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https://issues.apache.org/jira/browse/SOLR-8234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tom Winch updated SOLR-8234:
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Attachment: SOLR-8234.patch
Patch against 4.10.3
> Federated Search (new) - DJoin
> ------------------------------
>
> Key: SOLR-8234
> URL: https://issues.apache.org/jira/browse/SOLR-8234
> Project: Solr
> Issue Type: New Feature
> Reporter: Tom Winch
> Priority: Minor
> Labels: federated_search
> Fix For: 4.10.3
>
> Attachments: SOLR-8234.patch
>
>
> This issue describes a MergeStrategy implementation (DJoin) to facilitate
> federated search - that is, distributed search over documents stored in
> separated instances of SOLR (for example, one server per continent), where a
> single document (identified by an agreed, common unique id) may be stored in
> more than one server instance, with (possibly) differing fields and data.
> When the MergeStrategy is used in a request handler (via the included
> QParser) in combination with distributed search (shards=), documents having
> an id that has already been seen are not discarded (as per the default
> behaviour) but, instead, are collected and returned as a group of documents
> all with the same id taking a single position in the result set (this is
> implemented using parent/child documents).
> Documents are sorted in the result set based on the highest ranking document
> with the same id. It is possible for a document ranking high in one shard to
> rank very low on another shard. As a consequence of this, all shards must be
> asked to return the fields for every document id in the result set (not just
> of those documents they returned), so that all the component parts of each
> document in the search result set are returned.
> This issue combines with others to provide full federated search support. See
> also SOLR-8235 and SOLR-8236.
> --
> Note that this is part of a new implementation of federated search as opposed
> to the older issues SOLR-3799 through SOLR-3805.
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