[GENERAL] Functions and Parentheses - Mailing list pgsql-general

Hi,

Is current_date a function?  It's a bit puzzling to me since there are no parentheses after it, i.e.

  SELECT current_date;

And not

  SELECT current_date();  -- syntax error

How come `current_date` has no parenthesis but `clock_timestamp()` does?

Thanks,