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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2013/07/15 23:44:48 UTC

[jira] [Created] (LUCENE-5115) Make WAH8DocIdSet compute its cardinality at building time and use it for cost()

Adrien Grand created LUCENE-5115:
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             Summary: 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


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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