(PECL solr >= 0.9.2)
SolrQuery::setFacetSort — Determines the ordering of the facet field constraints
Determines the ordering of the facet field constraints
Use SolrQuery::FACET_SORT_INDEX for sorting by index order or SolrQuery::FACET_SORT_COUNT for sorting by count.
The name of the field.
Returns the current SolrQuery object, if the return value is used.