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https://issues.apache.org/jira/browse/PIG-2827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418164#comment-13418164
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Haitao Yao commented on PIG-2827:
---------------------------------

the modified stacktrace should be like this:
java.lang.RuntimeException: General Exception executing function: 
        at org.apache.pig.builtin.TOP.exec(TOP.java:133)
        at org.apache.pig.builtin.TOP.exec(TOP.java:1)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:216)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:258)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:316)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:290)
        at 
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLimit.getNext(POLimit.java:85)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:460)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:428)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:408)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:1)
        at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
        at 
org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:650)
        at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:418)
        at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1131)
        at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.NullPointerException
        at org.apache.pig.data.DataType.compare(DataType.java:427)
        at org.apache.pig.builtin.TOP$TupleComparator.compare(TOP.java:97)
        at org.apache.pig.builtin.TOP$TupleComparator.compare(TOP.java:1)
        at java.util.PriorityQueue.siftUpUsingComparator(PriorityQueue.java:649)
        at java.util.PriorityQueue.siftUp(PriorityQueue.java:627)
        at java.util.PriorityQueue.offer(PriorityQueue.java:329)
        at java.util.PriorityQueue.add(PriorityQueue.java:306)
        at org.apache.pig.builtin.TOP.updateTop(TOP.java:141)
        at org.apache.pig.builtin.TOP.exec(TOP.java:116)
        ... 20 more
                
> TOP exception bug
> -----------------
>
>                 Key: PIG-2827
>                 URL: https://issues.apache.org/jira/browse/PIG-2827
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Haitao Yao
>         Attachments: TOP.patch
>
>
> the current exception will swallow the inner exception's stacktrace like this:
> java.lang.RuntimeException: General Exception executing function: 
> java.lang.NullPointerException
>       at org.apache.pig.builtin.TOP.exec(TOP.java:133)
>       at org.apache.pig.builtin.TOP.exec(TOP.java:1)
>       at 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:216)
>       at 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:258)
>       at 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:316)
>       at 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332)
>       at 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284)
>       at 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:290)
>       at 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:233)
>       at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:460)
>       at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:428)
>       at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:408)
>       at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:1)
>       at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
>       at 
> org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:650)
>       at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:418)
>       at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:415)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1131)
>       at org.apache.hadoop.mapred.Child.main(Child.java:249)
> we can not locate the real errors.

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