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https://issues.apache.org/jira/browse/SOLR-4215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13535804#comment-13535804
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Adrien Grand commented on SOLR-4215:
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Hi Ryan. I think this test should be done on every segment rather than on the
top-level composite reader, because if the index has several segments,
{{terms(field)}} will return a MultiTerms instance whose {{size()}} method
always returns -1?
> Optimize facets when multi-valued field is really single valued
> ---------------------------------------------------------------
>
> Key: SOLR-4215
> URL: https://issues.apache.org/jira/browse/SOLR-4215
> Project: Solr
> Issue Type: Improvement
> Components: SearchComponents - other
> Reporter: Ryan McKinley
> Priority: Minor
> Fix For: 4.1
>
> Attachments: SOLR-4215-check-single-valued.patch
>
>
> In lucene 4+, the Terms interface can quickly tell us if the index is
> actually single-valued. We should use that for better facet performance with
> multi-valued fields (when they are actually single valued)
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