spark sql

　　session.createDataFrame(data, schema=None, samplingRatio=None, verifySchema=True)

       rdd转换为dataframe可以声明schema,也可以设置samplingRatio，让系统自己去猜测数据集的结构。（Error: Some of types cannot be determined by the first 100 rows, please try again with sampling）

2.

spark sql

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