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From "Mark Harwood (JIRA)" <>
Subject [jira] Created: (LUCENE-1999) Match spotter for all query types
Date Tue, 20 Oct 2009 23:10:01 GMT
Match spotter for all query types

                 Key: LUCENE-1999
             Project: Lucene - Java
          Issue Type: New Feature
    Affects Versions: 2.9
            Reporter: Mark Harwood
         Attachments: matchflagger.patch

Related to LUCENE-1929 and the current inability to highlight NumericRangeQuery, spatial,
cached term filters and other exotica.

This patch provides the ability to wrap *any* Query objects and record match info as flags
encoded in the overall document score.
Using this approach it would be possible to understand (and therefore highlight) which fields
matched clauses in a query.

The match encoding approach loses some precision in scores as noted here:

Avoiding these precision issues would require a change to Lucene core to record docId, score
AND a matchFlag byte in ScoreDoc objects and collector APIs.
This may be something we should consider.

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