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https://issues.apache.org/jira/browse/LUCENE-8229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16418708#comment-16418708
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Jim Ferenczi commented on LUCENE-8229:
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I like the proposal here. For simple queries it makes the extraction of matched
positions trivial. Though I wonder how the complex queries would handle this,
for instance the AutomatonQuery cannot just return an enum over all matching
terms, we have a special handling of this query in highlighters to avoid the
explosion for instance. What is your current plan to handle this query ? Should
it return null for simplicity or should it try to expand the automaton with a
limit on the number of terms ? I prefer the former which is safe and if users
want to check the matching of a complex automaton they can use use a
MemoryIndex for each TopDocument and change the query to use the rewrite method
that builds a boolean query.
> 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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