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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-2272) Join
Date Mon, 13 Dec 2010 23:10:06 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971070#action_12971070
] 

Yonik Seeley commented on SOLR-2272:
------------------------------------

bq.  Yonik, that feature is pretty interesting, but sounds more like a mapping or replacement
than a join to me... 

Yeah, I agree.. it's closer to a semi-join http://en.wikipedia.org/wiki/Hash_join#Hash_semi-join
I experimented with calling it pivot or map, but I think this type of semantic is realistically
the closest we'll get to a join.

bq. Unfortunatelly, I thought I'd be able to perform search restrictions on the union produced
by the join, but I wasn't able to do so

This is mapping from one id space to another, so you need to filter in the appropriate space.
You're doing a self-join here, so it's a more complex example to figure out.
What about something like:
q={!join from=pivot to=pivot}price:[* TO 200]&fq=title:great
?

> 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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