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Posted to dev@pig.apache.org by "Julien Le Dem (JIRA)" <ji...@apache.org> on 2012/06/06 00:26:23 UTC
[jira] [Commented] (PIG-2739) PyList should map to Bag
automatically in Jython
[ https://issues.apache.org/jira/browse/PIG-2739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13289793#comment-13289793 ]
Julien Le Dem commented on PIG-2739:
------------------------------------
This looks good to me.
Don't forget to update the comment right above the changed code:
{noformat}
// In jython, list need not be a bag of tuples, as it is in case of pig
// So we fail with cast exception if we dont find tuples inside bag
// This is consistent with java udf (bag should be filled with tuples)
{noformat}
> PyList should map to Bag automatically in Jython
> ------------------------------------------------
>
> Key: PIG-2739
> URL: https://issues.apache.org/jira/browse/PIG-2739
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.10.0, 0.11
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Attachments: PIG-2739-0.patch
>
>
> The following script does not work:
> {code}
> register 'util.py' using jython as util;
> A = load '1.txt' as (sentence:chararray);
> B = foreach A generate flatten(util.tokenize(sentence));
> dump B;
> {code}
> util.py
> {code}
> outputSchema("words:{(word:chararray)}")
> def tokenize(sentence):
> return sentence.split(' ')
> {code}
> Error message:
> org.apache.pig.backend.executionengine.ExecException: ERROR 2078: Caught error from UDF: org.apache.pig.scripting.jython.JythonFunction [Error executing function]
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:288)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:304)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:332)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:353)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:294)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:273)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:268)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:64)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
> at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)
> Caused by: java.io.IOException: Error executing function
> at org.apache.pig.scripting.jython.JythonFunction.exec(JythonFunction.java:122)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:262)
> ... 11 more
> Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 0: Cannot convert jython type (org.python.core.PyList) to pig datatype java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.pig.data.Tuple
> at org.apache.pig.scripting.jython.JythonUtils.pythonToPig(JythonUtils.java:113)
> at org.apache.pig.scripting.jython.JythonFunction.exec(JythonFunction.java:117)
> ... 12 more
> Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.pig.data.Tuple
> at org.apache.pig.scripting.jython.JythonUtils.pythonToPig(JythonUtils.java:69)
> ... 13 more
> The problem is Pig expects a tuple inside a list, which is unintuitive in Python.
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