title: primefaces global filter without the column filters
body: <p>I'm working on the example mentioned in primefaces <a href="http://www.primefaces.org/showcase/ui/data/datatable/filter.xhtml" rel="nofollow noreferrer">showcase</a>. I am trying to create a global filter for the datatable.<br/>
  Currently the table looks like this:
  <img src="https://i.stack.imgur.com/fdP7M.jpg" alt="enter image description here"></p>
  
  <p>What I want to do is remove the individual column filters and have only the global filter.
  Like this:
  <img src="https://i.stack.imgur.com/zWOgG.jpg" alt="enter image description here"><br/>
  To do that I remove the <code>filterBy</code> attribute on the column definitions. But on doing that, I get a javascript warning - <code>Error in parsing value for</code>filter<code>, declaration dropped</code> and the global filter doesn't work.
  <br/>Could someone please tell me how to achieve this?</p>