FYI, If denormalization doesn't work for you, check index time join http://blog.mikemccandless.com/2012/01/searching-relational-content-with.html. here is the scratch for query and index time support: https://issues.apache.org/jira/browse/SOLR-3076 https://issues.apache.org/jira/browse/SOLR-3535
On Wed, Jun 27, 2012 at 3:47 PM, Lee Carroll <lee.a.carr...@googlemail.com>wrote: > Sorry you have that link! and I did not see the question - apols > > index schema could look something like: > > id > name > classList -> multi value > majorClassList -> multi value > > a standard query would do the equivalent of your sql > > again apols for not seeing the link > > lee c > > > > On 27 June 2012 12:37, Lee Carroll <lee.a.carr...@googlemail.com> wrote: > > In your example de-normalising would be fine in a vast number of > > use-cases. multi value fields are fine. > > > > If you really want to, see http://wiki.apache.org/solr/Join but make > > sure you loose the default relational dba world view first > > and only go down that route if you need to. > > > > > > > > On 27 June 2012 12:27, Robert Yu <robert...@morningstar.com> wrote: > >> The ability of join operation supported as what > http://wiki.apache.org/solr/Join says is so limited. > >> I'm thinking how to support standard join operation in Solr/Lucene > because not all can be de-normalized efficiently. > >> > >> Take 2 schemas below as an example: > >> > >> (1) Student > >> sid > >> name > >> cid // class id > >> > >> (2) class > >> > >> cid > >> > >> name > >> > >> major > >> In SQL, it will be easy to get all students' name and its class name > where student's name start with 'p' and class's major is "CS". > >> Select s.name, c.name from student s, class c where s.namelike > >> 'p%' and c.major = "CS". > >> > >> How Solr/Lucene support the above query? It seems they do not. > >> > >> Thanks, > >> ________________________________ > >> Robert Yu > >> Application Service - Backend > >> Morningstar Shenzhen Ltd. > >> Morningstar. Illuminating investing worldwide. > >> > >> +86 755 3311-0223 voice > >> +86 137-2377-0925 mobile > >> +86 755 0000-0000 fax > >> robert...@morningstar.com<mailto:robert...@morningstar.com> > >> 8FL, Tower A, Donghai International Center ( or East Pacific > International Center) > >> 7888 Shennan Road, Futian district, > >> Shenzhen, Guangdong province, China 518040 > >> > >> http://cn.morningstar.com<http://cn.morningstar.com/> > >> > >> This e-mail contains privileged and confidential information and is > intended only for the use of the person(s) named above. Any dissemination, > distribution, or duplication of this communication without prior written > consent from Morningstar is strictly prohibited. If you have received this > message in error, please contact the sender immediately and delete the > materials from any computer. > >> > -- Sincerely yours Mikhail Khludnev Tech Lead Grid Dynamics <http://www.griddynamics.com> <mkhlud...@griddynamics.com>
