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.
Debugging this was interesting enough that I wrote a full separate blog about it, but I’ll summarize here.
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Identify SERP Features and Questions related to each
Овечкин продлил безголевую серию в составе Вашингтона09:40
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