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https://issues.apache.org/jira/browse/SOLR-6234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14622426#comment-14622426
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Mikhail Khludnev commented on SOLR-6234:
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bq. it may be easiest for JoinQParser to detect "score=..." and delegate
+1
bq. the "multiVals=true|false" parameter is supposed to do?
it's just exposing JoinUtil.createJoinQuery() functionality, it implies that
fromField is multivalue SortedSetDV and these values are looped.
bq. exactly what query is the boost applied to
this parser calls JoinUtil.createJoinQuery() and then calls setBoost() on its'
result.
bq. why aren't we using standard boosting mechanisms?
I might be unaware of 'standard boosting mechanisms' I only aware about
\{!boost but people ask for more sugar.
> 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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