Re: [HACKERS] generated columns

Hi

po 18. 3. 2019 v 8:35 odesílatel Peter Eisentraut <
peter(dot)eisentraut(at)2ndquadrant(dot)com> napsal:

> Here is an updated patch with just the "stored" functionality, as
> discussed.
>
> The actual functionality is much smaller now, contained in the executor.
> Everything else is mostly DDL support, trigger handling, and some
> frontend stuff.
>

probably I found a bug

create table foo(id int, name text);
insert into foo values(1, 'aaa');
alter table foo add column name_upper text generated always as
(upper(name)) stored;
update foo set name = 'bbb' where id = 1; -- ok

alter table foo drop column name_upper;
update foo set name = 'bbbx' where id = 1; -- ok

alter table foo add column name_upper text generated always as
(upper(name)) stored;
update foo set name = 'bbbxx' where id = 1; -- error

postgres=# update foo set name = 'bbbxx' where id = 1; -- error
ERROR: no generation expression found for column number 3 of table "foo"

Regards

Pavel

> --
> Peter Eisentraut http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
>