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SparkSQL简单使用-骑猪去旅行
source link: http://blog.51cto.com/songqinglong/2083761
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==>什么是SparkSQL？--->SparkSQL是Spark用来处理结构化数据的一个模块--->作用：提供一个编程抽象（DataFrame）并且作为分布式SQL查询引擎--->运行原理：将SparkSQL转化为RDD，然后提交到集群执行--->特点：----容易整合----统一的数据访问方式----兼容Hive----标准的数据连接----==>DataFrames组织成命名列的数据集，等同
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