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.
Израиль нанес удар по Ирану09:28
，这一点在safew官方版本下载中也有详细论述
Жители Санкт-Петербурга устроили «крысогон»17:52
Pakistan has bombed major cities in Afghanistan including the capital, Kabul, with Islamabad’s defence minister declaring that the hostile neighbours were in a state of “open war” as a cycle of retaliatory attacks escalated further.