title: Row timestamps in Bigtable - when are they updated?
body: <p>The definition of <code>TimestampRangeFilter</code> from <a href="https://github.com/GoogleCloudPlatform/google-cloud-go/blob/46a19d54380f7a69bc14cfc011b6e7e03e6de86e/bigtable/filter.go" rel="nofollow noreferrer">Bigtable's Go API</a> is:</p>
  
  <blockquote>
    <p>TimestampRangeFilter returns a filter that matches any rows whose timestamp is within the given time bounds.</p>
  </blockquote>
  
  <p>Is the row timestamp updated when:</p>
  
  <ul>
  <li>Any column value is written/changed within that row?</li>
  <li>The row key is updated?</li>
  <li>The row is created?</li>
  <li>Any other circumstances?</li>
  </ul>