Re: alter column type from boolean to char with default

Rod Taylor <pg(at)rbt(dot)ca> writes:
> On Wed, 2006-08-02 at 09:19 -0400, Tom Lane wrote:
>> Hmm ... the way I would have expected to work is
>>
>> alter table posts
>> alter column deleted drop default,
>> alter column deleted type char(1)
>> using (case when deleted then 't' else 'f' end),
>> alter column deleted set default 'f';

> Perhaps it is easiest to allow the user to specify the new default after
> USING?

He already did --- I don't want to add some random new syntax for this.

Maybe we could hack things so that if both an ALTER TYPE and a SET
DEFAULT operation are present, we implicitly add a DROP DEFAULT at the
start. But leave the timing of any explicitly specified DROP DEFAULT
as-is.

regards, tom lane