MongoDB 聚合框架：使用 Facet 实现分组计数和分页

{"facet":{"total":[{"count":"count"}],"rows":[{"skip":0},{"limit":3}]}} 转java内容：Aggregate aggregate = new Aggregate(Arrays.asList(Aggregates.facet(Facet.builder().addStage(Aggregates.count("count", "total")).addStage(Aggregates.skip(0)).addStage(Aggregates.limit(3)).build())));