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https://issues.apache.org/jira/browse/SOLR-13375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16888903#comment-16888903
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ASF subversion and git services commented on SOLR-13375:
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Commit 785b658427f75a46d6a94b426b16bf952152711a in lucene-solr's branch
refs/heads/master from Gus Heck
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=785b658 ]
SOLR-13375 - CHANGES.txt entry
> 2 Dimensional Routed Aliases
> ----------------------------
>
> Key: SOLR-13375
> URL: https://issues.apache.org/jira/browse/SOLR-13375
> Project: Solr
> Issue Type: New Feature
> Components: SolrCloud
> Affects Versions: master (9.0)
> Reporter: Gus Heck
> Assignee: Gus Heck
> Priority: Major
> Attachments: SOLR-13375.patch, SOLR-13375.patch, SOLR-13375.patch,
> SOLR-13375.patch, SOLR-13375.patch
>
>
> Current available routed aliases are restricted to a single field. This
> feature will allow Solr to provide data driven collection access, creation
> and management based on multiple fields in a document. The collections will
> be queried and updated in a unified manner via an alias. Current routing is
> restricted to the values of a single field. The particularly useful
> combination at this time will be Category X Time routing but Category X
> Category may also be useful. More importantly, if additional routing schemes
> are created in the future (either as contributions or as custom code by
> users) combination among these should be supported.
> It is expected that not all combinations will be useful, and that
> determination of usefulness I expect to leave up to the user. Some Routing
> schemes may need to be limited to be the leaf/last routing scheme for
> technical reasons, though I'm not entirely convinced of that yet. If so, a
> flag will be added to the RoutedAlias interface.
> Initial desire is to support two levels, though if arbitrary levels can be
> supported easily that will be done.
> This could also have been called CompositeRoutedAlias, but that creates a TLA
> clash with CategoryRoutedAlias.
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