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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2329) Not using map aggregation, fails to execute group-by after cluster-by with same key
Date Fri, 09 Dec 2011 19:24:40 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13166472#comment-13166472
] 

Hudson commented on HIVE-2329:
------------------------------

Integrated in Hive-trunk-h0.23.0 #12 (See [https://builds.apache.org/job/Hive-trunk-h0.23.0/12/])
    HIVE-2329 Not using map aggregation, fails to execute group-by after
cluster-by with same key (Navis via namit)

namit : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1212551
Files : 
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/ReduceSinkDeDuplication.java
* /hive/trunk/ql/src/test/queries/clientpositive/reduce_deduplicate_exclude_gby.q
* /hive/trunk/ql/src/test/results/clientpositive/reduce_deduplicate_exclude_gby.q.out

                
> 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
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>             Fix For: 0.9.0
>
>         Attachments: HIVE-2329.1.patch.txt, HIVE-2329.D657.1.patch
>
>
> 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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