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https://issues.apache.org/jira/browse/LUCENE-9099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward resolved LUCENE-9099.
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Fix Version/s: 8.5
Resolution: Fixed
> Correctly handle repeats in ordered and unordered intervals
> -----------------------------------------------------------
>
> Key: LUCENE-9099
> URL: https://issues.apache.org/jira/browse/LUCENE-9099
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Fix For: 8.5
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> If you have repeating intervals in an ordered or unordered interval source,
> you currently get somewhat confusing behaviour:
> * ORDERED(a, a, b) will return an extra interval over just `a b` if it first
> matches `a a b`, meaning that you can get incorrect results if used in a
> CONTAINING filter - CONTAINING(ORDERED(x, y), ORDERED(a, a, b)) will match on
> the document `a x a b y`
> * UNORDERED(a, a) will match on documents that just containg a single `a`.
> It is possible to deal with the unordered case when building sources by
> rewriting duplicates to nested ORDERED clauses, so that UNORDERED(a, b, c, a,
> b) becomes UNORDERED(ORDERED(a, a), ORDERED(b, b), c), but this then breaks
> MAXGAPS filtering.
> We should try and fix this within intervals themselves.
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