“绝不能出现这边宣布全面脱贫，那边又出现规模性返贫”“巩固拓展脱贫攻坚成果是全面推进乡村振兴的底线任务”……
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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.
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