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https://issues.apache.org/jira/browse/PIG-617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865455#action_12865455
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Gianmarco De Francisci Morales commented on PIG-617:
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This issue has been solved in trunk
grunt> a = load 'data' as (i:int);
grunt> b = foreach a generate SUM(i);
grunt> dump b;
2010-05-08 14:35:11,348 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
1045: Could not infer the matching function for org.apache.pig.builtin.SUM as
multiple or none of them fit. Please use an explicit cast.
> Using SUM with basic type fails
> -------------------------------
>
> Key: PIG-617
> URL: https://issues.apache.org/jira/browse/PIG-617
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.2.0
> Reporter: Santhosh Srinivasan
>
> SUM is an aggregate function that expects a bag as an argument. When basic
> types are used as arguments to SUM, Pig fails during run time. The
> typechecker should catch this error and fail earlier.
> An example is given below:
> {code}
> grunt> a = load 'one' as (i: int);
> grunt> b = foreach a generate SUM(i);
> grunt> dump b;
> 2009-01-12 14:11:47,595 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
> - 0% complete
> 2009-01-12 14:12:12,617 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
> - Map reduce job failed
> 2009-01-12 14:12:12,618 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
> - Job failed!
> 2009-01-12 14:12:12,623 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.Launcher - Error
> message from task (map)
> task_200812151518_9683_m_000000java.lang.ClassCastException:
> java.lang.Integer cannot be cast to org.apache.pig.data.DataBag
> 2009-01-12 14:12:12,623 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.Launcher - Error
> message from task (map)
> task_200812151518_9683_m_000000java.lang.ClassCastException:
> java.lang.Integer cannot be cast to org.apache.pig.data.DataBag
> at org.apache.pig.builtin.IntSum.sum(IntSum.java:141)
> at org.apache.pig.builtin.IntSum.exec(IntSum.java:41)
> at org.apache.pig.builtin.IntSum.exec(IntSum.java:36)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:185)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:247)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:265)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:197)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:187)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:175)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map.map(PigMapOnly.java:65)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
> ...
> 2009-01-12 14:12:12,629 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 1066: Unable to open iterator for alias b
> 2009-01-12 14:12:12,629 [main] ERROR org.apache.pig.tools.grunt.Grunt -
> org.apache.pig.impl.logicalLayer.FrontendException: Unable to open iterator
> for alias b
> at org.apache.pig.PigServer.openIterator(PigServer.java:425)
> at
> org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:271)
> at
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:178)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:84)
> at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:72)
> at org.apache.pig.Main.main(Main.java:302)
> Caused by: java.io.IOException: Job terminated with anomalous status FAILED
> at org.apache.pig.PigServer.openIterator(PigServer.java:419)
> ... 5 more
> {code}
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