Bug in Schema comparison for casting

                 Key: PIG-669
                 URL: https://issues.apache.org/jira/browse/PIG-669
             Project: Pig
          Issue Type: Bug
         Environment: i686 i386 GNU/Linux

            Reporter: Araceli Henley

This is a bug int he Schema comparison for casting. This is a valid use of a 
cast in SUM,  the first and second arguments are a cast to a Bag with an int.

 ERROR 1045: Could not infer the matching function for 
org.apache.pig.builtin.SUM as multiple or none of them fit. Please use an 
explicit cast.

TEST: AggregateFunc_61 

A =LOAD '/user/pig/tests/data/types/DataAll' USING PigStorage() AS ( Fint:int, 
Flong:long, Fdouble:double, Ffloat:float, Fchar:chararray, 
Fchararray:chararray, Fbytearray:bytearray, Fmap:map[], Fbag:BAG{ t:tuple( 
name, age, avg ) }, Ftuple:( name:chararray, age:int, avg:float) );
X =FOREACH B GENERATE SUM ( ( BAG{tuple(int)} ) A.Fbag.age, ( BAG{tuple(int)} ) 
STORE X INTO '/user/pig/tests/results/araceli.1234465985/AggregateFunc_61.out' 
USING PigStorage();

Suggest you also try:
X =FOREACH B GENERATE SUM ( ( BAG{tuple(int)} ) A.Fbag.age, A.Fint ); 

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