[
https://issues.apache.org/jira/browse/PIG-146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Olga Natkovich resolved PIG-146.
--------------------------------
Resolution: Fixed
This is addressed with the latest code.
> More meaningful error message could be used when a non-existing column is
> accessed
> ----------------------------------------------------------------------------------
>
> Key: PIG-146
> URL: https://issues.apache.org/jira/browse/PIG-146
> Project: Pig
> Issue Type: Bug
> Reporter: Xu Zhang
> Priority: Minor
>
> When accessing a non-existing column after getting the columns with a
> streaming command, I got the following error which is not quite meaningfule:
> {noformat}
> [main] ERROR org.apache.pig.tools.grunt.Grunt -
> {noformat}
> Here is the sample Pig script that I used. The data file has only 3 tab
> seperate fields so the streaming command on line 3 generates tuples with 3
> columns. On line 4 the script tries to access the 4th column which does not
> exist and thus the error above occurs.
> {code}
> A = load 'data;
> B = foreach A generate $2, $1, $0;
> C = stream B through `awk 'BEGIN {FS = "\t"; OFS = "\t"} {print $3, $2, $1}'`;
> D = foreach C generate $4;
> store D into 'results';
> {code}
> Here is what happens on my machine:
> {code}
> grunt> A = load 'data';
> grunt> B = foreach A generate $2, $1, $0;
> grunt> stream B through `awk 'BEGIN {FS = "\t"; OFS = "\t"} {print $3, $2,
> $1}'`;
> grunt> D = foreach C generate $4;
> 2008-03-11 18:53:00,376 [main] ERROR org.apache.pig.tools.grunt.GruntParser -
> grunt>
> {code}
> A related note is that Pig behaves differently if there is no streaming
> command in the Pig script. In this case, an IndexOutOfBoundsException
> exception is generated at runtime.
> {code}
> grunt> A = load 'data';
> grunt> B = foreach A generate $2, $1, $0;
> grunt> D = foreach B generate $4;
> grunt> store D into 'results';
> 2008-03-11 18:57:40,107 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - ----- MapReduce
> Job -----
> 2008-03-11 18:57:40,108 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Input:
> [data:org.apache.pig.builtin.PigStorage()]
> 2008-03-11 18:57:40,109 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Map:
> [[*]->GENERATE {[PROJECT $2],[PROJECT $1],[PROJECT $0]}->GENERATE {[PROJECT
> $4]}]
> 2008-03-11 18:57:40,109 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Group: null
> 2008-03-11 18:57:40,110 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Combine: null
> 2008-03-11 18:57:40,110 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Reduce: null
> 2008-03-11 18:57:40,111 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Output:
> results:org.apache.pig.builtin.PigStorage
> 2008-03-11 18:57:40,111 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Split: null
> 2008-03-11 18:57:40,112 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Map parallelism:
> -1
> 2008-03-11 18:57:40,112 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.POMapreduce - Reduce
> parallelism: -1
> 2008-03-11 18:57:42,391 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
> - Pig progress = 0%
> 2008-03-11 18:57:59,466 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
> - Error message from task (map) tip_200802211201_1494_m_000000
> java.lang.IndexOutOfBoundsException: Requested index 4 from tuple (2.93, 21,
> rachel ovid)
> at org.apache.pig.data.Tuple.getField(Tuple.java:153)
> at org.apache.pig.impl.eval.ProjectSpec.eval(ProjectSpec.java:84)
> at
> org.apache.pig.impl.eval.SimpleEvalSpec$1.add(SimpleEvalSpec.java:35)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.exec(GenerateSpec.java:261)
> at org.apache.pig.impl.eval.GenerateSpec$1.add(GenerateSpec.java:86)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.add(GenerateSpec.java:230)
> at
> org.apache.pig.impl.eval.collector.UnflattenCollector.add(UnflattenCollector.java:52)
> at
> org.apache.pig.impl.eval.collector.DataCollector.addToSuccessor(DataCollector.java:93)
> at
> org.apache.pig.impl.eval.SimpleEvalSpec$1.add(SimpleEvalSpec.java:35)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.exec(GenerateSpec.java:261)
> at org.apache.pig.impl.eval.GenerateSpec$1.add(GenerateSpec.java:86)
> at
> org.apache.pig.backend.hadoop.executionengine.mapreduceExec.PigMapReduce.run(PigMapReduce.java:113)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:192)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1760)
> java.lang.IndexOutOfBoundsException: Requested index 4 from tuple (2.93, 21,
> rachel ovid)
> at org.apache.pig.data.Tuple.getField(Tuple.java:153)
> at org.apache.pig.impl.eval.ProjectSpec.eval(ProjectSpec.java:84)
> at
> org.apache.pig.impl.eval.SimpleEvalSpec$1.add(SimpleEvalSpec.java:35)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.exec(GenerateSpec.java:261)
> at org.apache.pig.impl.eval.GenerateSpec$1.add(GenerateSpec.java:86)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.add(GenerateSpec.java:230)
> at
> org.apache.pig.impl.eval.collector.UnflattenCollector.add(UnflattenCollector.java:52)
> at
> org.apache.pig.impl.eval.collector.DataCollector.addToSuccessor(DataCollector.java:93)
> at
> org.apache.pig.impl.eval.SimpleEvalSpec$1.add(SimpleEvalSpec.java:35)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.exec(GenerateSpec.java:261)
> at org.apache.pig.impl.eval.GenerateSpec$1.add(GenerateSpec.java:86)
> at
> org.apache.pig.backend.hadoop.executionengine.mapreduceExec.PigMapReduce.run(PigMapReduce.java:113)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:192)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1760)
> java.lang.IndexOutOfBoundsException: Requested index 4 from tuple (2.93, 21,
> rachel ovid)
> at org.apache.pig.data.Tuple.getField(Tuple.java:153)
> at org.apache.pig.impl.eval.ProjectSpec.eval(ProjectSpec.java:84)
> at
> org.apache.pig.impl.eval.SimpleEvalSpec$1.add(SimpleEvalSpec.java:35)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.exec(GenerateSpec.java:261)
> at org.apache.pig.impl.eval.GenerateSpec$1.add(GenerateSpec.java:86)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.add(GenerateSpec.java:230)
> at
> org.apache.pig.impl.eval.collector.UnflattenCollector.add(UnflattenCollector.java:52)
> at
> org.apache.pig.impl.eval.collector.DataCollector.addToSuccessor(DataCollector.java:93)
> at
> org.apache.pig.impl.eval.SimpleEvalSpec$1.add(SimpleEvalSpec.java:35)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.exec(GenerateSpec.java:261)
> at org.apache.pig.impl.eval.GenerateSpec$1.add(GenerateSpec.java:86)
> at
> org.apache.pig.backend.hadoop.executionengine.mapreduceExec.PigMapReduce.run(PigMapReduce.java:113)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:192)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1760)
> java.lang.IndexOutOfBoundsException: Requested index 4 from tuple (2.93, 21,
> rachel ovid)
> at org.apache.pig.data.Tuple.getField(Tuple.java:153)
> at org.apache.pig.impl.eval.ProjectSpec.eval(ProjectSpec.java:84)
> at
> org.apache.pig.impl.eval.SimpleEvalSpec$1.add(SimpleEvalSpec.java:35)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.exec(GenerateSpec.java:261)
> at org.apache.pig.impl.eval.GenerateSpec$1.add(GenerateSpec.java:86)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.add(GenerateSpec.java:230)
> at
> org.apache.pig.impl.eval.collector.UnflattenCollector.add(UnflattenCollector.java:52)
> at
> org.apache.pig.impl.eval.collector.DataCollector.addToSuccessor(DataCollector.java:93)
> at
> org.apache.pig.impl.eval.SimpleEvalSpec$1.add(SimpleEvalSpec.java:35)
> at
> org.apache.pig.impl.eval.GenerateSpec$CrossProductItem.exec(GenerateSpec.java:261)
> at org.apache.pig.impl.eval.GenerateSpec$1.add(GenerateSpec.java:86)
> at
> org.apache.pig.backend.hadoop.executionengine.mapreduceExec.PigMapReduce.run(PigMapReduce.java:113)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:192)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1760)
> 2008-03-11 18:57:59,469 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
> - Error message from task (reduce) tip_200802211201_1494_r_000000
> 2008-03-11 18:57:59,470 [main] ERROR org.apache.pig.tools.grunt.GruntParser -
> Unable to store alias D
> {code}
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