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Posted to dev@hive.apache.org by "John Sichi (JIRA)" <ji...@apache.org> on 2011/08/02 20:16:27 UTC
[jira] [Commented] (HIVE-2329) Not using map aggregation, fails to
execute group-by after cluster-by with same key
[ https://issues.apache.org/jira/browse/HIVE-2329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13078333#comment-13078333 ]
John Sichi commented on HIVE-2329:
----------------------------------
Good catch. Can you submit an updated patch which includes a testcase (.q and .q.out) files, and then create a Review Board entry?
https://cwiki.apache.org/confluence/display/Hive/HowToContribute#HowToContribute-ReviewProcess
> 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
> Affects Versions: 0.8.0
> Reporter: Navis
> Assignee: Navis
> Priority: Minor
> Attachments: HIVE-2329.1.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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