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(PECL solr >= 0.9.2)
SolrQuery::setFacetMissing — Maps to facet.missing
$flag 
   [,  string $field_override 
  ] )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.