Nikolay Khitrin created LUCENE-10140:
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Summary: Minimizing intervals can give inaccurate positions for
duplicate terms
Key: LUCENE-10140
URL: https://issues.apache.org/jira/browse/LUCENE-10140
Project: Lucene - Core
Issue Type: Bug
Components: modules/queries
Reporter: Nikolay Khitrin
Minimizing intervals (maybe just ORDERED and AT_LEAST, but not sure) can move
sub iterators to non-sub-match position *inside* match window, but
CachingMatchesIterator logic relies on heuristic that any position inside
matching interval is a sub-match.
For example: ORDERED("a", "b", "a") over "a b a" highlights (report
sub-matches) only "a <b>b</b> <b>a</b>", and ORDERED("a", "b", "a", "b", "a")
highlights only "a b <b>a</b> <b>b</b> <b>a</b>".
Looks like there is no way to determine the right moment to cache from caching
iterator perspective, so I propose to add an interface allowing minimizing
IntervalIterators notify sub-sources positioned at sub-match positions.
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