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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-835) Multiquery optimization does not handle the case where the map keys in the split plans have different key types (tuple and non tuple key type)
Date Tue, 09 Jun 2009 01:22:07 GMT

    [ https://issues.apache.org/jira/browse/PIG-835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717512#action_12717512

Hadoop QA commented on PIG-835:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 782790.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/77/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/77/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/77/console

This message is automatically generated.

> Multiquery optimization does not handle the case where the map keys in the split plans
have different key types (tuple and non tuple key type)
> ----------------------------------------------------------------------------------------------------------------------------------------------
>                 Key: PIG-835
>                 URL: https://issues.apache.org/jira/browse/PIG-835
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.2.1
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>             Fix For: 0.3.0
>         Attachments: PIG-835-v2.patch, PIG-835.patch
> A query like the following results in an exception on execution:
> {noformat}
> a = load 'mult.input' as (name, age, gpa);
> b = group a ALL;
> c = foreach b generate group, COUNT(a);
> store c into 'foo';
> d = group a by (name, gpa);
> e = foreach d generate flatten(group), MIN(a.age);
> store e into 'bar';
> {noformat}
> Exception on execution:
> 09/06/04 16:56:11 INFO mapred.TaskInProgress: Error from attempt_200906041655_0001_r_000000_3:
java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.pig.data.Tuple
>     at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:312)
>     at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:254)
>     at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:204)
>     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.hadoop.executionengine.physicalLayer.relationalOperators.PODemux.runPipeline(PODemux.java:248)
>     at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PODemux.getNext(PODemux.java:238)
>     at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.runPipeline(PigMapReduce.java:320)
>     at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.processOnePackageOutput(PigMapReduce.java:288)
>     at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:268)
>     at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:142)
>     at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:318)
>     at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)

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