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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// Nothing executes until iteration begins
size of a task) it can allocate storage for it in the stack frame of
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"It won't happen in two years, but we might be talking about 10 years for this to happen, and that's still a short period of time," he says.
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