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Posted to dev@lucene.apache.org by "Alan Woodward (JIRA)" <ji...@apache.org> on 2018/03/28 14:48:00 UTC
[jira] [Commented] (LUCENE-8229) Add a method to Weight to retrieve
matches for a single document
[ https://issues.apache.org/jira/browse/LUCENE-8229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16417443#comment-16417443 ]
Alan Woodward commented on LUCENE-8229:
---------------------------------------
The PR linked above illustrates the idea. There are still some TODOs (I haven't added anything to PhraseWeight yet, for example). Comments welcome!
> 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
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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