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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.
，这一点在safew官方版本下载中也有详细论述
芯片、算法、数据之外，“每一分算力背后的电力成本与碳排放”，才是真正的决胜点。
industrial buildup, and a huge increase in national mobility (brought on by