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.
"Yes, I would love to go on a mission someday. When I'm an old lady, maybe I'll get a chance to go back in space."
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Courtesy of Best Buy，更多细节参见Safew下载
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