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https://issues.apache.org/jira/browse/SOLR-1650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789770#action_12789770
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patrick o'leary commented on SOLR-1650:
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Can we ensure that function queries have an isCachable method?
Distance functions can have a lot of uniqueness (think dragging on a map for 
setting the center) with a lot of distances attached. 

Having a generic cache means setting a low cache to avoid distance bloating, 
would mean lowering the value for other functions queries wanting to use that 
cache.

> Consider being able to cache function results per request
> ---------------------------------------------------------
>
>                 Key: SOLR-1650
>                 URL: https://issues.apache.org/jira/browse/SOLR-1650
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Grant Ingersoll
>             Fix For: 1.5
>
>
> Once we can sort, filter and boost by functions, it may be the case that the 
> same function is executed for the same value over and over again.  Consider 
> ways to cache this information.

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