[LUCENE-8016] Bound values of boosts

• Type: Task
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Fix Version/s: 8.1
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Adrien Grand
• Created: 26/Oct/17 09:34
• Updated: 28/Aug/22 15:20

Description

We allow any boosts to be passed down to similarities, eg. via BoostQuery. This is a bit trappy since it means that you can make scores rounded down to 0 and/or slow to compute (because of subnormal floats) by using tiny boosts, or infinite scores if you pass boosts that are too close to the float max value.

I would like to restrict boosts to be either +0 or between 2 ^-10 and 2 ¹⁰ .

Any objections?