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https://issues.apache.org/jira/browse/SOLR-3742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490209#comment-13490209
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Ted Strauss commented on SOLR-3742:
-----------------------------------
Group faceting is implemented in SimpleFacets.java in the method - public int
getGroupedFacetQueryCount(Query facetQuery)
To generate the facets for a field, FieldCache is maintained and iterated over.
So for group faceting, a field cache is maintained for group.field. Similarly a
function cache needs to be maintained to be iterated over to create facets and
facet counts. Presently there is no function cache implemented in Lucene
> 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-ALPHA, 4.0-BETA
> 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)
> ...
> The function used can be any function, not product only. 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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