On Wed, Apr 1, 2015 at 7:26 AM, Rémi Cura <remi(dot)cura(at)gmail(dot)com> wrote:
> pcpatch(n) are specialization of pcpatch type.
>
While this may be true PostgreSQL doesn't understand "specialization" of
data types. If you cannot do as Steven suggested you do not get to
leverage inheritance directly and will need to devise your own work-arounds
for the capabilities that you require.
I'm somewhat surprised that what you describe works at all - mainly given
that functions do not allow typemod specifications to pass through the
function invocation...but alas I'm not all that familiar with PostGIS and
whatever is being done does indeed seem to be working...
David J.