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.
Its recent trial of age checking software by Persona in the UK has attracted some scrutiny over the vendor's backing by an investment firm co-founded by Peter Thiel, boss of controversial US data firm Palantir.
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append again has to allocate a new backing store, this time of size，这一点在Line官方版本下载中也有详细论述