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From "Yonik Seeley (JIRA)" <>
Subject [jira] [Commented] (SOLR-2564) Integrating grouping module into Solr 4.0
Date Mon, 06 Jun 2011 14:20:00 GMT


Yonik Seeley commented on SOLR-2564:

bq. > The other use-case is more like field collapsing and does change what documents match
(basically, only the first documents in each group, up to limit, "match").

bq. I'm not sure it's that simple, ie that we can so cleanly model collapsing as reducing
the docs to consider and then running faceting on that reduced set.

I *think* that's what was actually implemented in SOLR-236 IIRC, and what some people seem
to be asking for.

bq. EG, the use case of getting correct facet counts for a field that has different values
within the group, can't be handled by this approach?

Well, correct is a matter of context ;-) (for example, some have called the facet counts for
the current grouping implementation "incorrect" because it didn't happen to match their use
case).  Looking at the original description in LUCENE-3097, it seems you're talking about
Martijn's 3rd method, while I was talking about the 2nd.  But maybe some people that were
originally advocating for #2, really wanted #3?

> Integrating grouping module into Solr 4.0
> -----------------------------------------
>                 Key: SOLR-2564
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Martijn van Groningen
>            Assignee: Martijn van Groningen
>             Fix For: 4.0
>         Attachments: LUCENE-2564.patch, SOLR-2564.patch, SOLR-2564.patch, SOLR-2564.patch,
> Since work on grouping module is going well. I think it is time to wire this up in Solr.
> Besides the current grouping features Solr provides, Solr will then also support second
pass caching and total count based on groups.

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