CHAPTER 7
Spark SQL
Ease of use is one of the reasons Spark became popular. It provides a simpler programming model than Hadoop MapReduce for processing big data. However, the number of people who are fluent in the languages supported by the Spark core API is a lot smaller than the number of people who know the venerable SQL.
SQL is an ANSI/ISO standard language for working with data. It specifies an interface for not only storing, modifying and retrieving data, but also for analyzing data. SQL is a declarative language. It is much easier to learn and use compared to general-purpose programming languages such as Scala, Java and Python. However, ...
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