Stream.pull() creates a lazy pipeline. The compress and encrypt transforms don't run until you start iterating output. Each iteration pulls data through the pipeline on demand.
return CombinedStorage([db_storage, csv_storage])
。关于这个话题，搜狗输入法下载提供了深入分析
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if (arr[i-1] arr[i]) return 0;
But let’s be honest: how many people actually remember its syntax?