Question

I need to do a Solr sub-query, which if it was in MySQL would look like so:

SELECT *
FROM solr_index
WHERE type = 'person' AND 
city IN (SELECT name FROM solr_index WHERE name = 'London' AND type = 'city')

Apparently Solr Joins are very similar – http://wiki.apache.org/solr/Join. But these are only available in Solr 4 it seems. Is there some way I can do this in Solr 3.X ?

Ideally a way compatible with the ComplexPhraseQueryParser and that the Solr PHP Client or Solarium have support for.

Any help is greatly appreciated.

UPDATE:

Another example which is not location related:

SELECT *
FROM solr_index
WHERE type = 'project' AND 
tag IN (SELECT name FROM solr_index WHERE name = 'Elephant' AND type = 'tag')

Answer 1

joins are there since solr 3.4. Check this out

http://lucidworks.com/blog/lucene_3_4_0/