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阿里云文档 2024-09-12

使用UDAF实现数据排序和聚合

本文提供了一个自定义聚合函数（UDAF），实现将多行数据合并为一行并按照指定列进行排序，并以居民用电户电网终端数据为例，介绍如何在实时计算控制台使用该函数进行数据聚合和排序。

文章 2024-08-22 来自：开发者社区

Flink SQL 在快手实践问题之Window TVF改进窗口聚合功能如何解决

问题一：Group Window Aggregate在Flink中有哪些局限性？ Group Window Aggregate在Flink中有哪些局限性？参考回答： Group Window Aggregate在Flink 1.12及更早版本中用于窗口聚合，但其存在两个主要局限性：一是语法不符合SQL标准，需要借助特殊窗口函数和窗口辅助函数；二是窗口...

阿里云文档 2024-08-05

窗口聚合

实时计算Flink版的窗口聚合支持老语法分组窗口聚合（Group Window Aggregation）和新语法窗口表值函数聚合（Window TVF Aggregation）两种形式。本文为您介绍窗口聚合新老语法详情、窗口表值函数和聚合语句无法合并的场景、以及新老语法对更新流的支持情况。

阿里云文档 2023-06-01

如何针对资讯聚合类业务场景搭建基于云消息队列Kafka版和实时计算Flink的实时数仓

本文介绍如何针对资讯聚合类业务场景搭建基于云消息队列 Kafka 版和实时计算Flink的实时数仓。

问答 2022-02-15 来自：开发者社区

Flink - 如何在多个任务槽中聚合和查询富接收器功能状态

我实现了一个rich sink函数，它根据调用的对象执行一些网络调用。我希望能够计算这些事件的一些元数据，这些事件由事件中包含的某些上下文信息（事件的batchID）键入，并将此元数据公开给外部系统。例如，事件如下所示：case class MyEvent(batchId: String, eventId: String, moreInformation: ...)class MySink(......

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实时计算Flink版

阿里云实时计算Flink版(Alibaba Cloud Realtime Compute)，完全兼容开源的Apache Flink，比开源性能提升2～3倍，提供了完整的告警、监控、日志的解决方案、提升开发效率且无运维成本，并有社区专家提供技术支持。

立即开通

产品控制台

产品文档

实时同步

MySQL 到 Hologres

Kafka 到 Hologres

功能对比

开源Flink对比

成本优化

作业自动调优