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https://issues.apache.org/jira/browse/LUCENE-8127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361040#comment-16361040
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ASF subversion and git services commented on LUCENE-8127:
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Commit 9d66dc27328816a845d4f448bf2efa33f289207e in lucene-solr's branch
refs/heads/branch_7x from [~jpountz]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=9d66dc2 ]
LUCENE-8127: Speed up rewriteNoScoring when there are no MUST clauses.
> BooleanQuery with needsScores=false, rewriteNoScoring improvement
> -----------------------------------------------------------------
>
> Key: LUCENE-8127
> URL: https://issues.apache.org/jira/browse/LUCENE-8127
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael Braun
> Priority: Minor
> Attachments: LUCENE-8127.patch
>
>
> In the case needsScores=false, createWeight calls rewriteNoScoring before
> creating a new BooleanWeight. This in all cases creates a new BooleanQuery,
> even when it's not necessary (aka there are no MUST clauses).
> The rewriteNoScoring method could check for something as simple as if
> (clauseSets.get(Occur.MUST).size() > 0) before creating a brand new
> BooleanQuery.
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