title: How to define current timestamp in yaml with doctrine?
body: <p>I tried the following yaml code: </p>
  
  <pre><code>columns:
    created_time:
      type: timestamp
      notnull: true
      default: default CURRENT_TIMESTAMP
  </code></pre>
  
  <p>In the outputted sql statement, the field is treated as datetime instead of timestamp, which I cannot define the current timestamp in it...</p>
  
  <p>If I insist to use timestamp to store current time, how to do so in yaml?</p>