title: RethinkDB: .get() with just part of the uuid?
body: <p>Let's say this is the uuid of one of my documents in RethinkDB: <code>594a64ab-b78b-4838-a79f-318020a352a9</code></p>
  
  <p>Normally, to retrieve the document, I do: </p>
  
  <p><code>r.db("databasename").table("tablename").get('594a64ab-b78b-4838-a79f-318020a352a9')</code></p>
  
  <p>Is there some way I can achieve the same thing with only some prefixing portion of the uuid? e.g. I want to do this:</p>
  
  <p><code>r.db("databasename").table("tablename").getByPrefix('594a64ab-b78b')</code> </p>
  
  <p>Is this possible?</p>