計數值 - 阿帕奇PIG

Question

我有下面的語句

Values = FILTER Input_Data BY Fields > 0 

如何算的過濾，不是記錄的數目？

Answer 1

-- split into 2 datasets 
SPLIT Input_data INTO A IF Field > 0, B if Field <= 0; 

-- count > 0 records 
A_grp = GROUP A ALL; 
A_count = FOREACH A_grp GENERATE COUNT(A); 

-- count <= 0 records 
B_grp = GROUP B ALL; 
B_count = FOREACH B_grp GENERATE COUNT(B); 

希望這會有所幫助！