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From "Ryan McKinley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1622) Add aggregate Math capabilities to Solr above and beyond the StatsComponent
Date Wed, 20 Oct 2010 19:52:22 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923130#action_12923130
] 

Ryan McKinley commented on SOLR-1622:
-------------------------------------

bq. 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

FYI, this now exists in trunk -- see: LUCENE-2649

> 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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