On 30th of July, Andrew Dunstan committed patch: Add IF NOT EXISTS processing to ALTER TABLE ADD COLUMN Fabrízio de Royes Mello, reviewed by Payal Singh, Alvaro Herrera and Michael Paquier.

One of the most common questions is "how do I get select * from table, but without one of the column". Short answer is of course - name your columns, instead of using *. Or use a view. But I decided to ...

On 205h of July Andrew Dunstan committed patch by Andres Freund : Log Message: ----------- DROP IF EXISTS for columns and constraints. Andres Freund.