Pig generates incorrect schema for generated bags after FOREACH.

                 Key: PIG-723
                 URL: https://issues.apache.org/jira/browse/PIG-723
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.1.0
         Environment: Linux
$pig --version
Apache Pig version 0.1.0-dev (r750430)
compiled Mar 07 2009, 09:20:13

            Reporter: Dhruv M
            Priority: Critical

grunt> rf_src = LOAD 'rf_test.txt' USING PigStorage(',') AS (lhs:chararray, 
rhs:chararray, r:float, p:float, c:float);                            
grunt> rf_grouped = GROUP rf_src BY rhs;                                        
grunt> lhs_grouped = FOREACH rf_grouped GENERATE group as rhs, rf_src.(lhs, r) 
as lhs, MAX(rf_src.p) as p, MAX(rf_src.c) AS c;                
grunt> describe lhs_grouped;
lhs_grouped: {rhs: chararray,lhs: {lhs: chararray,r: float},p: float,c: float}

I think it should be:
lhs_grouped: {rhs: chararray,lhs: {(lhs: chararray,r: float)},p: float,c: float}

Because of this, we are not able to perform UNION on 2 sets because union on 
incompatible schemas is causing a complete loss of schema information, making 
further processing impossible.

This is what we want to UNION with:

grunt> asrc = LOAD 'atest.txt' USING PigStorage(',') AS (rhs:chararray, a:int); 
grunt> aa = FOREACH asrc GENERATE rhs, (bag{tuple(chararray,float)}) null as 
lhs, -10F as p, -10F as c;
grunt> describe aa;
aa: {rhs: chararray,lhs: {(chararray,float)},p: float,c: float}

If there is something wrong with what I am trying to do, please let me know.

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