我使用以下代码行：

student = load 'test/Pig/student' using PigStorage(' ') as (name:chararray,roll:int);

result = load 'test/Pig/results' using PigStorage('\t') as (id:int,status:chararray);

passroll = FILTER result by status == 'pass';

 store passroll into 'test/Pig/passroll';

pass = load 'test/Pig/passroll/part-m-00000' using PigStorage(',') as (id:int,status:chararray);

 stupass = JOIN pass by id, student by roll;

studentname = FOREACH stupass GENERATE student::name;

举例说明 studentname 是给成绩优秀的学生命名的有及格的。
但是倒垃圾 studentname 正在发出警告 ACCESSING_NON_EXISTENT_FI ELD 19 time(s) .