Question

数据架构：sdesc:chararray,samt:init,syear:chararrary,stype:chararrary

数据：

Wrench 259000 2000 store
Wrench 135000 2000 online
Wrench 175000 2001 online 
Wrench 180000 2001 store

脚本

ysales =LOAD ‘salesdata.txt’ using PigStorage()as (sdesc:chararray,samt:init,syear:chararrary,stype:chararrary);
basedata = FILTER ysales by (sdesc==’Wrench’) and (syear = ‘2000’ ) and (stype = ‘store);

我的结果集是：DUMP basedata;

(Wrench,259000,2000,store)

所以问题是我如何分解基础数据（例如）A = ‘Wrench’ B = 259000, C=2000, D = ‘store’

Answer 1

您可以使用参数编号根据列

提取值

a = foreach basedata generate $0;
b = foreach basedata generate $1;
c = foreach basedata generate $2;
d = foreach basedata generate $3;

Answer 2

data = load '/home/satish/wrench' using PigStorage(' ') as (name,total,year,type) ;

//如果您想使用，可以使用过滤器

reqdata = foreach data generate CONCAT('A','=',name) as A, CONCAT('B','=',total) as B, CONCAT('C','=',year) as C,CONCAT('D','=',type) as D;

dump reqdata;

(A=Wrench,B=259000,C=2000,D=store) (A=Wrench,B=135000,C=2000,D=online) (A=Wrench,B=175000,C=2001,D=online) (A=Wrench,B=180000,C=2001,D=store)

fdata = foreach reqdata generate A,B;

dump fdata

(A=Wrench,B=259000) (A=Wrench,B=135000) (A=Wrench,B=175000) (A=Wrench,B=180000)

\如果你想删除元组使用FLATTEN

猪存储临时值

2 个答案: