本篇主要介绍一下SparkSQL的使用方法，架构设计和代码分析(基于Spark1.2.0)。
第一章主要介绍SparkSQL的发展历程和性能的优化。
第二章主要介绍SparkSQL的使用方法。
第三章主要介绍SparkSQL的调优。
第四章将深入SparkSQL，分析其架构。
第五章将介绍SparkSQL的优化器Catalyst。
第六章将解析SparkSQL的各个模块。
第七章将推荐一些学习Spark的参考资料。
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截止到spark 2.0,spark-sql的优化器永远只会返回一个plan
据源代码所示，spark-sql的优化器永远只会返回一个plan，也就是说目前spark-sql只有逻辑优化，没有物理优化
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