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https://issues.apache.org/jira/browse/LUCENE-8229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16422822#comment-16422822
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Alan Woodward commented on LUCENE-8229:
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I've pushed a few more changes - IndexOrDocValuesQuery should use the dvWeight
to check if it matches, I've added a term() method so that the iterator can
report which term it's currently positioned on, and I've removed the iteration
for SpanQueries. I want to think more about how we iterate over composite
queries like Span or phrase (or interval, soon), as I can see situations where
we'd both want to iterate over the whole thing, or where we'd want iterate over
the sub parts as well, and I'd like to leave that to a follow-up issue.
> 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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