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https://issues.apache.org/jira/browse/LUCENE-6473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward resolved LUCENE-6473.
-----------------------------------
    Resolution: Won't Fix

This isn't necessary due to LUCENE-6371

> Make Spans an interface
> -----------------------
>
>                 Key: LUCENE-6473
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6473
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Alan Woodward
>         Attachments: LUCENE-6473.patch
>
>
> Spans is currently an abstract class, extending DocIdSetIterator.  This 
> restricts what we can do with implementations of Spans.  For example, in 
> LUCENE-6371, it would be useful to have PayloadSpan classes that extend 
> existing Spans implementations, but that also implement a PayloadSpans 
> interface that extends Spans.  This isn't possible if Spans is not an 
> interface itself.



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