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https://issues.apache.org/jira/browse/HIVE-22508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Krisztian Kasa updated HIVE-22508:
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    Status: Open  (was: Patch Available)

> KeyWrapperComparator throws exception
> -------------------------------------
>
>                 Key: HIVE-22508
>                 URL: https://issues.apache.org/jira/browse/HIVE-22508
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>            Reporter: Krisztian Kasa
>            Assignee: Krisztian Kasa
>            Priority: Major
>             Fix For: 4.0.0
>
>         Attachments: HIVE-22508.1.patch, HIVE-22508.1.patch
>
>
> TopNKeyOperator.KeyWrapperComparator throws exception when a new key and a 
> copied key should be compared.
> The current implementation uses the standard object inspectors for all 
> KeyWrapper instances. However when comparing untouched KeyWrappers the key 
> object inspector should be used which can be extracted form 
> Operator.inputObjectInspectors during initialization of the key's 
> ExprNodeEvaluator. 
> This can cause a ClassCastException when the comparator is used collections 
> like TreeSet.



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