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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-747) Logical to Physical Plan Translation fails when temporary alias are created within foreach
Date Wed, 21 Oct 2009 01:17:59 GMT

     [ https://issues.apache.org/jira/browse/PIG-747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-747:
---------------------------

        Fix Version/s: 0.6.0
    Affects Version/s:     (was: 0.3.0)
                       0.4.0
               Status: Patch Available  (was: Open)

> 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: 0.4.0
>            Reporter: Viraj Bhat
>            Assignee: Daniel Dai
>             Fix For: 0.6.0
>
>         Attachments: physicalplan.txt, physicalplanprob.pig, PIG-747-1.patch
>
>
> 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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