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https://issues.apache.org/jira/browse/SOLR-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852810#action_12852810
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Grant Ingersoll commented on SOLR-1622:
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Some notes from IRC:
-cool - if you go into the stats stuff, dump the silly string based numerics
(that we had to do in the past) and also make it per-segment
- we need one capability in the lucene FieldCache, and we could dump the legacy
"SortedInt" stuff for good
-that's simply the ability to tell of a document had a value or not
> Add aggregate Math capabilities to Solr above and beyond the StatsComponent
> ---------------------------------------------------------------------------
>
> Key: SOLR-1622
> URL: https://issues.apache.org/jira/browse/SOLR-1622
> Project: Solr
> Issue Type: New Feature
> Components: search
> Reporter: Grant Ingersoll
> Priority: Minor
>
> It would be really cool if we could have a QueryComponent that enabled doing
> aggregating calculations on search results similar to what the StatsComponent
> does, but in a more generic way.
> I also think it makes sense to reuse some of the function query capabilities
> (like the parser, etc.).
> I imagine the interface might look like:
> {code}
> math=true&func=recip(sum(A))
> {code}
> This would calculate the reciprocal of the sum of the values in the field A.
> Then, you could do go across fields, too
> {code}
> math=true&func=recip(sum(A, B, C))
> {code}
> Which would sum the values across fields A, B and C.
> It is important to make the functions pluggable and reusable. Might be also
> nice to see if we can share the core calculations between function queries
> and this capability such that if someone adds a new aggregating function, it
> can also be used as a new Function query.
> Of course, we'd want plugin functions, too, so that people can plugin their
> own functions. After this is implemented, I think StatsComponent becomes a
> derivative of the new MathComponent.
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