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https://issues.apache.org/jira/browse/SOLR-6216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14070457#comment-14070457
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Tomás Fernández Löbbe commented on SOLR-6216:
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Great, thanks Erick. I'll create a Jira for the LocalParam behavior I mentioned
before (override the interval key)
> Better faceting for multiple intervals on DV fields
> ---------------------------------------------------
>
> Key: SOLR-6216
> URL: https://issues.apache.org/jira/browse/SOLR-6216
> Project: Solr
> Issue Type: Improvement
> Reporter: Tomás Fernández Löbbe
> Assignee: Erick Erickson
> Attachments: SOLR-6216.patch, SOLR-6216.patch, SOLR-6216.patch,
> SOLR-6216.patch, SOLR-6216.patch, SOLR-6216.patch, SOLR-6216.patch,
> SOLR-6216.patch, SOLR-6216.patch, SOLR-6216.patch
>
>
> There are two ways to have faceting on values ranges in Solr right now:
> “Range Faceting” and “Query Faceting” (doing range queries). They both end up
> doing something similar:
> {code:java}
> searcher.numDocs(rangeQ , docs)
> {code}
> The good thing about this implementation is that it can benefit from caching.
> The bad thing is that it may be slow with cold caches, and that there will be
> a query for each of the ranges.
> A different implementation would be one that works similar to regular field
> faceting, using doc values and validating ranges for each value of the
> matching documents. This implementation would sometimes be faster than Range
> Faceting / Query Faceting, specially on cases where caches are not very
> effective, like on a high update rate, or where ranges change frequently.
> Functionally, the result should be exactly the same as the one obtained by
> doing a facet query for every interval
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