我已经试了几天Pig了，现在还不太懂。我试着做一些简单的练习，但没有用。目标是创建一个记录，显示每个id每年的最大跑步次数。所以我从： A = LOAD 'pig/input/Batting.csv' using PigStorage(',') as (ID:int, year:int, stint:chararray, team:chararray, league:chararray, games:int, games_bat:int, atbat:int, runs:int); B = GROUP A by year; C = FOREACH B generate group, MAX(A.runs) as maxruns; 我以为在这之前一切都很顺利，但后来就完全搞砸了： D = JOIN A by year, C by year; E = FOREACH D generate group, D.(group, ID), maxruns; store E into 'batting_result'; 如果您有任何建议或想法，我们将不胜感激。