摘要: 转自:https://blog.csdn.net/weixin_37766087/article/details/100940409 说明 这篇文章是来自Hadoop Hive UDAF Tutorial - Extending Hive with Aggregation Functions:的不严 阅读全文
posted @ 2021-01-26 11:41 彬在俊 阅读(335) 评论(0) 推荐(0) 编辑
摘要: 1. usage of api document as @since 1.8+ IDEA出现错误: Usage of API documented as @since 1.8+ less… This inspection finds all usages of methods that have @ 阅读全文
posted @ 2021-01-26 11:23 彬在俊 阅读(463) 评论(0) 推荐(0) 编辑
摘要: UDF几个相关概念: UDF: one-to-one row mapping : upper substr【进来一行出去一行】 UDAF: Aggregation Many-to-one row mapping 比如sum/min【进来多行出去一行】 UDTF: Table-generating o 阅读全文
posted @ 2021-01-26 11:17 彬在俊 阅读(384) 评论(0) 推荐(0) 编辑