Apache pig 从Pig中选择所需的记录

我在c中做了一个a，b的cogroup，c的模式和输出如下。 c=a组乘以$1，b组乘以$1` *架构是{group:bytearray，a:{（）}，b:{（）}

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你的目标是什么？我想一个接一个地从C生成每个元组。我无法编辑这里的内容。

         c = {(1,2,3,4)} {(5,6,7,8),(9,10,11,12),(13,14,15,16)}

         Now, How do I generate B as below in Pig?
         1,2,3,4  Assume this is a Policy record
         5,6,7,8  Assume this is a Role1 record for the policy
         9,10,11,12  Assume this is a Role2 record for the policy
         13,14,15,16 Assume this is a Role3 record for the policy
         ##Appreciate the help and thankful for it.##