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https://issues.apache.org/jira/browse/SOLR-5045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712566#comment-13712566
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Joel Bernstein commented on SOLR-5045:
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You have the flexibility to calculate median, atleast on a single server. Not
sure what the best approach to this would be. Distributed median may be harder.
You'd have to build up distributions in a way that can be merged.
Scripting is a very cool thing. I need to do some research though on SOLR-5005
and see if can be applied.
> Pluggable Analytics
> -------------------
>
> Key: SOLR-5045
> URL: https://issues.apache.org/jira/browse/SOLR-5045
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 5.0
> Reporter: Joel Bernstein
> Priority: Minor
> Fix For: 5.0
>
> Attachments: SOLR-5045.patch, SOLR-5045.patch
>
>
> This ticket provides a pluggable aggregation framework through the
> introduction of a new *Aggregator* interface and a new search component
> called the *AggregatorComponent*.
> The *Aggregator* interface extends the PostFilter interface providing methods
> that allow DelegatingCollectors to perform aggregation at collect time.
> Aggregators were designed to play nicely with the CollapsingQParserPlugin
> introduced in SOLR-5027.
> The *AggregatorComponent* manages the output and distributed merging of
> aggregate results.
> This ticket is an alternate design to SOLR-4465 which had the same basic idea
> but a very different implementation. This implementation resolves the caching
> issues in SOLR-4465 and combined with SOLR-5027 plays nicely with field
> collapsing. It is also much less intrusive on the core code as it's entirely
> implemented with plugins.
> Initial Syntax for the sample SumQParserPlugin Aggregator:
> ../select?q=\*:\*&wt=xml&indent=true&fq=\{!sum field=popularity
> id=mysum\}&aggregate=true
> *fq=\{!sum field=popularity id=mysum\}* - Calls the SumQParserPlugin telling
> it to sum the field popularity.
> *aggregate=true* - turns on the AggregatorComponent
> The output contains a block that looks like this:
> {code:xml}
> <lst name="aggregates">
> <lst name="mysum">
> <long name="sum">85</long>
> </lst>
> </lst>
> {code}
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