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Posted to dev@lucene.apache.org by "Martijn van Groningen (Commented) (JIRA)" <ji...@apache.org> on 2012/02/05 22:29:59 UTC

[jira] [Commented] (LUCENE-3602) Add join query to Lucene

    [ https://issues.apache.org/jira/browse/LUCENE-3602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13200913#comment-13200913 ] 

Martijn van Groningen commented on LUCENE-3602:
-----------------------------------------------

Jason: Better late then never... BRH is used to collect the matching from terms. The DTI just contains all terms / ords for a field. Comparing DTI ords isn't going to work when a term is in more than one segment or appears in a different field (fromField / toField). So I think the BRH can't be replaced by the DTI. The BRH could be cached per query.
                
> Add join query to Lucene
> ------------------------
>
>                 Key: LUCENE-3602
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3602
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: modules/join
>            Reporter: Martijn van Groningen
>             Fix For: 3.6, 4.0
>
>         Attachments: LUCENE-3602-3x.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch, LUCENE-3602.patch
>
>
> Solr has (psuedo) join query for a while now. I think this should also be available in Lucene.  

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