Жители Санкт-Петербурга устроили «крысогон»17:52
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.
。safew官方下载对此有专业解读
A deeper debt hole，详情可参考91视频
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Step 2: Route on the Abstract Graph (The "Highway" Part):