【pig】foreach使用*代表所有fields

A = load 'foreach_input' as (user:chararray, id:long, address:chararray, phone:chararray);
--B = foreach A generate user, id;
B = foreach A generate user, id, 'good';
--describe A;
--describe B;
/*using '*' character*/
C = foreach A generate *;

describe C;

=====================================运行结果

C: {user: chararray,id: long,address: chararray,phone: chararray}