Flink SQL UDF（用户自定义函数）需要打包成JAR文件并上传到Flink集群中，这是因为Flink SQL需要对UDF进行序列化和反序列化操作，以便在分布式环境中使用。将UDF打包成JAR文件可以确保UDF的代码和依赖项一起传递，并且可以在多个任务之间共享。虽然将UDF打包成JAR文件可能会增加一些复杂性ÿ...

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