Spark SQL/DataFrame/DataSet操做（三）-----分組聚合groupBy

分組函數groupBy （1）分組計數 select address,count(1) from people group by address;  等價的算子以下函數 scala> peopleDF.show() +--------+---+--------+ | name|age| address| +--------+---+--------+ |zhangsan| 22| cheng

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