I have some data like this:RDD[(String, String)] = ((*key-1*, a), (*key-1*,b), (*key-2*,a), (*key-2*,c),(*key-3*,b),(*key-4*,d))and I want to group the data by Key, and for each group, add index fields to the groupmember, at last I can transform the data to below : RDD[(String, *Int*, String)] = ((key-1,*1*, a), (key-1,*2,*b), (key-2,*1*,a), (key-2,*2*,b),(key-3,*1*,b),(key-4,*1*,d))I tried to groupByKey firstly, then I got a RDD[(String, Iterable[String])], but I don't know how to use zipWithIndex function to each Iterable...thanks.
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