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https://issues.apache.org/jira/browse/LUCENE-730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489199
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Otis Gospodnetic commented on LUCENE-730:
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Paul, what is special about the number 32 here (BooleanScorer2):
+ if ((requiredScorers.size() == 0) &&
+ prohibitedScorers.size() < 32) {
+ // fall back to BooleanScorer, scores documents somewhat out of order
+ BooleanScorer bs = new BooleanScorer(getSimilarity(), minNrShouldMatch);
Why can we use BooleanScorer if there are less than 32 prohibited clauses, but
not otherwise? Thanks.
> Restore top level disjunction performance
> -----------------------------------------
>
> Key: LUCENE-730
> URL: https://issues.apache.org/jira/browse/LUCENE-730
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Paul Elschot
> Priority: Minor
> Attachments: TopLevelDisjunction20061127.patch
>
>
> This patch restores the performance of top level disjunctions.
> The introduction of BooleanScorer2 had impacted this as reported
> on java-user on 21 Nov 2006 by Stanislav Jordanov.
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