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https://issues.apache.org/jira/browse/LUCENE-8306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16482024#comment-16482024
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David Smiley commented on LUCENE-8306:
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I like TermPostingsEnum. I wish PostingsEnum simply already had the Term –
I've on multiple occasions had to add extra code (be it just a field or extra
abstractions (classes)) to pair a term with it's PostingsEnum. Surely I'm not
the only one? I wonder what divorcing them (what we have today) gains us? I
think the TermPostingsEnum implementation could be less code by simply
extending FilterPostingsEnum. Oh I see; that's not possible because
PostingsEnum is not an interface. If TPE is declared to extend
FilterPostingsEnum then it'd work though may feel a little iffy. Perhaps once
upon a time it was reasonable for most of these foundational classes in Lucene
to be abstract classes but with Java 8 default methods on interfaces, I
question that now.
The TermMatchCollector interface looks fine to me. It gives the implementation
more freedom to implement it efficiently and easier implementation, though it
does force the caller to fully collect instead of iterating at it's leisure,
potentially stopping short. I'm fine with that.
Another way to handle the requirement of exposing each match is for
MatchesIterator itself to be able to iterate two things – both the spans
iteration (what it does now), and the position iteration. If it worked this
way then I imagine it might as well extend PostingsEnum (or the
TermPostingsEnum here). That might be quite useful since some MatchesIterator
will effectively simply be a wrapped PostingsEnum. Another similar alternative
is to return the TermPostingsEnum enumeration from a MatchesIterator to better
differentiate what is being iterated (span vs position). The best benefit to
the approach here (vs your two approaches thus far) is that we don't need any
new abstraction... albeit TermPostingsEnum which sorta counts but as I said
perhaps we can migrate to PostingsEnum exposing the Term?
> 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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