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
标签：amp error: ted please frame ssi creat eterm spark sql