[jira] [Commented] (LUCENE-8612) Add the ability to enforce gaps between intervals

["Alan Woodward (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-8612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16723044#comment-16723044 ] 

Alan Woodward commented on LUCENE-8612:
---------------------------------------

Here is a patch adding {{Intervals.extend(source, before, after)}}, which allows you to make an interval cover extra positions before and after the actual terms.  To search for {{a [space] b [space] c}}, for example, you could call {{Intervals.phrase(Intervals.term("a"), Intervals.extend(Intervals.term("b", 1, 1)), Intervals.term("c")}}

The patch also clarifies the javadocs for how IntervalIterator should report start() and end() after the interval has been exhausted for the current document (important for the unordered algorithm), and fixes IntervalMatches to report start and end positions from its underlying IntervalIterator, rather than any wrapped Matches - for most iterators they are the same, but for ExtendedIntervalIterator we need to report the extended bounds so that phrase queries will still correctly report matches.

> Add the ability to enforce gaps between intervals
> -------------------------------------------------
>
>                 Key: LUCENE-8612
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8612
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>            Priority: Major
>         Attachments: LUCENE-8612.patch
>
>
> At the moment you can search for intervals with a maximum number of positions between them, but you cannot enforce gaps.  It would be useful to be able to search for `a b [2 spaces] c`.



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