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https://issues.apache.org/jira/browse/PIG-812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Reed updated PIG-812:
------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
Committed revision 806668.
> COUNT(*) does not work
> -----------------------
>
> Key: PIG-812
> URL: https://issues.apache.org/jira/browse/PIG-812
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.2.0
> Reporter: Viraj Bhat
> Assignee: Benjamin Reed
> Fix For: 0.2.0
>
> Attachments: PIG-812.patch, PIG-812.patch, PIG-812.pdf, studenttab10k
>
>
> Pig script to count the number of rows in a studenttab10k file which contains
> 10k records.
> {code}
> studenttab = LOAD 'studenttab10k' AS (name:chararray, age:int,gpa:float);
> X2 = GROUP studenttab ALL;
> describe X2;
> Y2 = FOREACH X2 GENERATE COUNT(*);
> explain Y2;
> DUMP Y2;
> {code}
> returns the following error
> ================================================================
> ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1066: Unable to open iterator
> for alias Y2
> Details at logfile: /homes/viraj/pig-svn/trunk/pig_1242783700970.log
> ================================================================
> If you look at the log file:
> ================================================================
> Caused by: java.lang.ClassCastException
> at org.apache.pig.builtin.COUNT$Initial.exec(COUNT.java:76)
> at org.apache.pig.builtin.COUNT$Initial.exec(COUNT.java:68)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:201)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:235)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:254)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:204)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:231)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNext(POLocalRearrange.java:223)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:245)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:236)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.map(PigMapReduce.java:88)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
> ================================================================
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