(PECL solr >= 0.9.2)
SolrQuery::setFacetMissing — Maps to facet.missing
Used to indicate that in addition to the Term-based constraints of a facet field, a count of all matching results which have no value for the field should be computed
flag
TRUE
turns this feature on. FALSE
disables it.
field_override
The name of the field.
Returns the current SolrQuery object, if the return value is used.