hive collect_set【相关词_ hive collect set函数】

4. 上述用的到的 collect_set函数,有两个作用,第一个是去重,去除 group by后的重复元素, 第二个是形成一个集合,将 group by后属于同一组的第三列集合起来成为一个集合。与 c

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