In trying to implement http://wiki.apache.org/solr/HierarchicalFaceting I found the need to send multiple prefix facets in the same request on the same field.
Currently facet params will parse the localParams, but only use them to pick out a name. We can easily modify things to let localParams override global ones. For example:
This can easily be supported if we use:
when local params exist
We have come a long way from simple facets!