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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7330) Speed up conjunctions
Date Tue, 14 Jun 2016 08:11:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15329073#comment-15329073
] 

Adrien Grand commented on LUCENE-7330:
--------------------------------------

Nightly benchmarks seem to confirm the speedup is real: http://people.apache.org/~mikemccand/lucenebench/AndHighHigh.html

> Speed up conjunctions
> ---------------------
>
>                 Key: LUCENE-7330
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7330
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-7330.patch
>
>
> I am digging into some performance regressions between 4.x and 5.x which seem to be due
to how we always run conjunctions with ConjunctionDISI now while 4.x had FilteredQuery, which
was optimized for the case that there are only two clauses or that one of the clause supports
random access. I'd like to explore the former in this issue.



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