Nested UDAFs cause Hive Internal Error (NullPointerException)
-------------------------------------------------------------

                 Key: HIVE-1399
                 URL: https://issues.apache.org/jira/browse/HIVE-1399
             Project: Hadoop Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.6.0
            Reporter: Mayank Lahiri
             Fix For: 0.6.0


This query does not make "real-world" sense, and I'm guessing it's not even 
supported by HQL/SQL, but I'm pretty sure that it shouldn't be causing an 
internal error with a NullPointerException. "normal" just has one column called 
"val". I'm running on trunk, svn updated 5 minutes ago, ant clean package.

SELECT percentile(val, percentile(val, 0.5)) FROM normal;

FAILED: Hive Internal Error: java.lang.NullPointerException(null)
java.lang.NullPointerException
        at 
org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc.newInstance(ExprNodeGenericFuncDesc.java:153)
        at 
org.apache.hadoop.hive.ql.parse.TypeCheckProcFactory$DefaultExprProcessor.getXpathOrFuncExprNodeDesc(TypeCheckProcFactory.java:587)
        at 
org.apache.hadoop.hive.ql.parse.TypeCheckProcFactory$DefaultExprProcessor.process(TypeCheckProcFactory.java:708)
        at 
org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:89)
        at 
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:88)
        at 
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.walk(DefaultGraphWalker.java:128)
        at 
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.startWalking(DefaultGraphWalker.java:102)
        at 
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genExprNodeDesc(SemanticAnalyzer.java:6241)
        at 
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genGroupByPlanMapGroupByOperator(SemanticAnalyzer.java:2301)
        at 
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genGroupByPlanMapAggr1MR(SemanticAnalyzer.java:2860)
        at 
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genBodyPlan(SemanticAnalyzer.java:5002)
        at 
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:5524)
        at 
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:6055)
        at 
org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:126)
        at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:304)
        at org.apache.hadoop.hive.ql.Driver.run(Driver.java:377)
        at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:138)
        at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:197)
        at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:303)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:156)



I've also recreated this error with a GenericUDAF I'm writing, and also with 
the following:

SELECT percentile(val, percentile()) FROM normal;   
SELECT avg(variance(dob_year)) FROM somedata;     // this makes no sense, but 
still a NullPointerException

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