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.

regards, Sergei

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