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ВсеОбществоПолитикаПроисшествияРегионыМосква69-я параллельМоя страна。关于这个话题，51吃瓜提供了深入分析
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.