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https://issues.apache.org/jira/browse/SOLR-2272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yonik Seeley updated SOLR-2272:
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Attachment: SOLR-2272.patch
Here's a patch with tests that implements the first algorithm for joining (just
as in faceting, there will be multiple going forward).
This implements a many-to-many join - documents are mapped based on matching
terms in index fields. It's all on the fly, so nothing to declare up front.
You can look at the tests for examples on how to use this.
Another example: to find the parents of all blue-eyed children, simply do
fq={!join from=parent to=name}eyes:blue
Or, you can join in the reverse direction to find the children of all blue
eyed parents
fq={!join from=name to=parent}eyes:blue
Or you can even do a self-join to find everyone with the same eye color as
johnny, without knowing what that is
fq={!join from=eyes to=eyes}name:johnny
This current algorithm is like facet.method=enum - it's more efficient when
there are fewer terms in the fields being joined.
> Join
> ----
>
> Key: SOLR-2272
> URL: https://issues.apache.org/jira/browse/SOLR-2272
> Project: Solr
> Issue Type: New Feature
> Reporter: Yonik Seeley
> Fix For: 4.0
>
> Attachments: SOLR-2272.patch
>
>
> Limited join functionality for Solr, mapping one set of IDs matching a query
> to another set of IDs, based on the indexed tokens of the fields.
> Example:
> fq={!join from=parent_ptr to:parent_id}child_doc:query
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