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https://issues.apache.org/jira/browse/SOLR-14692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17168222#comment-17168222
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Jason Gerlowski commented on SOLR-14692:
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I've create an initial pass at this in the PR 
[here|https://github.com/apache/lucene-solr/pull/1707].  I still need to work 
through documentation, tests, and do a few sanity checks on the join queries 
that are created as a result of this new "method" property.  But the bones of 
the implementation were pretty straightforward.

> JSON Facet "join" domain should take optional "method" property
> ---------------------------------------------------------------
>
>                 Key: SOLR-14692
>                 URL: https://issues.apache.org/jira/browse/SOLR-14692
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: faceting, JSON Request API
>    Affects Versions: master (9.0), 8.6
>            Reporter: Jason Gerlowski
>            Priority: Minor
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Solr offers several different join implementations which can be switched off 
> providing the "method" local-param on JoinQuery's.  Each of these 
> implementations has different performance characteristics and can behave very 
> differently depending on a user's data and use case.
> When joins are used internally as a part of JSON Faceting's "join" 
> domain-transform though, users have no way to specify which implementation 
> they would like to use.  We should correct this by adding a "method" property 
> to the join domain-transform.  This will let user's choose the join that's 
> most performant for their use case during JSON Facet requests.



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