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https://issues.apache.org/jira/browse/HIVE-1399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13550517#comment-13550517
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Ashutosh Chauhan commented on HIVE-1399:
----------------------------------------
Sure, please go ahead.
> Nested UDAFs cause Hive Internal Error (NullPointerException)
> -------------------------------------------------------------
>
> Key: HIVE-1399
> URL: https://issues.apache.org/jira/browse/HIVE-1399
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.9.0
> Reporter: Mayank Lahiri
> Assignee: Adam Fokken
> Attachments: HIVE-1399.1.patch.txt
>
>
> 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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