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https://issues.apache.org/jira/browse/SOLR-6216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14067363#comment-14067363
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Erick Erickson commented on SOLR-6216:
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Tomas:
Sorry I haven't been able to get to this, but I started looking at it today.
Very nice patch! I uploaded a few tweaks in a bit (spelling corrections, and I
thought that FacetComponent.countFacets was getting a little long so I
refactored the three clauses into their own methods, no functional change at
all).
A few questions though:
1> I'm assuming this supports the f.<fieldname>.facet syntax, that's at a
higher level that this patch I'd guess
2> There's a TODO in SimpleFacets [1410] or so....
3> Perhaps the most substantive question I have is the syntax. Why use '()' for
exclusive ranges and not '{}' like range facets do? Other things being equal,
it seems like this would be more consistent with other Solr syntax.
> 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
>
>
> 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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