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https://issues.apache.org/jira/browse/LUCENE-8828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855872#comment-16855872
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Alan Woodward commented on LUCENE-8828:
---------------------------------------
In particular, the query described in LUCENE-2861 does not work with the
current implementation, but does with the two-subsource rewrite implementation
detailed above.
> Fix Intervals.unordered() without overlaps
> ------------------------------------------
>
> Key: LUCENE-8828
> URL: https://issues.apache.org/jira/browse/LUCENE-8828
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
>
> LUCENE-8300 added an option to Intervals.unordered() which would attempt to
> find intervals that contained all of a set of subintervals where none of the
> subintervals overlapped. Unfortunately, this implementation was buggy, and
> could miss documents depending on the order in which the subintervals were
> passed to the factory method.
> After some digging around, I think that it is not in fact possible to
> implement this in anything other than n! time, because of the need to
> minimize the resulting intervals. My proposal is to remove the boolean flag,
> and instead implement an Intervals.unorderedNoOverlaps() method that takes
> only two subsources, and rewrites NO_OVERLAPS(a, b) to OR(ORDERED(a, b),
> ORDERED(b, a)). The usual simplifications will apply here, so NO_OVERLAPS(a,
> a) will end up as ORDERED(a, a)
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