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https://issues.apache.org/jira/browse/HIVE-22507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Krisztian Kasa updated HIVE-22507:
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Status: Open (was: Patch Available)
> KeyWrapper comparator create field comparator instances at every comparison
> ----------------------------------------------------------------------------
>
> Key: HIVE-22507
> URL: https://issues.apache.org/jira/browse/HIVE-22507
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-22507.1.patch, HIVE-22507.2.patch,
> HIVE-22507.2.patch
>
>
> TopNKeyOperator.KeyWrapperComparator uses separate comparators for each field
> of the keys. Every time when TopNKeyOperator.KeyWrapperComparator.compare is
> called a new instance of the field operators are created.
> The field comparators should be created prior any comparison. Probably in the
> constructor of KeyWrapperComparator or during initializeOp.
> https://github.com/apache/hive/blob/fc81b8909b1a0e6aa15900387a98bccf38ae2247/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ObjectInspectorUtils.java#L964
>
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