[LUCENE-8204] ReqOptSumScorer should leverage sub scorers' per-block max scores

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 8.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Adrien Grand
• Created: 14/Mar/18 12:59
• Updated: 14/Mar/19 13:07
• Resolved: 08/Aug/18 13:50

Description

Currently it only looks at max scores on the entire segment. Given that per-block max scores usually give lower upper bounds of the score, this should help.

This is especially important for LUCENE-8197 to work well since the main query would typically be added as a MUST clauses of a boolean query while the query that scores on features would be a SHOULD clause.