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https://issues.apache.org/jira/browse/LUCENE-9439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17168916#comment-17168916
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Dawid Weiss commented on LUCENE-9439:
-------------------------------------
Aha! I was hoping for bright insights like this one! I'm working on five
threads at once here so expect some delays (or feel free to join in :) but I'll
try to push this forward. It already works so much better than any other
highlighting approach we've tried (we have it integrated in our systems, even
at this early stage).
> 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, matchhighlighter.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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