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Posted to dev@lucene.apache.org by "Alan Woodward (JIRA)" <ji...@apache.org> on 2018/07/06 08:22:00 UTC
[jira] [Commented] (LUCENE-8306) Allow iteration over the term
positions of a Match
[ https://issues.apache.org/jira/browse/LUCENE-8306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534564#comment-16534564 ]
Alan Woodward commented on LUCENE-8306:
---------------------------------------
I've been playing around with various options for this API, and I think the one that fits best with highlighters is to add another method to Matches that returns a PostingsEnum across all term matches for a particular field. Highlighters can call {{Matches.getMatches(field)}} to get an iterator over intervals, which will allow them to decide how to build passages, and then {{Matches.getTermMatches(field)}} to get the individual term matches - this would also allow for exposing term frequencies for scoring, payloads, etc.
I'm not sure yet whether or not to return a TermPostingsEnum or just a plain PostingsEnum - the latter keeps the API surface low, but the former could be useful for passage scoring.
> Allow iteration over the term positions of a Match
> --------------------------------------------------
>
> Key: LUCENE-8306
> URL: https://issues.apache.org/jira/browse/LUCENE-8306
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Attachments: LUCENE-8306.patch, LUCENE-8306.patch
>
>
> For multi-term queries such as phrase queries, the matches API currently just returns information about the span of the whole match. It would be useful to also expose information about the matching terms within the phrase. The same would apply to Spans and Interval queries.
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