異常：Some of types cannot be determined by the first 100 rows, please try again with sampling
將RDD轉爲DataFrame的方式有： 1. 將RDD轉換爲Row，之後創建dataframe rdd = stringCSVRDD.map(lambda p: Row(id=p[0], name=p[1], age=p[2], eyeColor=p[3])) df = spark.createDataFrame(rdd) 通過該方式創建dataframe，書寫簡單，字段類型通過前100條數據類
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