Krisztian Kasa created HIVE-22507:
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Summary: KeyWrapper comparator create subcomparator instances
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
Fix For: 4.0.0
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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