(PECL solr >= 0.9.2)
SolrQuery::getFacetSort — Returns the facet sort type
Returns an integer (SolrQuery::FACET_SORT_INDEX or SolrQuery::FACET_SORT_COUNT)
field_override
The name of the field
Returns an integer (SolrQuery::FACET_SORT_INDEX or SolrQuery::FACET_SORT_COUNT) on success or null
if not set.