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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