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From Apache Wiki <>
Subject [Solr Wiki] Update of "Join" by HossMan
Date Tue, 27 Sep 2011 18:46:27 GMT
Dear Wiki user,

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The "Join" page has been changed by HossMan:

some in depth examples explaining usage

  In many cases, documents have relationships between them and it is too expensive to denormalize
them.  Thus, a join operation is needed.  Preserving the document relationship allows documents
to be updated independently without having to reindex large numbers of denormalized documents.
  = Quick Start =
+ /!\ '''NOTE:''' The "browse" example of join doesn't seem to be working with the 4x example
velocity templates as of 2011-09-27
   * Follow the Tutorial at to get setup
   * Point your browser at http://localhost:8983/solr/browse?&queryOpts=join
@@ -23, +25 @@

  = Examples =
+ In the example data, product all documents have a unique "id" field, but documents modeling
products also have a "manu_id_s" which is essentially a "foreign key" to the "id" of the associated
manufacturer doc.
+  * Find all product docs matching "ipod", then join them against (manufacturer) docs and
return the list of manufactures that make those products
+    * http://localhost:8983/solr/select?q={!join+from=manu_id_s+to=id}ipod
+  * Find all manufacturer docs named "belkin", then join them against (product) docs and
return the list of products produced by that manufacturer...
+    * http://localhost:8983/solr/select?q={!join+from=id+to=manu_id_s}compName_s:Belkin
+  * Find all manufacturer docs named "belkin", then join them against (product) docs and
filter that list to only products with a price less then 12 dollars...
+    * http://localhost:8983/solr/select?q={!join+from=id+to=manu_id_s}compName_s:Belkin&fq=price:%5B%2A+TO+12%5D
+  * Find all products matching ipod (sorted by score) and filter that by the set of products
produced by joining manufacturers named "Belkin" or "Apple"
+    * http://localhost:8983/solr/select?q=ipod&fl=*,score&sort=score+desc&fq={!join+from=id+to=manu_id_s}compName_s:Belkin
  = Background =
   * See for the original patch

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