Re: Virtual generated columns

create table t (a int, b int);
create table vt (a int, b int generated always as (a * 2));

insert into t values (1, 1);
insert into vt values (1);

# select 1 from t t1 where exists   (select 1 from vt where exists    (select t1.a from t t2 where vt.b = 2));
ERROR:  unexpected virtual generated column reference

I've discovered yet another way to trigger that error:
create table vt (a int, b int generated always as (a * 2), c int);
insert into vt values(1);
alter table vt alter column c type bigint using b + c;

ERROR:  XX000: unexpected virtual generated column reference
LOCATION:  CheckVarSlotCompatibility, execExprInterp.c:2410

Shouldn't this be expected/supported?

Best regards,
Alexander Lakhin
Neon (https://neon.tech)