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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7939) Speed up MinShouldMatchSumScorer in conjunctions
Date Wed, 23 Aug 2017 17:21:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16138677#comment-16138677
] 

ASF subversion and git services commented on LUCENE-7939:
---------------------------------------------------------

Commit 586270a76990f6462c688e79ab85cf16df28b8a8 in lucene-solr's branch refs/heads/branch_7x
from [~jpountz]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=586270a ]

LUCENE-7939: Speed up MinShouldMatchSumScorer in conjunctions.


> Speed up MinShouldMatchSumScorer in conjunctions
> ------------------------------------------------
>
>                 Key: LUCENE-7939
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7939
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Minor
>             Fix For: master (8.0), 7.1
>
>         Attachments: LUCENE-7939.patch, LUCENE-7939.patch
>
>
> MinShouldMatchSumScorer has good iteration capabilities, but if it is not used as a lead
for the iteration then the advance() call might make a lot of efforts in order to find the
next match while we should instead let the lead iterator of the conjunction skip over non-matching
documents. In this issue I'd like to explore changing MinShouldMatchSumScorer by giving it
a two-phase iterator and making advance() return a candidate for the next match that is less
good but much cheaper to compute.



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