实时计算 Flink版group 的相关内容

flink sql使用Group by，报错is not being grouped

有一个是用场景，select a,b,c from xxx group by a,b这时候会报错org.apache.calcite.sql.validate.SqlValidatorException: Expression 'c' is not being grouped，貌似不支持非group...

Flink CDC要求是每来一条输出一次结果，计算一个数值按照group id，有啥办法处理嘛？

Flink CDC要求是每来一条输出一次结果，计算一个数值按照group id，现在发现我一次发多条数据的时候，可能会触发一起计算，不是一条条的，有啥办法处理嘛？select id, count(1) over w as idcountfrom KafkaSourcewindow w as ( pa...

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Flink CDC我想使用滚动窗口我必须后面要加group by嘛？

Flink CDC我想使用滚动窗口我必须后面要加group by嘛？我本意是想拿到这个窗口中的所有字段值

Flink CDC中这个Group算子怎么单独设置并行度呢，用的Table api

请问flink 1.13.3支持group by按天指标聚合吗？在不使用watermark的情况下。

flink 1.13.3支持group by按天指标聚合吗？在不使用watermark的情况下。

请问下flink里有没有函数能够实现group concat

大家flink sql 选择 group-offset 新的group 会报错吗？

各位大佬 flink sql 里面窗口在group by 里面和在 FROM TABLE 后面有

各位大佬 flink sql 里面窗口在group by 里面和在 FROM TABLE 后面有什么区别吗？

有一个问题 flink cdc 使用sql 进行group by 录入的时候，长时间会造成内存溢出吗

请问在flink sql-client中进行做group by 聚合值统计的时候，流式查询时是怎么计

请问在flink sql-client中进行做group by 聚合值统计的时候，流式查询时是怎么计算的？是每次都把所有历史明细数据聚合一次吗？

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更新时间 2023-12-09 09:12:40

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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