Alan Woodward created LUCENE-8597:
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Summary: 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
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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