Attila Magyar created HIVE-22726:
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Summary: TopN Key optimizer should use array instead of priority
queue
Key: HIVE-22726
URL: https://issues.apache.org/jira/browse/HIVE-22726
Project: Hive
Issue Type: Bug
Components: Hive
Reporter: Attila Magyar
Assignee: Attila Magyar
Fix For: 4.0.0
The TopN key optimizer currently uses a priority queue for keeping track of the
largest/smallest rows. Its max size is the same as the user specified limit.
This should be replaced a more cache line friendly array with a small (128)
maximum size and see how much performance is gained.
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