Re: [HACKERS] generated columns

On 30/10/2018 16:14, Sergei Kornilov wrote:
> Hi
> 
> I applied this patch on top 2fe42baf7c1ad96b5f9eb898161e258315298351 commit and found a bug while adding STORED
column:
> 
> postgres=# create table test(i int);
> CREATE TABLE
> postgres=# insert into test values (1),(2);
> INSERT 0 2
> postgres=# alter table test add column gen_stored integer GENERATED ALWAYS AS ((i * 2)) STORED;
> ALTER TABLE
> postgres=# alter table test add column gen_virt integer GENERATED ALWAYS AS ((i * 2));
> ALTER TABLE
> postgres=# table test;
>  i | gen_stored | gen_virt 
> ---+------------+----------
>  1 |            |        2
>  2 |            |        4
> 
> Virtual columns was calculated on table read and its ok, but stored column does not update table data.

This is a small bug that I will fix in my next update.

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