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https://issues.apache.org/jira/browse/LUCENE-8196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16453767#comment-16453767
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Alan Woodward commented on LUCENE-8196:
---------------------------------------
I think minwidth() would run into problems with documents that have two
instances of 'b', because unordered will always find the minimal intervals, so
it would always end up with intervals of width 0, which would then be rejected
by the filter, and you'd end up with missing matches.
What we really need here I think is a new source, something like
'unordered-non-overlapping', which checks that all of the internal intervals
are separated. With a better name, of course :) . And we should rename
'unordered' to 'and' to make the semantics a bit clearer.
> Add IntervalQuery and IntervalsSource to expose minimum interval semantics
> across term fields
> ---------------------------------------------------------------------------------------------
>
> Key: LUCENE-8196
> URL: https://issues.apache.org/jira/browse/LUCENE-8196
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Fix For: 7.4
>
> Attachments: LUCENE-8196-debug.patch, LUCENE-8196.patch,
> LUCENE-8196.patch, LUCENE-8196.patch, LUCENE-8196.patch, LUCENE-8196.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This ticket proposes an alternative implementation of the SpanQuery family
> that uses minimum-interval semantics from
> [http://vigna.di.unimi.it/ftp/papers/EfficientAlgorithmsMinimalIntervalSemantics.pdf]
> to implement positional queries across term-based fields. Rather than using
> TermQueries to construct the interval operators, as in LUCENE-2878 or the
> current Spans implementation, we instead use a new IntervalsSource object,
> which will produce IntervalIterators over a particular segment and field.
> These are constructed using various static helper methods, and can then be
> passed to a new IntervalQuery which will return documents that contain one or
> more intervals so defined.
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