problem with lineage with double map redirection

                 Key: PIG-804
             Project: Pig
          Issue Type: Bug
            Reporter: Olga Natkovich
            Assignee: Pradeep Kamath

v1       = load     'data' as (s,m,l);
v2       = foreach  v1  GENERATE
                        s#'src_spaceid' AS vspaceid ;
v3       = foreach  v2  GENERATE
explain v3;

The last cast does not have a loader associated with it and as the result the 
script fails on the backend with the following error: "Received a bytearray 
from the UDF. Cannot determine how to convert the bytearray to string."

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