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https://issues.apache.org/jira/browse/SOLR-2817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122618#comment-13122618
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Martijn van Groningen commented on SOLR-2817:
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Hi Bronco, this is not a bug. It is just how grouping works. If you want a
grouped total count you need to use:
group.ngroups=true
This will add the number of groups to your result, together with the number of
matches (numFound). The catch is that when you use group.main=true that this
information is not returned to the client (although the group count is
computed). The group.main=true returns the normal response to be compatible
with clients that don't understand the grouped response, the price you pay is
that you don't have access to grouped related information. The numFound has
always returned the number of documents found, not the number of groups found.
I believe for that reason the numFound represents the number of matches and not
number of documents.
I think the best way to fix this is let the Drupal plugin parse the grouped
response (which the default when using grouping). It is very likely that in the
future more grouped related information is added to the grouped response, which
is not available in the normal response.
> Search result with grouping activated delivers wrong numFound value and
> breaks pager.
> -------------------------------------------------------------------------------------
>
> Key: SOLR-2817
> URL: https://issues.apache.org/jira/browse/SOLR-2817
> Project: Solr
> Issue Type: Bug
> Affects Versions: 3.4
> Reporter: bronco
> Priority: Blocker
> Labels: grouping, solr
>
> I use the 3.4 brach of solr for grouping my results, but obviously there is
> something wrong in my eyes. If I activate the grouping functionality I get
> the expected results. In my case for example 4 rows, but the the numFound
> value says it has 26 results.
> This result is used by the Apache Solr Library in Drupal to calculate the
> correct pager on my website. Now I get a search result page with 4 results
> and a confused pager with 3 more steps to not existing search pages.
> I try a lot of things including using a facet and all the other suggested
> things by google but I couldn't change the numFound value to the correct one
> in my case.
> If I not use the group.main=true setting including a facet I get in the facet
> conclusion the correct values of found results but it also say matches 6
> (numFound=6). The Apache Solr Library make it nesessary to use the
> group.main=true setting because without this value the library is not able to
> parse the resultset. So I get always an empty website without any results
> even solr answers correctly.
> Is it somehow possible to change the numFound value to the correct one of the
> group count result. I think nobody groups a field and shows maybe 10 entries
> which belong to the request and tell the user we have 200 other things which
> are not interesting you. But I have to tell you...
> Any help is apreciated to get some understanding why solr delivers me this
> numFound result and how to fix this issue.
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