[LUCENE-7993] Speed up phrase queries when total hit count is not needed

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 8.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Adrien Grand
• Created: 13/Oct/17 07:58
• Updated: 17/Sep/24 09:45
• Resolved: 29/Dec/17 09:09

Description

Follow-up of LUCENE-4100: When thinking about the API that we needed to introduce to support MAXSCORE, I wondered whether the same API could support other optimizations. The idea is that when running phrase queries, before we start reading positions, we already have access to the term frequency of each term. And the frequency of the phrase is bounded by the minimum term frequency of the involved terms. So if the score for that minimum term frequency is not competitive then it means that the score for the phrase is not competitive either if we can assume that the score increases (or stagnates) when the term freq increases, which sounds like an ok requirement for a sane Similarity?

Issue Links

• is blocked by: LUCENE-7997 More sanity testing of similarities