have a heap allocation.
I was curious to see if I could implement the optimal map-reduce solution he alludes to in his reply.
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Falls through to #GP
可以说：8月4日那天，骗子不是在盗钱，而是在“拿钥匙”；8月11日和13日才是真正“开门取钱”的阶段。
，这一点在谷歌中也有详细论述
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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