Spark Programming Spark SQL
• To convert an RDD to a DataFrame using toDF, you need to import the implicit methods defined in the implicits object. createDataFrame The createDataFrame method takes two arguments, an RDD of Rows and a schema, and returns a DataFrame. abstraction • The schema for a dataset can be specified with an instance of StructType, which is a case class. • A StructType object contains a sequence ... ................
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