[jira] [Created] (LUCENE-10229) Match offsets should be consistent for fields with positions and fields with offsets

["Dawid Weiss (Jira)" <ji...@apache.org>]

Dawid Weiss created LUCENE-10229:
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             Summary: Match offsets should be consistent for fields with positions and fields with offsets
                 Key: LUCENE-10229
                 URL: https://issues.apache.org/jira/browse/LUCENE-10229
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Dawid Weiss


This is a follow-up of LUCENE-10223 in which it was discovered that fields with
offsets don't highlight some more complex interval queries properly.  Alan says:
{quote}
It's because it returns the position of the inner match, but the offsets of the outer.  And so if you're re-analyzing and retrieving offsets by looking at the positions, you get the 'right' thing.  It's not obvious to me what the correct response is here, but thinking about it the current behaviour is kind of the worst of both worlds, and perhaps we should change it so that you get offsets of the inner match as standard, and then the outer match is returned as part of the sub matches.
{quote}

Intervals are nicely separated into "basic intervals" and "filters" which restrict some other source of intervals, here is the original documentation:

https://github.com/apache/lucene/blob/main/lucene/queries/src/java/org/apache/lucene/queries/intervals/package-info.java#L29-L50

My experience from an extended period of using interval queries in a frontend where they're highlighted is that filters are restrictions that should not be highlighted - it's the source intervals that people care about. Filters are what you remove or where you give proper context to source intervals.

The test code contributed in LUCENE-10223 contains numerous query-highlight examples (on fields with positions) where this intuition is demonstrated on all kinds of interval functions:

https://github.com/apache/lucene/blob/main/lucene/highlighter/src/test/org/apache/lucene/search/matchhighlight/TestMatchHighlighter.java#L335-L542

This issue is about making the internals work consistently for fields with positions and fields with offsets.







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