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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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Attachment: HIVE-22508.2.patch
> 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,
> HIVE-22508.1.patch, HIVE-22508.2.patch, HIVE-22508.2.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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