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https://issues.apache.org/jira/browse/SOLR-669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jan Høydahl closed SOLR-669.
----------------------------

    Resolution: Won't Fix

Changed resolution state to "Won't fix". It appears this is not a feature 
anyone finds useful enough to even comment on, far less contribute to for 
almost 5 years, so to me that's a theoretical need, not a real one. Please 
re-open if you (or anyone else) want to see this solved.
                
> SOLR currently does not support caching for (Query, FacetFieldList)
> -------------------------------------------------------------------
>
>                 Key: SOLR-669
>                 URL: https://issues.apache.org/jira/browse/SOLR-669
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 1.3
>            Reporter: Fuad Efendi
>   Original Estimate: 1,680h
>  Remaining Estimate: 1,680h
>
> It is huge performance bottleneck and it describes huge difference between 
> qtime and SolrJ's elapsedTime. I quickly browsed SolrIndexSearcher: it caches 
> only (Key, DocSet/DocList <Lucene Ids>) key-value pairs and it does not have 
> cache for (Query, FacetFieldList).
> filterCache stores DocList for each 'filter' and is used for constant 
> recalculations...
> This would be significant performance improvement.

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