Spark 读取json字符串转为DataFrame

来源：https://stackoverflow.com/questions/39619782/how-to-read-in-memory-json-string-into-spark-dataframe

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先将字符串转为RDD，再由RDD转为DF。

From Spark SQL guide:

val otherPeopleRDD = spark.sparkContext.makeRDD(
"""{"name":"Yin","address":{"city":"Columbus","state":"Ohio"}}""" :: Nil)
val otherPeople = spark.read.json(otherPeopleRDD)
otherPeople.show()

This creates a DataFrame from an intermediate RDD (created by passing a String).