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https://issues.apache.org/jira/browse/SOLR-6234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14622343#comment-14622343
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Yonik Seeley commented on SOLR-6234:
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bq. Regarding David's comment, what does {!join} do that {!scorejoin} does not?
(besides 4905) if nothing, then it seems to make sense to just replace {!join}
>From an API perspective, nothing that I'm aware of. From an implementation
>perspective, it can be faster or slower depending on the details (it's a
>different implementation). So it makes sense to perhaps consolidate the APIs,
>but keep the different implementations (sort of like facet.method does for
>faceting).
> Scoring modes for query time join
> ----------------------------------
>
> Key: SOLR-6234
> URL: https://issues.apache.org/jira/browse/SOLR-6234
> Project: Solr
> Issue Type: New Feature
> Components: query parsers
> Affects Versions: 5.3
> Reporter: Mikhail Khludnev
> Assignee: Timothy Potter
> Labels: features, patch, test
> Fix For: 5.3
>
> Attachments: SOLR-6234.patch, SOLR-6234.patch, SOLR-6234.patch,
> otherHandler.patch
>
>
> it adds {{scorejoin}} query parser which calls Lucene's JoinUtil underneath.
> It supports:
> - {{score=none|avg|max|total}} local param (passed as ScoreMode to JoinUtil)
> - {{score=none}} is *default*, eg if you *omit* this localparam
> - supports {{b=100}} param to pass {{Query.setBoost()}}.
> - {{multiVals=true|false}} is introduced
> - there is a test coverage for cross core join case.
> - so far it joins string and multivalue string fields (Sorted, SortedSet,
> Binary), but not Numerics DVs. follow-up LUCENE-5868
> -there was a bug in cross core join, however there is a workaround for it-
> it's fixed in Dec'14 patch.
> Note: the development of this patch was sponsored by an anonymous contributor
> and approved for release under Apache License.
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