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From "Yonik Seeley (JIRA)" <>
Subject [jira] Commented: (SOLR-2272) Join
Date Fri, 25 Feb 2011 19:22:21 GMT


Yonik Seeley commented on SOLR-2272:

bq. I don't think that would really work if it is a one to many relationship but thank you
for your response!

I don't see why not... the disadvantages of having everything in a single index are:
- you can't use the same field name for different things, they must be the same type
- efficiency and sparse fields - sorting on a field takes some memory for every document in
the index, regardless of how many documents have that field

Perhaps you could give a small example of how something could work in 2 indexes but not 1?

> Join
> ----
>                 Key: SOLR-2272
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Yonik Seeley
>             Fix For: 4.0
>         Attachments: SOLR-2272.patch, 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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