hadoop - How to group bag in pig -

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first have data , group 

a = load './test.txt' using pigstorage(' ') (id:int, time:int, value:float);  b = group time;

for example result have structure this.

1001    {(1,1001,0.2),(3,1001,0.3),(2,1001,0.3),(4,1001,0.6)}    1002    {(2,1002,0.5),(1,1002,0.3),(3,1002,0.1),(4,1002,0.6)}   1003    {(4,1003,0.2),(1,1003,0.8),(2,1003,0.4),(3,1003,0.5)}

but want 

1001     {(1,1001,0.2),(2,1001,0.3),(3,1001,0.3),(4,1001,0.6)} 1002     {(1,1002,0.3),(2,1002,0.5),(3,1002,0.1),(4,1002,0.6)}    1003     {(1,1003,0.8),(2,1003,0.4),(3,1003,0.5),(4,1003,0.2)}

use nested foreach

c = foreach b {           sort_by_id = order id;           generate group, sort_by_id ;               };

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