title: Sphinx Filters - Can I have an 'OR' between filters attributes?
body: <p>I'm using sphinx to list me some items from my database here.
  It's almost 100%, I just haven't figured out yet how to create an <code>OR</code> between two different filters. For example:</p>
  
  <p>My Object in the database has a starting and an ending date, I can <code>filter(starting_date, x, y)</code> and <code>filter(ending_date,x,y)</code>, but both filters will have to return true to bring me the object, how can I say to sphinx filter this attribute, or that one?</p>