title: OR condition in filter expression for dynamo db
body: <p>I have a use case where I need to query dynamo db programatically using dynamo db query expression. 
  e.x suppose there is two attributes for the A and B and I want a filter expression like <code>(A='Test' OR A ='Test1') and B='test2'</code>. </p>
  
  <p>I searched related to this but din't find useful resource.
  I am new to dynamo db. </p>