猪hadoop在分裂中回归0

Question

我试图将H除以每行的AB。 H / AB在下面的线下方划分但产生了所有ZEROS。我真的很困惑。

sum_of_scores = FOREACH final_group GENERATE group AS id,
            SUM(s.AB) AS AB,
            SUM(s.H) AS H;


final_final = FOREACH sum_of_scores GENERATE $0 AS month_state, $1 AS AB, $2 AS H;

dump final_final

out_put = FOREACH final_final GENERATE month_state, (H / AB) AS score; 

dump out_put

Answer 1

似乎表达式(H / AB)正在使用整数除法，因此参数应该首先使用cast operators转换为float，例如。

Answer 2

要扩展上述答案，应将每一列显式转换为浮点数：

out_put = FOREACH final_final GENERATE month_state, (FLOAT)((FLOAT)H/(FLOAT)AB) AS score;