ALTER TABLE ... ALTER COLUMN ... DROP EXPRESSION
Add an ALTER TABLE subcommand for dropping the generated property from
a column, per SQL standard.
Reviewed-by: Sergei Kornilov <sk@zsrv.org>
Discussion: https://www.postgresql.org/message-id/flat/
2f7f1d9c-946e-0453-d841-
4f38eb9d69b6%402ndquadrant.com