Hive中提示Expression Not In Group By Key的解決辦法
問題出現的緣由：數組 1.Hive不容許直接訪問非group by字段； 2.對於非group by字段，能夠用Hive的collect_set函數收集這些字段，返回一個數組； 3.使用數字下標，能夠直接訪問數組中的元素；函數 MySQL中代碼：code select d.dname,count(*) num from emp e
join dept d on e.deptno=d.deptno
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