Re: cataloguing NOT NULL constraints

Excerpts from Kevin Grittner's message of jue ago 02 10:48:02 -0400 2012:
> 
> "Kevin Grittner" <Kevin.Grittner@wicourts.gov> wrote:
>  
> > Don't forget the peculiarities of columns with record types. 
>  
> I forgot to include the type creation in the example:
>  
> test=# create type a as (a1 int, a2 int);
> CREATE TYPE

Thanks for the example.  After playing with this, I think that a NOT
NULL constraint attached to a column with a composite type is equivalent
to a CHECK (col IS DISTINCT FROM NULL); at least they seem to behave
identically.  Is that what you would expect?

This seems a bit complicated to handle with the way I'm doing things
today; at parse analysis time, when my current code is creating the
check constraint, we don't know anything about the type of the column
IIRC.  Maybe I will have to delay creating the constraint until
execution.

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services