title: Joining multiple parameters in a Solr filter query
body: <p>When doing a filter query in SOLR, what is the difference between these</p>
  
  <pre><code>1. fq=+gallery_type:0^100 +content_length:14
  </code></pre>
  
  <p>and</p>
  
  <pre><code>2. fq=(gallery_type:0^100 AND content_length:14)
  </code></pre>
  
  <p>The filter for content_length (which I'm using for debugging purposes, I have a different filter I want to add) only gets applied on the second version, but from what i see here <a href="http://wiki.apache.org/solr/CommonQueryParameters#fq" rel="nofollow">http://wiki.apache.org/solr/CommonQueryParameters#fq</a> the first version should be used for multiple conditions.</p>
  
  <p>I basically want to add an extra filter to existing filters that are currently joined with "+"</p>
  
  <p>Thanks</p>