CP created SOLR-3742:
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             Summary: group.func and group.facet do not work together
                 Key: SOLR-3742
                 URL: https://issues.apache.org/jira/browse/SOLR-3742
             Project: Solr
          Issue Type: Bug
          Components: search
    Affects Versions: 4.0-BETA, 4.0-ALPHA
            Reporter: CP


When doing a search like 

http://localhost:8983/solr/select?group=true&group.func=product(fildname1, 
fieldname2)&group.facet=true&facet=true&facet.field=fieldname3

an error is returned in response where facets are normally returned:

java.lang.ArrayIndexOutOfBoundsException: 0 at 
org.apache.solr.request.SimpleFacets.getGroupedCounts(SimpleFacets.java:358) ...

There is no such error if group.facet is omitted or group.field is used instead 
of group.func. It seems that group.field parameter is expected to be defined 
when calculating grouped facets.

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