Apache pig Pig中元组数组的解析

我正在努力改变

({(A1),(A2)},{(A1-002),(A2-046)},{(124,323)})

进入：

因此，对于第三个元素中的每一个，前两个元素按顺序配对。 我最初试着把它们都弄平，就像

a = FOREACH a GENERATE FLATTEN(first) AS first, FLATTEN(second) AS second, FLATTEN(third) AS third;

但这一秩序并未得到维护

非常感谢您的帮助。谢谢

a = FOREACH a GENERATE FLATTEN(first) AS first, FLATTEN(second) AS second, FLATTEN(third) AS third;