Table comments are "ignored"

When a `CREATE TABLE` DDL contains a `COMMENT` clause the comment ends up being dropped and is not visible in the information schema, as exemplified here:

```sql
create table foo(x int) comment 'foo table'
;
select table_comment
from information_schema.tables
where table_name = 'foo'
;
```

This appears to work fine for table comments, but I didn't check other object types.