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https://issues.apache.org/jira/browse/LUCENE-8386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536402#comment-16536402
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Adrien Grand commented on LUCENE-8386:
--------------------------------------

Sorry for introducing some confusion, when I mentioned Bits-based iterators I 
was thinking of a DocIdSetIterator over a Bits instance that would check bits 
one by one to find the next match rather than an alternative to BitsetIterator.

> Maybe a DocIdSetIterator may implement Bits?
> --------------------------------------------
>
>                 Key: LUCENE-8386
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8386
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>            Reporter: David Smiley
>            Priority: Minor
>
> I was looking at ConjunctionDISI and noted the special case logic for DISI's 
> of type BitSetIterator. It seems to only need the more minimal Bits interface 
> though it makes references to BitSet specifically.   BitSetIterator is a 
> concrete class; it would be nice if a DISI could either implement an optional 
> interface to expose a Bits or perhaps implements Bits directly.  This would 
> allow other/custom DISIs that can implement a Bits quickly without being 
> forced to use BitSetIterator specifically.  Even DocIdSetIterator.all(...) 
> could implement this.



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