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https://issues.apache.org/jira/browse/SOLR-5045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712548#comment-13712548
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Jack Krupansky commented on SOLR-5045:
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One interesting test case: There has been some interest in adding "median" to
the stats component. The difficulty is that you need to build up the frequency
distribution so that you can find the value that is >= half of the values,
which is a lot more effort than simply adding values to an accumulator.
> 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:
> <lst name="aggregates">
> {<lst name="mysum">}
> <long name="sum">85</long>
> </lst>
> </lst
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