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From anand chandak <anand.chan...@oracle.com>
Subject Re: solr joins
Date Mon, 03 Feb 2014 07:15:17 GMT
Re-posting, just in case if this one fell through crack.

Thanks,

Anand


On 2/1/2014 12:48 PM, anand chandak wrote:
> Folks, have a basic question regarding solr join, the wiki, 
> <http://wiki.apache.org/solr/Join>  states : -
>
> "Fields or other properties of the documents being joined "from" are 
> not available for use in processing of the resulting set of "to" 
> documents (ie: you can not return fields in the "from" documents as if 
> they were a multivalued field on the "to" documents)".
>
> I am finding it hard to understand the above limitation of solr 
> join,does it means that unlike the traditional RDMS joins that can 
> have columns from both the TO and FROM field, solr joins will only 
> have fields from the TO  documents ? Is my understanding correct ?
>
> Also, there's some difference with respect to scoring and towards that 
> the wiki says :
>
> "The Join query produces constant scores for all documents that match 
> -- scores computed by the nested query for the "from" documents are 
> not available to use in scoring the "to" documents" Does it mean the 
> subquery's score is not available the main query? Is this behaviour 
> true for the lucene join too ?
>
> Basically, i am trying to understand where and how solr joins differ 
> from lucene joins. Any pointers, much appreciated ?
>
> I have posted same question on the stackoverflow 
> <http://stackoverflow.com/questions/21480628/solr-join-vs-lucene-join>
>
> Thanks,
>
> Anand
>
>


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