title: How to trigger the lambda function only for INSERT event in dynamodb stream?
body: <p>How to trigger the lambda function only for <code>INSERT</code> event in dynamodb stream?</p>
  <p>To reduce the cost of the lambda function, is it possible to trigger the lambda function based on the type of operation</p>
  <ol>
  <li>INSERT - insert_lambda_function</li>
  <li>MODIFY - update_lambda_function</li>
  <li>REMOVE - delete_lambda_function</li>
  </ol>