猪脚本输出

Question

我是猪脚本的新手并且遇到了以下的猪脚本。我理解前两行，但我没有从＆＃34; C = B组获得清晰度。＆＃34;有人可以解释一下代码吗？

A = LOAD ’page views’ AS (user, action, timespent, query term, ip addr, 
timestamp,estimated revenue, page info, page links);
B = FOREACH A generate user, estimated revenue;
C = GROUP B by user parallel 40;
D = FOREACH C
     E = ORDER B by estimated revenue;
     F = E.estimated revenue;
     GENERATE group, SUM(F);
ENDFOR
STORE D into ’L16out’;

提前致谢。