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https://issues.apache.org/jira/browse/LUCENE-8306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16548104#comment-16548104
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Jim Ferenczi commented on LUCENE-8306:
--------------------------------------

Would it be easier if getSubMatches returns null when matches are already 
leaves ? I look at this sub matches as a way to split a big interval so it 
should be possible to split at multiple levels. I don't think we should assume 
that the first level is a top level and the next level is always for terms, 
e.g. if the top level matches is already a term, getSubMatches should return 
null or EMPTY. 

> Allow iteration over the term positions of a Match
> --------------------------------------------------
>
>                 Key: LUCENE-8306
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8306
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>            Priority: Major
>         Attachments: LUCENE-8306.patch, LUCENE-8306.patch, LUCENE-8306.patch
>
>
> For multi-term queries such as phrase queries, the matches API currently just 
> returns information about the span of the whole match.  It would be useful to 
> also expose information about the matching terms within the phrase.  The same 
> would apply to Spans and Interval queries.



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