title: How to use superset's mapbox view when longitude and latitude are in postgis point format?
body: <p>I am trying to make an apache superset chart with map box view.
  I have to set latitude and longitude columns. But these data are in a postgresql + postgis database. So, latitude and longitude are in the same column location. An sql query would be like this:</p>
  
  <p><code>SELECT ST_X(location), ST_Y(location) FROM Address</code></p>
  
  <p>How can I make superset get latitude with the function <code>ST_X()</code>?</p>