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.
3.最近一年销售收入在2亿元以上的企业，比例不低于3%。
，这一点在旺商聊官方下载中也有详细论述
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