如何组成一个袋子

Question

我尝试了以下内容 -

C = FOREACH A GENERATE dataMap#'$key_name' AS C_ID, dataMap#'$key_name2' AS methodName, pool,time;
D = GROUP C BY (C_ID);
E = FOREACH D {
sorted = order C by time desc;
GENERATE group,C.methodName AS Flow ;
};
F = GROUP E BY (Flow);
G = FOREACH F {
GENERATE group,COUNT(E) AS FlowKount ;
};
STORE G INTO '$output' USING PigStorage();

但是我收到错误 - 使用包作为不支持的密钥

上述程序中与E对应的数据 -

c1 {(m1), (m2), (m3) }
c2 {(m1), (m2), (m3) }
c3 {(m2), (m1), (m3) }
c4 {(m1), (m2), (m3) }
c5 {(m2), (m1), (m3) }

我需要输出为 -

{(m1), (m2), (m3) } {(c1),(c2),(c4)} 3
{(m2), (m1), (m3) } {(c3),(c5)} 2

是 - methods，C_Ids和count

检查包含不同C_ID

的包中具有相同方法的重复流的类型

有人可以指导如何实现这个目标吗？