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https://issues.apache.org/jira/browse/LUCENE-5115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709615#comment-13709615
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ASF subversion and git services commented on LUCENE-5115:
---------------------------------------------------------
Commit 1503619 from [~jpountz] in branch 'dev/branches/branch_4x'
[ https://svn.apache.org/r1503619 ]
LUCENE-5115: WAHDocIdSet's iterator cost() function now returns the exact
cardinality of the set.
> Make WAH8DocIdSet compute its cardinality at building time and use it for
> cost()
> --------------------------------------------------------------------------------
>
> Key: LUCENE-5115
> URL: https://issues.apache.org/jira/browse/LUCENE-5115
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-5115.patch
>
>
> DocIdSetIterator.cost() accuracy can be important for the performance of some
> queries (eg.ConjunctionScorer). Since WAH8DocIdSet is immutable, we could
> compute its cardinality at building time and use it for the cost function.
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