apache pig - Joining multiple relations using a common field in Pig not giving any output -


i have 2 relations r1 , r2.

grunt>describe r1; r1: {f1: chararray,ts: chararray}  grunt>describe r2; r2: {f2:chararray,ts: chararray}

i want join 2 relations on ts output this

(f1,f2)

this tried (did not find comments relevant case).

grunt>j = join r1 ts,r2 ts; grunt>o = foreach j generate concat(r1::f1,r2::f2); grunt>describe o; o: {chararray} grunt>dump o;

i not getting output on dump o. new pig please explain.

here data i'm using :

data1

 f1a    10  f1b    12

data2

 f2a    10  f2b    11  f2c    12

if run following script, produces expected result:

 grunt> = load 'data1' (f1:chararray, ts:int);  grunt> b = load 'data2' (f2:chararray, ts:int);   grunt> c = join ts, b ts;  grunt> describe c;  c: {a::f1: chararray,a::ts: int,b::f2: chararray,b::ts: int}   grunt> d = foreach c generate concat(f1, f2);  grunt> dump d  (f1af2a)  (f1bf2c)

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