Spark学习心得（一）：Spark RDD基本操做

1、RDD.fold和Scala.fold使用之间的差异java 1.Scala中fold的使用函数 val t1=Array(("C++", (1,"1")), ("Java", (2,"2")),("Java", (2,"2")), ("SQL", (3,"3")), ("Python", (4,"4"))) val rst=t1.foldLeft(("",0,""))((sum,obj)=>

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