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From "Viraj Bhat (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-747) Logical to Physical Plan Translation fails when temporary alias are created within foreach
Date Thu, 02 Apr 2009 18:49:13 GMT
Logical to Physical Plan Translation fails when temporary alias are created within foreach
------------------------------------------------------------------------------------------

                 Key: PIG-747
                 URL: https://issues.apache.org/jira/browse/PIG-747
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.3.0
            Reporter: Viraj Bhat
             Fix For: 0.3.0


Consider a the pig script which calculates a new column F inside the foreach as:
{code}
A = load 'physicalplan.txt' as (col1,col2,col3);

B = foreach A {
   D = col1/col2;
   E = col3/col2;
   F = E - (D*D);
   generate
   F as newcol;
};

dump B;
{code}

This gives the following error:
=======================================================================================================================================
Caused by: org.apache.pig.backend.hadoop.executionengine.physicalLayer.LogicalToPhysicalTranslatorException:
ERROR 2015: Invalid physical operators in the physical plan
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.LogToPhyTranslationVisitor.visit(LogToPhyTranslationVisitor.java:377)
        at org.apache.pig.impl.logicalLayer.LOMultiply.visit(LOMultiply.java:63)
        at org.apache.pig.impl.logicalLayer.LOMultiply.visit(LOMultiply.java:29)
        at org.apache.pig.impl.plan.DependencyOrderWalkerWOSeenChk.walk(DependencyOrderWalkerWOSeenChk.java:68)
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.LogToPhyTranslationVisitor.visit(LogToPhyTranslationVisitor.java:908)
        at org.apache.pig.impl.logicalLayer.LOForEach.visit(LOForEach.java:122)
        at org.apache.pig.impl.logicalLayer.LOForEach.visit(LOForEach.java:41)
        at org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:68)
        at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
        at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:246)
        ... 10 more
Caused by: org.apache.pig.impl.plan.PlanException: ERROR 0: Attempt to give operator of type
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.Divide multiple
outputs.  This operator does not support multiple outputs.
        at org.apache.pig.impl.plan.OperatorPlan.connect(OperatorPlan.java:158)
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan.connect(PhysicalPlan.java:89)
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.LogToPhyTranslationVisitor.visit(LogToPhyTranslationVisitor.java:373)
        ... 19 more
=======================================================================================================================================

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