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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1132) Column Pruner issues in dealing with unprunable loader
Date Tue, 08 Dec 2009 02:11:18 GMT
Column Pruner issues in dealing with unprunable loader

                 Key: PIG-1132
                 URL: https://issues.apache.org/jira/browse/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 org.apache.pig.impl.logicalLayer.ProjectFixerUpper.visit(ProjectFixerUpper.java:262)
        at org.apache.pig.impl.logicalLayer.LOProject.visit(LOProject.java:404)
        at org.apache.pig.impl.logicalLayer.LOProject.visit(LOProject.java:58)
        at org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:67)
        at org.apache.pig.impl.plan.DepthFirstWalker.walk(DepthFirstWalker.java:50)
        at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
        at org.apache.pig.impl.logicalLayer.LOForEach.rewire(LOForEach.java:770)
        ... 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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