Tim Owen created SOLR-17477:
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Summary: 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
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 SolrAcc 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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