【Mapreduce】利用单表关联在父子关系中求解爷孙关系

首先是有如下数据，设定左边是右边的儿子，右边是左边的父母

Tom Lucy
Tom Jack
Jone Lucy
Jone Jack
Lucy Mary
Lucy Ben
Jack Alice
Jack Jesse
Terry Alice
Terry Jesse
Philip Terry
Philip Alma
Mark Terry
Mark AlmaTom Lucy
Tom