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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Created: (SOLR-1622) Add aggregate Math capabilities to Solr above and beyond the StatsComponent
Date Fri, 04 Dec 2009 16:44:20 GMT
Add aggregate Math capabilities to Solr above and beyond the StatsComponent
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                 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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