title: Postgresql set default boolean to null with yes/no
body: <p>In Postgresql 11 when I run the following the result is a true/false option for the column when I view this in dbeaver. Is it possible to specify a boolean column with default value null using yes/no? </p>
  
  <pre class="lang-sql prettyprint-override"><code>ALTER TABLE buildings
      ADD COLUMN IF NOT EXISTS ownership_historic boolean DEFAULT null;
  </code></pre>
  
  <p>Clarification to yes/no, as below on dbeaver the column input value is showing as a true false option whereas I want a yes/no option. This might be a dbeaver display preference?</p>
  
  <p><a href="https://i.stack.imgur.com/xVkSv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xVkSv.png" alt="enter image description here"></a></p>