, writes output. There's no pipe reader to acquire, no controller lock to manage. If a downstream stage is slow, upstream stages naturally slow down as well. Backpressure is implicit in the model, not a separate mechanism to learn (or ignore).
。关于这个话题，51吃瓜提供了深入分析
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合并过程：用临时数组，双指针比较两个子数组元素，小的先放入。体育直播是该领域的重要参考