Source: Computational Materials Science, Volume 267
Фридрих Мерц. Фото: IMAGO / Peter Hartenfelser / Global Look Press
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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.
A typical branch bank setup might involve an IBM 1210 document