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https://issues.apache.org/jira/browse/SOLR-6234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649878#comment-14649878
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Mikhail Khludnev commented on SOLR-6234:
----------------------------------------
Impl notes:
* toString() is a little bit odd, it looks like
{code}
"debug": {
"rawquerystring": "{!join from=id to=manu_id_s score=max
fromIndex=products}inc",
"querystring": "{!join from=id to=manu_id_s score=max
fromIndex=products}inc",
"parsedquery": "OtherCoreJoinQuery(OtherCoreJoinQuery [fromIndex=products,
fromCoreOpenTime=1438087133575 extends SameCoreJoinQuery [fromQuery=text:inc,
fromField=id, toField=manu_id_s, scoreMode=Max]])",
"parsedquery_toString": "OtherCoreJoinQuery [fromIndex=products,
fromCoreOpenTime=1438087133575 extends SameCoreJoinQuery [fromQuery=text:inc,
fromField=id, toField=manu_id_s, scoreMode=Max]]",
"explain": {
{code}
Let me know if you need to change it.
* for cross core join: when you commit into {{fromIndex}} query cache entry
equality is determined by coreOpenTime() which is obtained from
{{System.currentTimeMillis()}} it might cause some issues on edge
cases/plarforms (that's why it wasn't covered with test), but this approach was
inherited from \{!join}. Raise an issue if it's significant to you.
> 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: Mikhail Khludnev
> Labels: features, patch, test
> Fix For: 5.3
>
> Attachments: SOLR-6234-javadocsfix.patch,
> SOLR-6234-trunk-CHANGES-fix.patch, SOLR-6234.patch, SOLR-6234.patch,
> SOLR-6234.patch, SOLR-6234.patch, SOLR-6234.patch, SOLR-6234.patch,
> SOLR-6234.patch, otherHandler.patch
>
>
> it adds ability to call Lucene's JoinUtil by specifying local param, ie
> \{!join score=...}.... It supports:
> - {{score=none|avg|max|total}} local param (passed as ScoreMode to JoinUtil)
> - -supports {{b=100}} param to pass {{Query.setBoost()}}- postponed till
> SOLR-7814.
> - -{{multiVals=true|false}} is introduced- YAGNI, let me know otherwise.
> - 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
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