[jira] [Resolved] (LUCENE-9099) Correctly handle repeats in ordered and unordered intervals

["Alan Woodward (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-9099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Woodward resolved LUCENE-9099.
-----------------------------------
    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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