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https://issues.apache.org/jira/browse/LUCENE-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662247#action_12662247
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Doug Cutting commented on LUCENE-1476:
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bq. To really tighten this loop, you have to [ ... ] remove all function/method
call overhead [and] operate directly on the memory mapped postings file.
That sounds familiar...
http://svn.apache.org/viewvc/lucene/java/trunk/src/gcj/org/apache/lucene/index/GCJTermDocs.cc?view=markup
> 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, quasi_iterator_deletions.diff
>
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> BitVector can implement DocIdSet. This is for making
> SegmentReader.deletedDocs pluggable.
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