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Posted to dev@lucene.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2018/08/01 08:05:00 UTC
[jira] [Commented] (LUCENE-8060) Enable top-docs collection
optimizations by default
[ https://issues.apache.org/jira/browse/LUCENE-8060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16564923#comment-16564923 ]
ASF subversion and git services commented on LUCENE-8060:
---------------------------------------------------------
Commit 99dbe936818add5723f2014a90bd0ea8a17c8f19 in lucene-solr's branch refs/heads/master from [~jpountz]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=99dbe93 ]
LUCENE-8060: IndexSearcher's search and searchAfter methods now only compute total hit counts accurately up to 1,000.
> Enable top-docs collection optimizations by default
> ---------------------------------------------------
>
> Key: LUCENE-8060
> URL: https://issues.apache.org/jira/browse/LUCENE-8060
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: master (8.0)
>
> Attachments: LUCENE-8060.patch
>
>
> We are getting optimizations when hit counts are not required (sorted indexes, MAXSCORE, short-circuiting of phrase queries) but our users won't benefit from them unless we disable exact hit counts by default or we require them to tell us whether hit counts are required.
> I think making hit counts approximate by default is going to be a bit trappy, so I'm rather leaning towards requiring users to tell us explicitly whether they need total hit counts. I can think of two ways to do that: either by passing a boolean to the IndexSearcher constructor or by adding a boolean to all methods that produce TopDocs instances. I like the latter better but I'm open to discussion or other ideas?
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