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From rohan monga <monga.ro...@gmail.com>
Subject Invoke a UDAF inside another UDAF
Date Fri, 20 Jan 2012 20:27:46 GMT
Hi,
I am trying to run a query like
"select mean(count(a)) from table1 group by b;"

I am getting the following error
<snip>
FAILED: Hive Internal Error: java.lang.NullPointerException(null)
java.lang.NullPointerException
    at
org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc.newInstance(ExprNodeGenericFuncDesc.java:151)
    at
org.apache.hadoop.hive.ql.parse.TypeCheckProcFactory$DefaultExprProcessor.getXpathOrFuncExprNodeDesc(TypeCheckProcFactory.java:656)
    at
org.apache.hadoop.hive.ql.parse.TypeCheckProcFactory$DefaultExprProcessor.process(TypeCheckProcFactory.java:777)
    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:125)
    at
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.startWalking(DefaultGraphWalker.java:102)
    at
org.apache.hadoop.hive.ql.parse.TypeCheckProcFactory.genExprNode(TypeCheckProcFactory.java:157)
    at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genExprNodeDesc(SemanticAnalyzer.java:7447)
    at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genExprNodeDesc(SemanticAnalyzer.java:7405)
    at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genGroupByPlanMapGroupByOperator(SemanticAnalyzer.java:2747)
    at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genGroupByPlanMapAggr1MR(SemanticAnalyzer.java:3365)
    at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genBodyPlan(SemanticAnalyzer.java:5858)
    at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:6480)
    at
org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:7223)
    at
org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:240)
    at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:428)
    at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:336)
    at org.apache.hadoop.hive.ql.Driver.run(Driver.java:901)
    at
org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:253)
    at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:210)
    at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:401)
    at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:336)
    at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:635)
    at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:552)
    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:197)
</snip>

Is there a workaround ? I have tried with hive 0.7.1 and 0.8

Thanks
--
Rohan Monga

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