title: DynamoDB nested attribute querying support
body: <p>Does Amazon DynamoDB scan operation allow you to query on nested attributes of type <code>Array</code> or <code>Object</code>? For example,</p>
  <pre class="lang-json prettyprint-override"><code>{
      Id: 206,
      Title: &quot;20-Bicycle 206&quot;,
      Description: &quot;206 description&quot;,
      RelatedItems: [
          341, 
          472, 
          649
      ],
      Pictures: {
          FrontView: &quot;123&quot;, 
          RearView: &quot;456&quot;,
          SideView: &quot;789&quot;
      }
  }
  </code></pre>
  <p>Can I query on <code>RelatedItems[2]</code> or <code>Pictures.RearView</code> attributes?</p>