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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1581) Facet by Function
Date Thu, 17 Feb 2011 16:58:30 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12995915#comment-12995915
] 

Grant Ingersoll commented on SOLR-1581:
---------------------------------------

I've been digging into this a bit more and I've got an idea that I want to throw out there
about this and how it relates to Numeric Range faceting (and possibly date faceting)

Currently, the numeric range faceting produces a series of range queries from which it retrieves
the number of documents that satisfy that query.  For facet by function, I'm thinking that
I would parse the facet.range value and get back a ValueSource, from which I would get the
DocValues and then I would iterate over the DocValues for the base docset and keep counts
for each bucket.  It then occurred to me that wouldn't this be a faster way then doing the
range queries (at the cost of it being a ValueSource and thus in memory) for each gap?  Otherwise,
what I will do is simply put in an if/else clause, if it is a function do the ValueSource,
otherwise do the current way.

> Facet by Function
> -----------------
>
>                 Key: SOLR-1581
>                 URL: https://issues.apache.org/jira/browse/SOLR-1581
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Grant Ingersoll
>             Fix For: Next
>
>
> It would be really great if we could execute a function and quantize it into buckets
that could then be returned as facets.

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