异常：Some of types cannot be determined by the first 100 rows, please try again with sampling
将RDD转为DataFrame的方式有： 1. 将RDD转换为Row，之后创建dataframe rdd = stringCSVRDD.map(lambda p: Row(id=p[0], name=p[1], age=p[2], eyeColor=p[3])) df = spark.createDataFrame(rdd) 通过该方式创建dataframe，书写简单，字段类型通过前100条数据类
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