Pig do not support group by boolean type
----------------------------------------

                 Key: PIG-1097
                 URL: https://issues.apache.org/jira/browse/PIG-1097
             Project: Pig
          Issue Type: Improvement
          Components: impl
            Reporter: Jeff Zhang
            Assignee: Jeff Zhang
            Priority: Minor
             Fix For: 0.6.0


My Script is as following, the TestUDF return boolean type.

{color:blue}
DEFINE testUDF org.apache.pig.piggybank.util.TestUDF();

raw = LOAD 'data/input';
raw = FOREACH raw GENERATE testUDF();
raw = GROUP raw BY $0;
DUMP raw;
{color}

*The above script will throw exception:*

Exception in thread "main" org.apache.pig.impl.logicalLayer.FrontendException: 
ERROR 1066: Unable to open iterator for alias raw
        at org.apache.pig.PigServer.openIterator(PigServer.java:481)
        at 
org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:539)
        at 
org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:241)
        at 
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:168)
        at org.apache.pig.PigServer.registerScript(PigServer.java:409)
        at PigExample.main(PigExample.java:13)
Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1002: 
Unable to store alias raw
        at org.apache.pig.PigServer.store(PigServer.java:536)
        at org.apache.pig.PigServer.openIterator(PigServer.java:464)
        ... 5 more
Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 2043: 
Unexpected error during execution.
        at 
org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.execute(HExecutionEngine.java:269)
        at 
org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:780)
        at org.apache.pig.PigServer.store(PigServer.java:528)
        ... 6 more
Caused by: 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobCreationException:
 ERROR 2036: Unhandled key type boolean
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.selectComparator(JobControlCompiler.java:856)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.getJob(JobControlCompiler.java:561)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.compile(JobControlCompiler.java:251)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:128)
        at 
org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.execute(HExecutionEngine.java:249)
        ... 8 more


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