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1order by 是全局排序,只会产生一个reduce; sort by 是分区内排序,会产生多个reduce; distribute by是对key进行分区,一般与sort by连用,如:over( distribute by A sort by B) 求助1:over(partition by A order by B) 和 over( distribute by A sort by B) 的区别是什么? 求助2:可否distribute by ,partition by,order by,sort by混用?例如over( distribute by A orderby B),或者over( partition by A sort B)。
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1但也不能发广告什么的哈