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https://issues.apache.org/jira/browse/LUCENE-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662110#action_12662110
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Marvin Humphrey commented on LUCENE-1476:
-----------------------------------------

Mike McCandless:

> if it's sparse, you need an iterator (state) to remember where you are.

We can hide the sparse representation and the internal state, having the
object lazily build the a non-sparse representation.  That's what I had in
mind with the code for TombstoneDelEnum.nextDeletion().
TombstoneDelEnum.nextInternal() would be a private method used for building up
the internal BitVector.

> 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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