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https://issues.apache.org/jira/browse/SOLR-8235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tom Winch updated SOLR-8235:
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Comment: was deleted
(was: patch against SOLR 4.10.3)
> Federated Search (new) - Merge
> ------------------------------
>
> Key: SOLR-8235
> URL: https://issues.apache.org/jira/browse/SOLR-8235
> Project: Solr
> Issue Type: New Feature
> Reporter: Tom Winch
> Priority: Minor
> Labels: federated_search
> Fix For: 4.10.3
>
> Attachments: SOLR-8235.patch
>
>
> This issue describes a SearchComponent for merging search results obtained
> from a DJoin distributed search (see SOLR-8234) as part of 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.
> In the use of this search component, it is assumed that there is a single
> SOLR server (the "aggregator") that uses distributed search (shards=) to
> collect documents from other SOLR servers using DJoin (see SOLR-8234). The
> DJoin generates a result set containing parent documents each with child
> documents having the same unique id. This merge component turns each set of
> child documents into a single document conforming to the aggregator schema.
> For example, suppose the aggregator schema defines a multi-valued integer
> field, 'num', and three shards return field values "48", 23, and
> "strawberry". Then the resulting merged field value would be [48, 23] and an
> error would included for the NumberFormatException.
> Custom field merge behaviour may be specified by defining custom field types
> in the usual way and this is supported via a MergeAbstractFieldType class.
> This issue combines with others to provide full federated search support. See
> also SOLR-8234 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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