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https://issues.apache.org/jira/browse/SOLR-6234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14057188#comment-14057188
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Mikhail Khludnev commented on SOLR-6234:
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[~jacklo]
I still think we need to *add* this QParse for Solr users, *rather than
decommission the current Solr join*. I agree its' code is not easy to read, but
I suppose it performs better in certain cases, and/or consume fewer memory than
straightforward JoinUtil.
re LUCENE-3759 : I don't believe that true distributed join performs well for
practical usage (here I agree with Yonik's comment at SOLR-4905). As far as I
understand, what you've done in SOLR-4905 allows to do _collocated join_ even
with multiple shards ie. if we place _from_ and _to_ side documents at the same
shard, it's able to join them. I think it's what we need.
> 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: 5.0, 4.10
> Reporter: Mikhail Khludnev
> Attachments: lucene-join-solr-query-parser-0.0.2.zip
>
>
> 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),
> also
> - supports {{b=100}} param to pass {{Query.setBoost()}}.
> So far
> - it always passes {{multipleValuesPerDocument=true}}
> - it doesn't cover cross core join case, I just can't find the multicore
> testcase in Solr test, I appreciate if you point me on one.
> - I attach standalone plugin project, let me know if somebody interested, I
> convert it into the proper Solr codebase patch. Also please mention the
> blockers!
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