On Tue, Sep 10, 2013 at 12:48:08PM -0700, Kevin Grittner wrote:
> Bruce Momjian <bruce@momjian.us> wrote:
>
> > FYI, I think these queries below prove that NOT NULL constraints do not
> > follow the single-depth ROW NULL inspection rule that PL/pgSQL follows,
> > and that my patch was trying to promote for queries:
> >
> > CREATE TABLE test2(x test NOT NULL);
> > CREATE TABLE
> > INSERT INTO test2 VALUES (null);
> > ERROR: null value in column "x" violates not-null constraint
> > DETAIL: Failing row contains (null).
> > --> INSERT INTO test2 VALUES (row(null));
> > INSERT 0 1
>
> If I remember correctly, the standard wants a NOT NULL constraint
> on a column with a composite type to behave the same as
>
> CHECK (col IS DISTINCT FROM NULL)
>
> ... which is consistent with the behavior you show.
Is IS DISTINCT FROM correct though?
SELECT ROW(NULL) IS DISTINCT FROM NULL; ?column?---------- t(1 row)
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ It's impossible for everything to be true. +