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https://issues.apache.org/jira/browse/LUCENE-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665998#action_12665998
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Jason Rutherglen commented on LUCENE-1476:
------------------------------------------

Is there info on the wiki about how to use the contrib/benchmarks? (didn't find 
any)

{quote}
M.M.: "1) Should we switch to iterator only API for accessing deleted docs
(vs random-access API we use today)?"
{quote}

I think we can by default support both. We may want to test (later
on) the difference in speed of iterating over an OpenBitSet vs
BitVector for the deleted docs.

{quote}
M.M.: "2) Should we take deletes into account at a higher level
(BooleanScorer/2, as a top-level Filter) vs the lowest level (each
posting, in SegmentTermDocs that we do today)?"
{quote}

We probably need to support both as implementing top level deleted
docs filtering may have unknown side effects. The user may decide
based on their queries and other variables such as the number of
deleted docs. 


> 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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