引言随着大数据技术的发展，流式处理已成为处理实时数据的关键技术之一。Apache Flink 是一个流行的开源流处理框架，它以其高性能、低延迟和强大的状态管理能力而著称。Flink SQL 是 Flink 提供的一种声明式的接口，用于处理实时数据流。本文将深入探讨 Flink SQL 的核心功能及其在实时计算中的应用。 Apache Flink 简介Ap...

文章 2024-03-07 来自：开发者社区

在 Apache Flink SQL 中，并没有内置的 GROUP_CONCAT 函数

在 Apache Flink SQL 中，并没有内置的 GROUP_CONCAT 函数。但是，您可以通过以下两种方式实现类似的功能：自定义聚合函数：您可以编写一个自定义的聚合函数来实现 GROUP_CONCAT 功能。这个函数将根据需要，将每个组中的值连接为一个字符串。下面是一个简单的示例代码： import ...

文章 2023-12-07 来自：开发者社区

Apache Flink的RabbitMQ connector使用的是`org.apache.flink:flink-sql-connector-rabbitmq`库

是的，Apache Flink的RabbitMQ connector使用的是org.apache.flink:flink-sql-connector-rabbitmq库。但是，你需要确保你的项目中包含了正确的依赖项，并且这些依赖项在你的类路径中。你提到的错误信息表明，Flink无法找到任何实现org.apache.flink.table....

文章 2023-12-07 来自：开发者社区

Apache Flink SQL目前还不支持直接解析JSON字符串并将其转换为预期的数据类型

Apache Flink SQL目前还不支持直接解析JSON字符串并将其转换为预期的数据类型。你可以在Flink SQL中使用STRING_TO_ARRAY函数将字符串转换为数组。以下是一个示例，展示了如何将字符串转换为数组： SELECT STRING_TO_ARRAY(JSON_QUERY('{"a":[{"c":"...

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