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.
Tyrrells plans to give vegetable crisps the chop
，这一点在safew官方下载中也有详细论述
Continue reading...。heLLoword翻译官方下载对此有专业解读
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