[jira] [Created] (LUCENE-8229) Add a method to Weight to retrieve matches for a single document

["Alan Woodward (JIRA)" <ji...@apache.org>]

Alan Woodward created LUCENE-8229:
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             Summary: Add a method to Weight to retrieve matches for a single document
                 Key: LUCENE-8229
                 URL: https://issues.apache.org/jira/browse/LUCENE-8229
             Project: Lucene - Core
          Issue Type: New Feature
            Reporter: Alan Woodward
            Assignee: Alan Woodward


The ability to find out exactly what a query has matched on is a fairly frequent feature request, and would also make highlighters much easier to implement.  There have been a few attempts at doing this, including adding positions to Scorers, or re-writing queries as Spans, but these all either compromise general performance or involve up-front knowledge of all queries.

Instead, I propose adding a method to Weight that exposes an iterator over matches in a particular document and field.  It should be used in a similar manner to explain() - ie, just for TopDocs, not as part of the scoring loop, which relieves some of the pressure on performance.



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