[LUCENE-2590] Enable access to the freq information in a Query's sub-scorers

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.1, 4.0-ALPHA
• Component/s: core/search
• Lucene Fields: New
• Assignee: Simon Willnauer
• Reporter: Michael McCandless
• Created: 08/Aug/10 14:08
• Updated: 28/Aug/22 12:30
• Resolved: 01/Sep/10 13:54

Description

The ability to gather more details than just the score, of how a given
doc matches the current query, has come up a number of times on the
user's lists. (most recently in the thread "Query Match Count" by
Ryan McV on java-user).

EG if you have a simple TermQuery "foo", on each hit you'd like to
know how many times "foo" occurred in that doc; or a BooleanQuery +foo
+bar, being able to separately see the freq of foo and bar for the
current hit.

Lucene doesn't make this possible today, which is a shame because
Lucene in fact does compute exactly this information; it's just not
accessible from the Collector.

Issue Links

• is broken by: LUCENE-2686 DisjunctionSumScorer should not call .score on sub scorers until consumer calls .score