I have a file,like 1.txt:
1 2
1 3
1 4
1 5
1 6
1 7
2 4
2 5
2 7
2 9
I want to merge them,results like this
map（1->List（2，3，4，5，6，7）,2->List(4,5,7,9))
what should I do？。。
val file1=sc.textFile("1.txt")
val q1=file1.flatMap(_.split(' '))???，maybe I should change RDD[int] to
RDD[int,int]?
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