我试着做一个2列的划分，这是 COUNT 在清管器中：

a = LOAD 'file.csv' USING PigStorage(',') AS (ID:chararray, Name:chararray, Result:chararray)
b = filter a by $1=='123';
c = filter a by $1=='123' and $2='Win';
d = foreach (group b by $1) generate group as da_id, count(b) as total;
e = foreach (group c by $1) generate group as da_id, count(c) as total_wins;
f = join d by da_id, e by da_id;
g = foreach (group f by $0) generate group as da_id, f::total_wins/f::total as ratio;

但是，我得到了错误

Invalid field projection. Projected field [f::total_wins] does not exist in schema

有人能帮忙吗？