实时计算 Flink版sql count 的相关内容

问答 2021-12-03 来自：开发者社区

Flink sql count 多个属性的问题

大家好: 我在flink官方文档上看到内置聚合函数count的函数头是这样的 count([all] Expression | distinct Expression1 [, Expression2]) 所以它应该可以对多个属性进行...

问答 2021-12-02 来自：开发者社区

Flink SQL是否支持Count Window函数？

今天遇到一个业务场景用到count window，查了下Flink官网目前Flink SQL只支持time window，问一下官方是否打算sql支持count window呢？如果没有计划的话，自己要如何实现？是否可以像flink 1.13引入的cumulate window写一个自定义窗口函数呢？谢谢！*来自志愿者整理的flink邮件归档

问答 2021-12-01 来自：开发者社区

flink sql 的 count(distinct )问题

各位大佬好，想问下flinksql里的count (distinct）默认是用哪种state保存的状态*来自志愿者整理的flink邮件归档

问答 2021-12-01 来自：开发者社区

flink sql count distonct 优化应该怎么办？

在SQL中，如果开启了 local-global 参数：set table.optimizer.agg-phase-strategy=TWO_PHASE; 或者开启了Partial-Final 参数：set table.optimizer.distinct-agg.split.enabled=true; set table.optimizer.distinct-agg.split.bucket-....

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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。

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实时同步

MySQL 到 Hologres

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功能对比

开源Flink对比

成本优化

作业自动调优