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https://issues.apache.org/jira/browse/SOLR-3960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man updated SOLR-3960:
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    Attachment: SOLR-3960.patch

grouping and postfilters are two areas of internals that i'm not really 
familiar with, but based on Nathan's problem description and great job pointing 
out the methods he noticed not playing nicely, i was able to create a test case 
demonstrating the problem, and then take a blind stab at a fix.

would definitely appreciate more eyeballs on this
                
> Searching: PostFilter plugins ignored by solr cloud for queries with grouping
> -----------------------------------------------------------------------------
>
>                 Key: SOLR-3960
>                 URL: https://issues.apache.org/jira/browse/SOLR-3960
>             Project: Solr
>          Issue Type: Bug
>          Components: search, SolrCloud
>    Affects Versions: 4.0-BETA
>         Environment: Linux / jre 1.6
>            Reporter: Nathan Visagan
>              Labels: patch
>         Attachments: SOLR-3960.patch
>
>
> When specifying the cloud options (-DzkRun -DnumShards=n) in solr startup 
> parameters, solr search does not consider any PostFilters.
> For example, I have implemented a PostFilter and wrapped that in my 
> QParserPlugin sub class. Then in the solr query I am using fq to apply post 
> filtering by specifying fq={!pf1} where pf1 is the name of my QParserPlugin. 
> This all works well in solr and not in solr cloud. 
> I debugged and figured out that org.apache.solr.search.Grouping.execute() 
> method is called by the non cloud instance. This considers pf.PostFilter 
> which is the collection of all PostFilters whereas 
> org.apache.solr.search.grouping.CommandHandler.execute() which is called by 
> the solr cloud instance ignores the pf.PostFilter.

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