Logical operator should contains individual copy of schema object

                 Key: PIG-1127
                 URL: https://issues.apache.org/jira/browse/PIG-1127
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.4.0
            Reporter: Daniel Dai
            Assignee: Daniel Dai
             Fix For: 0.6.0

Currently some logical operator only contains a schema reference to the 
predecessor's schema object. These logical operators include: LOSplitOutput, 
LOLimit, LOSplit, LOFilter, LOSort, LODistinct, LOUnion. It is ok in the before 
because we do not change schema object once it is set. Now with the column 
pruner (PIG-922), we need to change individual schema object so it is no longer 
acceptable. For example, the following script fail:

a = load '1.txt' as (a0, a1:map[], a2);
b = foreach a generate a1;
c = limit b 10;
dump c;

We need to fix it.

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