Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
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04、从“它经济”到“我经济”在不确定的生活中，宠物给人类提供了一种稀缺的关系稳定性；对宠物好，其实也是在治愈那个长期承受压力、缺乏情绪出口的自己。因此，如今的宠物消费，更多是在给“我”的情绪价值买单。