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https://issues.apache.org/jira/browse/LUCENE-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665748#action_12665748
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Paul Elschot commented on LUCENE-1476:
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>>> If we move the deletions filtering up, then we'd increase traffic through
>>> that cache
>>
>> OK, right. So we may have some added cost because of this. I think it's only
>> TermScorer that uses the bulk API though.
>The original BooleanScorer also pre-fetches. (That doesn't affect KS because
> ORScorer, ANDScorer, NOTScorer and RequiredOptionScorer (which have
> collectively replaced BooleanScorer) all proceed doc-at-a-time and implement
> skipping.)
For OR like queries, that use Scorer.next(), deletions might be treated as early
as possible, since each hit will cause a matching doc and a corresponding score
calculation.
For AND like queries, that use Scorer.skipTo(), deletions can be treated later,
for example in skipTo() of the conjunction/and/scorer.
In the same way, prefetching into a larger term documents buffer helps for OR
queries,
but gets in the way for AND queries.
> 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,
> 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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