[LUCENE-10498] Optimize TopField and TopScoreDoc collector by only counting hits when necessary

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 9.2
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Luca Cavanna
• Created: 04/Apr/22 12:18
• Updated: 28/Aug/22 16:38
• Resolved: 04/Apr/22 16:02

Description

The current implementations of TopFieldCollector and TopScoreDocCollector count the number of hits as part of their HitsThresholdChecker impl. When early termination is disabled, meaning when total hits is Integer.MAX_VALUE, counting as well as accumulating scores in MaxScoreAccumulator is not necessary.

We could optimize these two collector by disabling the counting as well as scores accumulation when early termination is not possible.

This is a spin-off of LUCENE-10486.

Issue Links

• links to: GitHub Pull Request #782