Column Pruner issues in dealing with unprunable loader

                 Key: PIG-1132
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.4.0
            Reporter: Daniel Dai
            Assignee: Daniel Dai
             Fix For: 0.6.0

The following script fail:

a = load '1.txt' using BinStorage() as (a0, a1, a2);
b = foreach a generate a2, a0, a1;
c = foreach b generate a0, a2;
explain c;

Error message:
ERROR 2163: Error during fixing projections. Could not locate replacement 
column for column: 1 in the new predecessor        at 
        at org.apache.pig.impl.logicalLayer.LOProject.visit(
        at org.apache.pig.impl.logicalLayer.LOProject.visit(
        at org.apache.pig.impl.plan.PlanVisitor.visit(
        at org.apache.pig.impl.logicalLayer.LOForEach.rewire(
        ... 19 more

Also even we fix the exception, the result is wrong.

Thanks Thejas for finding a reproducible test case for PigLatin

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