Fix join in local mode
----------------------

                 Key: PIG-925
                 URL: https://issues.apache.org/jira/browse/PIG-925
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: 0.3.0
            Reporter: Daniel Dai
             Fix For: 0.4.0


Join is broken after LOJoin patch (Optimizer_Phase5.patch of 
[PIG-697|https://issues.apache.org/jira/browse/PIG-697). Even the simplest join 
script is not working under local mode:

eg:
a = load '1.txt';
b = load '2.txt';
c = join a by $0, b by $0;
dump c;

Caused by: java.lang.NullPointerException
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPackage.getNext(POPackage.java:206)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:231)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:191)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:231)
        at 
org.apache.pig.backend.local.executionengine.physicalLayer.counters.POCounter.getNext(POCounter.java:71)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:231)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore.getNext(POStore.java:117)
        at 
org.apache.pig.backend.local.executionengine.LocalPigLauncher.runPipeline(LocalPigLauncher.java:146)
        at 
org.apache.pig.backend.local.executionengine.LocalPigLauncher.launchPig(LocalPigLauncher.java:109)
        at 
org.apache.pig.backend.local.executionengine.LocalExecutionEngine.execute(LocalExecutionEngine.java:165)

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