connection information, and a mapping from the originalsourceTabledatabase table to the temporary tablesparkTablethat will be used in later SQL queries. The namesparkTableis used because this system runs an embedded Apache Spark, and is creating Spark SQL tables from the configuration...
https://spark.apache.org/sql/ SparkSQL的前身是Shark,它将 SQL 查询与 Spark 程序无缝集成,可以将结构化数据作为 Spark 的 RDD 进行查询。SparkSQL作为Spark生态的一员继续发展,而不再受限于Hive,只是兼容Hive。 Spark SQL在整个Spark体系中的位置如下: SparkSQL的架构图如下: Spark SQL对熟悉Spark的同学来说,...