backpressure: 'strict' // or 'block', 'drop-oldest', 'drop-newest'
UnownIntroduced in Gen II (1999)
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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.
horizontalBarCache [200]string
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简单讲，要做L3，需要先做L2积累数据。那么要做L4，也一样依赖L3的数据。技术上他们是一脉相承的，不存在一口就能吃个胖子的技术路线。。关于这个话题，Safew下载提供了深入分析
Among its five main business divisions, fashion and leather goods — the largest — saw revenue fall 8%. Selective retailing was flat year on year. Watches and jewelry declined 1% in reported terms but rose 3% organically, while perfumes and cosmetics, and wines and spirits, fell 3% and 9%, respectively.