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https://issues.apache.org/jira/browse/LUCENE-9439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165112#comment-17165112
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Dawid Weiss commented on LUCENE-9439:
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Let me return to it on Monday, Alan. I am away for the weekend. I still think
conceptually match position iterator returning -1 doesn't make much sense, at
least from the use case of highlighting. This is different from offsets which
may not be available (but you still have positions then).
> Matches API should enumerate hit fields that have no positions (no iterator)
> ----------------------------------------------------------------------------
>
> Key: LUCENE-9439
> URL: https://issues.apache.org/jira/browse/LUCENE-9439
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Minor
> Attachments: LUCENE-9439.patch
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> I have been fiddling with Matches API and it's great. There is one corner
> case that doesn't work for me though -- queries that affect fields without
> positions return {{MatchesUtil.MATCH_WITH_NO_TERMS}} but this constant is
> problematic as it doesn't carry the field name that caused it (returns null).
> The associated fromSubMatches combines all these constants into one (or
> swallows them) which is another problem.
> I think it would be more consistent if MATCH_WITH_NO_TERMS was replaced with
> a true match (carrying field name) returning an empty iterator (or a constant
> "empty" iterator NO_TERMS).
> I have a very compelling use case: I wrote an "auto-highlighter" that runs on
> top of Matches API and automatically picks up query-relevant fields and
> snippets. Everything works beautifully except for cases where fields are
> searchable but don't have any positions (token-like fields).
> I can work on a patch but wanted to reach out first - [~romseygeek]?
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