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From "Martijn van Groningen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-2863) Solr 3.4 group.truncate does not work with facet queries
Date Fri, 28 Oct 2011 14:26:32 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13138394#comment-13138394
] 

Martijn van Groningen commented on SOLR-2863:
---------------------------------------------

Ok I get what you mean. I think this is not bug, but rather a missing feature. The type of
post grouped faceting you want isn't yet implemented in Solr / Lucene. In LUCENE-3097 I described
three different post grouping facet types. The one that fits your need (which I call matrix
counts) is not yet implemented. 

The group.truncate only selects for all the groups matching the query the most relevant document
and uses that as base for a facet. Any subsequent documents inside a group are not visible
during faceting.

What is unfortunate is that the combination of group.ngroups and fq does work the way you
want it and thus this explains the difference in facet count and ngroup count.
                
> Solr 3.4 group.truncate does not work with facet queries
> --------------------------------------------------------
>
>                 Key: SOLR-2863
>                 URL: https://issues.apache.org/jira/browse/SOLR-2863
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 3.4
>         Environment: Solr 3.4 on Windows Server 2008.
>            Reporter: Ian Grainger
>              Labels: facet, grouping, query, search, truncate
>
> When using Grouping with group.truncate=true, The following simple facet query:
> facet.query=Monitor_id:[380000 TO 400000]
> Doesn't give the same number as the nGroups result for the equivalent filter query:
> fq=Monitor_id:[380000 TO 400000]
> From the Wiki page: 'group.truncate: If true, facet counts are based on the most relevant
document of each group matching the query.'
> If I turn off group.truncate then the counts are the same, as I'd expect - but unfortunately
I'm only interested in the grouped results.
> Asked this question on the Solr-user mailing list and was told it is likely a bug by:
Martijn Groningen.
> I'd be very interested in any workaround for this bug!

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