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Date: Wed, 7 Dec 2011 08:14:42 +0000 (UTC)
From: "Navis (Updated) (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Updated] (HIVE-2329) Not using map aggregation, fails to
 execute group-by after cluster-by with same key
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     [ https://issues.apache.org/jira/browse/HIVE-2329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Navis updated HIVE-2329:
------------------------

    Attachment: HIVE-2329.1.patch.txt

rebased to trunk
                
> Not using map aggregation, fails to execute group-by after cluster-by with same key
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-2329
>                 URL: https://issues.apache.org/jira/browse/HIVE-2329
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.8.0
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>         Attachments: HIVE-2329.1.patch.txt
>
>
> hive.map.aggr=false
> select Q1.key_int1, sum(Q1.key_int1), sum(distinct Q1.key_int1) from (select * from t1 cluster by key_int1) Q1 group by Q1.key_int1
> resulted..
> FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.MapRedTask
> from hadoop logs..
> Caused by: java.lang.RuntimeException: cannot find field key from []
> 	at org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.getStandardStructFieldRef(ObjectInspectorUtils.java:321)
> 	at org.apache.hadoop.hive.serde2.objectinspector.StandardStructObjectInspector.getStructFieldRef(StandardStructObjectInspector.java:119)
> 	at org.apache.hadoop.hive.ql.exec.ExprNodeColumnEvaluator.initialize(ExprNodeColumnEvaluator.java:82)
> 	at org.apache.hadoop.hive.ql.exec.GroupByOperator.initializeOp(GroupByOperator.java:198)
> 	at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:357)
> 	at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:433)
> ........
> I think the problem is caused by ReduceSinkDeDuplication, removing RS which was providing rs.key for GBY operation. If child of child RS is a GBY, we should bypass the optimization.

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