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Posted to issues@lucene.apache.org by "Mikhail Khludnev (Jira)" <ji...@apache.org> on 2019/11/04 18:25:00 UTC
[jira] [Commented] (SOLR-13892) Add postfilter support to {!join}
queries
[ https://issues.apache.org/jira/browse/SOLR-13892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16966891#comment-16966891 ]
Mikhail Khludnev commented on SOLR-13892:
-----------------------------------------
Hello, [~gerlowskija].
The concern is that such post filtering doesn't make much gain after "to"-side bitset is calculated eagerly (real lazy "exists"-kind of join is aside from it). What I saw in the patch if what we already have in Lucene's JoinUtil, and what's switched on by \{!join .. score=none} SOLR-6234, there should be even something in ref guide. I also agree with [~jpountz] that it's worth to use TwoPhase matching in new code rather than old postfiltering.
Thanks
> Add postfilter support to {!join} queries
> -----------------------------------------
>
> Key: SOLR-13892
> URL: https://issues.apache.org/jira/browse/SOLR-13892
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: query parsers
> Affects Versions: master (9.0)
> Reporter: Jason Gerlowski
> Priority: Major
> Attachments: SOLR-13892.patch
>
>
> The JoinQParserPlugin would be a lot performant in many use-cases if it could operate as a post-filter, especially when doc-values for the involved fields are available.
> With this issue, I'd like to propose a post-filter implementation for the {{join}} qparser.
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