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Posted to issues@lucene.apache.org by "Alan Woodward (Jira)" <ji...@apache.org> on 2020/07/25 10:03:00 UTC
[jira] [Updated] (LUCENE-9439) Matches API should enumerate hit
fields that have no positions (no iterator)
[ https://issues.apache.org/jira/browse/LUCENE-9439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan Woodward updated LUCENE-9439:
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Attachment: LUCENE-9439.patch
> 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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