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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: (was: HIVE-2329.1.patch)
> 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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