set default
drop default
set not null
drop not null
set data type
drop column
add constraint
drop constraint
fix bug where generated didn't have to be followed with 'always' or
'by default' for identities in create table
parser and pretty printer for statements
add query statement
add support for
insert
update
delete
truncate
bonus ddl:
limited create schema
drop schema
add grammar notes to the new test files