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https://issues.apache.org/jira/browse/PIG-3938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koji Noguchi updated PIG-3938:
------------------------------
Summary: Add LoadCaster to EvalFunc(UDF) (was: Type cast doesn't work
after flatten result of UDF)
> Add LoadCaster to EvalFunc(UDF)
> --------------------------------
>
> Key: PIG-3938
> URL: https://issues.apache.org/jira/browse/PIG-3938
> Project: Pig
> Issue Type: Bug
> Components: internal-udfs
> Affects Versions: 0.12.0, 0.11.1
> Reporter: Hongchang Li
> Assignee: Koji Noguchi
>
> this ticket was very close to
> http://stackoverflow.com/questions/8828839/how-can-correct-data-types-on-apache-pig-be-enforced.
> To reproduce the issue, first, we have an UDF to cast map to bag, code almost
> like(http://stackoverflow.com/questions/12476929/group-key-value-of-map-in-pig?answertab=votes#tab-top)
> {code:title=test.pig}
> $ cat test.pig
> register polisan/maptobag.jar;
> define MAPTOBAG maptobag.MAPTOBAG();
> A = load 'polisan/input1.txt' using PigStorage(' ') as (id:chararray, kv:[]);
> B = foreach A generate id, MAPTOBAG(kv) as to_bag;
> C = foreach B generate id, flatten(to_bag) as (key:chararray,
> value:chararray);
> D = group C by (id, key);
> E = foreach D generate group, MIN(C.value);
> dump E;
> {code}
> {code:title=polisan/input1.pig}
> 1 [x#1,y#ab]
> 1 [x#2,y#cd]
> {code}
> then run the pig, I got exception as following:
> {noformat}
> 2014-05-15 19:44:52,944 [Thread-2] WARN
> org.apache.hadoop.mapred.LocalJobRunner - job_local_0001
> org.apache.pig.backend.executionengine.ExecException: ERROR 0: Exception
> while executing (Name: D: Local Rearrange[tuple]{tuple}(false) - scope-42
> Operator Key: scope-42):
> org.apache.pig.backend.executionengine.ExecException: ERROR 2106: Error while
> computing min in Initial
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:289)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNextTuple(POLocalRearrange.java:263)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:282)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:277)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:1)
> 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$Job.run(LocalJobRunner.java:212)
> Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 2106:
> Error while computing min in Initial
> at org.apache.pig.builtin.StringMin$Initial.exec(StringMin.java:81)
> at org.apache.pig.builtin.StringMin$Initial.exec(StringMin.java:1)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:352)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNextTuple(POUserFunc.java:391)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:334)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:378)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNextTuple(POForEach.java:298)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:281)
> ... 8 more
> Caused by: java.lang.ClassCastException: org.apache.pig.data.DataByteArray
> cannot be cast to java.lang.String
> at org.apache.pig.builtin.StringMin$Initial.exec(StringMin.java:73)
> ... 15 more
> {noformat}
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