Yonik Seeley commented on SOLR-1875:

OK, so the idea is pretty simple: reuse the existing algorithm for single 
valued string fields that uses the FieldCache.
Count per-segment with a per-segment accumulator array, then merge all of the 
counts at the end (probably with a priority queue - same method used in 
MultiTermEnum).  Seems like a good opportunity to introduce some threading and 
do the per-segment counting in parallel.

> per-segment single valued string faceting
> -----------------------------------------
>                 Key: SOLR-1875
>                 URL: https://issues.apache.org/jira/browse/SOLR-1875
>             Project: Solr
>          Issue Type: New Feature
>    Affects Versions: 3.1
>            Reporter: Yonik Seeley
>            Assignee: Yonik Seeley
> A little stepping stone to NRT:
> Per-segment single-valued string faceting using the Lucene FieldCache.

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