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https://issues.apache.org/jira/browse/LUCENE-8597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward resolved LUCENE-8597.
-----------------------------------
Resolution: Fixed
Fix Version/s: master (8.0)
Thanks [~jim.ferenczi]!
> Allow filtering of Intervals by their internal gaps
> ---------------------------------------------------
>
> Key: LUCENE-8597
> URL: https://issues.apache.org/jira/browse/LUCENE-8597
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Fix For: master (8.0)
>
> Attachments: LUCENE-8597.patch
>
>
> We currently allow filtering of intervals by their total size, via the
> `Intervals.maxwidth` static method. This works well enough, but there are
> several cases where you might want to restrict the gap between two intervals,
> but don't necessarily know the total width. For example, if you want to know
> that an unordered pair `term1 term2` with no width restriction is less than
> two positions away from another term: there is no current way to construct an
> interval query that would return this.
> To enable this, I propose adding a `gaps()` method to IntervalIterator, which
> returns the number of internal gaps between the iterators constituent
> sub-iterators. Terms and phrases, would return 0, and ordered/unordered
> combinations would return the number of positions separating their immediate
> children. Note that this does not include the gaps within any of those
> children themselves.
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