我正在尝试从以下内容更改架构：

describe JOINED_WITH_PARENT;
JOINED_WITH_PARENT: {ROWS_TUPLES::id: chararray,ROWS_TUPLES::url: chararray,ROWS_TUPLES::score: chararray,ROWS_TUPLES::parentId: chararray,ROWS_TUPLES::title: chararray,ROWS_TUPLES::body: chararray,GROUPED_PARENT_ID::group: chararray,GROUPED_PARENT_ID::ROWS_TUPLES: {(id: chararray,url: chararray,score: chararray,parentId: chararray,title: chararray,body: chararray)}}

收件人：

JOINED_WITH_PARENT: {id: chararray,url: chararray,:score: parentId: chararray,title: chararray,body: chararray,group: chararray, answers: {(id: chararray,url: chararray,score: chararray,parentId: chararray,title: chararray,body: chararray)}}

我正考虑在连接了\u和\u parent的\u上执行foreach，并尝试以下操作，但语法似乎不正确。我走对了吗？任何帮助都将不胜感激

A = FOREACH JOINED_WITH_PARENT GENERATE 
   id as (id:chararray),
   score as (score:chararray),
   parentId as (parentId:chararray),
   title as (title:chararray),
   body as (body:chararray),
   group as (group:chararray),
   answers as tuple(chararray,chararray,chararray,chararray,chararray)GROUPED_PARENT_ID::ROWS_TUPLES;