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https://issues.apache.org/jira/browse/SOLR-17477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17886947#comment-17886947
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Tim Owen commented on SOLR-17477:
---------------------------------
The way I connect this into Solr is firstly changing my solrconfig.xml to
declare the custom ValueSourceParser class
{{<valueSourceParser name="agg_myagg"
class="com.mycompany.solr.MyAggValueSourceParser" />}}
And that class contains a static initialiser which registers itself with the
code change I made to FacetParser:
{{public class MyAggValueSourceParser extends ValueSourceParser {}}
{{ static {}}
{{ FacetParser.ParseHandler handler = (p, k, a) -> parseStructure(a);}}
{{ FacetParser.registerParseHandler("myagg", handler);}}
{{ }}}
{{ @Override}}
{{ public ValueSource parse(FunctionQParser fp) throws SyntaxError { ...}}
{{{} public static AggValueSource parseStructure(Object arg){}}}{{{}{ ...
{}}}{{}}
> Allow plugin code to define custom aggregates
> ---------------------------------------------
>
> Key: SOLR-17477
> URL: https://issues.apache.org/jira/browse/SOLR-17477
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module, Plugin system
> Reporter: Tim Owen
> Priority: Major
>
> Continuing the work done in SOLR-8673 and also addressing a TODO in the code,
> I've worked on making it easier for custom plugin code to define aggregates
> to be used in Json Faceting.
> Currently you can mostly define a custom ValueSourceParser and AggValueSource
> in plugin code (i.e. outside of the {{org.apache.solr.search.facet}} package)
> but there are still some classes and fields that are not public or protected
> which make it hard to write a sortable aggregate or use some of the useful
> built-in SlotAcc implementations.
> Another current limitation is that you can only call a custom aggregate by
> using the simple functional style syntax e.g.
> {{"mycalc":"myagg(somefield,2)"}} and not the json structured style e.g. it
> would be good to be able to support "mycalc":{ type:myagg, f:somefield,
> limit:2 }
> instead. There is a TODO in the code to support the registration of these
> types.
> PR addresses these and has been tested using a custom plugin to check it all
> works together. This allowed us to move a lot of our custom code out of our
> local Solr build and into a plugin.
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