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https://issues.apache.org/jira/browse/SOLR-13892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16967757#comment-16967757
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Mikhail Khludnev commented on SOLR-13892:
-----------------------------------------

{!join score=none} switches execution to 
https://github.com/apache/lucene-solr/blob/4f16d87c7ee5d4cf6e335cfd464733b149d62eb5/lucene/join/src/java/org/apache/lucene/search/join/JoinUtil.java#L37
 
as a result of these, complexity of operation is proportional to number of 
values under "from"-side of join. As you remind, classic {!join} complexity is 
proportional of number of terms at "to"-side despite of "from"-side 
selectivity. 

> 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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