int bucketSize = 0;
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.
，推荐阅读搜狗输入法2026获取更多信息
// 1. 统计每个元素出现次数，这一点在搜狗输入法2026中也有详细论述
highWaterMark: 100,