title: Failed to parse input string datetime in BQ MySQL
body: <p>I have a datetime column in my table, the values look like this:</p>
  <pre><code>datetime
  2009/03/04 11:06:29
  2009/06/05 09:22:13
  2009/07/05 09:24:43
  </code></pre>
  <p>The desired output is:</p>
  <pre><code>datetime
  2009-03-04 
  2009-06-05 
  2009-07-05 
  </code></pre>
  <p>I have tried the following:</p>
  <pre><code>PARSE_DATETIME('%m/%d/%Y', datetime) AS datetime
  </code></pre>
  <p>It gave me an error: <code>Failed to parse input string 2009/03/04 11:06:29</code></p>