there is a table with virtual column in snowflake like:

```
create table my_tbl(
  key       number, 
  name      varchar(60), 
  owner     varchar(60),
  value     number, 
  check_sum number as hash(key, name, value)
);

```

Could you please advise whether this column is modified with alter statement?

I tried smth like

```
alter table my_tbl modify column check_sum number as hash(key, name, value, owner)

```

but it doesn't work