Using multiple facet.prefix on same field with facet.threads

[Kenneth Yung]

Hi all:
I'm using solr 4.7 and my application uses local param syntax to specify 
different facet.prefix on the same field.  It works fine without the 
facet.threads parameter, but if I specify facets.threads then all the facet 
count results have the same prefix even though I specify different prefixes for 
each facet (on the same field).
Just wondering if there is a way to use facets.threads for the case if multiple 
facets are specified on the same field but with different prefixes?
Thanks!
Ken