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https://issues.apache.org/jira/browse/LUCENE-8422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16552585#comment-16552585
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Alan Woodward commented on LUCENE-8422:
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Here is a patch that adds a collection interface to IntervalIterators, and uses
that to drive Matches iteration and sub-iteration. There's a lot of shared
code with Spans here, so I've extracted the common parts out into an
InnerMatchesIterator in core.
Some intervals (ordered and unordered) eagerly advance the first sub-interval
within a match to ensure that matches are minimal, which means we need to cache
the collected intervals. Because this might be expensive, I've added a new
boolean to IntervalsSource.intervals() which tells the iterator up-front
whether or not it needs to use a cache. This is checked using assertions at
the moment, but it might be better to throw IllegalStateException if collect()
is called on an iterator generated without a cache.
> Add Matches iteration to interval queries
> -----------------------------------------
>
> Key: LUCENE-8422
> URL: https://issues.apache.org/jira/browse/LUCENE-8422
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Attachments: LUCENE-8422.patch
>
>
> Follow up to LUCENE-8404, we can now add Matches iteration to interval
> queries in the sandbox.
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