title: dynamodb - scan items by value inside array
body: <p>I'm doing a table scan. This table has an array as one of its fields, the "apps" field (apps is not a key of any kind). I want to select all rows, whose apps array contains a certain value "MyApp". I tried something of that kind, but my syntax is incorrect:</p>
  
  <pre><code>    ComparisonOperator = "#apps CONTAINS :v",
      ExpressionAttributeNames = {
          '#apps': 'apps'
      },
      ExpressionAttributeValues = {
          ":v": "MyApp"
      }
  </code></pre>
  
  <p>Thanks.</p>