title: Two counts in just one SOLR query
body: <p>My question is: How could I realize two counts in just one SOLR query? I have tried something like this:</p>
  
  <pre><code>q=query&amp;field:[* TO *],-field:[* TO *]&amp;start=0&amp;rows=0&amp;facet=true&amp;facet.missing=true
  </code></pre>
  
  <p>i.e. I am trying to count null records and not null records for the same field.</p>
  
  <p>No error reported but no result retrieved.</p>