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https://issues.apache.org/jira/browse/LUCENE-8597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16722459#comment-16722459
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ASF subversion and git services commented on LUCENE-8597:
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Commit dae3e304a17502e85cea5d10166aed20ac99c078 in lucene-solr's branch
refs/heads/master from [~romseygeek]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=dae3e30 ]
LUCENE-8597: TestIntervals.assertGaps() needs to take docBase into account
> 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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