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https://issues.apache.org/jira/browse/LUCENE-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653915#action_12653915
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Michael McCandless commented on LUCENE-1476:
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bq. but IndexReader.document throws an exception if the document is deleted...0 
so you still need random access 

Does it really need to throw an exception?  (Of course for back compat it does, 
but we could move away from that to a new method that doesn't check).

> BitVector implement DocIdSet
> ----------------------------
>
>                 Key: LUCENE-1476
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1476
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.4
>            Reporter: Jason Rutherglen
>            Priority: Trivial
>         Attachments: LUCENE-1476.patch
>
>   Original Estimate: 12h
>  Remaining Estimate: 12h
>
> BitVector can implement DocIdSet.  This is for making 
> SegmentReader.deletedDocs pluggable.

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