实时计算 Flink版行转列的相关内容

flink问题之在通过TableFunction实现行转列时Row一直是空如何解决

问题一：flink1.10 定义表时，把json数组声明成STRING类型的，查询出来是空可以通过以下步骤还原车祸现场： kafka topic: test_action kafka message: {"action": [{"actionID": "id001", "actionName": ...

Flink SQL提供了行转列的功能，可以通过使用`UNPIVOT`操作来实现

Flink SQL提供了行转列的功能，可以通过使用UNPIVOT操作来实现。UNPIVOT操作可以将行转换为列，它可以将一些列中的值逆规整到行上。例如，假设我们有一个数据表，其中包含id、name和score_math、score_english、score_science等列，我们可以使用以下S...

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Flink这样子的行转列的数据我一条id为445的过来但是其余的字段不想变成空有什么办法吗?

Flink这样子的行转列的数据我一条id为445的过来但是其余的字段不想变成空有什么办法吗？除了每个字段分开写入 ,STRING_AGG(distinct case when t3.id = 413 then t2.name end ) ,STRING_AGG(distinct case ...

请问flink有行转列的函数吗？

flink1.10在通过TableFunction实现行转列时，Row一直是空

我的业务场景，是想实现一个行转列的效果。然后通过自定义tableFunction来实现。在自定义tableFunction的时候，如果SQL中传入的是ARRAY类型，那么在eval方法接收到的就是Row[]，问题出在，Row[]中的数据获取不到，里面的元素都是NULL 通过下面的步骤和代码可还...

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更新时间 2024-02-27 11:01:58

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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

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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