Flink 内置函数

转载：https://blog.csdn.net/u011707542/article/details/101013751?spm=1001.2101.3001.6650.3&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-3-101013751-blog-120987151.pc_relevant_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-3-101013751-blog-120987151.pc_relevant_default&utm_relevant_index=6

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来源： https://www.cnblogs.com/pengpenghuhu/p/16609123.html