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.
FirstFT: the day's biggest stories
，这一点在同城约会中也有详细论述
Tiny Footprint: Our HH-Routing data adds only 0.5% to 1% to OsmAnd's already incredibly compact map sizes. The entire planet's car routing data is around 800MB!
Овечкин продлил безголевую серию в составе Вашингтона09:40