title: Impala Data types
body: <p>I'm trying to understand the difference between the following data tyoes in Impala</p>
  
  <ol>
  <li>String</li>
  <li>Char</li>
  <li>Varchar</li>
  </ol>
  
  <p>Being schema on read what would be the need for 3 different types. I am wondering if there's any performance benefits of using Char/Varchars over Strings in scenarios where we know the upper bounds on column lengths?</p>