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https://issues.apache.org/jira/browse/LUCENE-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665931#action_12665931
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Jason Rutherglen commented on LUCENE-1476:
------------------------------------------

{quote}
M.M.: "At a higher level, I'd imagine we'd want to store the deleted doc IDs as 
an
integer array rather than a BitVector if there aren't very many of them. But
I think that will mess with the random access required by
IndexReader.isDeleted()."
{quote}

Indeed, how should we solve isDeleted for the tombstones
implementation? Or do we simply assume it will be slow (requiring a
linear scan?) Or perhaps borrow from Solr's HashDocSet (a minimal
primitive int based hash) to implement?

> BitVector implement DocIdSet, IndexReader returns DocIdSet deleted docs
> -----------------------------------------------------------------------
>
>                 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, LUCENE-1476.patch, LUCENE-1476.patch, 
> quasi_iterator_deletions.diff, quasi_iterator_deletions_r2.diff
>
>   Original Estimate: 12h
>  Remaining Estimate: 12h
>
> Update BitVector to implement DocIdSet.  Expose deleted docs DocIdSet from 
> IndexReader.

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