Feature Request: generated/virtual/calculated columns

Different databases call them slightly different things, but I’m looking for support for generated columns as introduced in SQL:2003.

Sample SQL:

CREATE TABLE S (
 COL1 INTEGER,
 COL2 INTEGER,
 COL3 GENERATED ALWAYS AS (COL1 + COL2) )

Further reference:
https://en.wikipedia.org/wiki/Virtual_column